阅读说明：本技术 聚合物纤维 (Polymer fiber ) 是由 刘鹏 范志恒 吉宫隆之 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种聚合物纤维,该纤维中含有球形粒子,所述球形粒子任意两个面正投影圆的直径的比值为0.90～1.10,同一粒径的球形粒子占总体球形粒子的50%以上。该聚合物纤维的白度高,同时纤维的摩擦系数明显降低,纤维的滑爽感提高,此外纤维的光扩散效果好、光泽优异。该聚合物纤维不仅能作服用纤维,也可应用于产业用的窗帘布等方面。(The invention discloses a polymer fiber, which contains spherical particles, wherein the ratio of the diameters of orthographic projection circles of any two surfaces of the spherical particles is 0.90-1.10, and the spherical particles with the same particle size account for more than 50% of the total spherical particles. The polymer fiber has high whiteness, obviously reduced friction coefficient, improved smooth feeling, good light diffusion effect and excellent luster. The polymer fiber can be used as clothing fiber and can also be applied to the aspects of industrial curtain cloth and the like.)

1. A polymer fiber characterized by: the fiber contains spherical particles, the ratio of the diameters of orthographic projection circles of any two surfaces of the spherical particles is 0.90-1.10, and the spherical particles with the same particle size account for more than 50% of the total spherical particles.

2. The polymer fiber of claim 1, wherein: the spherical particles are one of polysiloxane, polymethacrylate, polyacrylic acid, polystyrene, silicon dioxide, barium sulfate and calcium carbonate.

3. The polymer fiber according to claim 1 or 2, characterized in that: the content of the spherical particles in the fiber is 0.1 to 20.0 wt%.

4. The polymer fiber according to claim 1 or 2, characterized in that: the spherical particles have a particle diameter of 0.1 to 10.0 μm.

5. The polymer fiber according to claim 1 or 2, characterized in that: the absolute value of the difference between the refractive index of the polymer fiber and that of the spherical particles is 0.5 or less.

6. The polymer fiber according to claim 1 or 2, characterized in that: the fiber has a CIE whiteness value of 75 or more, a CIE yellowness value of 2.0 or less, and an L value of 90 or more.

7. The polymer fiber according to claim 1 or 2, characterized in that: the coefficient of friction between the fibers is below 0.20.

8. The polymer fiber according to claim 1 or 2, characterized in that: the fiber has a total light transmittance of 80% or more and a haze of 80% or more.

Technical Field

The present invention relates to a polymer fiber, and more particularly, to a polymer fiber containing spherical particles.

Background

Functional fiber is a product with high added value, which has important significance in improving the comfort of clothes and endowing special functions, and also has excellent performance in the aspect of non-taking, so that various methods for endowing the fiber with functions such as ultraviolet resistance, antibiosis, cool feeling, heat preservation, heat accumulation, heating, smoothness, visual color, brightness, vividness, olfactory fragrance, deodorization and the like and corresponding products appear in the technology, and in addition, the special functional fiber endowing the fiber with higher whiteness, high smoothness and light diffusion effect is also researched and developed in a large quantity.

At present, various fluorescent whitening agent materials are mainly used for improving the whiteness of the fibers (published by CN 104695044A), although the whiteness of the fibers can be greatly improved by using the fluorescent whitening agent, the fluorescent whitening agent cannot exert obvious advantages under the dark condition, so the whiteness generated by the fluorescent whitening agent is limited by certain special conditions; in addition, most of fluorescent whitening agents are organic compounds, can be combined with human proteins and are difficult to discharge through metabolism, so that the fluorescent whitening agents cause damage to the immunity of human bodies and induce canceration. While the few methods of improving the whiteness of the fiber by using a brightening agent without fluorescence (published by CN 108166243A) or adding titanium dioxide particles (published by CN 104695044A) effectively overcome the defects of the fluorescent whitening agent and endow higher whiteness, the brightening agent without fluorescence or the titanium dioxide particles usually darken the glossiness of the product and affect the visual experience of use.

Further, the fiber is imparted with a smooth feeling by lowering the friction coefficient of the fiber, thereby improving the wearing comfort. Friction reducing materials commonly used in the market include silicone oil, silicone, Ethylene Bis Stearamide (EBS), paraffin wax, Ethylene Vinyl Acetate (EVA), and the like. Japanese patent laid-open No. 2000-328460 discloses a water-based fiber treatment agent comprising silicone particles, and the coating treatment of the fibers with this treatment agent can reduce the friction coefficient of the fibers.

The light diffusion is mainly applied to film materials of products such as LEDs, LCDs and the like at present, and the film materials with the light diffusion effect are obtained by adding materials with the light diffusion effect into corresponding films, so that a point light source is changed into a surface light source, light rays are changed to be soft, and comfort is brought to people visually. Japanese patent laid-open Nos. 11-2705, 2008-209919 and 2015-197614 disclose that a resin film with a light-regulating function is prepared by using a light-diffusing material, and the application of the material with the light-diffusing effect in fibers is not clear at present.

While individual functional assignments are relatively easy to obtain, research and development of fibers having multiple functions simultaneously remains a significant challenge.

Disclosure of Invention

The invention aims to provide a polymer fiber with high whiteness, bright glossiness, smooth feeling and light diffusion effect.

The technical solution of the invention is as follows:

the polymer fiber contains spherical particles, the ratio of the diameters of orthographic projection circles of any two surfaces of the spherical particles is 0.90-1.10, and the spherical particles with the same particle size account for more than 50% of the total spherical particles.

The spherical particles are preferably one of polysiloxane, polymethacrylate, polyacrylic acid, polystyrene, silicon dioxide, barium sulfate and calcium carbonate.

The content of spherical particles in the fiber is preferably 0.1 to 20.0wt%, and the particle diameter is preferably 0.1 to 10.0 μm.

The absolute value of the difference in refractive index between the polymer fibers and the spherical particles is preferably 0.5 or less.

The fibers preferably have a CIE whiteness value of 75 or more, a CIE yellowness value of 2.0 or less, and an L value of 90 or more.

The coefficient of friction between the fibers is preferably below 0.20.

The total light transmittance of the fiber is preferably 80% or more, and the haze is preferably 80% or more.

According to the invention, the regular spherical particles with higher sphericity are added into the fiber, so that the dispersion of the particles in the polymer is improved, the problems of poor spinning performance, unobvious fiber functions and the like caused by the problems of particle agglomeration, uneven dispersion and the like are reduced, various different functions are endowed to common fibers, the whiteness of the fibers is improved, the bright and soft luster is endowed to the fibers, the friction of the fibers is reduced, the smooth hand feeling is improved, and in addition, the light diffusion effect is endowed to the fibers.

Drawings

FIG. 1 is a schematic diagram of prism refractive index measurement.

Detailed Description

The spherical particles are spherical particles or particles infinitely close to spherical particles, and particularly the ratio of the diameters of orthographic projection circles of any two surfaces is 0.90-1.10. The orthographic projection circles of any two surfaces are circles formed by orthographic projection of spherical particles on any two planes, and the ratio of the diameters of the two circles is within the range of 0.90-1.10.

The ratio is an important index for representing the sphericity of the spherical particles, and influences the refraction, scattering, diffraction and reflection of the spherical particles on light, so that the diffusion efficiency and loss of the spherical particles on the light and the light transmittance of the spherical particles are influenced. The ideal boundary of the spherical particles is a regular spherical particle with a smooth surface like a mirror surface. In order to improve the dispersion effect of the particles in the polymer, reduce broken filaments in production and enable the obtained polymer fiber to have higher whiteness, smooth feeling and excellent light diffusion effect, the ratio of the diameters of orthographic projection circles of any two surfaces of the spherical particles is preferably 0.95-1.05.

The particle size distribution of the spherical particles also has a significant influence on the function of the fiber, and the narrower the range of the particle size distribution, the more excellent the whiteness and light diffusion effect of the fiber. The spherical particles with the same particle size in the spherical particles account for more than 50 percent of the total spherical particles. The spherical particles having the same particle diameter mean all spherical particles having a deviation of 10% or less from a certain particle diameter value, which is an arbitrary value in the range of particle diameters that can be added to the fibers. In order to obtain a fiber having excellent whiteness and light diffusion effect, it is preferable that spherical particles having the same particle diameter account for 80% or more of the total spherical particles.

The spherical particles of the present invention are preferably one of polysiloxane, polymethacrylate, polyacrylic acid, polystyrene, silica, barium sulfate, and calcium carbonate, and more preferably polysiloxane or polyacrylic acid or silica.

If the content of the spherical particles in the fiber is too low, the whiteness of the fiber is not obviously improved, the gloss improvement effect is poor, meanwhile, the fiber cannot be effectively endowed with the effects of smoothness and comfort, and the full light transmittance and haze of the fiber are low; if the content of the spherical particles in the fiber is too high, the spinnability deteriorates, the strength of the fiber decreases, the probability of yarn breakage increases, and the light diffusion effect of the fiber also decreases. The content of the spherical particles in the fiber is preferably 0.1 to 20.0wt%, more preferably 0.3 to 5.0 wt%, in view of the influence of the spherical particles on the spinning effect and the function of the fiber.

If the particle size of the spherical particles is too small, the particles are not easy to uniformly disperse in the fiber, the agglomeration effect is obvious, the whiteness of the fiber is not obviously improved, the gloss improvement effect is poor, meanwhile, the fiber cannot be effectively endowed with the effects of smoothness and comfort, and the full light transmittance and haze of the fiber are low; if the particle diameter of the spherical particles is too large, the spinnability deteriorates, the probability of yarn breakage increases, the strength of the fiber decreases, and the light diffusion effect of the fiber also decreases. According to the invention, the particle size of the spherical particles is preferably 0.1-10.0 μm, the spherical particles in the particle size range have high fluidity in the fiber, the particles are basically not agglomerated, the spherical particles are uniformly dispersed in the fiber, the spinning property is good, the whiteness of the fiber is obviously improved, and the soft and bright glossiness, the smooth effect and the excellent light diffusion effect are obtained. The particle diameter of the spherical particles is more preferably 0.5 to 5.0 μm, most preferably 1.0 to 3.0. mu.m.

The presence of non-uniform masses in a substance scatters light entering the substance away from the direction of incidence, and, like light absorption, the scattering of light also reduces the intensity of light passing through the substance. The transmission and scattering must be balanced based on practical requirements, and the scattering of light must be controlled within a reasonable range, so there are certain requirements and limitations on the refractive index of the non-uniform component, i.e. spherical particles, in the continuous medium. The refractive index is not only small but also not too different from the continuous phase medium (i.e., matrix transparent resin). The larger the refractive index difference is, the stronger the scattering effect is, and the larger the difference between the refractive indexes of the continuous phase substrate and the heterogeneous phase particles is, the total reflection occurs, and the light is reflected back to the inside and cannot be effectively guided out. In order to obtain an excellent light diffusion effect, the absolute value of the difference in refractive index between the polymer fibers and the spherical particles is preferably 0.5 or less, and more preferably 0.2 or less.

In the present invention, both polymers suitable for melt spinning and solution spinning can be applied for production. For example, polymers suitable for melt spinning include polyethylene terephthalate fibers (PET), polytrimethylene terephthalate fibers (PPT), polybutylene terephthalate fibers (PBT), polyamide-6 fibers (PA 6), polyamide-66 fibers (PA 66), polyamide-610 fibers (PA 610), polypropylene fibers (PP), polyethylene fibers (PE), and the like; polyacrylonitrile fibers (PAN), acetate fibers, polyvinyl formal fibers (PVA), polyvinyl chloride fibers (PVA), polyurethane fibers (PU), polylactic acid fibers (PLA), polyvinyl pyrrolidone fibers (PVP), and the like, which are suitable for solution spinning.

The coefficient of friction between the fibers is preferably 0.20 or less, and if the coefficient of friction between the fibers is too large, the fibers are less likely to slip, the processability is deteriorated, the hand feeling of the product is rough, and the softness, the drapability and the like are deteriorated, and the wearing comfort is deteriorated.

The polymer fiber of the present invention can be prepared by a known method, for example, a series of processes of melting, extruding, cooling, drawing, and winding a chip of a high molecular polymer containing spherical particles to obtain a filament fiber; the diameter of the filament fiber is 5.0-150.0 μm.

The polymer fiber can also be short fiber, and the specific preparation method can be that the short fiber is obtained by a series of processing technologies of melting, extruding, cooling, stretching, shaping, curling, cutting and packing the slices of the high molecular polymer containing spherical particles; the short fiber has a length of 1.0-200.0 mm and a diameter of 5.0-150.0 μm.

According to the invention, the polymer has high whiteness by adding the spherical particles with high sphericity and concentrated particle size into the polymer fiber, the CIE whiteness value can reach more than 75, the CIE yellowness value is less than 2.0, and the L value is more than 90. And the high whiteness effect of the fiber can be maintained under the condition of no ultraviolet light. Meanwhile, the polymer fiber has good light diffusion effect, the transmittance of the full fiber is more than 80%, and the haze is more than 80%. Moreover, the spherical particles can also reduce the friction coefficient of the fibers and improve the smooth hand feeling.

The invention relates to a parameter testing method which comprises the following steps:

(1) diameter of spherical particle orthographic projection circle

Observing spherical particles through a light field microscope, putting a single spherical particle under a light source to obtain an orthographic projection circle of the particle, measuring the area of the orthographic projection circle by using a related scale tool in the microscope, calculating according to an equivalent method of the diameter of a certain circle which is equal to the area of the orthographic projection circle of the spherical particle to obtain the diameter of the orthographic projection circle of the spherical particle,

d: the diameter of a circle; a: spherical particles orthographically project the area of a circle.

(2) Spherical particle size and distribution thereof

The spherical particles were observed by a microscope and measured by measuring diameters of individual particles in different directions using an associated scale tool in the microscope, and the average value obtained by 10 measurements was used to represent the particle diameter of the spherical particles,

d: the particle size of the spherical particles; ai: the test diameter of the ith particle; i: the number of measurements was determined.

The particle size distribution is determined by sieving, i.e. the spherical particles are poured into the uppermost sieve of a series of selected sieves, and the particles smaller than the size of the sieve pores fall down from the pores during vibration. The total particle population can be separated into several populations of different particle sizes using a series of sieves of different mesh size. After the screening is finished, the mass of the particles on the screen and in the chassis is respectively weighed, and the particle size distribution is calculated.

(3) Content of spherical particles in fiber

The spherical particles are separated from the polymer fibers by selecting an appropriate solvent to dissolve the polymer fibers without any change of the spherical particles, and the weight of the separated spherical particles M2 is weighed against the initial weight of the fibers containing the spherical particles M1.

The content of spherical particles in the fiber was (M2/M1) × 100%.

TABLE 1 corresponding solvents for the polymers

Polymer and method of making same	Solvent(s)
		Polyester fiber (PET, PBT, PPT)	Hexafluoroisopropanol
Polyacrylonitrile fiber (PAN)	N, N-Dimethylformamide (DMF)
		Polyvinyl chloride fibre (PVC)	N, N-Dimethylformamide (DMF)
Polyurethane fiber (PU)	N, N-Dimethylformamide (DMF)
		Acetate fibre (CA)	N, N-Dimethylformamide (DMF)
Polyacrylic acid fiber (PAA)	Butanone
		Polyamide fibre (PA 6, PA 66)	Phenol-methanol mixture
Polypropylene fiber (PP)	Methylene chloride and cyclohexanone

(4) Refractive index of fiber

According to FZ/T01057.9: 2012, the refractive index of the fiber in the long axis direction is obtained by testing with a polarized light microscope and an abbe refractometer.

TABLE 2 refractive indices of the various fibers

	Axial refractive index
		Nylon fiber (PA 6, PA 66)	1.57
Terylene fiber (PET, PBT, PPT)	1.73
		Polypropylene fiber (PP)	1.53
Acrylic fiber (PAN)	1.52
		Acetate fibre (CA)	1.48
Viscose (Viscose)	1.54
		Polyethylene fiber (PE)	1.57
Polyvinyl chloride fibre (PVC)	1.55

(5) Refractive index of particle

The refractive index of the solid was measured using an Abbe refractometer from ATAGO (Aito).

The refractive index of the solid optical material is measured by a minimum deviation angle method, and the measurement accuracy of +/-5 multiplied by 10 < -6 > can be obtained.

Because of the refraction of light, a certain included angle exists between the refraction direction (c) and the incidence direction (c) of the monochromatic parallel light after passing through the triple prism (as shown in figure 1)This angle is called the deflection angle. When the incident angle is equal to the exit angle, the deflection angle has a minimum value. From the theorem of refractive index and the geometric relationship:

wherein n is,、、、Respectively, the prism refractive index, the incident angle, the refraction angle, the minimum deviation angle, and the prism apex angle. On the goniometer, the prism apex angle (mainly auto-collimation method, reflection method) and minimum deflection angle are measuredThe refractive index n can be calculated (mainly by a single-value method, a double-angle method, a complementary method and a three-image method).

TABLE 3 refractive indices of various particles

Particles	Refractive index
		Polysiloxanes	1.43
Silicon dioxide	1.54
		Barium sulfate	1.63
Calcium carbonate	1.66
		Polymethacrylate	1.49
Polyacrylic acid	1.52
		Polystyrene	1.59

(6) Color tone of fiber

According to JIS Z8722: 2009 standard for spectrocolorimetry, testing was performed using a Datacolor 650 instrument under a D65 illuminant.

(7) Coefficient of friction between fibers

The fiber-to-fiber friction coefficient test (filament speed tested 55m/min, measurement time 20 seconds) was carried out using the METER (model: IT-MS) instrument from INTEC CO. LTD.

(8) Full light transmittance of fiber

The total light transmittance (Tt) is a ratio of a light flux transmitted through a sample to a light flux incident on the sample. Calculated according to the following formula in accordance with JIS K7361-1-1997,

Tt=T2/T1×100，

t1: the flux of incident light; t2: total transmitted light flux through the sample.

(9) Haze of fiber

The haze (H) is the ratio of the scattered light flux to the transmitted light flux which are transmitted through the sample and deviated from the incident light direction. The measurement was carried out using a Datacolor 650 apparatus according to ASTM D1003-13, and the scattered luminous flux of 2.5 degrees or more from the incident light direction was used to calculate the haze,

H=(T4/T2-T3/T1)×100，

t1: the flux of incident light; t2: total transmitted light flux through the sample; t3: the scattered light flux in the instrument; t4: the scattered light flux in the instrument and sample.

(10) Spinnability

The spinning property was judged by the filtration pressure of the polymer, and the conditions of yarn breakage and yarn drift during spinning.

Filtration pressure: the amount of the added particles was 5%, the polymer flow rate per minute per unit area of the filter was 4.9g, the evaluation was O when the pressure was within 2MPa for 12 hours, Δ was measured when the pressure was 2-5MPa, and x was measured when the pressure was 5MPa or more.

Breaking the filaments: when spinning was carried out, the number of yarn breakage within 12 hours was determined as O within 3, the number of yarn breakage was determined as Δ between 3 and 10, and the number of yarn breakage was determined as X at 10 or more.

Floating monofilaments: when spinning was carried out, the number of yarn breakage within 12 hours was judged as ≈ 5 times, the number of yarn breakage was judged as Δ 5 to 10 times, and the number of yarn breakage was judged as ×.

When all three items among the pressure, the broken filaments and the floating monofilaments are judged to be O, the spinning performance is judged to be O; when all three items are judged to be X, the spinning property is judged to be X; in all cases except the cases judged as ∘ and ×, the spinnability was judged as Δ.

The present invention will be described in further detail with reference to examples.

Example 1

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 0.1 percent, the CIE whiteness value of the obtained polymer fibers is 76, the CIE yellowness value is 1.7, and the L value is 91; the fiber-to-fiber coefficient of friction is 0.20; the total light transmittance of the fiber is 85 percent, and the haze is 82 percent.

Example 2

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 80, the CIE yellowness value is 1.3, and the L value is 92; the fiber-to-fiber coefficient of friction was 0.16; the total light transmittance of the fiber was 89%, and the haze was 88%.

Example 3

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 5.0 percent, the CIE whiteness value of the obtained polymer fibers is 85, the CIE yellowness value is 1.4, and the L value is 95; the fiber-to-fiber coefficient of friction was 0.14; the total light transmittance of the fiber was 96% and the haze was 91%.

Example 4

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 10.0 percent, the CIE whiteness value of the obtained polymer fibers is 90, the CIE yellowness value is 1.5, and the L value is 97; the fiber-to-fiber coefficient of friction was 0.11; the total light transmittance of the fiber is 90%, and the haze is 94%.

Example 5

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.5 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 15.0 percent, the CIE whiteness value of the obtained polymer fibers is 94, the CIE yellowness value is 1.7, and the L value is 98; the fiber-to-fiber coefficient of friction was 0.08; the total light transmittance of the fiber was 86% and the haze was 93%.

Example 6

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 20.0 percent, the CIE whiteness value of the obtained polymer fibers is 98, the CIE yellowness value is 1.3, and the L value is 98; the friction coefficient between the fibers is 0.10; the total light transmittance of the fiber is 83 percent, and the haze is 90 percent.

Comparative example 1

Preparing a polymer fiber from polyethylene terephthalate (PET) through melt spinning, wherein the CIE whiteness value of the obtained polymer fiber is 74, the CIE yellowness value is 2.5, and the L value is 90; the fiber-to-fiber coefficient of friction was 0.21; the total light transmittance of the fiber is 66%, and the haze is 50%. Since no spherical particles are added, the whiteness of the resulting fiber is significantly reduced, the gloss becomes dazzling, the friction of the fiber is increased, the hand is rough, and the light diffusion effect is significantly deteriorated.

Comparative example 2

Adding polyethylene terephthalate (PET) and polysiloxane microspheres with the average particle size of 3.0 mu m, the proportion of particles with the same particle size of 80 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.95-1.05 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 40.0 percent, the CIE whiteness value of the obtained polymer fibers is 96, the CIE yellowness value is 1.9, and the L value is 92; the fiber-to-fiber coefficient of friction was 0.21; the total light transmittance of the fiber was 71% and the haze was 76%. Due to the excessive addition of the spherical particles, the filtration pressure rises sharply in the spinning process, broken filaments are easily generated, the strength and elongation of the obtained fiber are poor, and in addition, the light diffusion effect of the fiber is also poor.

Example 7

Adding polyamide-6 (PA 6) and polymethacrylate microspheres with the average particle size of 5.0 mu m and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polymethacrylate microspheres in the fibers is 2.0%, the proportion of the particles with the same particle size is 50%, the CIE whiteness value of the obtained polymer fibers is 83, the CIE yellowness value is 1.7, and the L value is 92; the fiber-to-fiber coefficient of friction was 0.19; the total light transmittance of the fiber is 82%, and the haze is 80%.

Example 8

Adding polyamide-6 (PA 6) and polymethacrylate microspheres with the average particle size of 5.0 mu m and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polymethacrylate microspheres in the fibers is 2.0%, the proportion of the particles with the same particle size is 70%, the CIE whiteness value of the obtained polymer fibers is 86, the CIE yellowness value is 1.8, and the L value is 92; the fiber-to-fiber coefficient of friction was 0.17; the total light transmittance of the fiber was 87% and the haze was 84%.

Example 9

Adding polyamide-6 (PA 6) and polymethacrylate microspheres with the average particle size of 5.0 mu m and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polymethacrylate microspheres in the fibers is 2.0%, the proportion of the particles with the same particle size is 90%, the CIE whiteness value of the obtained polymer fibers is 88, the CIE yellowness value is 1.6, and the L value is 95; the fiber-to-fiber coefficient of friction was 0.14; the total light transmittance of the fiber was 91% and the haze was 87%.

Comparative example 3

Adding polyamide-6 (PA 6) and polymethacrylate microspheres with the average particle size of 5.0 mu m and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polymethacrylate microspheres in the fibers is 2.0%, the proportion of the particles with the same particle size is 40%, the CIE whiteness value of the obtained polymer fibers is 78, the CIE yellowness value is 1.9, and the L value is 90; the fiber-to-fiber coefficient of friction is 0.20; the total light transmittance of the fiber is 75%, and the haze is 76%. Since the ratio of the particles having the same particle diameter among the spherical particles is low, that is, the range of the particle diameter distribution of the spherical particles is wide, the whiteness of the fiber is reduced due to dispersion irregularity, and the light diffusion effect is also deteriorated.

Example 10

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0% and the average particle size is 0.1 mu m, and the obtained polymer fibers have the CIE whiteness value of 75, the CIE yellowness value of 2.0 and the L value of 91; the fiber-to-fiber coefficient of friction is 0.20; the total light transmittance of the fiber is 80%, and the haze is 81%.

Example 11

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0% and the average particle size is 0.5 mu m, and the obtained polymer fibers have the CIE whiteness value of 82, the CIE yellowness value of 1.5 and the L value of 93; the fiber-to-fiber coefficient of friction was 0.17; the total light transmittance of the fiber is 85 percent, and the haze is 85 percent.

Example 12

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0%, the average particle size is 2.0 mu m, the CIE whiteness value of the obtained polymer fibers is 86, the CIE yellowness value is 1.6, and the L value is 94; the fiber-to-fiber coefficient of friction is 0.15; the total light transmittance of the fiber is 88 percent, and the haze is 90 percent.

Example 13

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0% and the average particle size is 5.0 mu m, and the obtained polymer fibers have the CIE whiteness value of 89, the CIE yellowness value of 1.9 and the L value of 96; the fiber-to-fiber coefficient of friction was 0.14; the total light transmittance of the fiber is 90%, and the haze is 92%.

Example 14

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0%, the average particle size is 10.0 mu m, the CIE whiteness value of the obtained polymer fibers is 92, the CIE yellowness value is 1.5, and the L value is 95; the fiber-to-fiber coefficient of friction was 0.18; the total light transmittance of the fiber is 92%, and the haze is 95%.

Comparative example 4

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0% and the average particle size is 0.01 mu m, and the obtained polymer fibers have the CIE whiteness value of 70, the CIE yellowness value of 2.6 and the L value of 87; the fiber-to-fiber coefficient of friction was 0.22; the total light transmittance of the fiber was 71% and the haze was 69%. Since the particle size of the spherical particles is too small, the particles are easily agglomerated, and refraction, reflection, and scattering of light are enhanced, and the whiteness of the fiber is reduced, and the light diffusion effect is deteriorated.

Comparative example 5

Adding polyacrylic acid microspheres with 60% of polypropylene (PP) and particles with the same particle size and 0.90-1.10% of the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the polyacrylic acid microspheres in the fibers account for 1.0%, the average particle size is 30.0 mu m, the CIE whiteness value of the obtained polymer fibers is 90, the CIE yellowness value is 2.3, and the L value is 94; the fiber-to-fiber coefficient of friction was 0.21; the total light transmittance of the fiber is 76%, and the haze is 73%. As the particle size of the spherical particles is too large, the filtration pressure in spinning is obviously increased, the probability of yarn breakage is obviously increased, and the spinning performance is obviously deteriorated.

Example 15

Adding polybutylene terephthalate (PBT) and silica microspheres with the average particle size of 1.0 mu m and the same particle size of 95 percent into a kneader for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the silica microspheres in the fibers account for 3.0 percent, the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles is 0.95-1.05, the CIE whiteness value of the obtained polymer fibers is 85, the CIE yellowness value is 1.8, and the L value is 91; the fiber-to-fiber coefficient of friction was 0.18; the total light transmittance of the fiber is 88 percent, and the haze is 80 percent.

Example 16

Adding polybutylene terephthalate (PBT) and silica microspheres with the average particle size of 1.0 mu m and the same particle size of 95 percent into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the silica microspheres in the fibers account for 3.0 percent, the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles is 0.90-1.10, the CIE whiteness value of the obtained polymer fibers is 86, the CIE yellowness value is 1.6, and the L value is 94; the fiber-to-fiber coefficient of friction was 0.16; the total light transmittance of the fiber was 93% and the haze was 84%.

Comparative example 6

Adding polybutylene terephthalate (PBT) and silica microspheres with the average particle size of 1.0 mu m and the same particle size of 95 percent into a kneader for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the silica microspheres in the fibers account for 3.0 percent, the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles is 0.60-1.67, the CIE whiteness value of the obtained polymer fibers is 80, the CIE yellowness value is 1.9, and the L value is 90; the fiber-to-fiber coefficient of friction was 0.19; the total light transmittance of the fiber was 73% and the haze was 78%. Since the sphericity of the spherical particles is low, refraction, reflection, and scattering of light are enhanced, whiteness of the fiber is reduced, glossiness is deteriorated, friction of the fiber is increased, hand feeling is deteriorated, and light diffusion effect is deteriorated.

Example 17

Adding polytrimethylene terephthalate (PPT) and polysiloxane microspheres with the average particle size of 2.0 microns, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polysiloxane microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 87, the CIE yellowness value is 1.4, and the L value is 95; the fiber-to-fiber coefficient of friction was 0.11; the total light transmittance of the fiber was 89%, and the haze was 93%.

Example 18

Adding polytrimethylene terephthalate (PPT) and polymethacrylate microspheres with the average particle size of 2.0 mu m, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polymethacrylate microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 81, the CIE yellowness value is 1.9, and the L value is 91; the fiber-to-fiber coefficient of friction was 0.19; the total light transmittance of the fiber was 87% and the haze was 84%.

Example 19

Adding polytrimethylene terephthalate (PPT) and polyacrylic acid microspheres with the average particle size of 2.0 mu m, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polyacrylic acid microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 85, the CIE yellowness value is 1.5, and the L value is 92; the fiber-to-fiber coefficient of friction is 0.20; the total light transmittance of the fiber is 90%, and the haze is 81%.

Example 20

Adding polytrimethylene terephthalate (PPT) and polystyrene microspheres with the average particle size of 2.0 microns, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the polystyrene microspheres in the fibers is 2.0 percent, and the obtained polymer fibers have the CIE whiteness value of 83, the CIE yellowness value of 1.6 and the L value of 91; the fiber-to-fiber coefficient of friction was 0.18; the total light transmittance of the fiber is 92%, and the haze is 86%.

Example 21

Adding polytrimethylene terephthalate (PPT) and silicon dioxide microspheres with the average particle size of 2.0 mu m, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the silicon dioxide microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 84, the CIE yellowness value is 1.7 and the L value is 91; the fiber-to-fiber coefficient of friction was 0.19; the total light transmittance of the fiber was 84% and the haze was 82%.

Example 22

Adding polytrimethylene terephthalate (PPT) and barium sulfate microspheres with the average particle size of 2.0 microns, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the barium sulfate microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 80, the CIE yellowness value is 1.7 and the L value is 92; the fiber-to-fiber coefficient of friction was 0.18; the total light transmittance of the fiber is 80%, and the haze is 86%.

Example 23

Adding polytrimethylene terephthalate (PPT) and calcium carbonate microspheres with the average particle size of 2.0 mu m, the proportion of particles with the same particle size of 90 percent and the ratio of the orthographic projection circular diameters of any two surfaces of spherical particles of 0.90-1.10 into a mixing machine for extrusion granulation, and preparing polymer fibers through melt spinning, wherein the proportion of the calcium carbonate microspheres in the fibers is 2.0 percent, the CIE whiteness value of the obtained polymer fibers is 83, the CIE yellowness value is 1.9, and the L value is 90; the fiber-to-fiber coefficient of friction was 0.17; the total light transmittance of the fiber was 81%, and the haze was 83%.