阅读说明：本技术 耐光高防透纤维及织物 (Light-resistant high-transmittance-proof fiber and fabric ) 是由 胡永佳 望月克彦 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种耐光高防透纤维,该纤维中的二氧化钛含量占纤维的2.0～20.0wt%,所述二氧化钛中表面包覆二氧化钛占总二氧化钛的70wt%以上。本发明的纤维中含有大量的二氧化钛,具有高防透、抗紫外线、遮热的特性。且由于所述纤维中的二氧化钛的大部分具有表面包覆层,使得本发明的纤维还具有优异的耐光性能。由部分或者全部本发明所述耐光高防透纤维制成的织物,也具有耐光、高防透、抗紫外线、遮热的特性。(The invention discloses a light-resistant high-transmittance-prevention fiber, wherein the content of titanium dioxide in the fiber accounts for 2.0-20.0 wt% of the fiber, and the surface coating of titanium dioxide in the titanium dioxide accounts for more than 70wt% of the total titanium dioxide. The fiber contains a large amount of titanium dioxide, and has the characteristics of high penetration resistance, ultraviolet resistance and heat shielding. And because most of the titanium dioxide in the fiber has a surface coating layer, the fiber also has excellent light resistance. The fabric made of part or all of the light-resistant high-transmittance-resistant fibers also has the characteristics of light resistance, high transmittance resistance, ultraviolet resistance and heat shielding.)

1. Light-fast high anti-transparent fibre, its characterized in that: the content of titanium dioxide in the fiber accounts for 2.0-20.0 wt% of the fiber, and the surface coating titanium dioxide in the titanium dioxide accounts for more than 70wt% of the total titanium dioxide.

2. The light-resistant high-transmittance-proof fiber according to claim 1, wherein: the coating layer of which the surface is coated with the titanium dioxide is one or more than two of silicon dioxide, aluminum oxide, zirconium dioxide and aluminum oxide/titanium dioxide coprecipitate.

3. The light-resistant high-transmittance-prevention fiber according to claim 1 or 2, characterized in that: the outermost layer of the coating layer with the surface coated with the titanium dioxide is aluminum oxide.

4. The light-resistant high-transmittance-proof fiber according to claim 3, wherein: the aluminum oxide accounts for 0.5-40.0 wt% of the titanium dioxide coated on the surface.

5. The light-resistant high-transmittance-prevention fiber according to claim 1 or 2, characterized in that: the titanium dioxide is rutile titanium dioxide.

6. The light-resistant high-transmittance-prevention fiber according to claim 1 or 2, characterized in that: the titanium dioxide with the particle size of more than 4 mu m in the fiber accounts for less than 5wt% of the total amount of the titanium dioxide.

7. The light-resistant high-transmittance-prevention fiber according to claim 1 or 2, characterized in that: the fiber is a core-sheath fiber, an island-in-sea fiber, or a composite fiber having a multi-layer cross-sectional structure of 3 or more layers.

8. The light-resistant high-transmittance-proof fiber according to claim 7, wherein: in the sheath component of the core-sheath fiber, the sea component of the sea-island fiber, the titanium dioxide content in the outermost layer of the composite fiber having a multilayer cross-sectional structure of 3 or more layers is 3wt% or less of the total fiber.

9. The light-resistant high-transmittance-proof fiber according to claim 1, wherein: the polymer constituting the fibers is polyester, polyamide, polypropylene or polyurethane.

10. A fabric made partially or wholly from the lightfast high penetration resistant fiber of claim 1.

11. A fabric according to claim 10, wherein: the fabric contains 2-20 wt% of titanium dioxide relative to the weight of the fabric.

12. A fabric according to claim 10 or 11, wherein: the titanium dioxide is rutile titanium dioxide.

Technical Field

The invention relates to a light-resistant high-transmittance-proof fiber and a fabric using the same, in particular to a composite fiber with high titanium dioxide content.

Background

Visual masking is an important property of textiles, and in the field of clothing, it is related to the most basic function of a photophobic mask; in the fields of decoration and military, the method relates to special visual requirements such as one-way perspective, camouflage and the like. In addition, with the use of a large amount of Freon worldwide and the increasing severity of environmental pollution, the ozone layer in the atmosphere is seriously damaged. The long-term exposure to ultraviolet radiation can reduce the life of organic molecules, reduce the immune function of human body, damage skin, cause dermatitis, erythema, freckle and skin cancer, promote eye diseases and cause cataract. In addition, especially in hot summer, apparel with certain heat shielding properties is a pursuit of consumers. Therefore, there is an increasing demand for a fiber woven fabric that integrates high penetration resistance, ultraviolet resistance, and heat shielding properties.

Heat-shielding textiles can be broadly classified into three major categories, i.e., reflective, barrier, and radiant, depending on their principle of action. Wherein the reflective heat shield textile is reflective to heat in the visible and near infrared regions; the barrier heat-shielding textile mainly inhibits the conduction and convection of solar radiation energy in the fabric; the radiant heat shield textile emits heat absorbed by the fabric into the air at a wavelength by way of radiation. Reflective heat-shielding textiles are typically used in a wide variety of applications, and the addition of inorganic particles is generally used to improve the heat-shielding properties of clothing. Of these, titanium dioxide nanoparticles are representative and most widely used nanoparticles. In order to meet the consumer demand for heat-shielding performance of clothes, related research and development has been conducted to improve the heat-shielding performance substantially by increasing the content of titanium dioxide. The effect of improving the heat-shielding property by increasing the content of titanium dioxide is remarkable but it is difficult to satisfy the application of various environments of customers because the light resistance of the fiber is deteriorated when the amount of titanium dioxide added to the fiber is generally large.

Chinese patent CN110409016A discloses a penetration-proof, ultraviolet-resistant and heat-shielding polyester fiber containing inorganic particles accounting for 2.5-24.0 wt% of the polyester fiber. Although the fiber has a certain light resistance, the use of titanium dioxide which is not coated normally is difficult to satisfy the situation of strict light resistance, and the use of the fiber is limited.

Disclosure of Invention

The invention aims to provide a high-penetration-resistant fiber with good light resistance, ultraviolet resistance and heat shielding performance and a fabric formed by the fiber.

The technical solution of the invention is as follows:

the light-resistant high-transmittance-resistant fiber comprises 2.0-20.0 wt% of titanium dioxide, and the surface coating of titanium dioxide in the titanium dioxide accounts for more than 70wt% of the total titanium dioxide.

The coating layer of which the surface is coated with the titanium dioxide is preferably one or more than two of silicon dioxide, aluminum oxide, zirconium dioxide and aluminum oxide/titanium dioxide coprecipitate.

The outermost layer of the coating layer of the surface-coated titanium dioxide is preferably aluminum oxide, and the aluminum oxide preferably accounts for less than 40wt% of the surface-coated titanium dioxide.

The titanium dioxide is preferably rutile titanium dioxide.

The titanium dioxide having a particle size of 4 μm or more in the fiber is preferably 5wt% or less of the total amount of titanium dioxide.

The fiber is preferably a core-sheath fiber, an island-in-sea fiber, or a composite fiber having a multi-layer cross-sectional structure of 3 or more layers.

In the sheath component of the core-sheath fiber, the sea component of the sea-island fiber, the titanium dioxide content in the outermost layer of the composite fiber having a multilayer cross-sectional structure of 3 or more layers is preferably 3wt% or less based on the total amount of the fiber.

The polymer constituting the fibers is preferably polyester, polyamide, polypropylene or polyurethane.

The invention also discloses a fabric, which is partially or completely prepared from the high-permeability-resistant fiber.

The fabric contains 2-20 wt% of titanium dioxide relative to the weight of the fabric, and the titanium dioxide is preferably rutile type titanium dioxide.

The fiber contains a large amount of titanium dioxide, and has the characteristics of high penetration resistance, ultraviolet resistance and heat shielding. And because most of the titanium dioxide in the fiber has a surface coating layer, the fiber also has excellent light resistance. The fabric made of part or all of the light-resistant high-transmittance-resistant fibers also has the characteristics of light resistance, high transmittance resistance, ultraviolet resistance and heat shielding.

Drawings

FIG. 1 shows a cross-sectional view of a core-sheath composite profile structural fiber.

Figure 2 shows a cross-sectional view of an eccentric core sheath composite profile structural fiber.

FIG. 3 shows a cross-sectional view of an island in the sea composite profile structural fiber.

Figure 4 shows a cross-sectional view of a 3-layer concentric composite profile structural fiber.

Figure 5 shows a cross-sectional view of a 9-ply concentric composite profile structural fiber.

FIG. 6 shows a cross-sectional view of a side-by-side multi-layer composite cross-section structural fiber.

In fig. 1 to 6, reference numeral 1 denotes a polymer having a large titanium dioxide content, and reference numeral 2 denotes a polymer having a small titanium dioxide content.

Detailed Description

The content of titanium dioxide in the light-resistant high-transmittance-resistant fiber is 2.0-20.0 wt% of the whole fiber. If the content of the titanium dioxide is less than 2.0wt%, the effects of penetration resistance, ultraviolet resistance and heat shielding cannot be achieved; if the content of titanium dioxide is more than 20.0wt%, it may cause a rapid increase in the pack pressure during spinning, which may affect the spinning properties of the apparatus and the polymer. The titanium dioxide in the light-resistant high-transmittance-resistant fiber preferably accounts for 5.0-15.0 wt% of the whole fiber.

Although the anti-penetration effect and the ultraviolet and heat resistance of the fiber can be ensured by containing 2.0-20.0 wt% of titanium dioxide, the light resistance of the fiber is poor because the titanium dioxide for the fiber is uncoated titanium dioxide. Therefore, in order to improve the light resistance of the fiber and the fabric, the titanium dioxide used in the invention is surface-coated titanium dioxide, and the content of the surface-coated titanium dioxide accounts for more than 70wt% of the total weight of the titanium dioxide.

The substance forming the surface-coated titanium dioxide coating layer may be an inorganic substance or an organic substance.

The inorganic substance may be aluminum stearate, Na (PO)₃)₆、Na(PO₃)₆Silicon dioxide, hydrogen hydroxideAluminum, aluminum oxide, zirconium dioxide, titanium dioxide/aluminum oxide coprecipitate, etc., wherein one or more of silicon dioxide, aluminum oxide, zirconium dioxide, titanium dioxide/aluminum oxide coprecipitate is preferred.

The organic substance can be cationic surfactant, such as organic amine, such as triethanolamine, ethanolamine, etc.; polyhydric alcohols such as pentaerythritol, propylene glycol, octanediol, and the like; nonionic surfactants such as polyhydric alcohol derivatives, adducts of ethylene oxide and various organic hydrophobic groups; organic silicon compounds such as methyl silicone oil, trimethylchlorosilane and the like; others include protective colloids, insoluble resins, volatile organic compounds, such as lower aliphatic organic compounds containing halogen, alcohol, ketone, ether groups.

In order to obtain better light-resistant effect, in the inorganic coating layer and the organic coating layer, the inorganic coating layer is preferably selected, and more preferably, one or more than two of silicon dioxide, aluminum oxide, zirconium dioxide and titanium dioxide/aluminum oxide coprecipitate in the inorganic coating layer.

The coating layer of the titanium dioxide on the surface can be one layer or several layers, and the more the layers, the more the light resistance of the fabric is improved. The multiple coating layers may be of the same or different materials. In order to obtain better light-resistant effect, the outermost layer of the coating layer coated with the titanium dioxide on the surface is preferably aluminum oxide.

Although the thickness of the coating layer alumina can be freely adjusted, if the amount of the coating layer is too much, the light resistance and the masking effect of the fiber are affected, so that it is preferable that the amount of alumina in the coating layer is less than 40wt% of the coated titanium dioxide in the present invention.

The titanium dioxide used in the fiber is generally anatase type titanium dioxide and rutile type titanium dioxide, and both the anatase type titanium dioxide and the rutile type titanium dioxide which are coated on the surface can realize the effects of light resistance and high penetration resistance. However, anatase titanium dioxide is unstable in crystal structure and tends to generate radicals, and when the radicals accumulate in a certain amount, the light fastness of the polymer is affected. Therefore, in order to obtain more excellent light fastness of the fiber, it is preferable in the present invention that the titanium dioxide is rutile type titanium dioxide.

The larger the particle size of titanium dioxide particles in polyester is, the more likely the titanium dioxide particles clog a filter in a module at the time of spinning to cause a pressure rise in the module, and the spinning cycle becomes short, making mass production difficult. The particles with larger particle size pass through the filter screen, the phenomenon of yarn breaking can occur during spinning, and the spinning efficiency is greatly influenced. Although the primary particle size of titanium dioxide is relatively uniform, a certain degree of agglomeration always occurs in the mixing and spinning process, and if the agglomeration proportion is too high and the particle size of titanium dioxide particles formed after agglomeration is too large, the spinning property is affected. The titanium dioxide for the fiber is uncoated anatase titanium dioxide, so that the use amount is small, the dispersion is good, and the common spinning requirement is met. However, for a system with a large content of titanium dioxide, the probability of collision and agglomeration among titanium dioxide nano particles is increased, and the titanium dioxide nano particles are easy to agglomerate. The invention selects inorganic or organic coated titanium dioxide, can still show good dispersibility when the addition amount is larger, and has good spinning performance. In the present invention, it is preferable that the titanium dioxide having a particle size of 4 μm or more in the fiber is 5wt% or less based on the total amount of the titanium dioxide.

The section form of the light-resistant high-transmittance-resistant fiber can be single fiber or composite fiber. The composite fiber may be a core-sheath fiber, an island-in-sea fiber, a composite fiber having a multi-layer cross-sectional structure of 3 or more layers, a side-by-side fiber, or the like. In order to obtain better spinnability and long-term light resistance, high anti-penetration, ultraviolet resistance and heat shielding effects, the fiber is preferably core-sheath fiber, sea-island fiber, composite fiber with a multi-layer section structure of more than 3 layers. In the sheath component of the core-sheath fiber, it is more preferable that the titanium dioxide content in the outermost layer of the composite fiber having a multilayer cross-sectional structure of 3 or more layers in the sea component of the sea-island fiber is as low as possible and is 3wt% or less based on the total fiber.

When the light-resistant high light-transmitting barrier fiber of the present invention is a composite fiber, the polymer a constituting the outermost layer of the composite fiber having a multi-layer cross-sectional structure of 3 or more layers and the polymer B constituting the core component having a large titanium dioxide content, the island component and the inner layer of the composite fiber having a multi-layer cross-sectional structure of 3 or more layers are not particularly limited and include various thermoplastic polymers and recycled products thereof, and the polymer a and the polymer B may be the same or different.

Through wrapping polymer B that titanium dioxide content is high with polymer A that titanium dioxide content is low, direct contact such as a large amount of inorganic particles and for glib talker, each filar guide of spinning machine, roller has been avoided during the spinning, reduce frictional resistance, guarantee the good engineering trafficability characteristic of strand silk, and avoid the higher polymer B direct contact spinning machine each part of titanium dioxide content to lead to droing, pollute and give glib talker, filar guide and roller, reduce the light-fast, prevent the influence of penetrating, ultraviolet resistance, heat-proof performance to the fibre, also can reduce the broken silk rate of back-processing process simultaneously.

The polymer A can be polyester polymer or polyamide polymer, and can also be polyolefin polymer. Specifically, the polyester-based polymer may be a homopolymer such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, or a copolymer thereof; according to different functions, the polyester polymer can be disperse dye dyeable polyester, cationic dye dyeable polyester, easily soluble polyester, conductive polyester, antistatic polyester, hygroscopic polyester, low friction polyester and the like; the polyamide polymer can be polyamide 6, cationic dye dyeable polyamide 6, polyamide 66 and the like; the polyolefin-based polymer may be polyethylene, polypropylene, polybutadiene, or the like.

The polymer B can be polyester polymer or polyamide polymer, and can also be polyolefin polymer. Specifically, the polyester-based polymer may be a homopolymer such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, or a copolymer thereof; the polyamide polymer can be polyamide 6, cationic dye dyeable polyamide 6, polyamide 66 and the like; the polyolefin-based polymer may be polyethylene, polypropylene, polybutadiene, or the like.

The polymer A and the polymer B constituting the fiber of the present invention are preferably polyester, polyamide, polypropylene or polyurethane, respectively.

The form of the fiber in the present invention is not particularly limited, and the fiber may be a long fiber or a short fiber.

The high-transmittance-resistant fiber can be used for preparing light-resistant, high-transmittance-resistant, ultraviolet-resistant and heat-shielding fabrics. The light-resistant high-penetration resistant fiber of the present invention may be partially or entirely used in a fabric. The fabric includes woven fabric, knitted fabric, tertiary fabric, non-woven fabric, multi-directional fabric, three-dimensional fabric, composite fabric, and the like.

When the light-resistant high-transmittance-proof fiber of the present invention is partially used, other fibers may be ordinary polyester fibers, polyamide fibers, polyolefin fibers, polyurethane fibers, or the like. The content of titanium dioxide in the fabric is preferably 2.0-20.0 wt% of the total weight of the fabric. The titanium dioxide, most preferably rutile titanium dioxide.

By using the surface coated titanium dioxide, the obtained fiber and fabric have excellent light resistance, anti-penetration, ultraviolet resistance and heat shielding performance.

The test method of each parameter related in the invention is as follows:

(1) penetration resistance

The reference color white board and the reference color black board were irradiated with a light source D65, and the values of L were measured as L (white) and L (black). Then, a fabric sample cloth (10 × 10cm) is taken and covered on a white board and a black board of a reference color respectively, the sample cloth is irradiated by a D65 light source, the L values of the sample cloth are measured to be L (white + cloth) and L (black + cloth), and then the data of light ray penetration resistance are obtained by calculation according to the following formula. The larger the data of the light penetration prevention obtained, the better the penetration prevention performance of the display sample cloth.

Light ray impermeability: (1- (L (white + cloth) -L (black + cloth))/(L (white) -L (black)). times.100%.

(2) UVA, UPF (ultraviolet resistance)

The UV resistance parameters UVA, UPF are evaluated according to the standard GB/T6529.

(3) Titanium dioxide content in fabrics

About 4g of the fiber fabric is taken, melted and prepared into a sample, the content of metal elements in the fiber fabric is measured by an X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX Primus III +), and then the content of inorganic particles in the fabric is calculated by molecular formula.

(4) Fastness to light

The light fastness rating was determined by testing the light fastness for 20 hours according to JIS L0842, comparing the sample after the irradiation treatment with a control sample without irradiation, and judging according to the standard control gray card.

(5) Rutile titanium dioxide

The obtained fiber is melted to prepare a film, an X-ray diffraction device is used for testing the position of a crystallization peak, the position of a crystallization peak of common rutile titanium dioxide is tested at the same time, and the crystal form of the titanium dioxide is judged by comparing the positions of the crystallization peaks obtained by the X-ray diffraction device and the rutile titanium dioxide.

(6) Content of coated titanium dioxide

And performing surface scanning on the titanium element and the coating element on the cross section of the fiber through TEM-EDX so as to distinguish the coated titanium dioxide from the uncoated titanium dioxide. The proportion of the titanium dioxide content was calculated by analyzing the area ratio of the coated titanium dioxide and the uncoated titanium dioxide.

(7) Titanium dioxide dispersion diameter

The dispersion diameter of titanium dioxide was analyzed by scanning titanium dioxide on the cross section of the fiber by TEM.

(8) Composition of titanium dioxide coating layer

And (4) carrying out element analysis on the titanium dioxide coating layer through the ultra-high-power TEM-EDX to obtain the type and content of the coating layer.

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

(9) Content of outer titanium dioxide in the fiber

The outer layer parts of the fiber middle sheath/core, sea/island, and more than 3 layers of multi-layer cross section are separated by a slicing method under a microscope, and the separated parts are subjected to the quantitative analysis of titanium dioxide by ICP-MS.

Example 1

70 parts by weight of the total amount of the components is 15.0wt%Rutile type TiO of₂Particulate polyethylene terephthalate (PET) (core component) and 30 parts by weight of a composition containing 0.3wt% TiO₂The semi-dull polyester (sheath component) of the particles was precrystallized and dried to 50ppm or less, and then put into a spinning bin of A, B for spinning and false twisting, respectively, to obtain a long fiber having high barrier properties. The fiber cross section core-sheath structure, the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 95.1 percent, and the tubular woven article has the uvioresistant performance and the light fastness of more than 5 grades.

Example 2

40 parts by weight of a composition containing 4.6% by weight of rutile TiO₂Particulate polyethylene terephthalate (PET) (core component) and 60 parts by weight of a composition containing 0.3wt% TiO₂The semi-dull polyester (sheath component) of the particles was precrystallized and dried to 50ppm or less, and then put into a spinning bin of A, B for spinning and false twisting, respectively, to obtain a long fiber having high barrier properties. The fiber cross section core-sheath structure, the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 92.5 percent, and the tubular woven article has the uvioresistant performance and the light fastness of more than 5 grades.

Example 3

80 parts by weight of rutile TiO containing 24.8.0wt%₂Particulate polyethylene terephthalate (PET) (core component) and 60 parts by weight of a composition containing 0.3wt% TiO₂The semi-dull polyester (sheath component) of the particles was precrystallized and dried to 50ppm or less, and then put into a spinning bin of A, B for spinning and false twisting, respectively, to obtain a long fiber having high barrier properties. The fiber cross section core-sheath structure, the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 96.5 percent, and the tubular woven article has the uvioresistant performance and the light fastness of more than 5 grades.

Examples 4 to 6

Core-sheath fibers were prepared by the method of example 1 while adjusting the ratio of the coated titanium dioxide to the total titanium dioxide in the polymer. The physical properties are shown in Table 1.

Examples 7 to 12

The composition of the titanium dioxide coating layer used was adjusted to prepare a polymer having a high titanium dioxide content, and a core-sheath fiber was prepared in the same manner as in example 1. The physical properties are shown in Table 1.

Examples 13 to 15

The amount of the alumina coating layer used was adjusted to prepare a polymer having a high titanium dioxide content, and a core-sheath fiber was prepared in the same manner as in example 1. The physical properties are shown in Table 1.

Examples 16 to 18

Core-sheath fibers were prepared by the method of example 1 by adjusting the content of titanium dioxide in the polymer having a smaller content of titanium dioxide. The physical properties are shown in Table 1.

Examples 19 to 22

Core-sheath fibers with different amounts of coated titanium dioxide were prepared by the method of example 1 while adjusting the kind of the matrix polymer. The physical properties are shown in Table 1.

Example 23

45 parts by weight of a coated rutile TiO powder containing 15.0wt% of₂Particulate polyethylene terephthalate (PET) (island component) and 55 parts by weight of a blend containing 0.3wt% TiO₂Semi-dull polyester (sea component) of the particles is respectively pre-crystallized, dried to be below 50ppm, and respectively put into a spinning bin A, B to be spun and false-twisted to obtain the high penetration-proof sea-island composite fiber. The obtained fiber is made into a tubular woven article, and the obtained tubular woven article has the advantages of 93.5 percent of penetration resistance, qualified ultraviolet resistance and light fastness of more than 5 grades.

Example 24

45 parts by weight of a coated rutile TiO powder containing 15.0wt% of₂Particulate polyethylene terephthalate (PET) and 55 parts by weight of a blend containing 0.3wt% TiO₂The semi-dull polyester particles are precrystallized, dried to below 50ppm, and spun in a spinning bin A, B to obtain long fiber with high gas barrier property. The cross section of the fiber is of a multilayer concentric circle structure, the number of the layers is 9, two polyester layers with different titanium dioxide contents are arranged in a cross way, and the outermost layer contains 0.3wt% of TiO₂Semi-dull polyester of the particles. The obtained fiber is made into a tubular woven article, the penetration resistance of the obtained tubular woven article is 93.3 percent, the ultraviolet resistance is qualified, and the light fastness is more than 5 grade.

Example 25

45 parts by weight of a coated rutile TiO powder containing 15.0wt% of₂Particle poly-p-phenyleneEthylene glycol formate (PET) and 55 parts by weight of a mixture containing 0.3% by weight of TiO₂The semi-dull polyester particles are precrystallized, dried to below 50ppm, and spun in a spinning bin A, B to obtain long fiber with high gas barrier property. The cross section of the fiber is of a multilayer concentric circle structure, the number of the layers is 3, two polyester layers with different titanium dioxide contents are arranged in a cross way, and the outermost layer contains 0.3wt% of TiO₂Semi-dull polyester of the particles. The obtained fiber is made into a tubular woven article, and the obtained tubular woven article has the advantages of 93.5 percent of penetration resistance, qualified ultraviolet resistance and light fastness of more than 5 grades.

Example 26

Core-sheath fibers were prepared as in example 1, using coated anatase titanium dioxide. The physical properties are shown in Table 1.

Comparative example 1

70 parts by weight of a composition containing 2% by weight of rutile TiO₂Polyethylene terephthalate (PET) as a particulate component (inorganic particle-rich component) and 30 parts by weight of a composition containing 0.3wt% TiO₂Semi-dull polyester (inorganic particle content is small) is precrystallized and dried to 50ppm or less, and then put into a spinning bin A, B to be spun and false-twisted to obtain long fibers with high penetration resistance. The fiber cross section sea-island structure is characterized in that the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 91.0 percent, the uvioresistant performance is unqualified, and the light fastness is more than 5 grade. Because the content of titanium dioxide is small, the impermeability is poor, and the ultraviolet resistance is unqualified.

Comparative example 2

70 parts by weight of a composition containing 50wt% rutile TiO₂Polyethylene terephthalate (PET) as a particulate component (inorganic particle-rich component) and 30 parts by weight of a composition containing 0.3wt% TiO₂Semi-dull polyester (inorganic particle content-less component) particles were each precrystallized, dried to 50ppm or less, and then fed into a spinning bin A, B for spinning. The spinning filter screen is blocked due to the overhigh content of the titanium dioxide, and the normal spinning cannot be realized.

Comparative example 3

70 parts by weight of a composition containing 15wt% rutile TiO₂Particulate polyethylene terephthalate (PET) ((PET))Inorganic particle-rich component) and 30 parts by weight of a composition containing 0.3wt% of TiO₂Semi-dull polyester (inorganic particle content is small) is precrystallized and dried to 50ppm or less, and then put into a spinning bin A, B to be spun and false-twisted to obtain long fibers with high penetration resistance. The titanium dioxide coated in the fiber accounts for 50 percent of the total amount of the titanium dioxide. The fiber cross section core-sheath structure is characterized in that the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 93.4 percent, the uvioresistant performance is unqualified, and the light fastness is 4 grade. Because the content of titanium dioxide coated on the surface is too low, the ultraviolet resistance is poor, and the light resistance is not high.

Comparative example 4

70 parts by weight of anatase type TiO containing 15wt%₂Particulate polyethylene terephthalate (PET) and 30 parts by weight of a blend containing 0.3wt% TiO₂The semi-dull polyester particles are precrystallized, dried to below 50ppm, and spun in a spinning bin A, B to obtain long fiber with high gas barrier property. The fibers do not contain coated titanium dioxide. The fiber cross section core-sheath structure is characterized in that the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 93.7 percent, the uvioresistant performance is unqualified, and the light fastness is 2 grade. Because of adopting uncoated anatase titanium dioxide, the uvioresistant performance is unqualified, and the light fastness is also very low.

Comparative example 5

70 parts by weight of a composition containing 15wt% rutile TiO₂Particulate polyethylene terephthalate (PET) and 30 parts by weight of a blend containing 0.3wt% TiO₂The semi-dull polyester particles are precrystallized, dried to below 50ppm, and spun in a spinning bin A, B to obtain long fiber with high gas barrier property. The fibers do not contain coated titanium dioxide. The fiber cross section core-sheath structure is characterized in that the obtained fiber is made into a tubular woven article, the permeability resistance of the obtained tubular woven article is 93.4 percent, the uvioresistant performance is unqualified, and the light fastness is 4 grade. Because of adopting uncoated rutile type titanium dioxide, the uvioresistant performance is unqualified, and the light fastness is not high.

TABLE 1

TABLE 2