阅读说明：本技术 一种阻燃涤纶工业丝及其制备方法 (Flame-retardant polyester industrial yarn and preparation method thereof ) 是由 宋明根 姬洪 薛勇 亓书奎 王刚 张玉梅 于 2019-09-16 设计创作，主要内容包括：本发明涉及一种阻燃涤纶工业丝及其制备方法,先利用含羟基的多孔粉体材料、含可反应酸性羟基的阻燃单体和二元醇制备负载型阻燃剂,再将其分散在特性粘度≥0.85dL/g的高粘聚酯中后进行熔融纺丝制得阻燃涤纶工业丝；制得的阻燃涤纶工业丝主要由涤纶工业丝以及分散在其中的负载型阻燃剂组成,负载型阻燃剂主要由多孔粉体材料和阻燃剂组成,阻燃剂分散在多孔粉体材料的孔内和表面,与多孔粉体材料之间通过物理吸附作用和化学键力作用结合,阻燃剂主要为含可反应酸性羟基的阻燃单体与二元醇的缩聚反应产物。本发明的方法简单易行,有效减少了阻燃剂迁移现象的发生,制得的阻燃涤纶工业丝机械性能较好,阻燃效果优异。(the invention relates to a flame-retardant polyester industrial yarn and a preparation method thereof, which comprises the steps of firstly preparing a load-type flame retardant by utilizing a porous powder material containing hydroxyl, a flame-retardant monomer containing reactive acidic hydroxyl and dihydric alcohol, dispersing the load-type flame retardant in high-viscosity polyester with the intrinsic viscosity of more than or equal to 0.85dL/g, and then carrying out melt spinning to prepare the flame-retardant polyester industrial yarn; the prepared flame-retardant polyester industrial yarn mainly comprises polyester industrial yarn and a load-type flame retardant dispersed in the polyester industrial yarn, wherein the load-type flame retardant mainly comprises a porous powder material and a flame retardant, the flame retardant is dispersed in pores and on the surface of the porous powder material and is combined with the porous powder material through physical adsorption and chemical bond force, and the flame retardant is mainly a polycondensation reaction product of a flame-retardant monomer containing reactive acidic hydroxyl and dihydric alcohol. The method is simple and easy to implement, the occurrence of the migration phenomenon of the flame retardant is effectively reduced, and the prepared flame-retardant polyester industrial yarn has good mechanical property and excellent flame-retardant effect.)

1. A preparation method of flame-retardant polyester industrial yarn is characterized by comprising the following steps: firstly, preparing a load-type flame retardant, dispersing the load-type flame retardant in high-viscosity polyester with the intrinsic viscosity of more than or equal to 0.85dL/g, and then carrying out melt spinning to prepare the flame-retardant polyester industrial yarn;

The preparation method of the supported flame retardant comprises the following steps:

(1) Carrying out acetylation reaction on the porous powder material containing the hydroxyl and acetic anhydride;

(2) adding a flame-retardant monomer containing a reactive acidic hydroxyl group into the system obtained in the step (1) to perform an ester exchange reaction, and controlling the excessive amount of the flame-retardant monomer containing the reactive acidic hydroxyl group;

(3) And (3) adding dihydric alcohol into the system in the step (2) to carry out polycondensation reaction to obtain the supported flame retardant.

2. the preparation method of the flame-retardant polyester industrial yarn as claimed in claim 1, wherein the hydroxyl-containing porous powder material is carbon black, organic montmorillonite or porous metal oxide, the average particle size of the hydroxyl-containing porous powder material is not higher than 500nm, the porosity is not lower than 70%, and the average pore size is 10-40 nm.

3. The method for preparing the flame-retardant polyester industrial yarn as claimed in claim 2, wherein the porous metal oxide is porous magnesium oxide, porous zinc oxide or porous alumina.

4. the method for preparing the flame-retardant polyester industrial yarn as claimed in claim 2, wherein the flame-retardant monomer containing reactive acidic hydroxyl groups is a phosphorus-containing flame-retardant monomer containing reactive acidic hydroxyl groups.

5. the method for preparing the flame-retardant polyester industrial yarn as claimed in claim 4, wherein the phosphorus-containing flame-retardant monomer containing reactive acidic hydroxyl groups is DDP or CEPPA.

6. the method for preparing the flame-retardant industrial polyester yarn as claimed in claim 5, wherein the diol is ethylene glycol, propylene glycol or butylene glycol.

7. the preparation method of the flame-retardant polyester industrial yarn as claimed in claim 6, wherein in the step (1), the amount of acetic anhydride is 1-10% of the mass of the porous powder material containing hydroxyl, the temperature of acetylation is 120-180 ℃, and the time is 20-40 min;

In the step (2), the mass ratio of the using amount of the flame-retardant monomer containing the reactive acidic hydroxyl group to the using amount of the porous powder material containing the hydroxyl group in the step (1) is 50-90: 10-50, the temperature of the ester exchange reaction is 140-190 ℃, and the time is 30-60 min;

In the step (3), the using amount of the dihydric alcohol is 30-100% of the molar amount of the flame-retardant monomer containing the reactive acidic hydroxyl in the step (2), the reaction temperature is 180-220 ℃, the reaction time is 60-120 min, and the vacuum degree is 10-100 Pa.

8. the preparation method of the flame-retardant polyester industrial yarn as claimed in claim 1, wherein the melt spinning process parameters are as follows: the screw temperature is 280-310 ℃, the temperature of a first back-drawing roller is 60-70 ℃, the speed of the first back-drawing roller is 500-650 m/min, the temperature of the two back-drawing rollers is 90-100 ℃, the temperature of the three back-drawing rollers is 125-135 ℃, the temperature of a four back-drawing roller is 210-220 ℃, the temperature of a five back-drawing roller is 140-150 ℃, and the winding speed is 3000-3500 m/min.

9. the flame-retardant industrial polyester yarn prepared by the preparation method of the flame-retardant industrial polyester yarn as claimed in any one of claims 1 to 8, which is characterized in that: the polyester industrial yarn flame retardant mainly comprises polyester industrial yarn and a load type flame retardant dispersed in the polyester industrial yarn, wherein the load type flame retardant mainly comprises a porous powder material and a flame retardant, the flame retardant is dispersed in holes and on the surface of the porous powder material and is combined with the porous powder material through physical adsorption and chemical bond force, and the flame retardant is mainly a polycondensation reaction product of a flame retardant monomer containing reactive acidic hydroxyl and dihydric alcohol.

10. The flame-retardant polyester industrial yarn as claimed in claim 9, wherein the flame-retardant element content in the flame-retardant polyester industrial yarn is 5000-15000 ppm, and the mass content of the porous powder material is 5-10 wt%; the filament number of the flame-retardant polyester industrial yarn is 3-10 dtex, the breaking strength is more than 7.8cN/dtex, the elongation at break is 10.0-20.0%, the LOI is 28-38%, and the content difference of flame-retardant elements from the center of the fiber to the surface of the fiber is less than 5 wt%.

Technical Field

the invention belongs to the technical field of industrial yarns, and relates to a flame-retardant polyester industrial yarn and a preparation method thereof.

background

The polyester industrial yarn has the advantages of high strength, good dimensional stability and the like, and is widely applied to the industrial fields of tire cords, airbags, safety belts, filter cloth, lamp house cloth, covering cloth, ropes, geogrids and the like. However, polyester has no flame retardance, the oxygen index of the polyester is only about 20, the fiber product belongs to a flammable grade, and the requirement on the flame retardant product is increased along with the expansion of the application field of the polyester industrial yarn.

at present, the flame retardant technology of the polyester industrial yarn mainly comprises three types of copolymerization flame retardant, coating finishing flame retardant and blending flame retardant. The copolymerization flame-retardant method is characterized in that during melt polycondensation, a reactive flame retardant is introduced through copolymerization to prepare a basic slice, and then the molecular weight is further improved through solid-phase polycondensation to prepare high-viscosity copolyester, and then melt spinning is carried out to prepare the flame-retardant polyester industrial yarn. Researchers have conducted many researches on copolymerization to prepare flame-retardant polyester industrial yarns, for example, patent CN201110076163.4 discloses a production method of phosphorus-based copolymerization flame-retardant polyester high-strength industrial yarns, which is to prepare low-viscosity flame-retardant copolyester through melt copolymerization, increase molecular weight through solid-phase polycondensation, and then perform melt spinning to prepare high-strength flame-retardant industrial yarns; the patent CN201410240063.4 discloses a phosphorus-based copolymerization flame-retardant regenerated polyester chip and a production method of industrial filaments thereof, ester waste is thermally melted to form a bubble material, then the bubble material is dried and melted by a screw to form a regenerated polyester melt, a flame-retardant modulator and a catalyst are added into the regenerated polyester melt to carry out homogenization polymerization reaction, the melt is filtered and granulated to obtain the flame-retardant regenerated polyester chip, and the chip is tackified by solid phase polymerization, spun and subjected to drafting heat setting to obtain a finished product; the patent CN201811614100.8 discloses a terylene flame retardant canvas and a preparation method thereof, which uses dihydric alcohol with trimethylsilyl lateral group and 2-carboxyethyl phenyl hypophosphorous acid flame retardant for copolymerization to prepare modified polyester, and prepares flame retardant industrial yarn through solid phase polycondensation and spinning; patents CN200710045373.0, CN200710045377.9, and CN200710045378.3 disclose a method for preparing flame retardant polyester for industrial yarn, which uses reactive phosphorus flame retardant as comonomer to perform addition copolycondensation at different stages in the polycondensation process, and adds montmorillonite as nucleating agent to prepare flame retardant polyester. Although the copolymerization flame-retardant product has the most advantage of excellent flame-retardant durability, the product also has more serious defects, firstly, the process is greatly different from the conventional polyester in the whole production process, the whole system needs to be greatly changed, the implementation is difficult, in addition, the polymerization is more difficult and the crystallization property of the copolyester is deteriorated as the addition amount of the flame retardant is higher, so the product is difficult to have high flame retardance and is not negligible.

the coating finishing flame-retardant technology is that flame-retardant resin is coated on the surface of fiber in an oiling or back-drawing working section, the method is widely applied in production, and patent CN200820300670.5 discloses a flame-retardant polyester industrial filament, wherein a flame-retardant layer is coated on the surface of the fiber in a spinning oiling step; patent CN200810301416.1 discloses a flame-retardant polyester industrial filament and a production process thereof, wherein a flame retardant is coated between a drafting hot roller and a shaping hot roller to realize a flame-retardant function; the patent CN201510734037.1 discloses a high flame-retardant industrial filament for a ship cable, wherein the flame retardance of an auxiliary agent can be increased by adding tetraphenylporphyrin and lime powder into the auxiliary agent, and the auxiliary agent is coated on the surface of a fiber by an oiling system; patent CN201120034188.3 discloses a polyester industrial filament with flame retardant function, which is prepared by changing the shape of outer layer fiber of bundle yarn to increase the surface area and then coating a flame retardant layer. Although the coating finishing method is simple and easy, the method has a plurality of defects, for example, when the flame-retardant resin is coated on the surface of the fiber in oiling or post-drafting, the flame-retardant resin sticks and is unsmooth in production when high-temperature drafting and shaping are caused, in addition, the flame-retardant resin solution is limited in viscosity requirement, the flame retardant concentration is limited, a coating film is only formed on the surface, the content of effective flame-retardant components of the fiber is lower, the flame-retardant effect of a product is limited, furthermore, the terylene is inert, the surface reactive group is limited, and the formed surface coating film.

compared with the two methods, the blending flame retardance is realized by adding the flame retardant in the melt spinning process and preparing the flame-retardant polyester industrial yarn through melt blending spinning. The method is simple, the product has good flame-retardant fastness and is widely applied to production, and a patent CN201510713621.9 discloses a method for preparing environment-friendly flame-retardant polyester fiber by dope dyeing, environmental-friendly dye, solvent, dispersant and wetting agent are blended into liquid color paste, then environment-friendly flame retardant is added, and one or more than two flame-retardant liquid color pastes are injected into a polyester melt pipeline by a metering injection pump; patent CN200810301392.X discloses a blending flame-retardant polyester industrial filament and a production process thereof, wherein the flame-retardant polyester industrial filament is prepared by adding inorganic flame retardant master batch. Although there are many reports mentioned above, in the industrial yarn production, due to the high temperature and high shear, the flame retardant migrates to the fiber surface, and a "sheath-core" distribution structure with more inside and outside appears, so that the flame retardant component is lost, which affects the flame retardant effect and the fastness, and at the same time, the mechanical properties of the industrial yarn are deteriorated.

therefore, the method for solving the problems of flame retardant loss, industrial yarn mechanical property deterioration and the like caused by flame retardant migration in the processing process of the blended flame-retardant polyester industrial yarn has very important significance.

disclosure of Invention

The invention aims to solve the problems of flame retardant loss and industrial yarn mechanical property deterioration caused by flame retardant migration in the processing process of blended flame-retardant polyester industrial yarns in the prior art, and provides a flame-retardant polyester industrial yarn and a preparation method thereof.

in order to achieve the purpose, the invention adopts the following scheme:

a preparation method of flame-retardant polyester industrial yarn comprises the steps of firstly preparing a load-type flame retardant, dispersing the load-type flame retardant in high-viscosity polyester with the intrinsic viscosity of more than or equal to 0.85dL/g, and then carrying out melt spinning to obtain the flame-retardant polyester industrial yarn;

The preparation method of the supported flame retardant comprises the following steps:

(1) The porous powder material containing hydroxyl and acetic anhydride are subjected to acetylation reaction, and the porous powder material containing three hydroxyl is taken as an example, and the reaction formula is as follows:

(2) adding a flame-retardant monomer containing a reactive acidic hydroxyl group into the system obtained in the step (1) to perform an ester exchange reaction, and controlling the excessive amount of the flame-retardant monomer containing the reactive acidic hydroxyl group, wherein the flame-retardant monomer containing the reactive acidic hydroxyl group is DDP as an example, and the reaction formula is as follows:

Wherein HOORCOOH is DDP

(3) adding dihydric alcohol into the system in the step (2) for carrying out polycondensation reaction to prepare a load type flame retardant, and controlling the excessive amount of the flame retardant monomer containing the reactive acidic hydroxyl in the step (2), so that in the step (3), the dihydric alcohol reacts with the flame retardant monomer containing the reactive acidic hydroxyl in the system in the step (2) in addition to the reaction product in the step (2), thereby improving the molecular weight, wherein the partial reaction formula of the surface of the porous powder material is as follows:

Wherein HOORCOOH is DDP

The invention adopts the porous powder material as the flame retardant fixing carrier, utilizes the physical adsorption effect and the chemical bonding effect to firmly bind the flame retardant inside and on the surface of the porous powder material, and effectively reduces the occurrence of the migration phenomenon of the flame retardant in the processing process of the flame retardant polyester industrial yarn, and the specific reasons are that: 1) the porous powder material has good self-dispersibility and larger particle size, and is difficult to migrate, and after the flame retardant is combined with the porous powder material, the dispersibility and the migration resistance of the flame retardant are improved; 2) the flame retardant is subjected to polycondensation reaction in the combination process with the porous powder material, so that the molecular weight is increased, the molecular chain is lengthened, the movement capacity is reduced, the blocking effect in the movement process is increased, and the migration of the flame retardant is inhibited to a certain extent. In addition, the flame retardant is loaded on the porous powder material, which is equivalent to the organic modification of the porous powder material, so that the dispersion uniformity of the porous powder material is improved, the dispersion uniformity of the flame retardant is further improved, and the performance of the flame-retardant polyester industrial yarn is improved.

As a preferred technical scheme:

According to the preparation method of the flame-retardant polyester industrial yarn, the hydroxyl-containing porous powder material is carbon black, organic montmorillonite or porous metal oxide, the average particle size of the hydroxyl-containing porous powder material is not higher than 500nm, the porosity is not lower than 70%, and the average pore size is 10-40 nm.

According to the preparation method of the flame-retardant polyester industrial yarn, the porous metal oxide is porous magnesium oxide, porous zinc oxide or porous alumina.

According to the preparation method of the flame-retardant polyester industrial yarn, the flame-retardant monomer containing the reactable acidic hydroxyl is the phosphorus-containing flame-retardant monomer containing the reactable acidic hydroxyl, and the phosphorus-containing flame-retardant monomer has better flame-retardant property, so that the phosphorus-containing flame-retardant monomer is preferred as the flame-retardant monomer of the invention.

In the preparation method of the flame-retardant polyester industrial yarn, the phosphorus-containing flame-retardant monomer containing reactive acidic hydroxyl is DDP or CEPPA.

according to the preparation method of the flame-retardant polyester industrial yarn, the dihydric alcohol is ethylene glycol, propylene glycol or butanediol.

according to the preparation method of the flame-retardant polyester industrial yarn, in the step (1), the amount of acetic anhydride is 1-10% of the mass of the hydroxyl-containing porous powder material, the temperature of acetylation reaction is 120-180 ℃, and the time is 20-40 min;

in the step (2), the mass ratio of the amount of the flame-retardant monomer containing the reactable acidic hydroxyl group to the amount of the porous powder material containing the hydroxyl group in the step (1) is 50-90: 10-50, the excessive amount of the flame-retardant monomer containing the reactable acidic hydroxyl group in a reaction system relative to the porous powder material is controlled, the reaction of the dihydric alcohol in the step (3) and the excessive amount of the flame-retardant monomer containing the reactable acidic hydroxyl group can be ensured, the molecular weight of the flame retardant is improved, the temperature of the ester exchange reaction is 140-190 ℃, and the time is 30-60 min;

In the step (3), the using amount of the dihydric alcohol is 30-100% of the molar weight of the flame-retardant monomer containing the reactive acidic hydroxyl in the step (2), the reaction temperature is 180-220 ℃, the time is 60-120 min, and the vacuum degree is 10-100 Pa (the polycondensation reaction conditions are set to control the polymerization degree n of the polycondensation reaction product of the flame-retardant monomer containing the reactive acidic hydroxyl and the dihydric alcohol to be more than 20, so that the total size of the long molecular chain aggregate is more than 50nm, the molecular dynamics behavior under the limited space is usually obviously limited, the system has many characteristics which are not possessed under the macroscopic scale, the behaviors such as reaction, diffusion and the like of the system are particularly influenced, the non-equilibrium property of the system can be changed through the hydrodynamic action due to the space limitation, the migration and the transportation of the system in the fluid are obviously influenced, the average pore diameter of the porous powder material containing the hydroxyl is 10-40 nm, the flame retardant monomer micromolecules containing reactive acidic hydroxyl enter pores due to physical adsorption and undergo polycondensation in the pores, the size of the flame retardant molecule is 50-70 nm after the flame retardant molecule is polymerized, the movement of the flame retardant molecule can be inhibited in a limited pore channel, the flame retardant molecule has large molecular size and violently collides with the surface of the pore channel in a narrow pore channel to generate obvious diffusion resistance, and the flame retardant is locked in micropores of the hydroxyl-containing porous powder material based on space limitation, so that the flame retardant and the hydroxyl-containing porous powder material are combined more firmly, the dispersion uniformity of the flame retardant in a polyester matrix is further improved, and the generation of migration phenomenon is reduced).

according to the preparation method of the flame-retardant polyester industrial yarn, the melt spinning process parameters are as follows: the screw temperature is 280-310 ℃, the temperature of a first back-drawing roller is 60-70 ℃, the speed of the first back-drawing roller is 500-650 m/min, the temperature of the two back-drawing rollers is 90-100 ℃, the temperature of the three back-drawing rollers is 125-135 ℃, the temperature of a four back-drawing roller is 210-220 ℃, the temperature of a five back-drawing roller is 140-150 ℃, and the winding speed is 3000-3500 m/min.

the invention also provides the flame-retardant industrial polyester yarn prepared by the preparation method of the flame-retardant industrial polyester yarn, which mainly comprises the industrial polyester yarn and the load-type flame retardant dispersed in the industrial polyester yarn, wherein the load-type flame retardant mainly comprises a porous powder material and a flame retardant, the flame retardant is dispersed in the pores and on the surface of the porous powder material and is combined with the porous powder material through physical adsorption and chemical bond force, the flame retardant is mainly a polycondensation reaction product of a flame-retardant monomer containing a reactable acidic hydroxyl group and dihydric alcohol, when the flame-retardant monomer containing the reactable acidic hydroxyl group is not completely reacted, the flame retardant in the load-type flame retardant also comprises the flame-retardant monomer containing the reactable acidic hydroxyl group, when the flame-retardant monomer containing the reactable acidic hydroxyl group and the dihydric alcohol only undergo esterification reaction and are not further subjected to polycondensation reaction, the flame retardant in the load-type flame retardant also comprises the esterification reaction of the flame-retardant monomer containing the reactable acidic hydroxyl group and the dihydric alcohol The product is prepared.

as a preferred technical scheme:

according to the flame-retardant polyester industrial yarn, the content of flame-retardant elements in the flame-retardant polyester industrial yarn is 5000-15000 ppm, and the mass content of the porous powder material is 5-10 wt%; the filament number of the flame-retardant polyester industrial yarn is 3-10 dtex, the breaking strength is more than 7.8cN/dtex, the elongation at break is 10.0-20.0%, the LOI is 28-38%, the content difference of flame-retardant elements from the center of the fiber to the surface of the fiber is less than 5 wt%, and the dispersion of the flame retardant in the fiber and the surface of the fiber is uniform.

Has the advantages that:

(1) According to the preparation method of the flame-retardant polyester industrial yarn, the porous powder material is used as the flame retardant fixing carrier, and the flame retardant is firmly bound in the porous powder material and on the surface of the porous powder material by utilizing the physical adsorption effect and the chemical bonding effect, so that the dispersity of the flame retardant is improved, the migration of the flame retardant to the fiber surface in the industrial yarn production is reduced, and meanwhile, the degradation of the performance of the industrial yarn is avoided;

(2) the flame-retardant polyester industrial yarn prepared by the method has good mechanical property and excellent flame-retardant effect, and has great popularization value.

Detailed Description

the invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.