CN109337041B - Transparent flash polyurethane TPU chain tooth, preparation method and zipper - Google Patents
Transparent flash polyurethane TPU chain tooth, preparation method and zipper Download PDFInfo
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- CN109337041B CN109337041B CN201811056114.2A CN201811056114A CN109337041B CN 109337041 B CN109337041 B CN 109337041B CN 201811056114 A CN201811056114 A CN 201811056114A CN 109337041 B CN109337041 B CN 109337041B
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
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Abstract
The invention relates to the technical field of zipper teeth, in particular to a transparent flash polyurethane (TPU) zipper tooth, a preparation method and a zipper tooth, wherein the TPU zipper tooth is prepared from the following raw materials: isocyanate, polyalcohol, a chain extender, a cross-linking agent, flash powder, a lubricant, an antioxidant and an ultraviolet absorbent, wherein the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer. According to the invention, the surface of the micron-sized prism pyramid monomer is coated with the polyacrylamide layer, so that the micron-sized prism pyramid monomer has good compatibility and dispersibility with the polyurethane prepolymer, and the zipper teeth have a reflective and flashing appearance effect.
Description
Technical Field
The invention relates to the technical field of zipper teeth, in particular to a transparent flash polyurethane (TPU) zipper tooth, a preparation method and a zipper tooth.
Background
Zippers (zippers), which are connectors for uniting or separating articles by means of a continuous arrangement of zipper teeth, are now widely used in clothing, bags, tents, etc. The current mainstream of the zipper teeth is made of metal materials, such as copper-zinc alloy such as red copper and brass, and copper-zinc-nickel alloy such as zinc white copper. These alloys are color-toned by using materials whose color tone is copper, gold, silver.
The plastic zipper teeth are limited by the mechanical properties of plastic rigidity, stretchability and the like, so that the plastic zipper teeth cannot be widely applied, the existing plastic zipper teeth only have appearance expression of filling colors, and the metal zipper teeth do not have colorful appearance characteristics.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a transparent flash polyurethane (TPU) fastener element which has good toughness and stretchability and can make the fastener element have the appearance characteristic of flash; the invention also aims to provide a preparation method of the transparent flash polyurethane TPU chain element, which is simple and efficient and is beneficial to industrial production.
The purpose of the invention is realized by the following technical scheme:
a transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Although the patent document indicates that the micron-sized prism pyramid monomer can be suspended inside an adhesive, the micron-sized prism pyramid monomer can be effectively distinguished from an adhesive medium through a silver mirror metal layer when the micron-sized prism pyramid monomer is suspended inside the adhesive, so that only one side of the micron-sized prism pyramid monomer which is not plated with the silver mirror metal layer has good compatibility with an organic matter, and other sides plated with the silver mirror metal layer still generate larger gaps with the organic matter, so that the TPU zipper teeth have poor mechanical properties and insufficient water resistance and are easy to corrode the silver mirror metal layer by water vapor.
According to the invention, the surface of the micron-sized prism pyramid monomer is coated with the polyacrylamide layer, so that the micron-sized prism pyramid monomer has good compatibility and dispersibility with the polyurethane prepolymer, and the crosslinking agent is additionally added into the formula system to promote the crosslinking reaction between the polyacrylamide layer and the polyurethane prepolymer, so that the micron-sized prism pyramid monomer is uniformly dispersed in the polyurethane prepolymer to form the TPU zipper teeth with compact structures, and the TPU zipper teeth have excellent water resistance, stretchability and toughness.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 18-26%. The isocyanate selected by the invention has more aromatic molecular structures with stronger rigidity, and reacts with the chain extender to form a hard segment with higher rigidity, so that the obtained TPU chain element has better hardness and tensile strength.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 1-3:1-3, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 40-60mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 90-102 mgKOH/g. The polyol is the main soft segment part of the polyurethane, the ethylene oxide propylene oxide polyether polyol selected by the invention shows good crystallinity, and a rigid chain segment formed by the chain extension of isocyanate is favorably distributed in the soft segment through the action of hydrogen bonds, so that the formed polyurethane material has a better microphase separation structure, the water resistance, the hardness and the tensile strength of the polyurethane material are improved, and the polycaprolactone polyol used in compounding has lower cohesive strength and can be favorable for improving the toughness of the polyurethane material.
Wherein the chain extender is at least one of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol. In the chain extender selected by the invention, the hydroquinone dihydroxyethyl ether can improve the regularity of a hard segment and the microphase separation degree, and the prepared polyurethane material has better mechanical property; the trimethylolpropane plays a role in chain extension and also plays a role in crosslinking, so that the polyacrylamide layer in the flash powder can be promoted to be crosslinked with the polyurethane prepolymer, and the uniform dispersibility of the flash powder and the water resistance of the zipper teeth are improved; the triethylene glycol dimer can be beneficial to improving the flexibility of the polyurethane material, so that the breaking elongation of the polyurethane material is improved. Further preferably, the chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 2-4:1-2:1-2, and TPU chain teeth formed by chain extension of the compound chain extender have the optimal mechanical property and uniform flashing characteristic.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 75-90 ℃, carrying out heat preservation reaction for 1-2h, cooling to 30-36 ℃, adding diethyl malonate, carrying out end-capping reaction for 0.5-1.5h, and obtaining the cross-linking agent, wherein the molar ratio of toluene diisocyanate to castor oil to diethyl malonate is 2-4:1: 1-2. Isocyanate groups deblocked from the crosslinking agent prepared by the invention at a certain temperature can react with hydroxyl groups to generate carbamate groups, so that the crosslinking polymerization of a polyacrylamide layer and a polyurethane prepolymer is promoted, and a bridging structure is formed between flash powder and the polyurethane prepolymer, so that the flash powder has good dispersibility in TPU chain teeth, and the TPU chain teeth also have excellent performances of water resistance, high hardness and the like.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 10-20:1-3:40-60, heating to 80-90 ℃, preserving heat for 2-4h, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 20-30%.
Wherein the lubricant is at least one of stearoyl stearate, oleamide and talcum powder. Preferably, the lubricant consists of stearoyl, oleamide and talcum powder according to the weight ratio of 1-3:1-3:1, and the compounded lubricant can greatly reduce the processing difficulty and improve the dispersion uniformity of the flash powder in TPU (thermoplastic polyurethane) chain elements to the greatest extent.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1-2.
Wherein the ultraviolet absorbent is a benzophenone ultraviolet absorbent and/or a benzotriazole ultraviolet absorbent. Preferably, the ultraviolet absorber is a benzotriazole-based ultraviolet absorber.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 80-100 ℃, and reacting for 1-2h under the condition of heat preservation to obtain a polyurethane prepolymer;
(2) adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorbent into the polyurethane prepolymer, heating to the temperature of 120-160 ℃, melting and mixing, and then pouring into a chain tooth mold for curing to obtain the transparent flashing polyurethane TPU chain tooth.
The invention also provides a zipper, which comprises the zipper teeth.
The invention has the beneficial effects that: according to the invention, the surface of the micron-sized prism pyramid monomer is coated with the polyacrylamide layer, so that the micron-sized prism pyramid monomer has good compatibility and dispersibility with the polyurethane prepolymer, and the zipper teeth have a reflective and flashing appearance effect.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 22%.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 1:1, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 50mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 96 mgKOH/g.
The chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 2:1: 1.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 82 ℃, carrying out heat preservation reaction for 1.5h, cooling to 33 ℃, adding diethyl malonate, and carrying out end-capping reaction for 1h to obtain the cross-linking agent, wherein the molar ratio of toluene diisocyanate to castor oil to diethyl malonate is 3:1: 1.5.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 15:2:50, heating to 85 ℃, preserving heat for 3 hours, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 25%.
Wherein the lubricant consists of stearoyl stearate, oleamide and talcum powder according to the weight ratio of 2:2: 1.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.5.
Wherein the ultraviolet absorbent is a benzotriazole ultraviolet absorbent.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 90 ℃, and reacting for 1.5 hours in a heat preservation manner to obtain a polyurethane prepolymer;
(2) and adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorber into the polyurethane prepolymer, heating to 140 ℃, carrying out melt mixing, and then pouring into a zipper tooth mold for curing to obtain the transparent flashing polyurethane TPU zipper tooth.
Example 2
A transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 18%.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 1-3:1-3, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 40mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 90 mgKOH/g.
The chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 3:1:1.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 75 ℃, carrying out heat preservation reaction for 1h, cooling to 30 ℃, adding diethyl malonate, carrying out end-capping reaction for 0.5h, and obtaining the cross-linking agent, wherein the molar ratio of toluene diisocyanate to castor oil to diethyl malonate is 2:1: 1.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 10:1:40, heating to 80 ℃, preserving heat for 2 hours, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 20%.
Wherein the lubricant consists of stearoyl stearate, oleamide and talcum powder according to the weight ratio of 1:1: 1.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1:1.
Wherein the ultraviolet absorbent is benzophenone ultraviolet absorbent.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 80 ℃, and carrying out heat preservation reaction for 1h to obtain a polyurethane prepolymer;
(2) and adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorber into the polyurethane prepolymer, heating to 120 ℃, carrying out melt mixing, and then pouring into a zipper tooth mold for curing to obtain the transparent flashing polyurethane TPU zipper tooth.
Example 3
A transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 26%.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 3:1, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 60mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 102 mgKOH/g.
The chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 4:2: 1.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 90 ℃, carrying out heat preservation reaction for 2 hours, cooling to 36 ℃, adding diethyl malonate, carrying out end-capping reaction for 1.5 hours, and obtaining the cross-linking agent, wherein the molar ratio of toluene diisocyanate to castor oil to diethyl malonate is 4:1: 2.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 20:3:60, heating to 90 ℃, preserving heat for 4 hours, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 30%.
Wherein the lubricant consists of stearoyl stearate, oleamide and talcum powder according to the weight ratio of 3:3: 1.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 2.
Wherein the ultraviolet absorbent consists of benzophenone ultraviolet absorbent and benzotriazole ultraviolet absorbent according to the weight ratio of 1:1.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 100 ℃, and carrying out heat preservation reaction for 2 hours to obtain a polyurethane prepolymer;
(2) and adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorber into the polyurethane prepolymer, heating to 160 ℃, melting and mixing, and then pouring into a zipper tooth mold for curing to obtain the transparent flashing polyurethane TPU zipper tooth.
Example 4
A transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 20%.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 3:2, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 45mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 93 mgKOH/g.
The chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 4:1: 1.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 80 ℃, carrying out heat preservation reaction for 1.2h, cooling to 32 ℃, adding diethyl malonate, and carrying out end-capping reaction for 0.8h to obtain the cross-linking agent, wherein the molar ratio of the toluene diisocyanate to the castor oil to the diethyl malonate is 3:1:1.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 13:2:45, heating to 83 ℃, preserving heat for 2.5 hours, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 24%.
Wherein the lubricant is stearoyl.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1:1.
Wherein the ultraviolet absorbent is a benzotriazole ultraviolet absorbent.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 85 ℃, and carrying out heat preservation reaction for 1.2h to obtain a polyurethane prepolymer;
(2) and adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorber into the polyurethane prepolymer, heating to 130 ℃, carrying out melt mixing, and then pouring into a zipper tooth mold for curing to obtain the transparent flashing polyurethane TPU zipper tooth.
Example 5
A transparent flash polyurethane TPU chain element is prepared from the following raw materials in parts by weight:
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer.
Wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate, and the-NCO content of the 4, 4-diphenylmethane diisocyanate is 23%.
The polyol is composed of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol according to the weight ratio of 1:2, the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 55mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 100 mgKOH/g.
The chain extender is composed of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol according to the weight ratio of 2:1: 2.
The preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 85 ℃, carrying out heat preservation reaction for 1.8h, cooling to 35 ℃, adding diethyl malonate, and carrying out end-capping reaction for 1.2h to obtain the cross-linking agent, wherein the molar ratio of the toluene diisocyanate to the castor oil to the diethyl malonate is 3:1: 2.
The preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 18:2:57, heating to 88 ℃, preserving heat for 3.5 hours, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 27%.
Wherein the lubricant is oleamide.
Wherein the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1:1.
Wherein the ultraviolet absorbent is a benzotriazole ultraviolet absorbent.
The preparation method of the transparent flash polyurethane TPU chain element comprises the following steps:
(1) mixing isocyanate and polyol, heating to 92 ℃, and carrying out heat preservation reaction for 1.7h to obtain a polyurethane prepolymer;
(2) and adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorber into the polyurethane prepolymer, heating to 150 ℃, melting and mixing, and then pouring into a zipper tooth mold for curing to obtain the transparent flashing polyurethane TPU zipper tooth.
Comparative example 1
The comparative example differs from example 1 in that: the cross-linking agent and the glitter powder are not added in the formula system.
Comparative example 2
The comparative example differs from example 1 in that: the flash powder is replaced by micron-sized prism pyramid monomers with equal weight.
Comparative example 3
The comparative example differs from example 1 in that: no cross-linking agent is added in the formula system.
The TPU elements of examples 1-5 and comparative examples 1-3 were tested for performance, the test methods and results are as follows:
hardness: GB/T531.1-2008;
tensile strength: GB/T528-2009;
elongation at break: GB/T528-2009;
water permeability resistance: GB/T1690, wherein the soaking liquid is water, the soaking time is 7d, and the volume change rate is measured and calculated;
as can be seen from comparative example 1, the TPU teeth of the invention have better mechanical properties and water resistance without adding a cross-linking agent and micron-sized prism pyramid monomers; further, as can be seen from comparison of comparative examples 1, 2 and 3, the direct addition or non-addition of the cross-linking agent to the micron-sized prism pyramid monomer not coated with the polyacrylamide layer results in severe decrease in mechanical properties and water resistance, indicating that the cross-linking agent mainly performs a cross-linking reaction with the polyacrylamide layer of the glittering powder, thereby improving the compactness of the cross-linked structure; further, as can be seen from the comparison between comparative example 1 and example 1, the blending of the crosslinking agent and the glitter powder can realize the uniform dispersion of the glitter powder on the TPU teeth, and the TPU teeth have better mechanical properties and water resistance.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (6)
1. A transparent flash polyurethane TPU chain tooth which is characterized in that: the material is prepared from the following raw materials in parts by weight:
30-60 parts of isocyanate
10-30 parts of polyol
4-8 parts of chain extender
4-10 parts of cross-linking agent
20-40 parts of flash powder
1-3 parts of lubricant
0.1 to 1 portion of antioxidant
0.1 to 1 portion of ultraviolet absorbent,
the flash powder consists of a micron-sized prism pyramid monomer and a polyacrylamide layer coating the micron-sized prism pyramid monomer;
the isocyanate is 4, 4 '-diphenylmethane diisocyanate, and the-NCO content of the 4, 4' -diphenylmethane diisocyanate is 18-26%;
the polyol consists of ethylene oxide propylene oxide polyether polyol and polycaprolactone polyol in a weight ratio of 1-3:1-3, wherein the hydroxyl value of the ethylene oxide propylene oxide polyether polyol is 40-60mgKOH/g, and the hydroxyl value of the polycaprolactone polyol is 90-102 mgKOH/g;
the chain extender is at least one of hydroquinone dihydroxyethyl ether, trimethylolpropane and triethylene glycol;
the preparation method of the cross-linking agent comprises the following steps: mixing toluene diisocyanate and castor oil, heating to 75-90 ℃, carrying out heat preservation reaction for 1-2h, cooling to 30-36 ℃, adding diethyl malonate, carrying out end-capping reaction for 0.5-1.5h, and obtaining the cross-linking agent, wherein the molar ratio of toluene diisocyanate to castor oil to diethyl malonate is 2-4:1: 1-2.
2. A transparent glittering polyurethane TPU tooth element according to claim 1, wherein: the preparation method of the flash powder comprises the following steps: mixing a micron-sized prism pyramid monomer, an inorganic peroxide initiator and an acrylamide aqueous solution according to a weight ratio of 10-20:1-3:40-60, heating to 80-90 ℃, preserving heat for 2-4h, filtering and drying to obtain the flash powder, wherein the mass fraction of acrylamide in the acrylamide aqueous solution is 20-30%.
3. A transparent glittering polyurethane TPU tooth element according to claim 1, wherein: the lubricant is at least one of stearoyl stearate, oleamide and talcum powder.
4. A transparent glittering polyurethane TPU tooth element according to claim 1, wherein: the ultraviolet absorbent is benzophenone ultraviolet absorbent and/or benzotriazole ultraviolet absorbent.
5. A method of making a transparent glittering polyurethane TPU chain element of any of claims 1 to 4, wherein: the method comprises the following steps:
(1) mixing isocyanate and polyol, heating to 80-100 ℃, and reacting for 1-2h under the condition of heat preservation to obtain a polyurethane prepolymer;
(2) adding a chain extender, a cross-linking agent, flashing powder, a lubricant, an antioxidant and an ultraviolet absorbent into the polyurethane prepolymer, heating to the temperature of 120-160 ℃, melting and mixing, and then pouring into a chain tooth mold for curing to obtain the transparent flashing polyurethane TPU chain tooth.
6. A flashing zipper, characterized in that: a transparent glittering polyurethane TPU chain element including any one of claims 1-5.
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