A kind of PUR hot melt adhesive for textile and preparation method thereof

Abstract

The present invention provides a PUR hot melt adhesive for textile use and a preparation method thereof, wherein the adhesive comprises the following components in parts by weight: 88-102 parts of a polyurethane prepolymer, 10-20 parts of a hydroxy acrylate, 6.5-10 parts of a chain extender, 3-9 parts of a light-activated latent curing agent, 8-11 parts of a plasticizer, 1-2.8 parts of a cross-linking agent, 3-6 parts of a tackifier, 0.1-1 parts of a stabilizer, 0.01-0.03 parts of dibutyltin dilaurate, 1.3-2.2 parts of a photoinitiator, and 0.5-0.8 parts of a magnetic medium type absorbent; the polyurethane prepolymer is prepared by reacting a polyester polyol or a polyether polyol with a diisocyanate. The chain extender, the magnetic medium type absorbent, the plasticizer, the cross-linking agent, the tackifier, the stabilizer, and the photoinitiator are all selected from specific components or mixtures. The preparation method comprises generating a polyurethane prepolymer, preparing a polyurethane elastomer, forming a stable adhesive system, and finally preparing a PUR hot melt adhesive. The adhesive has good bonding properties and water-resistant properties and is suitable for the lamination of textile fabrics.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to a PUR hot melt adhesive for textiles and a preparation method thereof. Background Art

[0002] In the textile industry, hot melt adhesives are an important adhesive widely used in the processing and manufacturing of various textiles. PUR (Polyurethane Reactive) hot melt adhesives have attracted widespread attention due to their excellent bonding strength, temperature resistance and chemical corrosion resistance. However, with the continuous development of textile technology and changes in market demand, the performance requirements for PUR hot melt adhesives are also increasing.

[0003] Traditional PUR hot melt adhesives have some defects in practical applications. First, the wire drawing phenomenon is one of the common problems in the use of PUR hot melt adhesives. During the coating or curing process, due to the high viscosity and fluidity of the adhesive, wire drawing is easy to occur, which not only affects the appearance quality of the product, but also may lead to an increase in production costs.

[0004] Secondly, water resistance is one of the performance indicators that need to be focused on in the application of PUR hot melt adhesives in textiles. Traditional PUR hot melt adhesives are prone to problems such as decreased bonding strength and reduced peel strength in humid environments, which affects their application effect on textiles.

[0005] In addition, flexibility is also an important factor that needs to be considered in the application of PUR hot melt adhesives in textiles. Textiles often need to undergo deformation such as stretching and bending during processing and use, so the adhesive is required to have a certain degree of flexibility to ensure that the textiles can still maintain a good bonding effect after deformation. However, traditional PUR hot melt adhesives often have deficiencies in flexibility and are difficult to meet the application requirements of textiles under complex deformation conditions. Summary of the invention

[0006] In view of this, the present invention proposes a PUR hot melt adhesive for textile use and a preparation method and application thereof to solve the above problems.

[0007] The technical solution of the present invention is achieved as follows: a PUR hot melt adhesive for textiles, comprising the following components by weight: 88-102 parts of polyurethane prepolymer, 10-20 parts of hydroxy acrylate, 6.5-10 parts of chain extender, 3-9 parts of light-activated latent curing agent, 8-11 parts of plasticizer, 1-2.8 parts of crosslinking agent, 3-6 parts of tackifier, 0.1-1 parts of stabilizer, 0.01-0.03 parts of dibutyltin dilaurate, 1.3-2.2 parts of photoinitiator, 0.5-0.8 parts of magnetic medium type absorbent; the polyurethane prepolymer is obtained by polyester polyol or polyether polyol The invention is prepared by reacting with diisocyanate; the chain extender is 1,4-butanediol, trimethylolpropane and dimethylglyoxime in a mass ratio of (5.6-11.3):(3.9-8.0):(1.2-3.5); the magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder, which can effectively improve the adhesion and uniformity of the adhesive on the textile; the plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of (8.2-11.3):(6.1-8.0):(1.3-5.5); bitter almond gum is a natural plant gum extracted from bitter almonds.

[0008] Furthermore, the PUR hot melt adhesive for textiles includes the following components in parts by weight: 95 parts of polyurethane prepolymer, 15 parts of hydroxy acrylate, 8.5 parts of chain extender, 6 parts of photoactivated latent curing agent, 10 parts of plasticizer, 2.2 parts of cross-linking agent, 5 parts of tackifier, 0.7 parts of stabilizer, 0.02 parts of dibutyltin dilaurate, 1.7 parts of photoinitiator, and 0.7 parts of magnetic medium type absorber; the photoactivated latent curing agent is a diazonium salt or an iodonium salt, which decomposes into free radicals or other active substances under ultraviolet radiation, and can initiate a polymerization reaction in the adhesive.

[0009] Furthermore, the crosslinking agent is diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) or a mixture thereof.

[0010] Furthermore, the tackifier is selected from rosin resin, terpene resin, petroleum resin or a mixture thereof.

[0011] Furthermore, the stabilizer is selected from hindered amine light stabilizers, hindered phenol antioxidants or mixtures thereof; the hindered amine light stabilizers are selected from 770, 622, 944, 783 or 2020; the hindered phenol antioxidants are selected from 1010, 1076, MIANOX AO-80 or MIANOX245.

[0012] Furthermore, the photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of (1.2-2.5):(4.8-8.8):(3.5-6.5).

[0013] Further, a method for preparing a PUR hot melt adhesive for textile use comprises the following steps:

[0014] S1, reacting polyester polyol or polyether polyol with diisocyanate at 70-80° C. for 2-4 hours to generate a polyurethane prepolymer, wherein the mass ratio of the polyester polyol or polyether polyol to the diisocyanate is (5.5-7.0):(2.5-3.5);

[0015] S2, mixing the above-mentioned polyurethane prepolymer, hydroxy acrylate, chain extender and dibutyltin dilaurate, stirring at high speed, and then reacting at 100-110° C. for 14-18 hours to generate a polyurethane elastomer;

[0016] S3, add a crosslinking agent, a tackifier, a stabilizer, and a plasticizer to the polyurethane elastomer in sequence, mix them, stir them evenly under the assistance of ultrasound to form a stable adhesive system, let it stand for 20-60 minutes, and set aside;

[0017] S4. Add the photoinitiator and magnetic medium absorbent into the adhesive system, maintain the temperature at 40-60°C, use magnetic stirring for 15-55 minutes to obtain a PUR hot melt adhesive.

[0018] Furthermore, the high-speed stirring rate of S2 is 800-1200 rpm, and the stirring time is 15-30 min.

[0019] Furthermore, the magnetic strength of the magnetic stirring of S2 is 5000-9000 GS, and the magnetic speed is 200-500 rpm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a PUR hot melt adhesive for textiles and a preparation method thereof. The hot melt adhesive is designed through a precise formula, including components such as polyurethane prepolymer, hydroxy acrylate, chain extender, light-activated latent curing agent, plasticizer, crosslinker, tackifier, stabilizer, dibutyltin dilaurate, photoinitiator and magnetic medium type absorbent, aiming to reduce the wire drawing phenomenon, improve the water washing resistance, and enhance the flexibility. By optimizing the synthesis process and adding specific additives, the hot melt adhesive can solve the defects of traditional PUR hot melt adhesives in wire drawing phenomenon, water resistance and flexibility while maintaining high bonding strength, so as to meet the demand of the textile industry for high-performance PUR hot melt adhesives. DETAILED DESCRIPTION

[0022] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0023] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0024] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0025] Example 1

[0026] A PUR hot melt adhesive for textile use, comprising the following components in parts by weight: 88 parts of polyurethane prepolymer, 10 parts of hydroxy acrylate, 6.5 parts of chain extender, 3 parts of light-activated latent curing agent, 8 parts of plasticizer, 1 part of cross-linking agent, 3 parts of tackifier, 0.1 part of stabilizer, 0.01 part of dibutyltin dilaurate, 1.3 parts of photoinitiator, and 0.5 part of magnetic medium type absorbent;

[0027] The polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate;

[0028] The chain extender is 1,4-butanediol, trimethylolpropane, and dimethylglyoxime in a mass ratio of 5.6:3.9:1.2;

[0029] The light-activated latent curing agent is a diazonium salt;

[0030] The plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of (8.2-11.3):(6.1-8.0):(1.3-5.5);

[0031] The cross-linking agent is diphenylmethane diisocyanate (MDI);

[0032] The tackifier is selected from rosin resin;

[0033] The stabilizer is selected from light stabilizer 770 and antioxidant 1076;

[0034] The photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 1.2:4.8:3.5;

[0035] The magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder.

[0036] Example 2

[0037] A PUR hot melt adhesive for textile use, comprising the following components in parts by weight: 102 parts of polyurethane prepolymer, 20 parts of hydroxy acrylate, 10 parts of chain extender, 9 parts of light-activated latent curing agent, 11 parts of plasticizer, 2.8 parts of crosslinking agent, 6 parts of tackifier, 1 part of stabilizer, 0.03 parts of dibutyltin dilaurate, 2.2 parts of photoinitiator, and 0.8 parts of magnetic medium type absorbent;

[0038] The polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate;

[0039] The chain extender is 1,4-butanediol, trimethylolpropane, and dimethylglyoxime in a mass ratio of 11.3:8.0:3.5;

[0040] The light-activated latent curing agent is an iodonium salt;

[0041] The plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of (8.2-11.3):(6.1-8.0):(1.3-5.5);

[0042] The cross-linking agent is toluene diisocyanate (TDI);

[0043] The tackifier is selected from terpene resins;

[0044] The stabilizer is selected from light stabilizer 622 and antioxidant MIANOX AO-80;

[0045] The photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 2.5:8.8:6.5;

[0046] The magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder.

[0047] Example 3

[0048] A PUR hot melt adhesive for textile use, comprising the following components in parts by weight: 95 parts of polyurethane prepolymer, 15 parts of hydroxy acrylate, 8.5 parts of chain extender, 6 parts of light-activated latent curing agent, 10 parts of plasticizer, 2.2 parts of cross-linking agent, 5 parts of tackifier, 0.7 parts of stabilizer, 0.02 parts of dibutyltin dilaurate, 1.7 parts of photoinitiator, and 0.7 parts of magnetic medium type absorbent;

[0049] The polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate;

[0050] The chain extender is 1,4-butanediol, trimethylolpropane, and dimethylglyoxime in a mass ratio of 8.5:7.2:2.5;

[0051] The light-activated latent curing agent is an iodonium salt;

[0052] The plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of 10:7:3.5;

[0053] The crosslinking agent is a mixture of diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI) in a mass ratio of 1:1;

[0054] The tackifier is selected from petroleum resin;

[0055] The stabilizer is selected from light stabilizer 622 and antioxidant MIANOX245;

[0056] The photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 2.2:6.8:4.2;

[0057] The magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder;

[0058] The above examples 1-3 adopt the following preparation method:

[0059] S1, reacting polyester polyol or polyether polyol with diisocyanate at 70-80° C. for 2-4 hours to generate a polyurethane prepolymer, wherein the mass ratio of the polyester polyol or polyether polyol to the diisocyanate is (5.5-7.0):(2.5-3.5);

[0060] S2, mixing the above-mentioned polyurethane prepolymer, hydroxy acrylate, chain extender and dibutyltin dilaurate, stirring at a high speed of 800-1200 rpm for 15-30 minutes, and then reacting at 100-110° C. for 14-18 hours to generate a polyurethane elastomer;

[0061] S3, add a crosslinking agent, a tackifier, a stabilizer, and a plasticizer to the polyurethane elastomer in sequence, mix them, stir them evenly under the assistance of ultrasound to form a stable adhesive system, let it stand for 20-60 minutes, and set aside;

[0062] S4. Add the photoinitiator and the magnetic medium absorbent to the adhesive system, maintain the temperature at 40-60°C, use magnetic stirring for 15-55 minutes, control the magnetic strength to 5000-9000GS, and the magnetic speed to 200-500rpm to obtain a PUR hot melt adhesive.

[0063] Example 4

[0064] A PUR hot melt adhesive for textile use, comprising the following components in parts by weight: 95 parts of polyurethane prepolymer, 15 parts of hydroxy acrylate, 8.5 parts of chain extender, 6 parts of light-activated latent curing agent, 10 parts of plasticizer, 2.2 parts of cross-linking agent, 5 parts of tackifier, 0.7 parts of stabilizer, 0.02 parts of dibutyltin dilaurate, 1.7 parts of photoinitiator, and 0.7 parts of magnetic medium type absorbent;

[0065] The polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate;

[0066] The chain extender is 1,4-butanediol, trimethylolpropane, and dimethylglyoxime in a mass ratio of 8.5:7.2:2.5;

[0067] The light-activated latent curing agent is an iodonium salt;

[0068] The plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of 10:7:3.5;

[0069] The crosslinking agent is a mixture of diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI) in a mass ratio of 1:1;

[0070] The tackifier is selected from petroleum resin;

[0071] The stabilizer is selected from light stabilizer 622 and antioxidant MIANOX245;

[0072] The photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 2.2:6.8:4.2;

[0073] The magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder;

[0074] The above examples 1-3 adopt the following preparation method:

[0075] S1, reacting polyester polyol or polyether polyol with diisocyanate at 70° C. for 2 h to generate a polyurethane prepolymer, wherein the mass ratio of the polyester polyol or polyether polyol to the diisocyanate is 5.5:2.5;

[0076] S2, mixing the above-mentioned polyurethane prepolymer, hydroxy acrylate, chain extender and dibutyltin dilaurate, stirring at 800 rpm for 15 min, and then reacting at 100° C. for 14 h to generate a polyurethane elastomer;

[0077] S3, add a crosslinking agent, a tackifier, a stabilizer, and a plasticizer to the polyurethane elastomer in sequence, mix them, stir them evenly under the assistance of ultrasound to form a stable adhesive system, let it stand for 20 minutes, and set aside;

[0078] S4. Add the photoinitiator and the magnetic medium absorbent to the adhesive system, maintain the temperature at 40°C, use magnetic stirring for 15 minutes, control the magnetic strength to 5000GS, and the magnetic speed to 200 rpm to obtain a PUR hot melt adhesive.

[0079] Example 5

[0080] A PUR hot melt adhesive for textile use, comprising the following components in parts by weight: 95 parts of polyurethane prepolymer, 15 parts of hydroxy acrylate, 8.5 parts of chain extender, 6 parts of light-activated latent curing agent, 10 parts of plasticizer, 2.2 parts of cross-linking agent, 5 parts of tackifier, 0.7 parts of stabilizer, 0.02 parts of dibutyltin dilaurate, 1.7 parts of photoinitiator, and 0.7 parts of magnetic medium type absorbent;

[0081] The polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate;

[0082] The chain extender is 1,4-butanediol, trimethylolpropane, and dimethylglyoxime in a mass ratio of 8.5:7.2:2.5;

[0083] The light-activated latent curing agent is an iodonium salt;

[0084] The plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of 10:7:3.5;

[0085] The crosslinking agent is a mixture of diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI) in a mass ratio of 1:1;

[0086] The tackifier is selected from petroleum resin;

[0087] The stabilizer is selected from light stabilizer 622 and antioxidant MIANOX245;

[0088] The photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 2.2:6.8:4.2;

[0089] The magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder;

[0090] The above examples 1-3 adopt the following preparation method:

[0091] S1, reacting polyester polyol or polyether polyol with diisocyanate at 80° C. for 4 hours to generate a polyurethane prepolymer, wherein the mass ratio of the polyester polyol or polyether polyol to the diisocyanate is 7.0:3.5;

[0092] S2, mixing the above-mentioned polyurethane prepolymer, hydroxy acrylate, chain extender and dibutyltin dilaurate, stirring at a high speed of 1200 rpm for 30 minutes, and then reacting at 110° C. for 18 hours to generate a polyurethane elastomer;

[0093] S3, add a crosslinking agent, a tackifier, a stabilizer, and a plasticizer to the polyurethane elastomer in sequence, mix them, stir them evenly under the assistance of ultrasound to form a stable adhesive system, let it stand for 60 minutes, and set aside;

[0094] S4. Add the photoinitiator and the magnetic medium absorbent to the adhesive system, maintain the temperature at 60°C, use magnetic stirring for 55 minutes, control the magnetic strength to 9000GS, and the magnetic speed to 500rpm to obtain a PUR hot melt adhesive.

[0095] Comparative Example 1

[0096] The difference between this comparative example and Example 3 is that the PUR hot melt adhesive for textiles includes the following components in parts by weight: 70 parts of polyurethane prepolymer, 28 parts of hydroxy acrylate, 3 parts of chain extender, 12 parts of light-activated latent curing agent, 5 parts of plasticizer, 3.5 parts of cross-linking agent, 1 part of tackifier, 1.8 parts of stabilizer, 0.5 parts of dibutyltin dilaurate, 0.3 parts of photoinitiator, and 0.1 parts of magnetic medium type absorbent.

[0097] Comparative Example 2

[0098] The difference between this comparative example and Example 3 is that the chain extender is only an equal amount of 1,4-butanediol.

[0099] Comparative Example 3

[0100] The difference between this comparative example and Example 3 is that the plasticizer of the hot melt adhesive is polyethylene glycol.

[0101] Comparative Example 4

[0102] The difference between this comparative example and Example 3 is that no magnetic medium type absorbent is added to the hot melt adhesive.

[0103] Comparative Example 5

[0104] The difference between this comparative example and Example 3 is that the photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of 1:1:1.

[0105] Test example

[0106] The hot melt adhesives prepared in the above Examples 1-5 and Comparative Examples 1-5 were tested for their water resistance, softness and wire drawing;

[0107] (1) Washing resistance test: prepare textile samples, evenly coat each sample with the above-mentioned PUR hot melt adhesive, press and place flat for 48 hours, cut the textile samples into 10 cm*2.5 cm strips, and then soak them in a constant temperature water bath at 40±3°C to simulate actual washing conditions. Control the maximum speed of the washing machine to 800 rpm for 40 minutes. After washing 100 times, take out and test the adhesion amount and peel strength of the PUR hot melt adhesive coating;

[0108] (2) Wire drawing test: Heat the PUR hot melt adhesive until it is completely melted, apply a layer of PUR hot melt adhesive evenly on the glass plate, and record the length and number of wire drawing.

[0109] (3) Softness test: Prepare the textile sample again, evenly coat it with the above-mentioned PUR hot melt adhesive, and then laminate it with another textile sample. Then test its Shore hardness with a Shore durometer to evaluate its softness.

[0110] The test results are shown in the following table:

[0111]

[0112] From the above results, it can be seen that the coating adhesion amounts of Examples 1-5 of the present invention at the beginning and after washing 100 times are relatively close, and the peel strength is maintained at a high level before and after washing, indicating that the PUR hot melt adhesive has good adhesion, washability and stability on textiles; in the wire drawing test of Examples 1-5, the wire drawing length and the number of wire drawing are controlled within a small range, which shows that these PUR hot melt adhesives are not prone to wire drawing during application and have good operability and use effect; from the Shore hardness, it can be seen that the PUR hot melt adhesives prepared in Examples 1-5 of the present invention have high softness on textiles, among which Example 3 has the best effect, which not only improves the peel strength but also improves the softness.

[0113] Comparison of Example 3 with Comparative Example 1 shows that adjusting the functional raw materials can achieve better textile effects.

[0114] Compared with Comparative Example 2, Example 3 shows that the chain extender configured by the present invention can react with the functional groups on the polymer chain in the PUR hot melt adhesive, so that the polymer chain can be extended and the molecular weight is increased, thereby improving the mechanical properties and process properties of the PUR hot melt adhesive and reducing the cohesive strength;

[0115] Compared with Comparative Example 3, the present invention prepares a plasticizer by konjac mannan, sorbitol and almond gum according to a specific ratio, wherein konjac mannan has excellent water solubility and gel property, and due to its high viscosity, can increase the fluidity of PUR hot melt adhesive, which helps PUR hot melt adhesive to maintain a certain stability and uniformity during processing and use; the hydroxyl group of sorbitol interacts with the isocyanate group to form a hydrogen bond, which can reduce the intermolecular force of PUR hot melt adhesive, making its molecular chain easier to slide and stretch, thereby improving the flexibility and ductility of PUR hot melt adhesive; the molecular chain in almond gum is inserted between the molecular chains of polyurethane elastomer, which plays a diluting role, can reduce the viscosity of PUR hot melt adhesive, and improve its fluidity; the three can synergistically improve the flexibility of adhesive, not only reduce the Shore hardness, but also effectively reduce the cohesive strength of hot melt adhesive, and reduce wire drawing phenomenon;

[0116] Compared with Comparative Example 4, Example 3 adds a magnetic medium absorbent and uses magnetic stirring to effectively improve the adhesion and uniformity of the adhesive on the textile. Specifically, when the magnetic medium absorbent is used in combination with the adhesive system, the excellent bonding performance of the adhesive system and the wave absorbing performance of the magnetic medium absorbent can complement each other to form a new type of composite material. This composite material has both the strong bonding ability of the adhesive system and the wave absorbing performance of the magnetic medium absorbent.

[0117] Comparison of Example 3 with Comparative Example 5 shows that the photoinitiator of the present invention can enhance the interaction force between molecules at a specific ratio, thereby improving the bonding strength of the PUR hot melt adhesive, and can also initiate the polymerization reaction of monomers in the PUR hot melt adhesive to form stable chemical bonds, thereby improving the weather resistance of the PUR hot melt adhesive, thereby enhancing the textile adhesion of the PUR hot melt adhesive, and improving the water resistance and peel strength.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A PUR hot melt adhesive for textile use, characterized in that: The invention comprises the following components in parts by weight: 88-102 parts of polyurethane prepolymer, 10-20 parts of hydroxy acrylate, 6.5-10 parts of chain extender, 3-9 parts of light-activated latent curing agent, 8-11 parts of plasticizer, 1-2.8 parts of crosslinking agent, 3-6 parts of tackifier, 0.1-1 parts of stabilizer, 0.01-0.03 parts of dibutyltin dilaurate, 1.3-2.2 parts of photoinitiator, and 0.5-0.8 parts of magnetic medium type absorbent; the polyurethane prepolymer is prepared by reacting polyester polyol or polyether polyol with diisocyanate; the chain extender is (5.6 -11.3):(3.9-8.0):(1.2-3.5) of 1,4-butanediol, diethyltoluenediamine, and dimethylglyoxime; the magnetic medium type absorbent is selected from spherical carbonyl iron powder and passivated carbonyl iron powder; the plasticizer is konjac mannan, sorbitol and bitter almond gum in a mass ratio of (8.2-11.3):(6.1-8.0):(1.3-5.5), and the photoinitiator is fluorinated diphenyl titanocene, benzoin ethyl ether and hydroxycyclohexane phenone in a mass ratio of (1.2-2.5):(4.8-8.8):(3.5-6.5).

2. A PUR hot melt adhesive for textile use as claimed in claim 1, characterized in that: The invention comprises the following components in parts by weight: 95 parts of polyurethane prepolymer, 15 parts of hydroxy acrylate, 8.5 parts of chain extender, 6 parts of light-activated latent curing agent, 10 parts of plasticizer, 2.2 parts of cross-linking agent, 5 parts of tackifier, 0.7 parts of stabilizer, 0.02 parts of dibutyltin dilaurate, 1.7 parts of photoinitiator and 0.7 parts of magnetic medium type absorbent; the light-activated latent curing agent is a diazonium salt or an iodonium salt.

3. A PUR hot melt adhesive for textile use as claimed in claim 1, characterized in that: The crosslinking agent is diphenylmethane diisocyanate, toluene diisocyanate or a mixture thereof.

4. A PUR hot melt adhesive for textile use as claimed in claim 1, characterized in that: The tackifier is selected from rosin resin, terpene resin, petroleum resin or a mixture thereof.

5. A PUR hot melt adhesive for textile use as claimed in claim 1, characterized in that: The stabilizer is selected from hindered amine light stabilizers, hindered phenol antioxidants or a mixture thereof.

6. The method for preparing a PUR hot melt adhesive for textile use according to claim 1, characterized in that: The following steps are involved: S1, reacting polyester polyol or polyether polyol with diisocyanate at 70-80° C. for 2-4 hours to generate a polyurethane prepolymer, wherein the mass ratio of the polyester polyol or polyether polyol to the diisocyanate is (5.5-7.0):(2.5-3.5); S2, mixing the above-mentioned polyurethane prepolymer, hydroxy acrylate, chain extender and dibutyltin dilaurate, stirring at high speed, and then reacting at 100-110° C. for 14-18 hours to generate a polyurethane elastomer; S3, add a crosslinking agent, a tackifier, a stabilizer, and a plasticizer to the polyurethane elastomer in sequence, mix them, stir them evenly under the assistance of ultrasound to form a stable adhesive system, let it stand for 20-60 minutes, and set aside; S4. Add the photoinitiator and magnetic medium absorbent into the adhesive system, maintain the temperature at 40-60°C, use magnetic stirring for 15-55 minutes to obtain a PUR hot melt adhesive.

7. The method for preparing a PUR hot melt adhesive for textile use according to claim 6, characterized in that: The high-speed stirring rate of S2 is 800-1200 rpm, and the stirring time is 15-30 min.

8. The method for preparing a PUR hot melt adhesive for textile use according to claim 6, characterized in that: The magnetic strength of the magnetic stirring of S2 is 5000-9000 GS, and the magnetic speed is 200-500 rpm.

Images