Environment-friendly high-performance PUR hot melt adhesive and preparation method thereof

Abstract

The invention relates to the technical field of hot melt adhesives, and discloses an environment-friendly high-performance PUR hot melt adhesive and a preparation method thereof, and the preparation method of the PUR hot melt adhesive comprises the following steps: (1) preparing a first prepolymer; (2) preparing a second prepolymer; (3) preparing a modified matrix; (4) preparing a finished product; the prepared hot melt adhesive has good melt fluidity and high stability, has excellent flexibility, water resistance and acid and alkali resistance after being cured, and can be applied to multiple fields.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to an environmentally friendly high-performance PUR hot melt adhesive and a preparation method thereof. Background Art

[0002] PUR hot melt adhesive is a new type of high-performance strong structural adhesive, mainly composed of isocyanate-based polyurethane components. It has excellent viscosity, strength and corrosion resistance, and can be widely used in the bonding of new energy, lithium batteries, photovoltaics, food packaging, furniture, printing, packaging, construction and other fields, and can meet the application requirements of high bonding strength, high weather resistance and high quality. At the same time, due to the high-temperature hot melt performance of PUR hot melt adhesive, it can also realize automated production and high-efficiency and low-energy consumption bonding process, thereby greatly improving the production efficiency and economic benefits of enterprises.

[0003] The Chinese PUR hot melt adhesive industry market is growing and developing. At present, the industry has formed a certain scale and brand, and the application fields involved are becoming more and more extensive, such as new energy, lithium batteries, photovoltaics, food packaging, automobiles, construction, packaging, furniture, etc. Among them, the automotive industry is the main application field of PUR hot melt adhesive, accounting for more than 30% of the industry. As society pays more and more attention to the environment, health and safety, the PUR hot melt adhesive industry will also pay more and more attention to environmental protection and health requirements, adopt more pollution-free and harmless production processes and raw materials, and promote the industry to develop in a green, environmentally friendly and sustainable direction. The PUR hot melt adhesive industry will not only be limited to the automotive industry, but will be more widely used in the fields of construction, packaging, furniture, etc. in the future, further increasing the development space and market prospects of the industry.

[0004] In order to further improve the application performance of hot melt adhesive, based on this, we proposed an environmentally friendly and high-performance PUR hot melt adhesive. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly high-performance PUR hot melt adhesive and a preparation method thereof.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0009] An environmentally friendly high-performance PUR hot melt adhesive, the preparation method of the PUR hot melt adhesive comprising:

[0010] (1) Preparation of the first prepolymer:

[0011] Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and part a of isocyanate into a reaction kettle, heat to 115-118° C., stir for 2 hours, and obtain a first prepolymer;

[0012] The isocyanate is 4,4'-diphenylmethane diisocyanate;

[0013] (2) Preparation of the second prepolymer:

[0014] Add the modified polyester polyol and part (b) of isocyanate into a reaction kettle, and heat to 110-115° C. to obtain a second prepolymer;

[0015] (3) Preparation of modified matrix:

[0016] The modified matrix is ​​prepared based on poly-alpha-olefin;

[0017] (4) Finished product preparation:

[0018] Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst are added into a reaction kettle, heated and stirred for reaction, heated to 120-125° C., and filtered to obtain the PUR hot melt adhesive;

[0019] The mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is 20:10:1-1.2:1.5:0.8.

[0020] As a further technical solution, in step (1), the isocyanate is divided into two parts, ab, wherein the mass fraction of part a is 70% and the mass fraction of part b is 30%.

[0021] As a further technical solution, in step (1), the mass ratio of the polyether polyol, polyester diol and a part of isocyanate is: 1-1.5:1.2-1.6:2.0-2.3.

[0022] As a further technical solution, in step (2), the mixed mass ratio of the modified polyester polyol and the b-part isocyanate is 1.2-1.5:1.

[0023] As a further technical solution, the modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2;

[0024] The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

[0025] As a further technical solution, the modified matrix preparation method is:

[0026] First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix.

[0027] The mixing mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:3-4:4-5.

[0028] As a further technical solution: the reinforcing filler is a nanofiller.

[0029] As a further technical solution: the method for preparing the nanofiller is:

[0030] After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution was obtained;

[0031] Among them, the mass ratio of urea to deionized water is 1:10;

[0032] Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material;

[0033] The amount of melamine added is 50% of the quality of urea;

[0034] Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

[0035] As a further technical solution: the chain extender is dimethylol propionic acid.

[0036] As a further technical solution: the catalyst is dibutyltin dilaurate.

[0037] (III) Beneficial effects

[0038] Compared with the prior art, the present invention provides an environmentally friendly high-performance PUR hot melt adhesive, which has the following beneficial effects:

[0039] The hot melt adhesive of the present invention is a solvent-free and environment-friendly adhesive, which does not release toxic organic solvents and is environmentally friendly, which meets the requirements of modern society for environmental protection and also makes it widely used in many fields.

[0040] The hot melt adhesive prepared by the present invention has good melt fluidity and high stability. At the same time, after curing, it has excellent softness, water resistance and acid and alkali resistance, and can be applied in multiple fields, so that the hot melt adhesive can still maintain a good bonding effect when used outdoors or in a humid environment.

[0041] The hot melt adhesive prepared by the present invention can adapt to various complex shapes and surfaces, ensure the firmness and reliability of bonding, and thus can perform extremely well when processing irregular or curved materials and can provide a stable bonding effect.

[0042] The invention can further improve the bonding performance of the hot melt adhesive by introducing a modified matrix in the hot melt adhesive preparation process, thereby obtaining better peel strength and significantly improving the durability.

[0043] The invention introduces nano fillers into the modified matrix and uses the nano fillers as a bridge to maintain good compatibility with the polyurethane prepolymer, which is beneficial to improving the reinforcement effect and anti-sagging property of the polyurethane hot melt adhesive system.

[0044] The hot melt adhesive prepared by the present invention can form a variety of non-covalent bond interactions with the surface of the substrate, including hydrogen bonds or metal ion coordination bonds, etc., thereby significantly improving the bonding performance of the hot melt adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart for the preparation of an environmentally friendly, high-performance PUR hot melt adhesive. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] The reactor used in the embodiment can be selected according to the actual production requirements.

[0048] 10m 3 PUR hot melt adhesive reactor: power 55kW, speed 50rpm, upper butterfly and lower ellipse, cylinder ID2300*H2250, total volume 12.5m 3 , operating volume 10m 3 , stainless steel outer half pipe 108*4 about 140m;

[0049] 8m 3 PUR hot melt adhesive reactor: power 45kW, speed 50rpm, upper butterfly and lower ellipse, cylinder ID2200*H2250, total volume 11.3m 3 , operating volume 8m 3 , stainless steel outer half pipe 108*4 about 130m;

[0050] 6m 3PUR hot melt adhesive reactor: power 37kW, speed 50rpm, upper butterfly and lower ellipse, cylinder ID2000*H2000, total volume 8.3m 3 , operating volume 6m 3 , stainless steel outer half pipe 89*4 about 116m;

[0051] 3m 3 PUR hot melt adhesive reactor: power 37kW, speed 65rpm, upper butterfly and lower ellipse, cylinder ID1500*H1800, full volume 4m 3 , operating volume 3m 3 , stainless steel outer half pipe 76*4 about 80m;

[0052] 1m 3 PUR hot melt adhesive reactor: power 22kW, speed 65rpm, upper butterfly and lower ellipse, cylinder ID1200*H1200, total volume 1.8m 3 , operating volume 1m 3 , stainless steel outer half pipe 57*3 about 60m;

[0053] Example 1

[0054] An environmentally friendly high-performance PUR hot melt adhesive, the preparation method of the PUR hot melt adhesive comprising:

[0055] (1) Preparation of the first prepolymer:

[0056] Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and a part of isocyanate into a reaction kettle, heat to 115° C., and stir for 2 hours to obtain a first prepolymer;

[0057] The isocyanate is 4,4'-diphenylmethane diisocyanate; the isocyanate is divided into two parts, ab, wherein the mass fraction of the part a is 70% and the mass fraction of the part b is 30%.

[0058] The mixing mass ratio of polyether polyol, polyester diol and a part of isocyanate is: 1:1.2:2.0.

[0059] (2) Preparation of the second prepolymer:

[0060] Add the modified polyester polyol and b parts of isocyanate into a reaction kettle, heat it to 110° C., and obtain a second prepolymer; the mixing mass ratio of the modified polyester polyol and b parts of isocyanate is 1.2:1.

[0061] The modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2;

[0062] The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

[0063] (3) Preparation of modified matrix:

[0064] The modified matrix is ​​prepared based on poly-α-olefin; the preparation method of the modified matrix is ​​as follows:

[0065] First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix.

[0066] The mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:3:4.

[0067] The reinforcing filler is a nanofiller.

[0068] The preparation method of nanofiller is as follows:

[0069] After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution was obtained;

[0070] Among them, the mass ratio of urea to deionized water is 1:10;

[0071] Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material;

[0072] The amount of melamine added is 50% of the quality of urea;

[0073] Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

[0074] (4) Finished product preparation:

[0075] Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, dimethylol propionic acid and dibutyl tin dilaurate are added into a reaction kettle, heated and stirred for reaction, heated to 120° C., and filtered to obtain the PUR hot melt adhesive;

[0076] Among them, the mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is: 20:10:1:1.5:0.8.

[0077] Example 2

[0078] An environmentally friendly high-performance PUR hot melt adhesive, the preparation method of the PUR hot melt adhesive comprising:

[0079] (1) Preparation of the first prepolymer:

[0080] Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and a part of isocyanate into a reaction kettle, heat to 116° C., and stir for 2 hours to obtain a first prepolymer;

[0081] The isocyanate is 4,4'-diphenylmethane diisocyanate; the isocyanate is divided into two parts, ab, wherein the mass fraction of the part a is 70% and the mass fraction of the part b is 30%.

[0082] The mixing mass ratio of polyether polyol, polyester diol and a part of isocyanate is: 1.2:1.5:2.1.

[0083] (2) Preparation of the second prepolymer:

[0084] Add the modified polyester polyol and b parts of isocyanate into a reaction kettle, heat it to 112° C., and obtain a second prepolymer; the mixing mass ratio of the modified polyester polyol and b parts of isocyanate is 1.3:1.

[0085] The modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2;

[0086] The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

[0087] (3) Preparation of modified matrix:

[0088] The modified matrix is ​​prepared based on poly-α-olefin; the preparation method of the modified matrix is ​​as follows:

[0089] First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix.

[0090] The mixing mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:3.5:4.2.

[0091] The reinforcing filler is a nanofiller.

[0092] The preparation method of nanofiller is as follows:

[0093] After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution was obtained;

[0094] Among them, the mass ratio of urea to deionized water is 1:10;

[0095] Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material;

[0096] The amount of melamine added is 50% of the quality of urea;

[0097] Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

[0098] (4) Finished product preparation:

[0099] Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, dimethylol propionic acid and dibutyl tin dilaurate are added into a reaction kettle, heated and stirred for reaction, heated to 122° C., and filtered to obtain the PUR hot melt adhesive;

[0100] Among them, the mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is: 20:10:1.1:1.5:0.8.

[0101] Example 3

[0102] An environmentally friendly high-performance PUR hot melt adhesive, the preparation method of the PUR hot melt adhesive comprising:

[0103] (1) Preparation of the first prepolymer:

[0104] Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and a part of isocyanate into a reaction kettle, heat to 118° C., and stir for 2 hours to obtain a first prepolymer;

[0105] The isocyanate is 4,4'-diphenylmethane diisocyanate; the isocyanate is divided into two parts, ab, wherein the mass fraction of the part a is 70% and the mass fraction of the part b is 30%.

[0106] The mixing mass ratio of polyether polyol, polyester diol and a part of isocyanate is: 1.5:1.6:2.3.

[0107] (2) Preparation of the second prepolymer:

[0108] Add the modified polyester polyol and b parts of isocyanate into a reaction kettle, heat it to 115° C., and obtain a second prepolymer; the mixing mass ratio of the modified polyester polyol and b parts of isocyanate is 1.5:1.

[0109] The modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2;

[0110] The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

[0111] (3) Preparation of modified matrix:

[0112] The modified matrix is ​​prepared based on poly-α-olefin; the preparation method of the modified matrix is ​​as follows:

[0113] First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix.

[0114] The mixing mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:4:5.

[0115] The reinforcing filler is a nanofiller.

[0116] The preparation method of nanofiller is as follows:

[0117] After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution is obtained;

[0118] Among them, the mass ratio of urea to deionized water is 1:10;

[0119] Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material;

[0120] The amount of melamine added is 50% of the quality of urea;

[0121] Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

[0122] (4) Finished product preparation:

[0123] Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, dimethylol propionic acid and dibutyl tin dilaurate are added into a reaction kettle, heated and stirred for reaction, heated to 125° C., and filtered to obtain the PUR hot melt adhesive;

[0124] Among them, the mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is: 20:10:1.2:1.5:0.8.

[0125] Example 4

[0126] An environmentally friendly high-performance PUR hot melt adhesive, the preparation method of the PUR hot melt adhesive comprising:

[0127] (1) Preparation of the first prepolymer:

[0128] Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and a part of isocyanate into a reaction kettle, heat to 117° C., and stir for 2 hours to obtain a first prepolymer;

[0129] The isocyanate is 4,4'-diphenylmethane diisocyanate; the isocyanate is divided into two parts, ab, wherein the mass fraction of the part a is 70% and the mass fraction of the part b is 30%.

[0130] The mixing mass ratio of polyether polyol, polyester diol and a part of isocyanate is: 1:1.2:2.3.

[0131] (2) Preparation of the second prepolymer:

[0132] Add the modified polyester polyol and b parts of isocyanate into a reaction kettle, heat it to 115° C., and obtain a second prepolymer; the mixing mass ratio of the modified polyester polyol and b parts of isocyanate is 1.2:1.

[0133] The modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2;

[0134] The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

[0135] (3) Preparation of modified matrix:

[0136] The modified matrix is ​​prepared based on poly-α-olefin; the preparation method of the modified matrix is ​​as follows:

[0137] First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix.

[0138] The mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:4:4.

[0139] The reinforcing filler is a nanofiller.

[0140] The preparation method of nanofiller is as follows:

[0141] After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution is obtained;

[0142] Among them, the mass ratio of urea to deionized water is 1:10;

[0143] Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material;

[0144] The amount of melamine added is 50% of the quality of urea;

[0145] Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

[0146] (4) Finished product preparation:

[0147] Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, dimethylol propionic acid and dibutyl tin dilaurate are added into a reaction kettle, heated and stirred for reaction, heated to 124° C., and filtered to obtain the PUR hot melt adhesive;

[0148] Among them, the mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is: 20:10:1.1:1.5:0.8.

[0149] The following is a comparative example:

[0150] Comparative Example 1:

[0151] On the basis of Example 1, no modified matrix is ​​added, and the rest of the technical solutions are consistent with those of Example 1.

[0152] Comparative Example 2:

[0153] On the basis of Example 1, no nanofiller is added during the preparation of the modified matrix, and the rest of the technical scheme is consistent with the technical scheme of Example 1.

[0154] test:

[0155] Peel strength: It is used to test the strength of bonding PVC plastics. The T-type peel strength test method is used in accordance with GB / T2791-1995:

[0156] Table 1

[0157] Peel strength N / mm Example 1 16.8 Example 2 17.3 Example 3 17.0 Example 4 16.5 Comparative Example 1 10.4 Comparative Example 2 13.7

[0158] It can be seen from Table 1 that the hot melt adhesive prepared by the present invention has excellent bonding performance.

[0159] Melt index test:

[0160] The samples of the embodiments and comparative examples were tested according to GB3682-2000.

[0161] Table 2

[0162]

[0163]

[0164] It can be seen from Table 2 that the hot melt adhesive prepared by the present invention has a higher melt index.

[0165] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly high-performance PUR hot melt adhesive, characterized in that: The PUR hot melt adhesive preparation method comprises: (1) Preparation of the first prepolymer: Divide isocyanate into two parts, ab, add polyether polyol, polyester diol and part a of isocyanate into a reaction kettle, heat to 115-118° C., stir for 2 hours, and obtain a first prepolymer; The isocyanate is 4,4'-diphenylmethane diisocyanate; (2) Preparation of the second prepolymer: Add the modified polyester polyol and part (b) of isocyanate into a reaction kettle, and heat to 110-115° C. to obtain a second prepolymer; (3) Preparation of modified matrix: The modified matrix is ​​prepared based on poly-alpha-olefin; (4) Finished product preparation: Under nitrogen protection, the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst are added into a reaction kettle, heated and stirred for reaction, heated to 120-125° C., and filtered to obtain the PUR hot melt adhesive; The mixing mass ratio of the first prepolymer, the second prepolymer, the modified matrix, the chain extender and the catalyst is 20:10:1-1.2:1.5:0.

8.

2. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: In step (1), the isocyanate is divided into two parts, ab, wherein the mass fraction of the part a is 70% and the mass fraction of the part b is 30%.

3. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: In step (1), the mixing mass ratio of polyether polyol, polyester diol and a part of isocyanate is: 1-1.5:1.2-1.6:2.0-2.

3.

4. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: In step (2), the mixed mass ratio of the modified polyester polyol and the part (b) of isocyanate is 1.2-1.5:

1.

5. The environmentally friendly high-performance PUR hot melt adhesive according to claim 4, characterized in that: The modified polyester polyol is prepared by polycondensation of adipic acid, sebacic acid and 1,4-butanediol in a molar ratio of 1:1:2; The hydroxyl value of the modified polyester polyol is 58 mg KOH / g.

6. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: The modified matrix preparation method is: First, α-olefin was completely melted at 158°C, and then diisopropylbenzene peroxide was added, and the mixture was stirred for 10 minutes, and then vinyl triethoxysilane and reinforcing filler were added, and the mixture was stirred at a constant temperature for 30 minutes to obtain a modified matrix. The mixing mass ratio of the alpha-olefin, dicumyl peroxide, vinyl triethoxysilane and reinforcing filler is 30:0.5:3-4:4-5.

7. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: The reinforcing filler is a nanofiller.

8. The environmentally friendly high-performance PUR hot melt adhesive according to claim 7, characterized in that: The nanofiller preparation method is: After mixing hydroxylamine hydrochloride and urea in a mass ratio of 2:1, adding the mixture into deionized water, stirring and mixing for 10 minutes, a mixed solution was obtained; Among them, the mass ratio of urea to deionized water is 1:10; Add melamine to the mixed solution, adjust the temperature to 120°C, keep the mixture warm for 10 hours, then filter, wash and dry to obtain an intermediate material; The amount of melamine added is 50% of the quality of urea; Place the intermediate material in a boiling furnace, adjust the temperature to 550°C, keep it warm for 40 minutes, and cool it to room temperature to obtain the nano filler.

9. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: The chain extender is dimethylol propionic acid.

10. The environmentally friendly high-performance PUR hot melt adhesive according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate.

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