阅读说明：本技术 一种锂电铝塑膜用双组分聚氨酯粘合剂 (Bi-component polyurethane adhesive for lithium battery aluminum plastic film ) 是由 张国荣 杨春 于 2021-10-11 设计创作，主要内容包括：一种锂电铝塑膜用双组分粘合剂,用于解决现有粘合剂在使其具备阻燃性的同时其流平性也满足需求的技术问题。包括A组分和B组分,所述B组分为异氰酸酯预聚体,所述A组分中的羟基与所述B组分中的异氰酸酯的摩尔比为0.92～1.0,其中A组分中的阻燃剂选用苯基磷酸二(乙二醇)酯,该阻燃剂中的羟基可与A组分中的聚酯多元醇、聚醚酯多元醇以及多异氰酸酯单体结合形成稳定的具备阻燃效果的大分子体系,且该阻燃剂还可以和铝塑膜的尼龙基材以及β-环糊精形成膨胀型阻燃剂的三大体系,综合提高粘合剂的阻燃性,且A组分中的芳香族超支化聚酯具备流平性,从而保证粘合剂在使用过程中既不会出现分层的问题也具有阻燃性；本发明主要用于聚氨酯粘合剂技术领域。(A two-component adhesive for a lithium battery aluminum plastic film is used for solving the technical problem that the leveling property of the existing adhesive meets the requirement while the existing adhesive has flame retardance. The flame retardant is characterized by comprising a component A and a component B, wherein the component B is an isocyanate prepolymer, the molar ratio of hydroxyl in the component A to isocyanate in the component B is 0.92-1.0, a flame retardant in the component A is phenyl di (ethylene glycol) phosphate, the hydroxyl in the flame retardant can be combined with polyester polyol, polyether ester polyol and a polyisocyanate monomer in the component A to form a stable macromolecular system with a flame retardant effect, the flame retardant can also form three systems of an intumescent flame retardant with nylon base materials of an aluminum plastic film and beta-cyclodextrin, the flame retardance of the adhesive is comprehensively improved, and the aromatic hyperbranched polyester in the component A has leveling property, so that the adhesive is ensured not to have the problem of layering and has flame retardance in the using process; the invention is mainly used in the technical field of polyurethane adhesives.)

1. The double-component polyurethane adhesive for the lithium battery aluminum plastic film is characterized by comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 100: 10-20; the component A comprises the following raw materials in parts by weight:

25-35 parts of polyester polyol;

8-15 parts of polyether ester polyol;

4-12 parts of a polyisocyanate monomer;

3-5 parts of epoxy resin;

2-3 parts of a flame retardant;

0.2-0.8 part of aromatic hyperbranched polyester;

0.5-1 part of a chain extender;

0.01-0.05 part of a catalyst;

0.1-0.3 part of an auxiliary agent;

40-60 parts of a solvent;

1-1.5 parts of beta-cyclodextrin;

the flame retardant is: phenyl di (ethylene glycol) phosphate;

the polyether ester polyol comprises at least two components, wherein one component is polypropylene carbonate diol, and the other component is one or more of polyoxypropylene diol, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerized diol;

the component B is an isocyanate prepolymer, and the molar ratio of hydroxyl in the component A to isocyanate in the component B is 0.92-1.0.

2. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film as claimed in claim 1, wherein the isocyanate prepolymer is one or a mixture of 2,4-TDI trimer and 2,6-TDI trimer.

3. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film according to claim 1, wherein the polyisocyanate monomer is one or a combination of toluene diisocyanate and diphenylmethane-4, 4' -diisocyanate.

4. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film according to claim 1, wherein the polyester polyol has a functionality of 2.2-2.5, a molecular weight of 10000-20000, a water content of less than 300ppm, and an acid value of less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

5. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film as claimed in claim 1, wherein the chain extender is one or a combination of 1, 4-butanediol and trimethylolpropane.

6. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film according to claim 5, wherein the catalyst is one or more of stannous octoate, triethylenediamine and bis-morpholinyl diethyl ether.

7. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film according to claim 1, wherein the epoxy resin is one or a combination of a polyurethane-modified epoxy resin and a polyether-modified epoxy resin.

8. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film of claim 1, wherein the auxiliary agent is one or a combination of two of a silane coupling agent KH-550 and a silane coupling agent G-570.

9. The two-component polyurethane adhesive for the lithium-ion aluminum plastic film according to claim 1, wherein the solvent is one or a combination of ethyl acetate and dimethyl carbonate.

10. The preparation method of the two-component polyurethane adhesive for the lithium-ion battery aluminum plastic film according to any one of claims 1 to 9, characterized by comprising the following steps:

s1, adding the polyester polyol and the polyether ester polyol into a reaction kettle according to the proportion, heating to 110-130 ℃, and removing water for 2-3 h under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding a polyisocyanate monomer, a chain extender, a flame retardant, a catalyst and a solvent in proportion into a reaction kettle, heating to 70-90 ℃, and reacting for 2-4 hours to obtain a polyurethane prepolymer;

s3: adding hyperbranched aromatic polyester powder, continuously stirring for 1-2 hours, then adding epoxy resin and an auxiliary agent into the reaction kettle according to the proportion, stirring for 0.5-1 hour, finally adding beta-cyclodextrin according to the proportion, and adjusting the solid content to 40% -60% to obtain the component A;

and S4, adding the component B into the component A according to the proportion, adjusting the solid content to 35-55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Technical Field

The invention relates to the technical field of polyurethane adhesives, in particular to a double-component polyurethane adhesive for a lithium battery aluminum plastic film.

Background

The soft package battery has the comprehensive advantages of flexible design, light weight, small internal resistance, difficult explosion and the like, and is widely applied to the fields of new energy automobiles, 3C consumer electronic products and the like.

As one of important structures of a soft package battery, an aluminum plastic film needs to ensure the safety of the soft package battery in the use process, and specifically, the aluminum plastic film plays a role in protecting an inner core of the battery on one hand, and also needs to have chemical stability, insulativity, puncture resistance and the like on the other hand; aluminum-plastic films typically include, from the outside to the inside, a nylon layer bonded by an adhesive, an aluminum foil layer, and a heat seal layer.

The adhesive used for the aluminum plastic film has good adhesiveness, and simultaneously needs to have high temperature resistance, good heat conducting property and insulativity and flame retardance, and the existing publication number is CN 110184016A; however, the flame retardant property of the additive with the flame retardant effect comes from the additive, namely the additive belongs to an unreactive flame retardant, under the condition of high temperature, the additive is in an unstable state in the adhesive, so that the flame retardant property of the adhesive is also unstable, and the leveling property of the adhesive is influenced while the flame retardant property of the adhesive is improved by adding the hydroxyl-containing phosphorus flame retardant into the modified isocyanate prepolymer, so that the adhesive is not uniformly bonded, and the aluminum plastic film is layered in the using process.

Therefore, how to make the adhesive have flame retardance and ensure that the leveling property of the adhesive meets the requirement is one aspect of improving the comprehensive performance of the adhesive.

Disclosure of Invention

The invention aims to provide a two-component adhesive for a lithium battery aluminum plastic film, aiming at overcoming the defects of the prior art and solving the technical problem that the leveling property of the conventional adhesive meets the requirement while the conventional adhesive has flame retardance.

In order to achieve the purpose, the invention adopts the following technical scheme:

the double-component polyurethane adhesive for the lithium battery aluminum plastic film comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 100: 10-20; the component A comprises the following raw materials in parts by weight:

25-35 parts of polyester polyol;

8-15 parts of polyether ester polyol;

4-12 parts of a polyisocyanate monomer;

3-5 parts of epoxy resin;

2-3 parts of a flame retardant;

0.2-0.8 part of aromatic hyperbranched polyester;

0.5-1 part of a chain extender;

0.01-0.05 part of a catalyst;

0.1-0.3 part of an auxiliary agent;

40-60 parts of a solvent;

1-1.5 parts of beta-cyclodextrin;

the flame retardant is: phenyl di (ethylene glycol) phosphate;

the polyether ester polyol comprises at least two components, wherein one component is polypropylene carbonate diol, and the other component is one or a composition of more than one of polyoxypropylene diol, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerized diol;

the component B is an isocyanate prepolymer, and the molar ratio of hydroxyl in the component A to isocyanate in the component B is 0.92-1.0.

Further, the isocyanate prepolymer is one or a mixture of 2,4-TDI trimer and 2,6-TDI trimer.

Further, the polyisocyanate monomer is one or a combination of toluene diisocyanate and diphenylmethane-4, 4' -diisocyanate.

Further, the functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

Further, the chain extender is one or a combination of 1, 4-butanediol and trimethylolpropane.

Further, the catalyst is one or a composition of more than one of stannous octoate, triethylene diamine and dimorpholinyl diethyl ether.

Furthermore, the epoxy resin is one or a combination of polyurethane modified epoxy resin and polyether modified epoxy resin.

Furthermore, the auxiliary agent is one or a combination of two of a silane coupling agent KH-550 and a silane coupling agent G-570.

Further, the solvent is one or a combination of ethyl acetate and dimethyl carbonate.

The preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film is characterized by comprising the following steps of:

s1, adding the polyester polyol and the polyether ester polyol into a reaction kettle according to the proportion, heating to 110-130 ℃, and removing water for 2-3 h under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding a polyisocyanate monomer, a chain extender, a flame retardant, a catalyst and a solvent in proportion into a reaction kettle, heating to 70-90 ℃, and reacting for 2-4 hours to obtain a polyurethane prepolymer;

s3: adding hyperbranched aromatic polyester powder, continuously stirring for 1-2 hours, then adding epoxy resin and an auxiliary agent into the reaction kettle according to the proportion, stirring for 0.5-1 hour, finally adding beta-cyclodextrin according to the proportion, and adjusting the solid content to 40% -60% to obtain the component A;

and S4, adding the component B into the component A according to the proportion, adjusting the solid content to 35-55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

The invention has the beneficial effects that:

the invention discloses a two-component adhesive for a lithium battery aluminum plastic film, which comprises a component A and a component B, wherein a flame retardant in the component A is phenyl di (ethylene glycol) phosphate, hydroxyl in the flame retardant can be combined with polyester polyol, polyether ester polyol and polyisocyanate monomer in the component A to form a stable macromolecular system with a flame retardant effect, namely the flame retardant belongs to a reactive flame retardant, the macromolecular system is still in a stable state under a high temperature condition so as to ensure the flame retardant effect of the adhesive, a nylon base material in the aluminum plastic film can form a three-system of an intumescent flame retardant with beta-cyclodextrin and phenyl di (ethylene glycol) phosphate in the adhesive to further improve the flame retardant of the adhesive, and polypropylene carbonate glycol in the polyether ester polyol can also decompose a large amount of carbon dioxide to prevent combustion, meanwhile, the aromatic hyperbranched polyester is added into the adhesive, so that the adhesive has better leveling property, and the adhesive is ensured not to have the problem of delamination in the use process and has flame retardance.

Detailed Description

The technical solution of the present invention is further illustrated by the following examples.

Example 1

25kg of polyester polyol;

4kg of polypropylene carbonate glycol;

4kg of polyoxypropylene glycol;

4kg of toluene diisocyanate;

3kg of polyurethane modified epoxy resin;

2kg of phenyl phosphoric acid di (ethylene glycol) ester;

0.2kg of aromatic hyperbranched polyester;

0.5kg of 1, 4-butanediol;

0.01kg of stannous octoate;

KH-5500.1 kg of silane coupling agent;

40kg of ethyl acetate;

1kg of beta-cyclodextrin.

The mass ratio of the component A to the component B is 100: 10.

the component B was 2,4-TDI trimer having a mass of 8.38 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component was 0.92.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 25kg of polyester polyol, 4kg of polypropylene carbonate glycol and 4kg of polyoxypropylene glycol into a reaction kettle together, heating to 110 ℃, and removing water for 2 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 4kg of toluene diisocyanate, 0.5kg of 1, 4-butanediol, 2kg of phenyl phosphoric acid di (ethylene glycol) ester, 0.01kg of stannous octoate and 40kg of ethyl acetate into a reaction kettle, heating to 70 ℃, and reacting for 2 hours to obtain a polyurethane prepolymer;

s3: adding 0.2kg of hyperbranched aromatic polyester powder, continuously stirring for 1h, then adding 3kg of polyurethane modified epoxy resin and 0.1kg of silane coupling agent KH-550 into a reaction kettle, stirring for 0.5h, finally adding 1kg of beta-cyclodextrin, and adjusting the solid content to 40% to obtain a component A;

s4: adding 8.38kg of 2,4-TDI trimer into the component A, adjusting the solid content to 35%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Example 2

35kg of polyester polyol;

8kg of polypropylene carbonate glycol;

7kg of polyoxypropylene diol;

12kg of toluene diisocyanate;

5kg of polyurethane modified epoxy resin;

3kg of phenyl phosphoric acid di (ethylene glycol) ester;

0.8kg of aromatic hyperbranched polyester;

1kg of 1, 4-butanediol;

0.05kg of stannous octoate;

KH-5500.3 kg of silane coupling agent;

60kg of ethyl acetate;

1.5kg of beta-cyclodextrin.

The mass ratio of the component A to the component B is 100: 20.

the component B was 2,4-TDI trimer having a mass of 26.73 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component is 1.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 35kg of polyester polyol, 8kg of polypropylene carbonate glycol and 7kg of polyoxypropylene diol into a reaction kettle, heating to 130 ℃, and removing water for 3 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 12kg of toluene diisocyanate, 1kg of 1, 4-butanediol, 3kg of phenyl phosphoric acid di (ethylene glycol ester), 0.05kg of stannous octoate and 60kg of ethyl acetate into a reaction kettle, heating to 90 ℃, and reacting for 4 hours to obtain a polyurethane prepolymer;

s3: then, continuously stirring 0.8kg of aromatic hyperbranched polyester for 2 hours on the basis of the step 2, then adding 5kg of polyurethane modified epoxy resin and 0.3kg of silane coupling agent KH-550 into the reaction kettle, stirring for 1 hour, finally adding 1.5kg of beta-cyclodextrin, and adjusting the solid content to 60% to obtain a component A;

s4: adding 26.73kg of 2,4-TDI trimer into the component A, adjusting the solid content to 55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Example 3

30kg of polyester polyol;

6kg of polypropylene carbonate glycol;

6kg of polyoxypropylene glycol;

8kg of toluene diisocyanate;

4kg of polyurethane modified epoxy resin;

2.5kg of phenyl phosphoric acid di (ethylene glycol) ester;

0.5kg of aromatic hyperbranched polyester;

0.8kg of 1, 4-butanediol;

0.03kg of stannous octoate;

KH-5500.2 kg of silane coupling agent;

50kg of ethyl acetate;

1.3kg of beta-cyclodextrin.

The mass ratio of the component A to the component B is 100: 15.

the component B was 2,4-TDI trimer having a mass of 16.40 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component was 0.95.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 30kg of polyester polyol, 6kg of polypropylene carbonate glycol and 6kg of polyoxypropylene diol into a reaction kettle, heating to 130 ℃, and removing water for 2.5 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 8kg of toluene diisocyanate, 0.8kg of 1, 4-butanediol, 0.03kg of stannous octoate and 50kg of ethyl acetate into a reaction kettle, heating to 85 ℃, and reacting for 3 hours to obtain a polyurethane prepolymer;

s3: then continuing to stir 0.5kg of aromatic hyperbranched polyester for 1.5h on the basis of the step 2, adding 4kg of polyurethane modified epoxy resin and 0.2kg of silane coupling agent KH-550 into the reaction kettle, stirring for 0.8h, finally adding 1.3kg of beta-cyclodextrin, and adjusting the solid content to 52% to obtain a component A;

s4: adding 16.40kg of 2,4-TDI trimer into the component A, adjusting the solid content to 45%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Example 4

35kg of polyester polyol;

6kg of polypropylene carbonate glycol;

5kg of polyoxypropylene diol;

4kg of polytetrahydrofuran diol;

6kg of toluene diisocyanate;

6kg of diphenylmethane-4, 4' -diisocyanate;

3kg of polyurethane modified epoxy resin;

2kg of polyether modified epoxy resin;

3kg of phenyl phosphoric acid di (ethylene glycol) ester;

aromatic hyperbranched polyester 0.8kg

0.5kg of 1, 4-butanediol;

0.5kg of trimethylolpropane;

0.03kg of stannous octoate;

0.02kg of triethylene diamine;

KH-5500.2 kg of silane coupling agent;

silane coupling agent G-5700.1 kg;

30kg of ethyl acetate;

30kg of dimethyl carbonate;

1.5kg of beta-cyclodextrin.

The mass ratio of the component A to the component B is 100: 20.

the component B comprises 2,4-TDI trimer and 2,6-TDI trimer, wherein the 2,4-TDI trimer is 13.37kg, and the 2,6-TDI trimer is 13.36 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component is 1.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 35kg of polyester polyol, 6kg of polypropylene carbonate glycol, 5kg of polyoxypropylene diol and 4kg of polytetrahydrofuran diol into a reaction kettle, heating to 130 ℃, and removing water for 3 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 6kg of toluene diisocyanate, 6kg of diphenylmethane-4, 4' -diisocyanate, 0.5kg of 1, 4-butanediol, 0.5kg of trimethylolpropane, 3kg of phenyl phosphoric acid di (ethylene glycol ester), 0.03kg of stannous octoate, 0.02kg of triethylene diamine, 30kg of ethyl acetate and 30kg of dimethyl carbonate into a reaction kettle, heating to 90 ℃, and reacting for 4 hours to obtain a polyurethane prepolymer;

s3: then, continuously stirring 0.8kg of aromatic hyperbranched polyester for 2 hours on the basis of the step 2, then adding 3kg of polyurethane modified epoxy resin, 2kg of polyether modified epoxy resin, 0.2kg of silane coupling agent KH-550 and 0.1kg of silane coupling agent G-570 into a reaction kettle, stirring for 1 hour, finally adding 1.5kg of beta-cyclodextrin, and adjusting the solid content to 60% to obtain a component A;

s4: adding 13.37kg of 2,4-TDI trimer and 13.36kg of 2,6-TDI trimer into the component A, adjusting the solid content to 55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Example 5

30kg of polyester polyol;

3kg of polypropylene carbonate glycol;

3kg of polyoxypropylene glycol;

3kg of polytetrahydrofuran diol;

3kg of tetrahydrofuran-propylene oxide copolymerized glycol;

8kg of toluene diisocyanate;

4kg of polyurethane modified epoxy resin;

2.5kg of phenyl phosphoric acid di (ethylene glycol) ester;

0.5kg of aromatic hyperbranched polyester;

0.8kg of 1, 4-butanediol;

0.01kg of stannous octoate;

0.01kg of triethylenediamine

Dimorpholinyl diethyl ether 0.01kg

KH-5500.2 kg of silane coupling agent;

30kg of ethyl acetate;

20kg of dimethyl carbonate;

1.3kg of beta-cyclodextrin.

The mass ratio of the component A to the component B is 100: 15.

the component B, 2,6-TDI trimer, had a mass of 16.40 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component was 0.95.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 30kg of polyester polyol, 3kg of polypropylene carbonate glycol, 3kg of polyoxypropylene diol, 3kg of polytetrahydrofuran diol and 3kg of tetrahydrofuran-propylene oxide copolymerized diol into a reaction kettle, heating to 120 ℃, and removing water for 2.5 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 8kg of toluene diisocyanate, 0.8kg of 1, 4-butanediol, 2.5kg of phenyl phosphoric acid bis (ethylene glycol ester), 0.01kg of stannous octoate, 0.01kg of triethylene diamine, 0.01kg of dimorpholinyl diethyl ether, 30kg of ethyl acetate and 20kg of dimethyl carbonate into a reaction kettle, heating to 85 ℃, and reacting for 3 hours to obtain a polyurethane prepolymer;

s3: then continuing to stir 0.5kg of aromatic hyperbranched polyester for 1.5h on the basis of the step 2, adding 4kg of polyurethane modified epoxy resin and 0.2kg of silane coupling agent KH-550 into the reaction kettle, stirring for 0.8h, finally adding 1.3kg of beta-cyclodextrin, and adjusting the solid content to 52% to obtain a component A;

s4: adding 16.40kg of 2,6-TDI trimer into the component A, adjusting the solid content to 45%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Comparative example 1

35kg of polyester polyol;

8kg of polypropylene carbonate glycol;

7kg of polyoxypropylene diol;

12kg of toluene diisocyanate;

5kg of polyurethane modified epoxy resin;

3kg of phenyl phosphoric acid di (ethylene glycol) ester;

1kg of 1, 4-butanediol;

0.05kg of stannous octoate;

KH-5500.3 kg of silane coupling agent;

60kg of ethyl acetate;

1.5kg of beta-cyclodextrin;

the mass ratio of the component A to the component B is 100: 20.

the component B was 2,4-TDI trimer having a mass of 26.57 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component is 1.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 35kg of polyester polyol, 8kg of polypropylene carbonate glycol and 7kg of polyoxypropylene diol into a reaction kettle, heating to 130 ℃, and removing water for 3 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 12kg of toluene diisocyanate, 1kg of 1, 4-butanediol, 3kg of phenyl phosphoric acid di (ethylene glycol ester), 0.05kg of stannous octoate and 60kg of ethyl acetate into a reaction kettle, heating to 90 ℃, and reacting for 4 hours to obtain a polyurethane prepolymer;

s3: then adding 5kg of polyurethane modified epoxy resin and 0.3kg of silane coupling agent KH-550 into a reaction kettle on the basis of the step 2, stirring for 1h, finally adding 1.5kg of beta-cyclodextrin, and adjusting the solid content to 60% to obtain a component A;

s4: adding 26.57kg of 2,4-TDI trimer into the component A, adjusting the solid content to 55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

Comparative example 2

35kg of polyester polyol;

8kg of polypropylene carbonate glycol;

7kg of polyoxypropylene diol;

12kg of toluene diisocyanate;

5kg of polyurethane modified epoxy resin;

3kg of phenyl phosphoric acid di (ethylene glycol) ester;

0.8kg of aromatic hyperbranched polyester;

1kg of 1, 4-butanediol;

0.05kg of stannous octoate;

KH-5500.3 kg of silane coupling agent;

60kg of ethyl acetate.

The mass ratio of the component A to the component B is 100: 20.

the component B was 2,4-TDI trimer having a mass of 26.43 kg.

The molar ratio of hydroxyl in the A component to isocyanate in the B component is 1.

The functionality of the polyester polyol is 2.2-2.5, the molecular weight is 10000-20000, the water content is less than 300ppm, and the acid value is less than 1 mgKOH/g; the polyester polyol contains a polyester polyol having a glass transition temperature of-10 ℃ or higher.

The embodiment of the invention also provides a preparation method of the double-component polyurethane adhesive for the lithium battery aluminum plastic film, which comprises the following steps:

a preparation method of a double-component polyurethane adhesive for a lithium battery aluminum plastic film comprises the following steps:

s1, adding 35kg of polyester polyol, 8kg of polypropylene carbonate glycol and 7kg of polyoxypropylene diol into a reaction kettle, heating to 130 ℃, and removing water for 3 hours under the condition that the vacuum degree is less than 0.1 MPa; stopping water removal when the water content is below 300 ppm;

s2: cooling to below 60 ℃, adding 12kg of toluene diisocyanate, 1kg of 1, 4-butanediol, 3kg of phenyl phosphoric acid di (ethylene glycol ester), 0.05kg of stannous octoate and 60kg of ethyl acetate into a reaction kettle, heating to 90 ℃, and reacting for 4 hours to obtain a polyurethane prepolymer;

s3: then, continuously stirring 0.8kg of aromatic hyperbranched polyester for 2 hours on the basis of the step 2, adding 5kg of polyurethane modified epoxy resin and 0.3kg of silane coupling agent KH-550 into the reaction kettle, and adjusting the solid content to 60% to obtain a component A;

s4: adding 26.43kg of 2,4-TDI trimer into the component A, adjusting the solid content to 55%, and uniformly stirring to obtain the two-component polyurethane adhesive for the lithium battery aluminum plastic film.

The 7 two-component polyurethane adhesives prepared according to the above examples 1, 2, 3, 4, 5, and 1, 2 were respectively subjected to leveling tests, and the 7 two-component polyurethane adhesives were respectively coated on the same nylon substrate and subjected to flame retardancy tests using standard tests for flame retardancy of plastics, wherein the leveling tests were performed by taking 0.2g of each of the 7 adhesives in a standard test chamber, dropping 7 sets of 0.2g of the adhesive on a rectangular plate made of PA and having a size of 25mm × 60mm and rotating to be vertical, recording the maximum flow distance for 1min, performing several sets of parallel tests and averaging, then judging the leveling of the 7 two-component polyurethane adhesives using the average value, judging the flame retardancy of the 7 two-component polyurethane adhesives using whether or not to burn and the duration of burning, and the following experimental data are obtained in a summary way:

according to the embodiment 2 and the comparative example 1, the variable is whether the aromatic hyperbranched polyester is used, and according to the experimental data, the adhesive of the embodiment 2 containing the aromatic hyperbranched polyester has better leveling property.

According to the embodiment 2 and the comparative example 2, the variable is whether beta-cyclodextrin is used, and according to the experimental data, the adhesive of the embodiment 2 containing beta-cyclodextrin has better flame retardant effect.

The two-component polyurethane adhesives prepared in examples 1-5 have slightly different leveling and flame retardancy, but all meet the requirements of leveling and flame retardancy of the adhesives.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.