High-elasticity two-component PU (polyurethane) adhesive

Abstract

The invention discloses a high-elasticity two-component PU (polyurethane) adhesive, and belongs to the technical field of hot melt adhesives, the high-elasticity two-component PU adhesive comprises an adhesive component A and a curing agent component B. The adhesive component A comprises polyether polyol, polyester polyol, a micromolecule chain extension crosslinking agent, a catalyst, a stabilizer and a filler, and the curing agent component B comprises a curing agent component C and a curing agent component B. The curing agent component C comprises polyether polyol, polyester polyol, a micromolecule chain extension crosslinking agent, a catalyst, a stabilizer and a filler. The curing agent B component comprises polyisocyanate, toluene diisocynate and diisocyanate, the polyether polyol and the polyester polyol form a soft chain segment, the polyisocyanate, the toluene diisocynate and the diisocyanate form a hard chain segment, and the curing agent B component comprises polyether polyol, toluene diisocynate and diisocyanate. The micromolecular chain extension cross-linking agent promotes the polyether polyol and the polyester polyol to have a cross-linking reaction with the polyisocyanate, the toluene diisocynate and the diisocyanate to form an elastic connection structure. According to the invention, the finally formed adhesion layer has good elasticity, the stability of the adhesion layer is guaranteed, and the risk of breaking or breaking of the adhesion layer is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesives, and more specifically to a high-elastic two-component PU adhesive. Background Art

[0002] Adhesives are mainly divided into two categories: single-component and multi-component. Multi-component adhesives are chemical products that have a curing agent and a main agent separated. When used, the two are mixed evenly to tightly bond the materials that need to be bonded together. Adhesives are widely used in manufacturing, medicine, decoration, mobile electronic products, and automobiles.

[0003] The adhesive commonly used in the market at present will form a hard adhesive layer between the two structures after bonding the two structures. This adhesive layer has poor elasticity. When the structure using this adhesive vibrates or shakes, the risk of the adhesive layer breaking or rupturing increases.

[0004] Therefore, in view of this, the existing structure is studied and improved to provide a highly elastic two-component PU adhesive in order to achieve a more practical purpose. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a highly elastic two-component PU adhesive, which can make the finally formed adhesive layer have better elasticity, ensure the stability of the adhesive layer, and effectively reduce the risk of the adhesive layer being broken or fractured when the structure using this two-component PU adhesive vibrates or shakes.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A highly elastic two-component PU adhesive, the hot melt adhesive is composed of an adhesive component A and a curing agent component B, wherein the adhesive component A comprises polyether polyol, polyester polyol, small molecule chain extender crosslinking agent, catalyst, stabilizer and filler, and the curing agent component B comprises polyisocyanate, toluene diisocyanate and diisocyanate;

[0010] The raw materials of adhesive component A are as follows by weight:

[0011]

[0012] The raw materials of curing agent component B are as follows by mass:

[0013] Polyisocyanate 80-145 parts

[0014] Toluene diisocyanate 80-145 parts

[0015] 80-145 parts of diisocyanate

[0016] Among them, polyether polyols and polyester polyols form soft segments, polyisocyanates, toluene diisocyanate and diisocyanate form hard segments, and small molecule chain extenders and cross-linkers promote the cross-linking reaction of polyether polyols, polyester polyols with polyisocyanates, toluene diisocyanate and diisocyanate to form an elastic connection structure of hard segments and soft segments.

[0017] Furthermore, the catalyst is selected from one or more of 4,4-dimethylaniline, triethanolamine and 6,6-dimethylcyclohexylamine.

[0018] Further, the stabilizer includes an antioxidant and a UV absorber;

[0019] The antioxidant is selected from either Finox L-11 or PUB-380;

[0020] The ultraviolet absorber can be any one of UV-1051 and UV-1 (101).

[0021] Further, the filler includes silicate and alumina.

[0022] Furthermore, the adhesive component A comprises 220 parts of polyether polyol, 220 parts of polyester polyol, 38 parts of small molecule chain extender crosslinker, 4 parts of catalyst, 4 parts of stabilizer, and 6 parts of filler in a total of 492 parts by mass.

[0023] Furthermore, the curing agent component B is selected from 82 parts of polyisocyanate, 82 parts of toluene diisocyanate, and 82 parts of diisocyanate in terms of mass fraction, with a total mass fraction of 246 parts.

[0024] Furthermore, the adhesive component A and the curing agent component B are stored in relatively sealed aluminum alloy cans, and sampling and testing ports are provided on the aluminum alloy cans.

[0025] Furthermore, the adhesive component A and the curing agent component B are stored at a temperature not higher than 15°C;

[0026] The humidity range of adhesive component A and curing agent component B during storage is between 55% and 75% RH.

[0027] Furthermore, the elasticity test methods of two-component PU adhesive include tensile test, compression test, hardness test, rebound test, and wear test;

[0028] Among them, the tensile test of two-component PU adhesive was carried out by a universal material testing machine;

[0029] Perform compression test on two-component PU adhesive using compression testing machine;

[0030] Use Shore or Rockwell hardness tester to test the hardness of two-component PU adhesive;

[0031] Conduct rebound test of two-component PU adhesive using rebound tester;

[0032] The wear resistance test of two-component PU adhesive is carried out using a wear resistance testing machine.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the advantages of the present invention are:

[0035] This solution uses this two-component PU glue as an adhesive. In this two-component PU glue, polyether polyols and polyester polyols form soft segments, polyisocyanates, toluene diisocyanates and diisocyanates form hard segments, and small molecule chain extenders promote cross-linking reactions between polyether polyols, polyester polyols and polyisocyanates, toluene diisocyanates and diisocyanates to form an elastic connection structure of hard segments and soft segments. At the same time, the use of catalysts can shorten the curing time, the use of stabilizers can enhance the weather resistance and chemical stability of PU glue and extend its service life, and the use of fillers can increase the viscosity and viscosity of the glue, thereby improving the bonding strength and sealing performance of the glue. When this two-component PU glue is used as an adhesive, the final formed adhesive layer has good elasticity, which ensures the stability of the adhesive layer, and effectively reduces the risk of the adhesive layer breaking or rupture when the structure using this two-component PU glue vibrates or shakes. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the solutions in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] A highly elastic two-component PU adhesive, the hot melt adhesive is composed of an adhesive component A and a curing agent component B, wherein the adhesive component A comprises polyether polyol, polyester polyol, small molecule chain extender crosslinking agent, catalyst, stabilizer and filler, and the curing agent component B comprises polyisocyanate, toluene diisocyanate and diisocyanate;

[0039] The raw materials of adhesive component A are as follows by weight:

[0040] Polyether polyols 220~260 servings Polyester polyols 20~260 servings Small molecule chain extender crosslinker 35~48 servings catalyst 3-6 servings Stabilizer 2-6 servings filler 3-8 servings

[0041] The raw materials of curing agent component B are as follows by mass:

[0042] Polyisocyanate 80~145 servings Toluene diisocyanate 80~145 servings Diisocyanates 80~145 servings

[0043] Among them, polyether polyols and polyester polyols form soft segments, polyisocyanates, toluene diisocyanate and diisocyanate form hard segments, and small molecule chain extenders and cross-linkers promote the cross-linking reaction of polyether polyols, polyester polyols with polyisocyanates, toluene diisocyanate and diisocyanate to form an elastic connection structure of hard segments and soft segments.

[0044] Embodiment 2:

[0045] Based on the above embodiment 1, further description is given.

[0046] Specifically, the catalyst is selected from one or more of 4,4-dimethylaniline, triethanolamine and 6,6-dimethylcyclohexylamine.

[0047] These catalysts are common in the production of polyurethane foams and speed up the reaction of isocyanates and polyols, thereby shortening the curing time.

[0048] Specifically, the stabilizer includes antioxidants and ultraviolet absorbers;

[0049] The antioxidant is selected from either Finox L-11 or PUB-380;

[0050] The ultraviolet absorber can be any one of UV-1051 and UV-1 (101).

[0051] Antioxidants can effectively delay the aging process of PU glue and prevent it from deteriorating due to oxidation during use. UV absorbers can absorb ultraviolet rays to prevent PU glue from turning yellow and cracking due to exposure to sunlight. Antiaging agents are used to enhance the weather resistance and chemical stability of PU glue and extend its service life.

[0052] Specifically, the filler includes silicate and alumina.

[0053] This can increase the viscosity and stickiness of the glue, making it more suitable for filling and sealing, and can fill tiny grooves and pores on the surface of the material, improving the bonding strength and sealing performance of the glue.

[0054] Specifically, the adhesive component A comprises 220 parts of polyether polyol, 220 parts of polyester polyol, 38 parts of small molecule chain extender crosslinker, 4 parts of catalyst, 4 parts of stabilizer, and 6 parts of filler in a total of 492 parts by mass.

[0055] Specifically, the curing agent component B is selected from 82 parts of polyisocyanate, 82 parts of toluene diisocyanate, and 82 parts of diisocyanate in terms of mass fraction, with a total mass fraction of 246 parts.

[0056] Ensure that the ratio of adhesive component A to curing agent component B is between (2:1) and (1:1).

[0057] Specifically, the adhesive component A and the curing agent component B are stored in relatively sealed aluminum alloy cans, and sampling and testing ports are provided on the aluminum alloy cans.

[0058] By taking samples regularly, ensure that the adhesive component A and the curing agent component B are in effective condition before mixing.

[0059] Specifically, the adhesive component A and the curing agent component B are stored at a temperature not higher than 15°C;

[0060] The humidity range of adhesive component A and curing agent component B during storage is between 55% and 75% RH.

[0061] Control the temperature and humidity to prevent the quality of adhesive component A and curing agent component B from decreasing due to environmental factors, thereby ensuring the quality of the final mixed two-component PU adhesive.

[0062] Embodiment 3:

[0063] Based on the above-mentioned Embodiment 1 and Embodiment 2, further description is given.

[0064] Specifically, the elasticity test methods of two-component PU adhesive include tensile test, compression test, hardness test, rebound test, and wear test;

[0065] Among them, the tensile test of two-component PU adhesive was carried out by a universal material testing machine;

[0066] Perform compression test on two-component PU adhesive using compression testing machine;

[0067] Use Shore or Rockwell hardness tester to test the hardness of two-component PU adhesive;

[0068] Conduct rebound test of two-component PU adhesive using rebound tester;

[0069] The wear resistance test of two-component PU adhesive is carried out using a wear resistance testing machine.

[0070] The above-mentioned test methods can reflect the elastic properties of two-component PU adhesive to a certain extent and realize a comprehensive evaluation of the elastic properties of PU adhesive.

[0071] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A highly elastic two-component PU adhesive, characterized by: The hot melt adhesive is composed of an adhesive component A and a curing agent component B, wherein the adhesive component A includes polyether polyol, polyester polyol, a small molecule chain extender cross-linking agent, a catalyst, a stabilizer and a filler, and the curing agent component B includes polyisocyanate, toluene diisocyanate and diisocyanate; The raw materials of adhesive component A are as follows by weight: Polyether polyol 220-260 parts Polyester polyol 220-260 parts ‌35-48 parts of small molecule chain extender and crosslinker 3-6 parts of catalyst Stabilizer 2-6 parts 3 to 8 parts of filler The raw materials of curing agent component B are as follows by mass: Polyisocyanate 80-145 parts Toluene diisocyanate 80-145 parts 80-145 parts of diisocyanate Among them, polyether polyols and polyester polyols form soft segments, polyisocyanates, toluene diisocyanate and diisocyanate form hard segments, and small molecule chain extenders and cross-linkers promote the cross-linking reaction between polyether polyols, polyester polyols and polyisocyanates, toluene diisocyanate and diisocyanate to form an elastic connection structure of hard segments and soft segments.

2. A highly elastic two-component PU adhesive according to claim 1, characterized in that: The catalyst is selected from one or more of 4,4-dimethylaniline, triethanolamine and 6,6-dimethylcyclohexylamine.

3. The highly elastic two-component PU adhesive according to claim 1, characterized in that: Stabilizers include antioxidants and UV absorbers; The antioxidant is either Finox L-11 or PUB-380. The ultraviolet absorber can be any one of UV-1051 and UV-1 (101).

4. The highly elastic two-component PU adhesive according to claim 1, characterized in that: Fillers include silicates and alumina.

5. The highly elastic two-component PU adhesive according to claim 1, characterized in that: Component A of the adhesive comprises 220 parts of polyether polyol, 220 parts of polyester polyol, 38 parts of small molecule chain extender and cross-linker, 4 parts of catalyst, 4 parts of stabilizer and 6 parts of filler in terms of mass proportion, with a total mass proportion of 492 parts.

6. The highly elastic two-component PU adhesive according to claim 1, characterized in that: The curing agent component B is selected from 82 parts of polyisocyanate, 82 parts of toluene diisocyanate, and 82 parts of diisocyanate in terms of mass proportion, with a total mass proportion of 246 parts.

7. The highly elastic two-component PU adhesive according to claim 1, characterized in that: The adhesive component A and the curing agent component B are stored in relatively sealed aluminum alloy cans, and sampling and testing ports are provided on the aluminum alloy cans.

8. The highly elastic two-component PU adhesive according to claim 1, characterized in that: The temperature of adhesive component A and curing agent component B should not be higher than 15℃ during storage; The humidity range of adhesive component A and curing agent component B during storage is between 55% and 75% RH.

9. The highly elastic two-component PU adhesive according to claim 1, characterized in that: The elasticity test methods of two-component PU adhesive include tensile test, compression test, hardness test, rebound test and wear test; Among them, the tensile test of two-component PU adhesive was carried out by a universal material testing machine; Perform compression test on two-component PU adhesive using compression testing machine; Use Shore or Rockwell hardness tester to test the hardness of two-component PU adhesive; Conduct rebound test of two-component PU adhesive using rebound tester; The wear resistance test of two-component PU adhesive is carried out using a wear resistance testing machine.

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