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Solvent-free two-component polyurethane adhesive for structural bonding and application thereof

A technology of polyurethane adhesive and two-component polyurethane, applied in the direction of polyurea/polyurethane adhesive, adhesive, non-polymer adhesive additive, etc., can solve the problems of low elongation at break, harmful to human health, unfavorable to environmental protection, etc. , to achieve the effect of excellent aging resistance, good bonding effect and wide application range

Inactive Publication Date: 2021-03-26
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pre-grinding treatment increases production costs, pollutes the environment, and affects production efficiency. Therefore, there are many adhesives for SMC grinding-free bonding in the prior art
[0005] Although the two-component polyurethane adhesive introduced in Chinese patent CN 102559126 B achieves effective bonding to SMC without grinding, this adhesive is achieved by significantly increasing the body strength, which exceeds 20Mpa, sacrificing the unique toughness of polyurethane , leading to low elongation at break and poor toughness
Although the two-component polyurethane adhesive introduced in the patent CN 111320959 A also realizes the effective bonding of SMC without grinding, this adhesive is realized by adding an organic solvent to dissolve the residual small molecule release agent on the surface of the SMC. The addition of organic solvents is not conducive to environmental protection and is harmful to human health

Method used

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  • Solvent-free two-component polyurethane adhesive for structural bonding and application thereof
  • Solvent-free two-component polyurethane adhesive for structural bonding and application thereof
  • Solvent-free two-component polyurethane adhesive for structural bonding and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example provides a solvent-free two-component polyurethane adhesive for structural bonding, which consists of component A and component B;

[0037] Component A contains the following components in parts by weight: 40 parts of BASF Sovermol 805, 10 parts of EG, 46 parts of calcium carbonate, 2 parts of 3A molecular sieve, 1 part of fumed silica, 0.5 part of carbon black, 0.5 part of dibutyltin dilaurate share;

[0038] Component B comprises the following components in parts by weight: 40 parts of isocyanate-terminated polyurethane prepolymer (NCO%=20%), 10 parts of HDI, 46 parts of calcium carbonate, 2 parts of 3A molecular sieve, 1 part of fumed silica, 1 copy of KH560;

[0039] The isocyanate-terminated polyurethane prepolymer is prepared by reacting polyester polyol (Shanghai Lianjing POL-8520) with isocyanate (MDI-50).

Embodiment 2

[0041] This example provides a solvent-free two-component polyurethane adhesive for structural bonding, which consists of component A and component B;

[0042] Component A contains the following components in parts by weight: 20 parts of Shanghai Jingri AP11, 4 parts of glycerin, 20 parts of silicon micropowder, 0.5 part of 3A molecular sieve, 0.5 part of organic bentonite, 0.1 part of iron black, and 0.5 part of dibutyltin dilaurate ;

[0043] Component B comprises the following components in parts by weight: 20 parts of isocyanate-terminated polyurethane prepolymer (NCO%=15%), 15 parts of cyclohexane dimethylene diisocyanate, 20 parts of aluminum hydroxide, 0.5 parts of 4A molecular sieve Part, 0.5 part of fumed silica, 0.5 part of β-(3,4-epoxycyclohexyl) ethyltrimethoxysilane;

[0044]The isocyanate-terminated polyurethane prepolymer is prepared by reacting polyester polyol (Shanghai Lianjing POL-8520) with isocyanate (MDI-50).

Embodiment 3

[0046] This example provides a solvent-free two-component polyurethane adhesive for structural bonding, which consists of component A and component B;

[0047] Component A comprises the following components in parts by weight: 60 parts of BASF Sovermol 805, 15 parts of trimethylolpropane, 50 parts of alumina, 8 parts of 3A molecular sieves, 8 parts of fumed silica, 2 parts of carbon black, dilaurel 1 part of dibutyltin acid;

[0048] Component B comprises the following components in parts by weight: 70 parts of isocyanate-terminated polyurethane prepolymer (NCO%=10%), 30 parts of toluene diisocyanate, 50 parts of aluminum oxide, 8 parts of 3A molecular sieve, and 8 parts of fumed silica Parts, 2 parts of γ-aminopropyltrimethoxysilane;

[0049] Isocyanate-terminated polyurethane prepolymers were prepared by reacting polycaprolactone polyol (Pastor CAPA 2200) with isocyanate (MDI-50).

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Abstract

The invention provides a solvent-free two-component polyurethane adhesive for structural bonding and an application thereof. The polyurethane adhesive is composed of a component A and a component B; the component A comprises the following components in parts by weight: 20-60 parts of modified vegetable oil polyol, 1-15 parts of a chain extender, 20-50 parts of a filler, 0.5-10 parts of a water removal agent, 0.5-8 parts of a thixotropic agent, 0.01-3 parts of a pigment and 0.001-3 parts of a catalyst; and the component B comprises the following components in parts by weight: 20-70 parts of anisocyanate-terminated polyurethane prepolymer, 0-30 parts of isocyanate, 20-50 parts of a filler, 0.5-10 parts of a water removal agent, 0.5-8 parts of a thixotropic agent and 0.01-5 parts of a silanecoupling agent. The polyurethane adhesive is excellent in comprehensive performance, has the characteristics of high bonding strength, good toughness, excellent aging resistance and the like, is widein bonding applicability, can be suitable for structural bonding of composite materials, plastics, metals and the like, and particularly can be used for polishing-free effective bonding of SMC and other thermosetting composite materials; and the bonding process of SMC and other thermosetting composite materials is greatly optimized.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a solvent-free two-component polyurethane adhesive for structural bonding and its application. Background technique [0002] Structural adhesives refer to adhesives that are used in the bonding of stressed structural parts, can withstand large dynamic loads and static loads, and can be used for a long time. Structural adhesives are increasingly replacing bolts, rivets, welding, etc., to achieve effective connections of metals, plastics, etc. [0003] Structural adhesives, according to the type of matrix resin, can be mainly divided into epoxy structural adhesives, acrylate structural adhesives and polyurethane structural adhesives. Epoxy structural adhesives are hard and brittle, with poor toughness; acrylic structural adhesives have a strong odor and irritate the respiratory tract, which is not conducive to human health. Polyurethane structural adhesives, especi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J11/04C09J11/06C08G18/10C08G18/67C08G18/32C08G18/66
CPCC08G18/10C08G18/664C08G18/6644C08K2003/2206C08K2003/2227C08K2003/265C09J11/04C09J11/06C09J175/14C08K13/04C08K7/26C08K3/26C08K3/04C08K5/5435C08G18/36C08G18/3206C08K3/36C08K3/346C08K3/22C08K5/544
Inventor 周敏熊二青金燕赵勇刚
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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