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Isocyanate adhesive and method for preparing multilayer polyurethane structural composite by using same

A technology of isocyanate and composite materials, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of uncontrollable sizing amount, complicated application of preparation process, and bonding rubber rollers, etc., to achieve The amount of sizing can be accurately controlled and the effect of reducing costs

Active Publication Date: 2017-05-17
WANHUA CHEM BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The commonly used wet-process polyurethane automotive roof preparation method in this field includes the use of adhesives. First, a catalyst is added to the isocyanate adhesive, and then the adhesive is rolled onto one or both sides of the polyurethane foam sheet, and then sprayed with water and covered. Glass fiber and non-woven fabrics are placed in a mold for high-temperature compression molding. Although an isocyanate adhesive that is not sensitive to moisture is used, the viscosity of the adhesive will increase during use, and the rubber roller will be bonded. Can not be controlled; Another kind of technical scheme is to roll-coat the adhesive agent that does not contain catalyst on the polyurethane foam sheet, spray the aqueous solution that contains catalyst again in the post-production process to solidify, but commonly used catalysts have higher requirements on the quality of water, such as Flocs or sediments will be produced in urban tap water, which will increase the difficulty of the material preparation process and affect the quality of the product. For example, these commonly used catalysts include amine catalysts, such as triethylenediamine, dimethylaminoethyl base ether etc.
[0006] The prior art discloses some technical solutions, such as CN103921504 discloses a car roof preparation process using a hot-melt adhesive film instead of a polyurethane adhesive, the hot-melt adhesive film does not have a foaming process, and its bonding performance is worse than that of a polyurethane moisture-curing adhesive. CN104031596A discloses A low molding temperature water-based polyurethane adhesive and its preparation method, the adhesive does not contain organic solvents, low VOC, but its preparation process and the application on the car roof are more complicated, but these technical solutions can not solve the existing problems question

Method used

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  • Isocyanate adhesive and method for preparing multilayer polyurethane structural composite by using same
  • Isocyanate adhesive and method for preparing multilayer polyurethane structural composite by using same
  • Isocyanate adhesive and method for preparing multilayer polyurethane structural composite by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Isocyanate component A1: PM200, viscosity 200 mPaS (25°C), NCO content 31%.

[0069] Composite catalyst aqueous solution B1: the concentration is 3wt%, and the composite catalyst is composed of dimethylaminoethyl ether and trisodium aminotriacetate in a weight ratio of 100:2.

[0070] Coat the two sides of the glass fiber mat with isocyanate component A1, and cover the two sides of the polyurethane foam respectively to form a three-layer structure. Spray the composite catalyst aqueous solution B1 on both sides of the three-layer structure, and cover the non-woven fabric. Press in the mold for 28 seconds to form, and obtain the polyurethane five-layer structure composite material.

[0071] Among them, the amount of isocyanate component A1 is 60g / m 2 , the dosage of composite catalyst aqueous solution B1 is 50g / m 2 .

[0072] In the embodiment, no precipitation occurs during the spraying of the composite catalyst aqueous solution B1, the isocyanate component A1 is even...

Embodiment 2

[0074] Isocyanate component A2: PM200, viscosity 200 mPaS (25°C), NCO content 31%.

[0075] Composite catalyst aqueous solution B2: the concentration is 8wt%, and the composite catalyst is composed of dimethylaminoethyl ether and trisodium aminotriacetate in a weight ratio of 100:0.5.

[0076] The isocyanate component A2 is coated on both sides of the glass fiber mat, respectively covering both sides of the polyurethane foam to form a three-layer structure, and the composite catalyst aqueous solution B2 is sprayed on both sides of the three-layer structure, and covered with non-woven fabric. Press in the mold for 40 seconds to form, and obtain the polyurethane five-layer structure composite material.

[0077] Among them, the amount of isocyanate component A2 is 90g / m 2 , the dosage of composite catalyst aqueous solution B2 is 10g / m 2 .

[0078] In the embodiment, no precipitation occurs during the spraying process of the composite catalyst aqueous solution B2, the isocyanat...

Embodiment 3

[0080] Isocyanate component A3: formed by reacting 95 parts by weight of PM200 and 5 parts of polyether polyol 1, with a viscosity of 220 mPaS (25° C.) and an NCO content of 30.2%.

[0081] Composite catalyst aqueous solution B3: the concentration is 5wt%, and the composite catalyst is composed of triethylenediamine and tetrasodium ethylenediaminetetraacetic acid in a weight ratio of 100:1.

[0082] The isocyanate component A3 is coated on both sides of the glass fiber felt, respectively covered on both sides of the polyurethane foam to form a three-layer structure, and the composite catalyst aqueous solution B3 is sprayed on both sides of the three-layer structure, and covered with non-woven fabrics. Press in the mold for 20 seconds to form, and obtain the polyurethane five-layer structure composite material.

[0083] Among them, the amount of isocyanate component A3 is 70g / m 2 , the dosage of composite catalyst aqueous solution B3 is 20g / m 2 .

[0084] In the embodiment, ...

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Abstract

The invention discloses an isocyanate adhesive. The adhesive comprises: A, an isocyanate component; B, a composite catalyst aqueous solution. The composite catalyst comprises an amine-containing organic compound and an aminocarboxylate stabilizer; aminocarboxylate is added, so that insoluble substances generated by an amine catalyst in water can be inhibited; water spraying equipment is not blocked in the application process; the curing speed of the isocyanate adhesive can be properly adjusted by changing the concentration of the catalyst; the operation is convenient. The invention also discloses a method for preparing a multilayer polyurethane structural composite by using the isocyanate adhesive. The prepared multilayer polyurethane structural composite can be applied to interior components and can be particularly applied to automobile ceiling roof components.

Description

technical field [0001] The invention relates to an isocyanate adhesive and a method for preparing a polyurethane multilayer structure composite material, especially a polyurethane multilayer structure composite material for automobile parts. Background technique [0002] Generally speaking, soft polyurethane foam is mainly used in the field of furniture, which has the characteristics of open-cell foam, softness, and high elongation; hard polyurethane foam is mainly used in insulation materials in construction and household appliances, etc., with closed-cell foam, high rigidity, Brittle and other characteristics. [0003] In the field of car roof, the polyurethane foam used is between soft foam and hard foam, so it is called semi-rigid polyurethane foam. There are usually two processes for preparing polyurethane car headliners: one is dry method and the other is wet method. From the theory of polymer materials, the semi-rigid thermoplastic polyurethane foam used for the roo...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J175/08B32B27/12B32B17/02B32B17/10
Inventor 张谦和郑小生王金
Owner WANHUA CHEM BEIJING
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