Double-component polyurethane adhesive and preparation method thereof

A two-component polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of high solid content, high price, high cost, etc., and achieve good bonding performance and durability Good thermal performance and cheap price

Active Publication Date: 2015-07-01
重庆中科力泰高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The one-component polyurethane adhesive uses HDI and IPDI as raw materials. The prepared adhesive has the advantages of no glue mixing, simple operation method, and high bonding strength. It is necessary to add cyclohexanone and other solvents that are corrosive to PVC film to improve the bonding strength) and other deficiencies
The two-component polyurethane adhesive is prepared by using pure MDI as raw material, adding phenolic resin (to improve the initial bonding strength), and coarse MDI as the curing agent. It has good initial bonding performance and final bonding performance, and good heat resistance in the later stage (80°C However, there are disadvantages such as the color of the prepared glue (the color of phenolic resin), which will change color in the later use process and affect the glossiness of woodworking products in the later stage.
Moreover, the raw materials HDI and IPDI used in the one-component polyurethane adhesive are expensive, and the two-component polyurethane adhesive uses tackifying resin, and the solid content of the product prepared in the later stage is as high as 32%-35%, and the cost is relatively high.

Method used

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  • Double-component polyurethane adhesive and preparation method thereof
  • Double-component polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation of embodiment 1 component A

[0061] Component A is prepared from the following ingredients in parts by weight:

[0062] Polyester polyol: PBA (2000 molecular weight)): 750g;

[0063] Diphenylmethane diisocyanate (MDI): 145g;

[0064] Chain extender: BDO: 18g;

[0065] Catalyst: 0.5 g of stannous octoate;

[0066] Diluent: ethyl ester 1300g, dimethyl carbonate 1300g, dichloromethane 450g, xylene 602g;

[0067] Put the polyester polyol into the reaction kettle, raise the temperature to 110-130°C, vacuum dehydrate for 1-3h, cool to 70-80°C, add diphenylmethane diisocyanate, and prepolymerize 1- 2h, cool down to 60-70°C, add chain extender, react at 70°C±5°C for 1-1.5h, then add organic tin catalyst, continue to react for 2h-3h, cool to 30-40°C, add diluent It can be obtained by adjusting the viscosity at 3500-4500mPa.s / 25℃.

Embodiment 2

[0068] The preparation of embodiment 2 component A

[0069] Component A is prepared from the following ingredients in parts by weight:

[0070] Polyester polyol: PBA (3000 molecular weight)): 750g;

[0071] Diphenylmethane diisocyanate (MDI): 135g;

[0072] Chain extender: BDO: 25g;

[0073] Catalyst: 0.65g of stannous octoate;

[0074] Diluent: ethyl ester 1000g, dimethyl carbonate 1000g, dichloromethane 456g, xylene 500g;

[0075] Put the polyester polyol into the reaction kettle, raise the temperature to 110-130°C, vacuum dehydrate for 1-3h, cool to 70-80°C, add diphenylmethane diisocyanate, and prepolymerize 1- 2h, cool down to 60-70°C, add chain extender, react at 70°C±5°C for 1-1.5h, then add organic tin catalyst, continue to react for 2h-3h, cool to 30-40°C, add diluent It can be obtained by adjusting the viscosity at 6500-7500mPa.s / 25℃.

Embodiment 3

[0076] The preparation of embodiment 3 component A

[0077] Component A is prepared from the following ingredients in parts by weight:

[0078] Polyester polyol: PBA (3000 molecular weight)): 750g;

[0079] Diphenylmethane diisocyanate (MDI): 145g;

[0080] Chain extender: BDO: 30g;

[0081] Catalyst: stannous octoate 1g;

[0082] Diluent: 1200g ethyl ester, 1200g dimethyl carbonate, 350g dichloromethane, 450g xylene;

[0083] Put the polyester polyol into the reaction kettle, raise the temperature to 110-130°C, vacuum dehydrate for 1-3h, cool to 70-80°C, add diphenylmethane diisocyanate, and prepolymerize 1- 2h, cool down to 60-70°C, add chain extender, react at 70°C±5°C for 1-1.5h, then add organic tin catalyst, continue to react for 2h-3h, cool to 30-40°C, add diluent It can be obtained by adjusting the viscosity at 5000-6000mPa.s / 25℃.

[0084] Part II Preparation of Component B

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Abstract

The invention belongs to the field of polyurethane adhesives, relates to coating adhesive for woodworking industry, in particular to a double-component polyurethane adhesive and a preparation method thereof. The double-component polyurethane adhesive is obtained by compounding a component A and a polyurethane component B containing an isocyanate-terminated group, wherein the component A is polyurethane synthesized by polyester polyol and diphenylmethane diisocyanate (MDI) as well as accessory ingredients; the polyurethane component B containing the isocyanate-terminated group is synthesized by polyester polyol and/or polyether polyol, isocyanate, epoxy resin and accessory ingredients. The double-component polyurethane adhesive disclosed by the invention is good in adhesion performance, high in early-stage bonding strength and final bonding strength, and good in heat resistance, does not bounce at 80 DEG C, and is colorless, low in smell and low in cost.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesives, relates to glues for cladding in the woodworking industry, in particular to a two-component polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane adhesives refer to adhesives containing carbamate groups (-NHCOO-) or isocyanate groups (-NCO) in the molecular chain, so polyurethane adhesives exhibit high activity and polarity, and substrates containing active hydrogen, Porous materials such as foam, plastic, wood, leather, fabric, paper, ceramics, and materials with smooth surfaces such as metal, glass, rubber, and plastic have excellent chemical adhesion. [0003] At present, the glue used for woodworking cladding mainly includes one-component polyurethane adhesive and two-component polyurethane adhesive, which are used for bonding PVC film and plastic steel, PVC film and density board, PVC film and wood-plastic and other substrates. The one-compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/04C08G18/76C08G18/66C08G18/42C08G18/58C08G18/48
Inventor 李有刚秦安川柏兴华冉忠祥谭运泰袁天鹏伍有琼刘燕
Owner 重庆中科力泰高分子材料有限公司
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