Reactive polyurethane hot melt adhesive for sealing household appliances, and preparation method thereof

A polyurethane hot-melt adhesive and sealing technology, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, epoxy resin glue, etc., can solve the problem of low assembly efficiency and achieve the effect of improving assembly efficiency

Active Publication Date: 2020-04-17
康达新材料(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it has not been used as a product for sealing metal parts. Therefore, it is very important to design a reactive polyurethane hot melt adhesive that is currently less efficient in sealing and assembling household appliances, and at the same time solves the problem of bonding the reactive polyurethane hot melt adhesive to galvanized iron and coated aluminum. Necessary

Method used

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  • Reactive polyurethane hot melt adhesive for sealing household appliances, and preparation method thereof
  • Reactive polyurethane hot melt adhesive for sealing household appliances, and preparation method thereof
  • Reactive polyurethane hot melt adhesive for sealing household appliances, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of the home appliance sealing reactive polyurethane hot melt adhesive of this embodiment, its steps are as follows:

[0049] 1) Get 15 parts by weight of amorphous polyester polyol, 30 parts by weight of crystalline polyester polyol, 20 parts by weight of polyether polyol, 7 parts by weight of thermoplastic resin, 2 parts by weight of adhesion promoter, 0.1 Add the antioxidant in parts by weight, the ultraviolet absorber in 0.1 parts by weight, and the stabilizer in 0.05 parts by weight into the reaction kettle, and vacuum dehydrate under the condition of 100-130 ° C for 60 minutes;

[0050] 2) Cool down to 90°C, and add 25 parts by weight of diisocyanate while stirring;

[0051] 3) Slowly heat up to 100-120°C, vacuum defoaming reaction for 60 minutes;

[0052] 4) Cool down to 100°C, add 0.05 parts by weight of catalyst and 0.7 parts by weight of silane coupling agent, then heat up, vacuumize at 100-130°C until no bubbles appear, and test viscosity...

Embodiment 2

[0066] The preparation method of the home appliance sealing reactive polyurethane hot melt adhesive of this embodiment, its steps are as follows:

[0067] 1) Get 25 parts by weight of amorphous polyester polyol, 30 parts by weight of crystalline polyester polyol, polyether polyol of 15 parts by weight, tackifying resin of 6 parts by weight, adhesion promoter of 2 parts by weight, Add 0.1 parts by weight of antioxidant, 0.1 parts by weight of ultraviolet absorber, and 0.05 parts by weight of stabilizer into the reaction kettle, and vacuum dehydrate at 100-130 °C for 60 minutes;

[0068] 2) Cool down to 85°C, and add 21 parts by weight of isocyanate while stirring;

[0069] 3) Slowly heat up to 100-130°C, vacuum defoaming reaction for 60 minutes;

[0070] 4) Cool down to 110°C, add 0.05 parts by weight of catalyst and 0.7 parts by weight of silane coupling agent, then heat up, vacuumize at 100-130°C until no bubbles appear, and test viscosity and NCO%;

[0071] 5) After the vi...

Embodiment 3

[0087] 1) Get 10 parts by weight of amorphous polyester polyol, 20 parts by weight of crystalline polyester polyol, 25 parts by weight of polyether polyol, 20 parts by weight of thermoplastic resin, 5 parts by weight of tackifying resin, 0.1 parts by weight Part of antioxidant, 0.1 part by weight of ultraviolet absorber, 0.05 part by weight of stabilizer are added to the reactor, and vacuum dehydration is carried out at 110-130°C for 60 minutes;

[0088] 2) Cool down to 80°C, and add 18 parts by weight of isocyanate while stirring;

[0089] 3) Slowly heat up to 100-130°C, vacuum defoaming reaction for 60 minutes;

[0090] 4) Cool down to 90°C, add 0.05 parts by weight of catalyst and 1.7 parts by weight of silane coupling agent, then heat up, vacuumize at 100-130°C until no bubbles appear, and test viscosity and NCO%;

[0091] 5) After the viscosity and NCO% are qualified, the material is discharged, sealed, and packaged to obtain the product.

[0092] The amorphous polyeste...

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Abstract

The invention discloses a reactive polyurethane hot melt adhesive for sealing household appliances. The reactive polyurethane hot melt adhesive is characterized by comprising, by weight, 20-60 parts of polyester polyol, 5-25 parts of polyether polyol, 0-15 parts of thermoplastic resin, 0-15 parts of tackifying resin, 0-5 parts of an adhesion promoter, 0-2 parts of an antioxidant, 0-2 parts of an ultraviolet light absorber, 0-0.5 part of a stabilizer, 10-40 parts of diisocyanate, 0-1 part of a catalyst and 0-5 parts of a silane coupling agent; and the polyester polyol is any one or more of crystalline polyester polyol and amorphous polyester polyol. The invention also discloses a preparation method of the reactive polyurethane hot melt adhesive. The hot melt adhesive provided by the invention effectively improves the sealing assembly efficiency of current household appliance parts, and solves the problem of bonding of the reactive polyurethane hot melt adhesive to galvanized iron and coating aluminum.

Description

technical field [0001] The invention belongs to the technical field of polyurethane sealant synthesis, and in particular relates to a reactive polyurethane hot-melt adhesive for sealing household appliances and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive is an isocyanate group-terminated prepolymer synthesized from polyester or polyether polyol and diisocyanate, together with thermoplastic resin that does not react with isocyanate group, tackifying resin, antioxidant, accelerator, catalyst and other additives. The reactive polyurethane adhesive is solid at room temperature. When in use, heat and melt the glue on the surface of the material and the air, the moisture on the surface of the adherend or the active hydrogen in the adherend material, and react with it to form a urea bond and partially interact. Joint curing. Therefore, it has the characteristics of high initial viscosity and fast positioning speed of hot mel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J163/02C09J161/02C09J133/04C08G18/76C08G18/48C08G18/42
CPCC09J175/04C08G18/7671C08G18/4018C08G18/4202C08G18/4833C08G18/4825C08K2003/329C08L2205/025C08L2205/03C08L75/04C08L63/00C08K5/00C08K5/3475C08K5/1345C08K5/09C08K5/5435C08L61/02C08K5/092C08L33/04C08K13/02C08K3/32
Inventor 从赫雷方俊郎逸超程瑶
Owner 康达新材料(集团)股份有限公司
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