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Reactive polyurethane hot melt adhesive for household appliance and preparation method of reactive polyurethane hot melt adhesive

A polyurethane hot-melt adhesive, reactive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve poor bonding performance, uneven surface of the adhesive layer, and lack of water resistance and chemical resistance Performance and other issues, to achieve the effect of good interaction and excellent bonding performance

Active Publication Date: 2018-05-04
HANGZHOU ZHIJIANG SILICONE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the reactive polyurethane hot-melt adhesives in the prior art will generate air bubbles during the curing process, causing the surface of the adhesive layer to be uneven, and the bonding performance is poor, and it does not have water resistance and chemical resistance.

Method used

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  • Reactive polyurethane hot melt adhesive for household appliance and preparation method of reactive polyurethane hot melt adhesive
  • Reactive polyurethane hot melt adhesive for household appliance and preparation method of reactive polyurethane hot melt adhesive
  • Reactive polyurethane hot melt adhesive for household appliance and preparation method of reactive polyurethane hot melt adhesive

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Experimental program
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preparation example Construction

[0052] The present invention also provides a preparation method of the reactive polyurethane hot-melt adhesive for household appliances described in the above technical solution, comprising the following steps:

[0053] Mix crystalline polyester polyol, polyether polyol, amorphous polyester polyol, antioxidant and tackifying resin and then dehydrate, then add isocyanate for reaction, and finally add latent curing agent, coupling agent and catalyst for vacuum After defoaming and uniform dispersion, the reactive polyurethane hot melt adhesive is obtained.

[0054] The present invention first mixes crystalline polyester polyol, polyether polyol, amorphous polyester polyol, antioxidant and tackifying resin; the process of described mixing is preferably specifically:

[0055] Mix crystalline polyester polyol, polyether polyol, amorphous polyester polyol and antioxidant, heat up to 75°C to 85°C, then add tackifying resin to complete the mixing process.

[0056] In the present inven...

Embodiment 1

[0062] The formula quantity of the raw materials used in Example 1 is shown in Table 1.

[0063] The formula quantity of raw material used in table 1 embodiment 1

[0064] raw material

[0065] Add hexanediol adipate diol, polyether polyol, amorphous polyester polyol and antioxidant into the reaction kettle according to the formula amount, raise the temperature to 80°C, and then add the formula amount of acrylic resin (BR-113 ), heat up to 115°C-120°C, dehydrate for 2 hours under the condition of vacuum degree ≤ -0.095MPa, until the water content is ≤500ppm, then cool down to 80°C, add the formula amount of MDI, heat up to 95°C for 2h, until the reaction is complete , and finally add the formula amount of latent curing agent, coupling agent and catalyst, vacuum defoaming for 0.5h-1h, until the dispersion is uniform after stirring, then the glue can be discharged and filled, and the reactive polyurethane hot melt adhesive for household appliances is obtained.

Embodiment 2

[0067] The formulation amount of the raw materials used in Example 2 is shown in Table 2.

[0068] The formula quantity of raw material used in table 2 embodiment 2

[0069] raw material

[0070] Add hexanediol adipate diol, polyether polyol, amorphous polyester polyol and antioxidant into the reaction kettle according to the formula amount, raise the temperature to 80°C, and then add the formula amount of acrylic resin (BR-113 ), heat up to 115°C-120°C, dehydrate for 2 hours under the condition of vacuum degree ≤ -0.095MPa, until the water content is ≤500ppm, then cool down to 80°C, add the formula amount of MDI, heat up to 95°C for 2h, until the reaction is complete , and finally add the formula amount of latent curing agent, coupling agent and catalyst, vacuum defoaming for 0.5h-1h, until the dispersion is uniform after stirring, then the glue can be discharged and filled, and the reactive polyurethane hot melt adhesive for household appliances is obtained.

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Abstract

The invention provides a reactive polyurethane hot melt adhesive for a household appliance and a preparation method of the reactive polyurethane hot melt adhesive. The reactive polyurethane hot melt adhesive for the household appliance is prepared from the following raw materials: 100-250 parts by weight of polyester polyol, 1-150 parts by weight of polyether polyol, 50-100 parts by weight of isocyanate, 70-150 parts by weight of tackifying resin, 1-10 parts by weight of a latent curing agent 1, 1-5 parts by weight of an antioxygen, 5-10 parts by weight of a coupler, and 0.01-0.1 part by weight of a catalyst; the polyester polyol comprises crystalline polyester polyol and amorphous form polyester polyol at the mass ratio of 1:(0.25-1.5); and the latent curing agent is an aldimine latent curing agent or a di-zolidine latent curing agent. Compared with the prior art, the provided reactive polyurethane hot melt adhesive for the household appliance adopts the components with the specific contents, the better interaction is achieved, no bubble is produced in the curing process of the obtained product, and the reactive polyurethane hot melt adhesive is excellent in adhesive property, water resistance and chemical resistance.

Description

technical field [0001] The invention relates to the technical field of polyurethane sealants, and more specifically relates to a reactive polyurethane hot-melt adhesive for household appliances and a preparation method thereof. Background technique [0002] Reactive polyurethane hot-melt adhesive (PUR for short): The composition of moisture-curing polyurethane hot-melt adhesive contains terminal NCO polyurethane prepolymer. The hydrogen substance reacts to form a partially cross-linked network structure, which makes the adhesive strength, chemical resistance, heat resistance, and hydrolysis resistance better than ordinary hot melt adhesives. Reactive polyurethane hot melt adhesives are widely used in woodworking, textiles, automobiles, electronics, home appliances and other industries. The synthesis of reactive polyurethane hot melt adhesive is a process combining chemical reaction and physical mixing. The chemical reaction of the synthesis of reactive polyurethane hot mel...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G18/76C08G18/62C08G18/48C08G18/42
CPCC08G18/42C08G18/4202C08G18/48C08G18/625C08G18/7671C09J175/06
Inventor 朱成伟陶小乐何永富陈晨张国锋
Owner HANGZHOU ZHIJIANG SILICONE CHEM
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