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Preparation method of moisture-curing polyurethane hot melt adhesive

A polyurethane hot-melt adhesive and moisture-curing technology, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems affecting bonding strength processing, etc., to prolong service life and stabilize product performance Effect

Inactive Publication Date: 2019-09-20
南通天洋新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the more intense reaction, more carbon dioxide products will be produced while the product is rapidly solidified, resulting in more air bubbles, which will affect the final bonding strength and subsequent processing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of moisture-curing polyurethane hot-melt adhesive, the steps are as follows:

[0031] (1) Add 50 parts of adipic acid polyester polyol, 10 parts of polyethylene glycol phthalate diol, 20 parts of polyoxypropylene ether diol, and 0.05 part of antioxidant into the reaction kettle Stir evenly, heat up to 120°C-130°C, and dehydrate for 2 hours under the condition of vacuum degree <100Pa;

[0032] (2) Cool down to 75°C-95°C, add 18 parts of MDI, 0.05 parts of catalyst, and stir for 2 hours at a temperature of 85°C-90°C and vacuum <100Pa;

[0033] (3) Add 0.05 parts each of defoamer, latent curing agent and dehydrating agent, and stir rapidly for 30 minutes under the condition of vacuum degree <100Pa;

[0034] (4) Quickly discharge and package under nitrogen protection.

[0035] A sample of the product prepared from Example 1 is labeled A1.

Embodiment 2

[0037] A preparation method of moisture-curing polyurethane hot-melt adhesive, the steps are as follows:

[0038] (1) Add 60 parts of adipic acid polyester polyol, 10 parts of polytrimethylene phthalate diol, 10 parts of polyoxypropylene ether diol, and 0.05 part of antioxidant into the reaction kettle and stir evenly. Heat up to 120°C-130°C, and dehydrate for 2 hours under the condition of vacuum degree <100Pa;

[0039] (2) Cool down to 75°C-95°C, add 18 parts of MDI, 0.05 parts of catalyst, and stir for 2 hours at a temperature of 85°C-90°C and vacuum <100Pa;

[0040] (3) Add 0.05 parts each of defoamer, latent curing agent and dehydrating agent, and stir rapidly for 30 minutes under the condition of vacuum degree <100Pa;

[0041] (4) Quickly discharge and package under nitrogen protection.

[0042] A sample of the product prepared from Example 2 is labeled A2.

Embodiment 3

[0044] A preparation method of moisture-curing polyurethane hot-melt adhesive, the steps are as follows:

[0045] (1) Add 50 parts of adipic acid polyester polyol, 20 parts of polytrimethylene phthalate diol, 10 parts of polyoxypropylene ether diol, and 0.05 part of antioxidant into the reaction kettle and stir evenly. Heat up to 120°C-130°C, and dehydrate for 2 hours under the condition of vacuum degree <100Pa;

[0046] (2) Cool down to 75°C-95°C, add 18 parts of MDI, 0.05 parts of catalyst, and stir for 2 hours at a temperature of 85°C-90°C and vacuum <100Pa;

[0047] (3) Add 0.05 parts each of defoamer, latent curing agent and dehydrating agent, and stir rapidly for 30 minutes under the condition of vacuum degree <100Pa;

[0048] (4) Quickly discharge and package under nitrogen protection.

[0049] A sample of the product prepared from Example 3 is labeled A3.

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PUM

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Abstract

The invention discloses a preparation method of a moisture-curable polyurethane hot melt adhesive. The method comprises the following steps: 1) adding adipic acid polyester polyol, phthalic anhydride polyester polyol, polyoxypropylene ether glycol and an antioxidant into a reaction kettle, uniformly stirring the components, heating the mixture to 120-130 DEG C, and dehydrating the mixture for 2 h under the vacuum degree of less than 100 Pa; (2) cooling the mixture to 75-95 DEG C, adding MDI and a catalyst, and stirring the mixture to carry out a reaction for 2 hours at the temperature of 85-90 DEG C and the vacuum degree of less than 100Pa; 3) adding an auxiliary agent, and quickly stirring the mixture for 30 minutes under the vacuum degree of less than 100 Pa; and 4) rapidly discharging and packaging the product under the protection of nitrogen. According to the PUR prepared through the method, curing is accelerated, meanwhile, the mode that -NCO groups react with water vapor in air for curing is changed, the -NCO groups react with active hydrogen in a latent curing agent, a carbon dioxide product is not generated, meanwhile, due to addition of a combined auxiliary, the product performance is further stabilized, and the service life is prolonged.

Description

technical field [0001] The invention relates to a method for preparing a moisture-curing polyurethane hot-melt adhesive, in particular to a method for preparing a moisture-curing polyurethane hot-melt adhesive suitable for use in the field of household appliances that does not foam after curing. Background technique [0002] Moisture-curing polyurethane hot melt adhesive (hereinafter referred to as PUR) is a type of polyurethane adhesive containing terminal-NCO groups. When in use, heat, melt and sizing, and after the adhesive layer is cooled and physically solidified to produce preliminary adhesive force, the -NCO group in the adhesive layer reacts with the moisture in the air or the active hydrogen compound on the surface of the adherend to form a chemical bond. At the same time, some carbon dioxide products will be produced during cross-linking and curing, which will cause bubbles to appear on the surface of the adherend and affect the bonding effect. [0003] PUR produc...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J175/08C09J11/08C08G18/76C08G18/71C08G18/48C08G18/42C08G18/32
CPCC08G18/3256C08G18/4018C08G18/4202C08G18/4238C08G18/4825C08G18/715C08G18/7671C09J11/08C09J175/06C09J175/08C08L83/04
Inventor 曲本琛毛雨雪郑仁峰
Owner 南通天洋新材料有限公司
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