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Anti-skinning waterborne polyurethane adhesive and preparation method thereof

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of affecting the film-forming properties of the adhesive, increasing the risk of skinning, and reducing the construction quality, and achieves the The formation of water-based polyurethane adhesive skinning film, the effect of good room temperature open skin resistance, and the effect of delaying the film formation rate at room temperature

Inactive Publication Date: 2019-02-15
福建华夏蓝新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of the adhesive, if the crust is not removed, it will directly affect the film-forming performance of the adhesive, and it will also cause various other disadvantages of the adhesive, such as reducing the bonding strength, etc., resulting in a decline in construction quality.
The usual way is to filter out this kind of crust, but this method is not only cumbersome, but also loses part of the adhesive
[0004] It is generally recommended that the storage container of water-based polyurethane adhesives should be kept sealed to isolate the air, but water-based polyurethane adhesives are inevitably exposed to air during storage and use, and these operations increase the risk of skin formation

Method used

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  • Anti-skinning waterborne polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An anti-skinning waterborne polyurethane adhesive comprising the following raw materials by weight: Waterborne polyurethane dispersion A 0 989g, 1g wetting agent, 1g defoamer, 3g thickener and 6g water;

[0023] The aqueous polyurethane dispersion comprises the following raw materials: polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender, and the molar ratio of polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender is 1: 0.1:2:0.2.

[0024] The aqueous polyurethane dispersion A 0 The synthesis steps are:

[0025] Under the condition of dry nitrogen protection, in a four-neck flask equipped with a thermometer, a stirrer and a reflux condenser, 1mol polyoxypropylene glycol (Mw=2000Da), 0.3mol magnesium lithium silicate powder were stirred and dispersed, and the temperature was raised to 100 ℃, dehydrated by vacuum filtration until the water content is less than 0.1%; pass through dry nitrogen as a protective gas, cool down ...

Embodiment 2

[0029] An anti-skinning waterborne polyurethane adhesive comprising the following raw materials by weight: Waterborne polyurethane dispersion B 0 : 950g, wetting agent 5g, defoamer 5g, thickener 10g and water 30g;

[0030] The aqueous polyurethane dispersion B 0 It is prepared from the following raw materials: polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender, and the molar ratio of the polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender is 1:0.5:3:1.

[0031] The aqueous polyurethane dispersion B 0 The synthesis steps are:

[0032] Under the condition of dry nitrogen protection, in a four-necked flask equipped with a thermometer, a stirrer and a reflux condenser, 1mol polyoxyethylene glycol (Mw=1000Da) and 0.23mol magnesium aluminum silicate powder were stirred and dispersed, and the temperature was raised to 110 ℃, dehydrated by vacuum filtration until the moisture is less than 0.1%; pass dry nitrogen as a protective gas...

Embodiment 3

[0036] An anti-skinning waterborne polyurethane adhesive comprising the following raw materials by weight: Waterborne polyurethane dispersion C 0 975g, wetting agent 3g, defoamer 2g, thickener 1g and water 19g;

[0037] The aqueous polyurethane dispersion comprises the following raw materials: polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender, and the molar ratio of polyol, inorganic mineral powder, polyisocyanate and carboxyl chain extender is 1: 0.6:5:2.

[0038] The aqueous polyurethane dispersion C 0 The synthesis steps are:

[0039] Under dry nitrogen protection conditions, in a four-necked flask with a thermometer, a stirrer and a reflux condenser, 1mol polycaprolactone diol (Mw=1360Da), 0.25mol magnesium lithium silicate and 0.13mol magnesium silicate Stir and disperse aluminum, raise the temperature to 120°C, vacuum filter and dehydrate until the moisture is less than 0.1%; pass dry nitrogen as a protective gas, cool down to 40-50°C, add 3...

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Abstract

The invention relates to the technical field of adhesives, in particular to an anti-skinning waterborne polyurethane adhesive and a preparation method thereof. The anti-skinning waterborne polyurethane adhesive is prepared from the following raw materials in parts by weight: 95-99 parts of a waterborne polyurethane dispersoid, 0.1-0.5 part of a wetting agent, 0.1-0.5 part of an antifoaming agent and 0.1-1 part of a thickening agent, wherein the waterborne polyurethane dispersoid is prepared from the following raw materials: polyol, inorganic mineral powder, polyisocyanate and a carboxyl chainextender in a molar ratio is 1:(0.1-0.6):(2-5):(0.2-2). According to the anti-skinning waterborne polyurethane adhesive and the preparation method thereof, reaction between the inorganic mineral powder and the polyisocyanate is carried out, the prepared waterborne polyurethane dispersoid cannot completely enclose the active groups of the inorganic mineral powder, and certain water-retaining groupsof the inorganic mineral powder are retained, so that the generation of skinned adhesive films of the waterborne polyurethane adhesive skinning is inhibited.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an anti-skinning water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] With the development of science and technology, water-based polyurethane adhesives have made great progress, replacing solvent-based polyurethane adhesives in many fields. Water-based polyurethane adhesives have extremely low solvent content, are environmentally friendly, easy to use, and have high bonding strength. More and more people have begun to pay attention to the use of water-based polyurethane adhesives. [0003] When the water-based polyurethane adhesive is stored or opened for sizing, the surface of the adhesive is in contact with the air. When the temperature is high, the moisture in the surface of the adhesive is easy to volatilize, and the latex particles in the water-based polyurethane dispersion gradually move closer together, extruded and deformed,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C09J175/14C08G18/69C08G18/66C08G18/48C08G18/42C08G18/34C08K3/34
CPCC08G18/348C08G18/4277C08G18/4825C08G18/4833C08G18/4854C08G18/6659C08G18/6692C08G18/69C08K3/34C09J175/06C09J175/08C09J175/14
Inventor 邱元进郑力铭饶长贵陈国栋
Owner 福建华夏蓝新材料科技有限公司