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A kind of coating glue and preparation method thereof

A technology of laminating adhesive and pH value, applied in the direction of adhesives, adhesive types, adhesive additives, etc., can solve the problems of low viscosity, single color, poor surface abrasion resistance of film-forming objects, etc., to achieve high brightness and easy operation. Simple, good surface abrasion resistance

Active Publication Date: 2016-01-20
FUJIAN LONGDA BAMBOO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing film-covering glue is a milky white transparent substance, which has the problems of single color, low viscosity, and poor wear resistance on the surface of the film-forming material.

Method used

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  • A kind of coating glue and preparation method thereof
  • A kind of coating glue and preparation method thereof

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preparation example Construction

[0017] A kind of preparation method of coating adhesive provided by the invention comprises the following steps:

[0018] (1) Add 880-900 parts by weight of water into the reaction kettle, stir, adjust the temperature to 40-50°C, then add 75-80 parts by weight of polyvinyl alcohol, heat up to 75-80°C and keep warm for 42-48min ;

[0019] (2) Adjust the temperature to 80-85°C, add 135-150 parts by weight of formaldehyde, raise the temperature to 90-95°C, keep warm for 55-65min, adjust the pH value to 4.4-4.6, and then add 450-500 parts by weight of melamine modified phenolic Resin adhesive, stir evenly;

[0020] (3) Adjusting the pH value to 9.4-9.6 to obtain the coating glue.

[0021] As can be seen from the foregoing description, the beneficial effects of the present invention are:

[0022] (1) the film-coated glue prepared by the present invention is reddish-brown transparent, which overcomes the single problem of the color of the film-coated glue in the prior art;

[00...

Embodiment 1

[0033] 1. Put 880 kg of water into the reaction kettle, start the agitator to stir, and raise the temperature to 45°C, and put in 75 kg of polyvinyl alcohol.

[0034] 2. Raise the temperature to 78°C, the polyvinyl alcohol will gradually dissolve and become transparent, keep warm for 45 minutes, and keep the temperature between 80°C and 85°C to ensure the complete dissolution of the polyvinyl alcohol;

[0035] 3. Add 135 kg of formaldehyde, raise the temperature to 90°C, and keep it warm for 60 minutes. At this time, extract a small amount of the product in the reaction kettle and measure it with 4 cups at 40°C. Add hydrochloric acid with a mass concentration of 30%, adjust the pH value to 4.5, and add 450 kg of melamine-modified phenolic resin adhesive. Add the sodium hydroxide that mass concentration is 99%, regulate pH value to be 9.5; In reaction, the hydrochloric acid that mass concentration is 30% and the sodium hydroxide that mass concentration is 99% not only play the ...

Embodiment 2

[0039] 1. Put 900 kg of water into the reaction kettle, start the agitator to stir, and raise the temperature to 50°C, and put in 80 kg of polyvinyl alcohol.

[0040] 2. Raise the temperature to 80°C, the polyvinyl alcohol gradually dissolves and becomes transparent, keep warm for 48 minutes, and the temperature is controlled between 80°C-85°C to ensure that the polyvinyl alcohol is completely dissolved.

[0041] 3. Add 150 kg of formaldehyde, raise the temperature to 90°C, and keep it warm for 65 minutes. At this time, extract a small amount of the product in the reaction kettle, and measure it with 4 cups at 40°C. The measured viscosity value is 22〃. Add hydrochloric acid with a mass concentration of 30%, adjust the pH value to 4.6, and add 500 kg of melamine-modified phenolic resin adhesive. Add the sodium hydroxide that mass concentration is 99%, regulate pH value to be 9.6; In the reaction, the hydrochloric acid that mass concentration is 30% and the sodium hydroxide that...

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Abstract

The invention discloses film covering glue and a preparation method thereof. The preparation method comprises the steps of (1) adding 880-900 weight parts of water in a reaction kettle, mixing, regulating the temperature to 40-50 DEG C, then adding 75-80 weight parts of polyvinyl alcohol, raising the temperature to 40-50 DEG C and holding for 42-48min; (2) regulating the temperature to 80-85 DEG C, adding 135-150 weight parts of formaldehyde, raising the temperature to 90-95 DEG C, holding for 55-65min, regulating a pH value to 4.4-4.6, then adding 450-500 weight parts of melamine modified phenolic resin adhesive, and uniformly mixing; and (3) regulating the pH value to 9.4-9.6 to obtain the film covering glue. The preparation method of the film covering glue is simple to operate and is beneficial to industrial production. The film covering glue prepared by the preparation method has the advantages of high brightness, good surface abrasion resistance, and good flexibility.

Description

technical field [0001] The invention relates to the technical field of glue, in particular to a coating glue and a preparation method thereof. Background technique [0002] Laminating glue refers to a kind of glue that combines BOPP film on paper. It can be widely used in the packaging of all color-printed products such as food, beverages, fruits, and children's toys, as well as the varnishing of various veneer panels, etc., and can be made into quick-drying glue, jigsaw glue, and sealing glue with simple modification. And other products, has the advantages of one product with multiple uses. The existing coating glue is a milky white transparent substance, which has the problems of single color, low viscosity, and poor wear resistance on the surface of the film-forming material. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a coating adhesive with high viscosity and good surface wear re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/14C09J129/04C09J11/06
CPCC09J161/14C08L29/14
Inventor 真道明
Owner FUJIAN LONGDA BAMBOO
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