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Urea-formaldehyde resin adhesive as well as preparation method and application thereof

A technology of urea-formaldehyde resin and adhesive, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of environmental pollution, high brittleness, poor water resistance and light resistance, and achieve formaldehyde release Small amount, good bonding strength

Pending Publication Date: 2020-11-03
HUIZHOU LIERAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of urea-formaldehyde resin or the use of products prepared from urea-formaldehyde resin adhesives, the released formaldehyde irritates the human eyes and respiratory system, seriously pollutes the environment and endangers people's health
[0003] At present, the urea-formaldehyde resin glue produced by domestic industry has the disadvantages of excessive free formaldehyde content, high brittleness, poor water resistance and light resistance, and cannot meet the market demand of the wood building material processing industry.

Method used

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  • Urea-formaldehyde resin adhesive as well as preparation method and application thereof
  • Urea-formaldehyde resin adhesive as well as preparation method and application thereof
  • Urea-formaldehyde resin adhesive as well as preparation method and application thereof

Examples

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preparation example Construction

[0047] The second aspect of the present invention provides a kind of preparation method of described urea-formaldehyde resin adhesive, and it comprises the following steps:

[0048] (1) Add modifier, formaldehyde aqueous solution, ammonia water with a total weight of 85-95% of ammonia water, polyvinyl alcohol, and urea into the reaction vessel, adjust the pH to 8-9.5, heat up to 85-95°C, and add the total weight of melamine 5-10% melamine, heat preservation;

[0049] (2) At 85-95°C, add an acidic solution to adjust the pH to 5-6;

[0050] (3) React at 85-95°C, adjust the pH to 6.5-8.5, add the remaining melamine in batches to react, add alkali to adjust the pH to 8.5-9.5, and lower the temperature;

[0051] (4) Adjust the pH to 9 at 65-75°C, add the remaining ammonia water for post-treatment, cool down, and discharge.

[0052] step 1)

[0053]In one embodiment, the holding time in the step (1) is 30-120 minutes.

[0054] Preferably, the heat preservation time in the step...

Embodiment 1

[0087] Embodiment 1 of the present invention provides a kind of urea-formaldehyde resin adhesive, and its preparation raw material is 1 part of modifier, 130 parts of the aqueous solution of 37wt% formaldehyde, 2 parts of ammonia water, 50 parts of urea, 18 parts of melamine, 0.01 part of defoamer, 0.1 part of polyvinyl alcohol.

[0088] The grade of the polyvinyl alcohol is 20-99; the modifying agent is ammonium bicarbonate; the defoamer is a mineral oil defoamer, and the grade is Rhodoline DF 691.

[0089] The preparation method of described urea-formaldehyde resin adhesive is:

[0090] (1) Add modifier and defoamer to the reaction kettle, add formaldehyde aqueous solution, start stirring, add sodium hydroxide to adjust the pH to 8.5, add 90% of the total weight of ammonia water, polyvinyl alcohol, and 84% of the total weight of urea % urea, stirred for 10 minutes, maintained at a pH of 8.5, heated to 90°C, added melamine with a total weight of 8.9% of melamine, kept at 90°...

Embodiment 2

[0096] Embodiment 2 of the present invention provides a kind of urea-formaldehyde resin adhesive, and its preparation raw material is 5 parts of modifiers, 145 parts of the aqueous solution of 37wt% formaldehyde, 6 parts of ammonia water, 60 parts of urea, 25 parts of melamine, 0.01 part of defoamer, 1 part of polyvinyl alcohol.

[0097] The grade of the polyvinyl alcohol is 20-99; the modifying agent is ammonium bicarbonate; the defoamer is a mineral oil defoamer, and the grade is Rhodoline DF 691.

[0098] The preparation method of described urea-formaldehyde resin adhesive is:

[0099] (1) Add modifier and defoamer to the reaction kettle, add formaldehyde aqueous solution, start stirring, add sodium hydroxide to adjust the pH to 8.5, add 90% of the total weight of ammonia water, polyvinyl alcohol, and 84% of the total weight of urea % urea, stirred for 10 minutes, maintained at pH 9.0, heated up to 90°C, added melamine with a total weight of 8.9% of melamine, and kept at 9...

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Abstract

The invention relates to the technical field of adhesives, in particular to a urea-formaldehyde resin adhesive as well as a preparation method and application thereof. The urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 1-5 parts of a modifier, 130-145 parts of an aqueous solution of formaldehyde, 2-6 parts of ammonia water, 50-60 parts of urea, 18-25 parts of melamine and 0.1-1 part of polyvinyl alcohol; wherein the modifier is an ammonia and / or amine modifier. The urea-formaldehyde resin adhesive provided by the invention is small in formaldehyde release amount and good in bonding strength, a building material prepared by using the adhesive can reach the environment-friendly E2 standard, so that the urea-formaldehyde resin adhesive is particularly suitable for preparing an environment-friendly outdoor building material.

Description

technical field [0001] The invention relates to the technical field of adhesives, more specifically, the invention relates to a urea-formaldehyde resin adhesive, a preparation method and an application thereof. Background technique [0002] Urea-formaldehyde resin adhesive (UF resin) is urea and formaldehyde under the action of a catalyst, condensed into an initial urea-formaldehyde resin, and then under the action of a curing agent or an auxiliary agent, it forms an insoluble and infusible final resin. Urea-formaldehyde resin glue has the advantages of high bonding strength, fast curing, good operability, low cost, and rich sources of raw materials. It is widely used in production. Because in the process of using urea-formaldehyde resin or using products prepared by urea-formaldehyde resin adhesive, the released formaldehyde stimulates people's eyes and respiratory system, seriously pollutes the environment and endangers people's health. [0003] At present, the urea-form...

Claims

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Application Information

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IPC IPC(8): C09J161/32C09J11/08C08G12/40
CPCC08G12/40C09J11/08C09J161/32C08L29/14
Inventor 韩旭
Owner HUIZHOU LIERAN CHEM
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