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A kind of urea-formaldehyde resin glue and preparation method thereof

A technology of urea-formaldehyde resin glue and formaldehyde solution, which is applied in the field of household glue, can solve problems such as difficulty in obtaining satisfactory glue strength, unfavorable glue on the surface of straw, and substandard environmental protection performance, and achieve low production cost, long storage period, and high glue strength. Effect

Active Publication Date: 2022-02-22
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, urea-formaldehyde resin itself has certain defects, and its storage period is short; the wood-based panels produced with urea-formaldehyde resin have the problems of high formaldehyde release in the process of manufacture and use, and the environmental protection performance is not up to standard; and the surface of straw contains substances that are not conducive to gluing , it is difficult to obtain satisfactory bonding strength with traditional urea-formaldehyde resin glue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The embodiment of the present invention provides a preparation method of urea-formaldehyde resin glue, comprising the following steps:

[0025] S1, add urea, formaldehyde solution, polyvinyl alcohol, and anionic polyacrylamide into the reaction container, wherein urea and formaldehyde are used as adhesive raw materials to react to form urea-formaldehyde resin glue, and polyvinyl alcohol is used as a tackifier to increase the viscosity of urea-formaldehyde resin. Acrylamide acts as a reinforcing agent to increase the strength of the adhesive. Use sodium hydroxide solution to adjust the pH to 7.5-8.5, and keep warm at 60-70°C for 28-32 minutes; raise the temperature to 85-95°C, and keep warm for 28-32 minutes;

[0026] S2, use ammonium chloride solution to adjust the pH to 3.5-4.5; then use sodium hydroxide solution and ammonia water to adjust the pH to 7.0-8.0, sodium hydroxide is strong in alkalinity, and is used to roughly adjust the pH value, while ammonia water is we...

Embodiment 1

[0035] (1) Add 4000g of 37wt% formaldehyde solution to the reactor, mix in 2000g of urea, 40g of anionic polyacrylamide, 10g of polyvinyl alcohol, adjust the pH to 8 with 20wt% concentration of sodium hydroxide solution, and simultaneously raise the temperature to 60°C and keep it warm for 30min .

[0036] (2) Continue to heat up to 95° C., and keep the temperature for 30 minutes.

[0037] (3) Adjust the pH to about 4 with a 10% concentration of ammonium chloride solution, and the solution becomes a viscous jelly at this time.

[0038] (4) Adjust the pH to 7.5 with 20% sodium hydroxide solution and 25 wt% ammonia water, and the dosage ratio of sodium hydroxide and ammonia water is 1:6.

[0039] (5) Add 120 g of melamine, lower the temperature to 80° C. and react for 30 minutes.

[0040] (6) Carry out the glue drop test, and the glue droplet presents umbrella shape or Flammulina velutipes shape in water.

[0041] (7) Add 20 wt% sodium hydroxide solution to adjust the pH to 8...

Embodiment 2

[0047] The modified urea-formaldehyde resin glue was prepared by the same method as in Example 1, except that the amount of formaldehyde was changed to 3000g. Obtain modified urea-formaldehyde resin glue as follows:

[0048]After testing, the appearance is milky white, solid content: 68wt%, free formaldehyde: 0.2wt%, pH value: 7.1, storage period: 4.5 months, and the test method is the same as in Example 1.

[0049] Water resistance: use honeysuckle as raw material and the environmentally-friendly urea-formaldehyde resin glue as an adhesive to manufacture wood-based panels by hot pressing, and obtain a thickness of 14.8mm. Put the wood-based panels in water at room temperature for 24 hours to become 15.248mm. The thickness is increased by 5%, and the structural integrity is good.

[0050] Mechanical properties: The wood-based panel is made of honeysuckle as raw material and the environmentally friendly urea-formaldehyde resin glue as the adhesive. The elastic modulus of the w...

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Abstract

The invention provides a preparation method of urea-formaldehyde resin glue, comprising the following steps: S1, adding urea, formaldehyde solution, polyvinyl alcohol, and anionic polyacrylamide into a reaction vessel, adjusting the pH to 7.5-8.5 with sodium hydroxide solution, Keep warm at 60-70°C for 28-32 minutes; raise the temperature to 85-95°C and keep warm for 28-32 minutes; S2, adjust the pH to 3.5-4.5 with ammonium chloride solution; then adjust the pH to 7.0-7.0 with sodium hydroxide solution and ammonia water 8.0; S3, then add melamine, cool down to 70-80°C, and react for 28-32 minutes; then adjust the pH to 7.5-8.5 with sodium hydroxide solution to obtain a white viscous liquid, which is the urea-formaldehyde resin glue. The urea-formaldehyde resin glue has low formaldehyde emission, high bonding strength and simple preparation process.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin glue and a preparation method thereof, belonging to the technical field of household glue. Background technique [0002] With the development of the national economy, the demand for wood-based panels is increasing. Traditional wood-based panels are all made of wood. However, China's forest area is small, the amount of resources is small, the regional distribution is uneven, and the per capita forest stock volume is far below the world level; at the same time, in order to maintain the needs of the ecological environment and maintain the sustainable development of my country's forest resources, the country has implemented a natural forest protection project , Many areas have implemented the policy of banning logging, limiting logging and closing mountains for afforestation, which greatly reduces the supply of timber. This makes wood-based panels face the pressure of lack of raw materials. In order to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/38C09J161/32
CPCC08G12/40C08G12/38C09J161/32
Inventor 罗学涛乐险黄柳青陈广玉周伟盈黄柳英张飒
Owner XIAMEN UNIV
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