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Modified urea-formaldehyde glue and preparation method thereof

A technology for modifying urea-formaldehyde and formaldehyde, which is applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc. It can solve the problems of low free formaldehyde content, no antibacterial effect of urea-formaldehyde adhesives, and unfavorable promotion. The ability to kill microorganisms, good physical and mechanical properties, and the effect of reducing the amount of formaldehyde released

Active Publication Date: 2019-01-08
广西横县新威林板业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201310379676.1 discloses a moisture-proof urea-formaldehyde resin, which adds polyacrylate emulsion, polydimethylsiloxane and EVA latex in the late polymerization stage of urea-formaldehyde resin, and adds filler after the stirring reaction is complete. Through this process, It avoids the occurrence of gel phenomenon in the polymerization process. The obtained urea-formaldehyde resin has a narrow molecular weight distribution and low formaldehyde residual. It is used for the production of wood-based panels, especially ceiling decorative panels. It can be used in places with high humidity in the south, and the formaldehyde emission is low; The fillers used in this method are calcium carbonate, kaolin, and titanium dioxide of more than 200 meshes, which are easy to coagulate and affect the progress of the reaction after being added, and are not easy to store urea-formaldehyde resin for a long time, and its urea-formaldehyde resin has no antibacterial effect
Chinese patent CN201510118759.4 discloses a preparation method of nano-silica rosin modified urea-formaldehyde resin, using weak base-weak acid-weak base process to prepare urea-formaldehyde resin with urea and formaldehyde, after modification with nano-silica and rosin, Nano-silica rosin modified urea-formaldehyde resin is prepared. The prepared urea-formaldehyde resin has good viscosity, high softening point, low free formaldehyde content, environmental protection, improved water resistance, good toughness, and improved aging resistance. It is suitable for wood-based panel production. It can also be used as an adhesive in industries such as material bonding, bamboo and wood processing, paper bonding, tempered paint, and colorful pattern paint; however, the preparation process of this method is relatively complicated and the steps are cumbersome, which is not conducive to popularization

Method used

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  • Modified urea-formaldehyde glue and preparation method thereof
  • Modified urea-formaldehyde glue and preparation method thereof

Examples

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Embodiment 1

[0028] A modified urea-formaldehyde glue, comprising the following raw materials in parts by weight: 90 parts of formaldehyde solution with a mass concentration of 35%, 40 parts of urea, 1 part of melamine, an appropriate amount of liquid caustic soda with a mass concentration of 30%, an appropriate amount of formic acid, and 0.2 parts of borax 1 part, 0.05 part of antibacterial agent, 3 parts of hollow silica submicron spheres and 2 parts of water-based fluorine-modified phosphorus-containing acrylate emulsion.

[0029] Among them, the antibacterial agent is composed of polyhexamethyleneguanidine phosphate and polyhexamethyleneguanidine hydrochloride with a mass ratio of 1:3; the diameter of the hollow silica submicron sphere is 300nm, and the shell thickness is 40nm. The shell layer has a mesoporous structure, the average pore diameter of the mesopores is 3nm, and the specific surface area of ​​the hollow silica submicron sphere is 100m 2 / g.

[0030] The preparation method...

Embodiment 2

[0037] A modified urea-formaldehyde glue, comprising the following raw materials in parts by weight: 80 parts of formaldehyde solution with a mass concentration of 40%, 30 parts of urea, 0.2 part of melamine, an appropriate amount of liquid caustic soda with a mass concentration of 25%, an appropriate amount of formic acid, and 0.1 parts of borax 1 part, 0.01 part of antibacterial agent, 1 part of hollow silica submicron sphere and 1 part of aqueous fluorine-modified phosphorus-containing acrylate emulsion.

[0038] Among them, the antibacterial agent is composed of polyhexamethyleneguanidine phosphate and polyhexamethyleneguanidine hydrochloride with a mass ratio of 1:2; the diameter of the hollow silica submicron sphere is 100nm, and the shell thickness is 20nm. The shell layer has a mesoporous structure, the average pore diameter of the mesopores is 1nm, and the specific surface area of ​​the hollow silica submicron sphere is 80m 2 / g.

[0039] The preparation method of ab...

Embodiment 3

[0046] A modified urea-formaldehyde glue, comprising the following raw materials in parts by weight: 100 parts of formaldehyde solution with a mass concentration of 35%, 50 parts of urea, 3 parts of melamine, an appropriate amount of liquid caustic soda with a mass concentration of 35%, an appropriate amount of formic acid, and 0.3 parts of borax 1 part, 0.1 part of antibacterial agent, 5 parts of hollow silica submicron spheres and 5 parts of aqueous fluorine-modified phosphorus-containing acrylate emulsion.

[0047] Among them, the antibacterial agent is composed of polyhexamethyleneguanidine phosphate and polyhexamethyleneguanidine hydrochloride with a mass ratio of 1:4; the diameter of the hollow silica submicron sphere is 400nm, and the shell thickness is 50nm. The shell layer has a mesoporous structure, the average pore diameter of the mesopores is 5nm, and the specific surface area of ​​the hollow silica submicron sphere is 150m 2 / g.

[0048] The preparation method of...

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Abstract

The invention discloses modified urea-formaldehyde glue. The modified urea-formaldehyde glue is prepared from the following raw materials in parts by weight: 80 to 100 parts of formaldehyde, 30 to 50parts of urea, 0.2 to 3 parts of melamine, a suitable amount of liquid caustic soda, a suitable amount of formic acid, 0.1 to 0.3 part of borax, 0.01 to 0.1 part of an antibacterial agent, 1 to 5 parts of hollow silica submicron spheres, and 1 to 5 parts of water-based fluorine modified phosphor-containing acrylate emulsion. The invention also discloses a preparation method of the modified urea-formaldehyde glue. The modified urea-formaldehyde glue disclosed by the invention is high in water proofness, antibacterial property and moisture resistance; the sealing performance of an artificial plate can be improved, so that water and moisture are difficult to penetrate into the artificial plate, and the water resistance and the antibacterial property are improved; and therefore, the modified urea-formaldehyde glue is environment-friendly and safe.

Description

technical field [0001] The invention relates to the technical field of glue for wood-based panels, in particular to a modified urea-formaldehyde glue and a preparation method thereof. Background technique [0002] Wood-based panels are a resource-dependent industry, and the two major items of wood and chemical raw materials account for about 70% of the cost. Therefore, the production of lightweight, high-performance wood-based panels has become an important part of transformation and upgrading. The physical and mechanical properties and environmental indicators (formaldehyde emission) of wood-based panels are largely guaranteed by the adhesives used. Adhesive is the core of wood-based panels, which not only affects its quality and energy consumption, but also affects costs, and urea-formaldehyde glue accounts for 80-90% of the total adhesives used in wood-based panels. [0003] Urea-formaldehyde glue is also called urea-formaldehyde resin (UF resin), which has high bonding...

Claims

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Application Information

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IPC IPC(8): C09J161/30C09J133/04C09J11/04C09J11/08
CPCC08K2003/387C08K2201/011C08L2201/08C09J11/04C09J11/08C09J161/30C08L33/04C08K7/26C08K3/38
Inventor 陈正照
Owner 广西横县新威林板业有限公司
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