Toughening and modifying method for melamine formaldehyde resin

A technology of formaldehyde resin and melamine, which is applied in the field of toughening and modification of melamine formaldehyde resin, can solve the problems of high brittleness, complicated preparation process, easy to drop blocks, etc. of melamine formaldehyde resin, and achieves low production cost, simple production process, and improved brittleness. Effect

Inactive Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of melamine formaldehyde resin in the prior art, such as high brittleness, easy block loss, and complicated preparation process, the invention provides a toughening modification method for melamine formaldehyde resin. The modification method has a good toughening effect and can be prepared Simple process and low cost

Method used

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  • Toughening and modifying method for melamine formaldehyde resin
  • Toughening and modifying method for melamine formaldehyde resin
  • Toughening and modifying method for melamine formaldehyde resin

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add hydrochloric acid to 60 parts of methylolmelamine to adjust the pH value to 4, and react in a water bath at 35°C for 8 minutes to obtain a polymer solution with a certain viscosity. Add NaOH to the polymer solution to adjust the pH value to 9. React at 75°C for 8 hours, take it out and cool it down to obtain melamine formaldehyde resin.

Embodiment 2

[0021] Add hydrochloric acid to 48 parts of methylolmelamine to adjust the pH value to 4, then add 12 parts of toughening agent polyacrylamide, and react in a water bath at 35°C for 8 minutes to obtain a polymer solution with a certain viscosity. Add NaOH to the polymer solution to adjust the pH value to 9, react at 75°C for 8 hours, take it out and cool it, and obtain the toughened melamine formaldehyde resin.

Embodiment 3

[0023] Add hydrochloric acid to 42 parts of methylolmelamine to adjust the pH value to 4, then add 18 parts of toughening agent polyacrylamide, and react in a water bath at 35°C for 8 minutes to obtain a polymer solution with a certain viscosity. Add NaOH to the polymer solution to adjust the pH value to 9, react at 75°C for 8 hours, take it out and cool it, and obtain the toughened melamine formaldehyde resin.

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Abstract

The invention discloses a toughening and modifying method for melamine formaldehyde resin. According to the toughening and modifying method, a compound containing any one or two of polyhydroxy, polycarboxy and polyamino is adopted as the toughening agent to carry out polycondensation together with methylol melamine; a flexible chain polymer is introduced into the melamine formaldehyde resin, so that the degree of crosslinking of the resin is reduced, and the toughness is improved. The toughened melamine formaldehyde resin has the breaking elongation increased from 6.3% to 89.3%. With the adoption of the toughening and modifying method for melamine formaldehyde resin, the problems of the prior art that the melamine formaldehyde resin is high in fragility and poor in toughness, the resin is easy to fall, the preparation technology is complex and the like can be solved; and the toughening and modifying method has a wide application prospect.

Description

technical field [0001] The invention relates to a method for toughening and modifying melamine formaldehyde resin, which belongs to the technical field of polymer materials. Background technique [0002] Melamine-formaldehyde resin, also known as melamine resin, is an important species of amino resin, which is obtained by polycondensation reaction of melamine and formaldehyde in acidic or alkaline medium. The resin has the advantages of colorless transparency, heat resistance, arc resistance, flame retardancy, stable product size, etc., so it is widely used in electronics, electrical appliances, construction, transportation, daily necessities and other industries. However, melamine formaldehyde resin has disadvantages such as high brittleness, poor toughness, and easy breakage of powder. Chinese patent on November 25, 2009 (publication number: CN 101585953A) discloses a preparation method of melamine formaldehyde molding compound, adjust the pH value of formaldehyde with so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C08G12/32
Inventor 李娟刘晓燕刘文堂王中华胡群爱郭建华孙举周亚贤
Owner CHINA PETROLEUM & CHEM CORP
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