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Method for preparing phenolic resin

A phenolic resin and mixing technology is applied in the field of preparation of phenolic resin, which can solve the problems of high scrap rate and low curing strength of automobile ceiling, and achieve the effect of improving curing strength, high flexural strength and tensile strength

Active Publication Date: 2011-05-04
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low curing strength of the existing phenolic resin, the scrap rate of the car roof is too large

Method used

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  • Method for preparing phenolic resin
  • Method for preparing phenolic resin
  • Method for preparing phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix phenol and formaldehyde in a molar ratio of 1:0.5, add hydrochloric acid accounting for 1.5% by weight of phenol to the mixture for addition polymerization; distill to 120°C to remove the water in the product; then add 0.5wt% rosin pentaerythritol ester, mix well; distill the mixture at 0.02MPa, remove unreacted phenol in the mixture to 0.3wt%. Add hexamethylenetetramine to the rosin pentaerythritol ester phenolic resin according to 5wt% of the total weight, and mix well to obtain the phenolic resin.

Embodiment 2

[0024] Mix phenol and formaldehyde at a ratio of 1:0.7, add oxalic acid accounting for 3wt% of the amount of phenol to the mixture for addition polymerization, and remove by-product water through atmospheric distillation to 150°C; then add rosin accounting for 5wt% of the amount of phenol Glycerides, mixed; distill the mixture at 0.06MPa to remove unreacted phenol in the mixture to 0.2wt%. Hexamethylenetetramine is added to the rosin glyceride phenolic resin according to 6wt% of the total weight, and the phenolic resin is obtained by mixing.

Embodiment 3

[0026] Mix phenol and formaldehyde at a ratio of 1:0.9, add 0.5wt% sulfuric acid to the mixture to carry out addition polymerization reaction, and distill to 160°C under normal pressure; add polymerized rosin glycol which accounts for 8wt% of phenol quantity Ester and polymerized rosin pentaerythritol ester (the weight ratio of the two is 3:2), and mix; distill the mixture at 0.04MPa to remove unreacted phenol in the mixture to 0.25%. Add hexamethylenetetramine to the rosin glycol ester phenolic resin according to 5.5wt% of the total weight, and mix well to obtain the phenolic resin.

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Abstract

The invention discloses a method for preparing phenolic resin. The method comprises the following steps of: (1) adding phenol and aldehyde into a reaction kettle according to a molar ratio of 1:(0.5-0.9), and adding an acidic catalyst in an amount which accounts for 0.5 to 3 weight percent of the amount of the used phenol to perform addition polymerization; (2) heating a reaction product in the step (1) to the temperature of between 100 and 160 DEG C, and distilling to dehydrate; (3) adding rosin ester into a dehydrated product in the step (2) and uniformly stirring, wherein the rosin ester is in an amount which is 0.5 to 8 percent based on the amount of the used phenol; (4) distilling a mixture in the step (3) under reduced pressure until the amount of the free phenol in the mixture is less than or equal to 0.5 percent; and (5) adding a curing agent into the distilled moisture in the step (4) and uniformly mixing. A phenolic resin product prepared by the method is uniformly mixed with a cotton fiber material, the mixture is cured and formed at a high temperature to obtain a cotton fiber felt, and the felt can be manufactured into various internal ornaments of automobiles; and the felt adhered by the phenolic resin has higher rupture strength and tensile strength.

Description

technical field [0001] The invention relates to the technical field of organic polymer materials, in particular to a preparation method of phenolic resin. Background technique [0002] Felt used in automotive interiors is a material with functions such as sound insulation, heat preservation, and shock absorption. It is formed by quickly bonding and pressing loose cotton fibers through high-molecular binders at high temperatures. The polymer adhesives currently used for molding automotive interior materials are mainly phenolic resins. Due to the advantages of fast curing at high temperature, high adhesion, heat resistance, flame resistance, oil resistance, and resistance to most chemical solvents, phenolic resins can be used. be widely used. [0003] However, due to the manufacture of large interior accessories such as car roofs, the felt is required to have high flexural strength, tensile strength, etc. after hot pressing to support its own fixation, which requires a high d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/34
Inventor 唐路林胡伟魏务翠
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD