Modified phenol formaldehyde resin and preparation method thereof

A phenolic resin, modified technology, applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive type, adhesive, etc., can solve the problem of poor adhesion and friction performance of friction materials, poor adhesion and friction performance , Low toughness and strength of phenolic resin, etc., to achieve good adhesion and friction performance, improve toughness and strength, and high reactivity

Active Publication Date: 2012-10-31
HUANGSHI JINZHAOYANG POWDER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular structure of the modified lignin contains a large number of benzene ring structures, so that the toughness and strength of the phenolic resin made of the modified lignin are low, and the bonding performance of the phenolic resin adhesive made of the phenolic resin is low. poor friction performance
Therefore, the adhesion and friction properties of friction materials made of phenolic resin adhesives are poor, and friction materials can only be used in fields with lower requirements for adhesion and friction properties, and the application range is relatively single

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the modified phenolic resin in the embodiment of the present invention includes the following steps: adding 100 parts of phenol, 10 to 200 parts of lignin and 1 to 20 parts of acidic catalyst into the reaction kettle by mass parts, Constant temperature reaction at ℃ for 2 to 8 hours to form a reaction solution; keep the temperature of the reaction solution between 60 ℃ and 110 ℃, add 50 to 200 parts of formaldehyde solution in stages, add 2 to 20 parts of composite catalyst, React at constant temperature for 1 to 5 hours to form viscous matter; wash the viscous matter in water at 60°C to 70°C for 2 to 5 times, and dehydrate and dry at 120°C to 150°C in a vacuum drying oven , and then dehydration and drying under reduced pressure at a vacuum pressure of 0.05Mpa to 0.1Mpa and a temperature of 110°C to 140°C to obtain a lignin phenolic resin; grind the lignin phenolic resin to 200 meshes and add 2 to 20 parts with a fineness of 100 ~300 mesh powde...

Embodiment 1

[0024] Example 1: Selection of sodium lignosulfonate A modified phenolic resin with a free phenol content of 2.0% and a thermal decomposition temperature of 400° C. was prepared according to the above preparation method.

[0025] 100.0g phenol, 50.0g fineness are 200 mesh sodium lignosulfonate and the acidic catalyst (1.0g of acidic catalyst altogether) that is made up of 1.0g concentrated sulfuric acid joins in the reactor (there are thermometer, stirring and reflux condensation in the reactor device), the temperature was slowly raised to 150° C., and then reacted at a constant temperature for 4 hours to form a reaction liquid. After reaction solution is cooled to 80 ℃, adding 40.0g concentration is the formaldehyde solution of 37% and the composite catalyst (2.0g of composite catalyst) that is compounded by 1.0g sodium hydroxide, 0.5g magnesium sulfate, 0.5g manganese sulfate, After heating up to 100°C, react at a constant temperature for 20 minutes; then add 100.0 g of form...

Embodiment 2

[0026] Example 2: Selection of high-boiling alcohol lignin A modified phenolic resin with a free phenol content of 3.6% and a thermal decomposition temperature of 417° C. was prepared according to the above preparation method.

[0027] 100.0g phenol, 10.0g high boiling alcohol lignin and the acidic catalyst (acidic catalyst total 8.0g) that are made up of 5.0g vitriol oil and 3.0g phosphoric acid are added in the reactor (there are thermometer, stirring and reflux condensation device in the reactor ), the temperature was slowly raised to 150° C. and then reacted at a constant temperature for 2 hours to form a reaction liquid. After reaction solution is cooled to 70 ℃, add 27.0g concentration and be the formaldehyde solution of 37% and the composite catalyst that forms by 2.0g sodium hydroxide, 2.0g potassium hydroxide, 1.0g copper sulfate (composite catalyst is 5.0g altogether) , after slowly raising the temperature to 80°C, react at a constant temperature for 120 minutes, the...

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Abstract

The invention discloses a modified phenol formaldehyde resin and a preparation method thereof, relating to the field of phenol formaldehyde resins. The preparation method comprises the following steps: reacting 100 parts of phenol, 10-200 parts of lignin and 1-20 parts of acidic catalyst at 80-200 DEG C for 2-8 hours to form a reaction liquid; regulating the temperature of the reaction liquid to 60-110 DEG C, adding 50-200 parts of formaldehyde and 2-20 parts of composite catalyst, and reacting for 1-5 hours to form a sticky matter; washing the sticky matter in 60-70 DEG C water 2-5 times, and dehydrating to obtain a lignin phenol formaldehyde resin; and pulverizing the lignin phenol formaldehyde resin to 200 meshes, and evenly mixing with 2-20 parts of powder nitrile-butadiene rubber to obtain the modified phenol formaldehyde resin. The free phenol content of the modified phenol formaldehyde resin is 2-5%, the thermal decomposition temperature is 400-490 DEG C, the toughness and strength are high, and the friction material prepared from the modified phenol formaldehyde resin has high adhesive property and frictional property.

Description

technical field [0001] The invention relates to the field of phenolic resins, in particular to a modified phenolic resin and a preparation method thereof. Background technique [0002] Phenolic resin adhesive is an adhesive made from phenolic resin. Existing phenolic resins are generally made by the reaction of phenol and formaldehyde. However, due to the high price of phenol and serious environmental pollution, the phenolic resin adhesive industry has been trying to find a renewable and high-performance raw material to replace phenol. Phenolic resin adhesive. Lignin is cheap and renewable. Lignin can replace most of phenol and formaldehyde to prepare phenolic resin, which can not only reduce the manufacturing cost of phenolic resin, but also the phenolic resin adhesive prepared from phenolic resin can be recycled and reused, which is more environmentally friendly. [0003] But there is following deficiency when existing phenolic resin prepares phenolic resin adhesive: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/00C08L9/02C08G16/06C08H7/00C09J161/00C08J5/14
Inventor 袁文来夏涛
Owner HUANGSHI JINZHAOYANG POWDER MATERIALS
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