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Phenolic resin for abrasive paper, and preparation method thereof

A phenolic resin, sandpaper technology, applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive type, adhesive, etc., can solve the problems of not suitable for grinding, high brittleness of phenolic resin, high drying temperature and high moisture content. Less amount, improved toughness, good compatibility

Active Publication Date: 2020-05-29
浙江自立高分子化工材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phenolic resin has high brittleness, poor flexibility, high drying temperature, and long drying time. The application has brought great restrictions, so it is necessary to toughen the phenolic resin to obtain a wider application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The application provides a preparation method of phenolic resin for sandpaper, comprising the steps of:

[0023] Phenol and aldehyde are reacted at 50-70°C for 1-4 hours under the joint action of inorganic alkali catalyst and organic amine catalyst, and then reacted at 80-90°C for 1-3 hours to obtain system A;

[0024] Add epoxy active diluent to system A, and react at 90-100°C for 2-4 hours to obtain system B;

[0025] Add propylene carbonate to system B after dehydration, and react at 60-80°C for 1-2 hours to obtain system C;

[0026] Alcohol is added to system C to adjust to a preset viscosity to obtain the phenolic resin for sandpaper.

[0027] In this example, under the action of the basic composite catalyst, the phenol and aldehyde are first carried out at low temperature, and the addition reaction of phenol and aldehyde slowly occurs, and the methylol formed by the addition reaction is gradually polycondensed. Then, the reaction temperature is increased, and un...

Embodiment 1

[0051] In the reaction kettle equipped with agitator, thermometer, vacuum gauge and heating and cooling devices, add 600g phenol and 800g mass concentration as 37% formaldehyde solution, after opening the agitator, add 6g sodium carbonate and 2g diethanolamine, and heat up to 60°C, constant temperature reaction for 2 hours; heating up to 85°C again, constant temperature reaction for 2 hours, to obtain system A;

[0052] Add 250g of ethylene glycol diglycidyl ether to system A, and keep it warm at 95°C for 3 hours to obtain system B;

[0053] System B was cooled to 50-90°C for vacuum distillation and dehydration. When the vacuum distillation dehydration reached 85°C, 120 g of propylene carbonate was added, the temperature was lowered to 75°C, and the reaction was carried out at constant temperature for 1 hour to obtain System C;

[0054] Cool down the temperature of system C to 50°C, add 100g of methanol, stir evenly and cool down to obtain a phenolic resin for sandpaper.

[0...

Embodiment 2

[0058] In the reaction kettle equipped with stirrer, thermometer, vacuum gauge and heating and cooling devices, add 600g of phenol and 800g of formaldehyde solution with a mass concentration of 37%. After starting the stirrer, add 6g of sodium hydroxide and 2g of diethanolamine, and heat up Heat up to 60°C and react at constant temperature for 2 hours; raise the temperature again to 85°C and react at constant temperature for 2 hours to obtain System A;

[0059] Add 250g of butanediol diglycidyl ether to system A, and keep the reaction at 95°C for 3 hours to obtain system B;

[0060] System B was cooled to 50-90°C for vacuum distillation and dehydration. When the vacuum distillation dehydration reached 85°C, 140 g of propylene carbonate was added, the temperature was lowered to 75°C, and the reaction was carried out at constant temperature for 1 hour to obtain System C;

[0061] Cool down the temperature of system C to 50°C, add 100g of methanol, stir evenly and cool down to ob...

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Abstract

The invention discloses a phenolic resin for abrasive paper, and a preparation method thereof. The preparation method comprises the following steps: phenol and aldehyde react for 1-4 h at the temperature of 50-70 DEG C under the combined action of an inorganic base catalyst and an organic amine catalyst, and then react for 1-3 h at the temperature of 80-90 DEG C to obtain a system A; an epoxy reactive diluent is added into the system A, and a reaction is performed at 90-100 DEG C for 2-4 h to obtain a system B; the system B is dehydrated, propylene carbonate is added, and a reaction is performed at 60-80 DEG C for 1-2 h to obtain a system C; and an alcohol is added into the system C to adjust the system C to a preset viscosity to obtain the phenolic resin for the abrasive paper. The phenolic resin prepared in the invention has good flexibility, and can improve the toughness of abrasive paper when being used as a primer for producing the abrasive paper, so that the abrasive paper has good grinding performance.

Description

technical field [0001] The application relates to the technical field of resin adhesives for mold sandpaper, in particular to phenolic resins for sandpaper and a preparation method thereof. Background technique [0002] Sandpaper is a kind of grinding material made by bonding abrasives to paper substrates through adhesives. It has the advantages of being able to be cut into any shape according to needs, and can be bent arbitrarily, and has been used more and more widely. Adhesives for sandpaper include animal glue, phenolic resin, epoxy resin, urea-formaldehyde resin, latex and varnish, etc., adding inorganic fillers such as talcum powder, and configuring adhesives, surfactants, dyes, and suitable dispersants into a suitable viscosity. Glue, used as primer or compound glue. Generally, the primer and compound glue require suitable viscosity, bonding strength, curing performance and good toughness. [0003] At present, the adhesives used in emery cloths manufactured at home ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/36C08G8/10C08G8/12C08G8/24C09J161/14
CPCC08G8/36C08G8/10C08G8/12C08G8/24C09J161/14
Inventor 李波王富成樊华锋王继满李铭
Owner 浙江自立高分子化工材料有限公司
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