Microsphere thermosetting phenolic resin and its preparation process

A phenolic resin and thermosetting technology, which is applied in the field of microspherical thermosetting phenolic resin and its production process, can solve the problems of unsatisfactory application effect, oxidation, and high price of domestic resins, and achieve poor comprehensive performance, easy control, and high fineness. Effect

Inactive Publication Date: 2003-09-24
莱州市恒力达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of modern industry, the requirements for the performance of friction materials are also constantly increasing. Performance, the brake disc (sheet) should be heat-resistant and wear-resistant, so that the brakes are stable; phenolic resin is an important component of friction materials, due to its own structural characteristics, it has better heat resistance And high viscosity, its various properties and physical and chemical indicators directly affect the performance of friction material products. The traditional phenolic resin has poor toughness and low thermal decomposition temperature. Oxidation, thermal decomposition from 300-360 ° C, which is very unfavorable for friction materials to maintain a stable friction coefficient and reduce wear at high temperatures; The total demand for resin has reached 15,000 tons. Because the application effect of domestic resin is not satisfactory, most of them mainly rely on foreign imports, such as the United States, Canada, etc., and the price is very high. Therefore, how to prepare a resin with high thermal stability , and has good toughness and adhesion of phenolic resin to meet the needs of the friction material industry has very important practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 200kg of phenol, 200kg of industrial formaldehyde (concentration 37%), 16kg of hexamethylenetetramine, 130kg of water, and 1.3kg of polyvinyl alcohol resin, add them to the reaction kettle, stir well, and start heating to raise the temperature. When the temperature rises to 70°C , stop heating, and make the temperature in the kettle rise slowly to 82°C. And observe whether there is a reaction point in the material in the kettle (that is, the material changes from clear to dark, and turbidity begins to appear), when reaching the reaction point, start timing, and keep the reaction temperature at 82 ± 2 ° C, and the reaction time is 110 minutes; Cool down to below 40°C and discharge the material, add 2-3 times the water to wash the released material, and send it to the filter for filtration. The washed and filtered material is dried with a dryer, and it becomes microspherical thermosetting phenolic resin after drying. Finished product, packed for storage.

[0022] Th...

Embodiment 2

[0029] Get 250kg of cresol, 230kg of industrial formaldehyde (concentration 37%), 18kg of hexamethylenetetramine, 145kg of water, and 1.45kg of polyvinyl alcohol resin. ℃, stop heating, make the temperature in the kettle rise slowly to 83℃, and observe whether there is a reaction point in the material in the kettle. When the reaction point is reached, start timing, and keep the reaction temperature at 83±2℃, and the reaction time is 115 minutes; After the end, quickly cool down to below 40°C and discharge the material, wash the discharged material with 2-3 times of water, and send it to the filter for filtration. The washed and filtered material is dried with a dryer, and it becomes a microsphere after drying. Finished product of thermosetting phenolic resin, packaged and stored.

[0030] The above-mentioned finished resin was taken for performance index testing, and the results are shown in Table 3:

[0031] Free phenol content

Embodiment 3

[0033] Take 330kg of phenol, 330kg of industrial formaldehyde (concentration 37%), 30kg of hexamethylenetetramine, 240kg of water, and 2.25kg of polyvinyl alcohol resin, add them to the reaction kettle, stir well, and start to heat up, when the temperature rises to 70°C , stop heating, make the temperature in the kettle rise slowly to 81°C, and observe whether the material in the kettle reaches the reaction point. When reaching the reaction point, start timing, and keep the reaction temperature at 81±2°C, and the reaction time is 120 minutes; the reaction is over After cooling down rapidly to below 40°C, discharge the material, wash the released material with 2-3 times of clean water, and send it to the filter for filtration. The washed and filtered material is dried with a dryer, and it becomes microspherical thermosetting after drying. The finished product of phenolic resin is packaged and stored.

[0034] The above-mentioned finished resin was tested for performance indicat...

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Abstract

The present invention discloses a microsphere thermosetting phenolic resin and its preparation process. It is made up by using 100-115 portions of phenol homolog, 100-115 portions of methyl aldehide,8-10 portions of hexamethenyltetraamine, 50-80 portions of water and 0.6-0.75 portions of polyvinyl alcohol resin through the processes of heating reaction, cooling and discharging material, washing with water and filtering, and drying. Said invented phenolic resin has the good heat-resisting property, its thermolysis temp. can be up to above 500 deg.C. Its toughness is good, strength is high, fineness can be up to 200-1000 meshes, so it has extensive application.

Description

technical field [0001] The invention relates to a microspherical thermosetting phenolic resin and a manufacturing process thereof, belonging to the field of chemical raw materials. Background technique [0002] With the rapid development of modern industry, the requirements for the performance of friction materials are also constantly increasing. Performance, the brake disc (sheet) should be heat-resistant and wear-resistant, so that the brakes are stable; phenolic resin is an important component of friction materials, due to its own structural characteristics, it has better heat resistance And high viscosity, its various properties and physical and chemical indicators directly affect the performance of friction material products. The traditional phenolic resin has poor toughness and low thermal decomposition temperature. Oxidation, thermal decomposition from 300-360 ° C, which is very unfavorable for friction materials to maintain a stable friction coefficient and reduce w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/08C08G8/28
Inventor 冯斌申士龙关延敏邹柏林杨春明
Owner 莱州市恒力达化工有限公司
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