Novolak phenolic resin microspheres and preparation method thereof

A phenolic resin and microsphere technology is applied in the field of chemical synthetic resin microspheres and its preparation, and achieves the effects of improving high temperature wear resistance, difficult to control molecular weight and high temperature

Inactive Publication Date: 2012-07-18
重庆阁林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the grinding belt is required to be soft macroscopically, but still hard microscopically, with mechanical flexibility, that is, to produce tiny cracks on the surface of the abrasive belt, so as to obtain the whole The softness of the abrasive belt, and the currently used abrasive belt adhesive does not meet the high-precision requirements

Method used

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  • Novolak phenolic resin microspheres and preparation method thereof
  • Novolak phenolic resin microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 160 grams of absolute ethanol in parts by weight, 190 grams of phenol, 200 grams of formaldehyde, 12 grams of triethylenetetramine, 4 grams of boric acid, and 2 grams of polyvinylpyrrolidone. Add the above-mentioned raw materials in the reaction device, mix them evenly, and start heating Raise the temperature, when the temperature of the material in the reaction system reaches 65°C, no longer heat, let the reaction generate heat and gradually raise the temperature of the material to 75°C, start timing when the reaction reaches the cloud point, keep the reaction temperature between 75-78°C, keep warm The reaction time is 2 hours. After the reaction is completed, the temperature of the reactant is rapidly lowered to 30° C., and the finished product is obtained through procedures such as precipitation, centrifugal separation, and drying. The resulting finished product is tested, and the performance indicators are shown in Table 1.

[0031] Table I

[0032] Ag...

Embodiment 2

[0034] Get 155 grams of absolute ethanol in parts by weight, 200 grams of phenol, 195 grams of formaldehyde, 17 grams of triethylenetetramine, 6 grams of boric acid, and 3 grams of polyvinylpyrrolidone, add the above-mentioned raw materials in the reaction device, start heating after mixing evenly Heating up, when the temperature of the material in the reaction system reaches 70°C, do not heat again, the heat generated by the reaction will gradually heat the material to 75°C, and start timing when the reaction reaches the cloud point, keep the reaction temperature between 75-78°C, keep warm The reaction time is 2.5 hours. After the reaction is completed, the temperature of the reactant is rapidly lowered to 30° C., and the finished product is obtained through procedures such as precipitation, centrifugal separation, and drying. The resulting finished product is tested, and the performance indicators are shown in Table 2.

[0035]

Embodiment 3

[0037] Get 180 grams of absolute ethanol in parts by weight, 210 grams of phenol, 195 grams of formaldehyde, 15 grams of triethylenetetramine, 10 grams of boric acid, and 3 grams of polyvinylpyrrolidone. Add the above-mentioned raw materials in the reaction device, mix them evenly, and start heating Heating up, when the temperature of the material in the reaction system reaches 70°C, do not heat again, the heat generated by the reaction will gradually heat the material to 75°C, and start timing when the reaction reaches the cloud point, keep the reaction temperature between 75-78°C, keep warm The reaction time is 2.3 hours. After the reaction is completed, the temperature of the reactant is rapidly lowered to 30° C., and the finished product is obtained through procedures such as precipitation, centrifugal separation, and drying. The resulting finished product is tested, and the performance indicators are shown in Table 3.

[0038]

[0039]

[0040] The Novolak phenolic re...

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Abstract

The invention relates to novolak phenolic resin microspheres and a preparation method thereof, and belongs to the field of chemical synthesis. The microspheres consist of the following components in part by weight: 80 to 100 parts of absolute ethanol, 95 to 105 parts of phenol, 100 to 115 parts of formaldehyde, 6 to 12 parts of triethylenetetramine, 2 to 6 parts of boric acid and 1 to 1.75 parts of polyvinylpyrrolidone. The method comprises the following steps of: sequentially feeding the reactants with heating, reacting for a certain period of time, cooling, discharging, precipitating, performing centrifugal separation, and drying. The novolak phenolic resin microspheres prepared by the method have high dispersibility, have the particle size of 5 to 50mu m, are easily mixed with other aids uniformly, have the thermal decomposition temperature of more than 450 DEG C after being cured, and have high toughness, moisture absorption property and strength; and the preparation process is short, easy to operate and low in cost, and products can be used for an organic friction material, a molding compound, a grinding wheel bonding material, a thermal insulation material, a fireproof material and the like, so the microspheres can replace the traditional phenolic resin.

Description

technical field [0001] The invention relates to a chemical synthetic resin microsphere and a preparation method thereof, in particular to a Novolak phenolic resin microsphere and a preparation method thereof. Background technique [0002] Abrasive belts are coated abrasives, also known as flexible abrasives. Compared with solid abrasive wheels, they have the advantages of flexibility, safety, higher precision and lower grinding costs during polishing. Abrasive belt grinding can process workpieces of various shapes with higher surface quality and precision requirements. In addition, abrasive belt grinding can not only process workpieces with flat, inner and outer circular surfaces, but also efficiently process surface quality and precision requirements. Tall large or odd-shaped pieces. [0003] Abrasive belt is mainly composed of substrate, abrasive and binder, and binder is a bridge connecting abrasive and substrate, and is a special substance that firmly adheres abrasive t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/10C08L39/06C08G8/10
Inventor 张文政何晓峰葛铁军
Owner 重庆阁林环保科技有限公司
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