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Preparation method of cotton fiber reinforced injection phenolic molding compound

A phenolic molding compound and cotton fiber technology, applied in the field of phenolic molding compound, can solve the problems of unsatisfactory mechanical properties and water absorption, and achieve the effects of improving interfacial compatibility, reducing water absorption, and enhancing cohesion.

Active Publication Date: 2016-08-17
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a new injection-molded cotton fiber-reinforced phenolic molding compound for the insufficient mechanical properties and water absorption of existing cotton fiber-reinforced phenolic molding compounds. A method for preparing plastics, the phenolic molding compound produced by this method has higher mechanical properties and lower water absorption

Method used

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  • Preparation method of cotton fiber reinforced injection phenolic molding compound
  • Preparation method of cotton fiber reinforced injection phenolic molding compound
  • Preparation method of cotton fiber reinforced injection phenolic molding compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Weigh the following components for later use: 100 parts of novolac resin (i.e. thermoplastic phenolic resin, the same below), 13 parts of hexamethylenetetramine, 80 parts of 400-mesh silicon micropowder, and 35 parts of cotton fiber with a length of 2 mm , 5 parts of magnesium hydroxide, 5 parts of calcium stearate, 6 parts of oil-soluble black;

[0045] 2) Take silicon micropowder and a titanate coupling agent equivalent to 1% of its dosage and place it in a ball mill jar for ball milling. Control the speed of the ball mill pot to 50 rpm, and the milling time is 20 minutes;

[0046] 3) Take hexamethylenetetramine and pulverize it to 80 meshes, and then mix it evenly with the surface-treated silicon micropowder and other components;

[0047] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 75-100°C, and the screw rotation speed is 70rpm;

[0048] 5) After the extruded material is cooled to norma...

Embodiment 2

[0056] 1) Weigh the following components for later use: 100 parts of novolac resin, 15 parts of hexamethylenetetramine, 50 parts of 600-mesh calcite, 45 parts of cotton fiber with a length of 3mm, 2 parts of magnesium hydroxide, stearic acid 3 parts of zinc, 4 parts of iron red;

[0057] 2) Put calcite and aluminate coupling agent equivalent to 4% of its dosage in a ball milling tank for ball milling, control the speed of the ball milling tank to 60rpm, and the ball milling time is 100min;

[0058] 3) Take hexamethylenetetramine and pulverize it to 100 meshes, then mix it evenly with surface-treated calcite and other components;

[0059] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 75-95°C, and the screw rotation speed is 90rpm;

[0060] 5) After the extruded material is cooled to normal temperature, it is pulverized into irregular powder with a diameter of 2-5 mm to obtain the cotton fiber-reinforced...

Embodiment 3

[0068] 1) Take the following components by weight percentage for later use: 100 parts of novolac resin, 18 parts of hexamethylenetetramine, 30 parts of calcium carbonate of 300 meshes, 55 parts of cotton fiber with a length of 5 mm, 1 part of calcium oxide, 2 parts stearic acid;

[0069] 2) Take calcium carbonate and a silane coupling agent equivalent to 0.5% of its dosage and place it in a ball milling tank for ball milling, control the rotating speed of the ball milling tank to 10 rpm, and the ball milling time is 120 min;

[0070] 3) take hexamethylenetetramine and pulverize it to 80 meshes, then mix it evenly with surface-treated calcium carbonate and other components;

[0071] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 80-100°C, and the screw rotation speed is 77rpm;

[0072] 5) After the extruded material is cooled to normal temperature, it is pulverized into irregular powders with a diameter ...

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Abstract

The invention discloses a preparation method of a cotton-fiber-reinforced injection-type phenol aldehyde molding compound. The phenol aldehyde molding compound is mainly prepared from linear phenol aldehyde resin, hexamethylenetetramine, inorganic filler and cotton fiber. The preparation method comprises the following steps: 1) weighing the raw materials for later use; 2) putting the inorganic filler and coupling agent in a ball mill or ball milling tank, and carrying out uniform ball milling, wherein the coupling agent accounts for 0.5-10 wt% of the inorganic filler, and the inorganic filler is one or combination of more than two of aluminum hydroxide, silicon micropowder, calcite, talcum, calcium carbonate, glass microballoon, kaolin and ceramic powder; 3) pulverizing the hexamethylenetetramine, and uniformly mixing with the surface-treated inorganic filler and the other raw materials; 4) adding the mixture into a double screw extruder, and extruding; and 5) cooling the extruded stock, and pulverizing. The phenol aldehyde molding compound prepared by the method has the advantages of higher mechanical properties and lower water absorptivity.

Description

technical field [0001] The invention relates to phenolic molding compound, in particular to a preparation method of cotton fiber reinforced injection type phenolic molding compound. Background technique [0002] Phenolic molding compounds are widely used because of their easy availability of raw materials, low cost, high mechanical strength, and stable performance. Among them, phenolic molding compounds with cotton fibers as reinforcement materials can achieve better wear resistance and mechanical properties. The invention patent No. CN1640930 and the invention patent No. CN1752136 both disclose a technical solution to improve the impact resistance and wear resistance of materials by adding cotton fibers or similar substances. However, due to the formula they choose, they can only be molded, and most of the parameters in the molding process are manually controlled by the operator, which has the disadvantages of poor molding process and low production efficiency. The inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08K5/17C08K3/22C08K3/34C08K3/26C08K7/20C08J5/04
Inventor 钟立松王明军蒋耿杰刘鑫雨文鹏
Owner 桂林金格电工电子材料科技有限公司
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