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Hemp fiber reinforced injection phenolic molding compound and its preparation method

A technology of phenolic molding compound and hemp fiber, which is applied in the field of phenolic molding compound, can solve the problems that it is difficult to adapt to heat resistance and mechanical performance requirements, and mechanical properties such as poor impact strength and bending strength, so as to improve interface compatibility, Reduced water absorption and improved bending strength

Active Publication Date: 2016-07-27
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

Although the material has a high heat distortion temperature (190°C) and good insulation properties, its mechanical properties such as impact strength and bending strength are poor, and the notched impact strength is only 2.0-2.2kJ / m 2 , the bending strength is only between 70-80Mpa, it is difficult to adapt to some occasions that require high heat resistance and mechanical properties

Method used

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  • Hemp fiber reinforced injection phenolic molding compound and its preparation method
  • Hemp fiber reinforced injection phenolic molding compound and its preparation method
  • Hemp fiber reinforced injection phenolic molding compound and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Weigh the following components for later use: 100 parts of novolac resin (that is, thermoplastic phenolic resin, the same below), 10 parts of hexamethylenetetramine, 80 parts of silicon micropowder of 400-600 mesh, and 2-5 mm in length 25 parts of sisal fiber, 3 parts of magnesium hydroxide, 1 part of calcium stearate;

[0046] 2) Take silicon micropowder and titanate coupling agent equivalent to 0.5% of its dosage and place it in a ball mill tank for ball milling, control the speed of the ball mill tank to 10rpm, and the ball milling time is 10min;

[0047] 3) Take hexamethylenetetramine and pulverize it to 80 meshes, and then mix it evenly with the surface-treated silicon micropowder and other components;

[0048] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 75-90°C, and the screw rotation speed is 80rpm;

[0049] 5) After the extruded material is cooled to normal temperature, it is pulver...

Embodiment 2

[0062] 1) Weigh the following components for later use: 100 parts of novolak resin, 15 parts of hexamethylenetetramine, 50 parts of calcite of 600-800 mesh, 45 parts of sisal fiber with a length of 1-10 mm, 5 parts of magnesium hydroxide 2 parts, 2 parts of zinc stearate, 5 parts of iron red;

[0063] 2) Take calcite and aluminate coupling agent equivalent to 3% of its dosage and place it in a ball mill jar for ball milling, control the speed of the ball mill jar to 50rpm, and the ball milling time is 80min;

[0064] 3) Take hexamethylenetetramine and pulverize it to 100 meshes, then mix it evenly with surface-treated calcite and other components;

[0065] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 90-100°C, and the screw rotation speed is 90rpm;

[0066] 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 hem...

Embodiment 3

[0079] 1) Weigh the following components by weight percentage for later use: 100 parts of novolac resin, 20 parts of hexamethylenetetramine, 30 parts of calcium carbonate of 100-300 mesh, 55 parts of flax fiber with a length of 5-10 mm, oxidized 1 part calcium, 5 parts zinc stearate;

[0080] 2) Take calcium carbonate and silane coupling agent equivalent to 5% of its dosage and place it in a ball mill jar for ball milling, control the speed of the ball mill jar to 30rpm, and the ball milling time is 60min;

[0081] 3) take hexamethylenetetramine and pulverize it to 80 meshes, then mix it evenly with surface-treated calcium carbonate and other components;

[0082] 4) put the mixed material into a twin-screw extruder for extrusion, the barrel temperature of the twin-screw extruder is 75-85°C, and the screw rotation speed is 90rpm;

[0083] 5) After the extruded material is cooled to normal temperature, it is pulverized into irregular powders with a diameter of 4-6 mm to obtain ...

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Abstract

The invention discloses a fibrilia-reinforced injection-type phenol aldehyde molding compound and a preparation method thereof. The phenol aldehyde molding compound is mainly prepared from linear phenol aldehyde resin, hexamethylenetetramine, inorganic filler and fibrilia. 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 figuline 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 a phenolic molding compound, in particular to a hemp fiber reinforced injection type phenolic molding compound and a preparation method thereof. Background technique [0002] Phenolic molding compound is a composite material prepared with phenolic resin as the base material and other fillers as the main raw materials. It has excellent comprehensive properties such as low price, heat resistance, stable product size, good electrical insulation, and high mechanical properties. Widely used in electronics, electrical appliances, automobiles and other industries [2]. With the continuous development of the economy, the demand for high-performance materials continues to increase, and the performance requirements for phenolic molding compounds are also getting higher and higher, and higher requirements are put forward for the mechanical properties and heat resistance of this type of materials. [0003] In the prior art, reinforcing mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08L1/02C08K13/06C08K9/04C08K3/36C08K3/22C08K5/098C08K3/34C08K9/06C08K3/26C08K7/20C08K5/09C08J5/04B29C47/92B29C48/92
CPCB29B7/46B29B7/72B29B7/7461B29B7/90B29B9/06B29B9/12B29B9/14B29B2009/125B29C48/40B29C48/92B29C2948/92514B29C2948/92561B29C2948/9259B29C2948/92638B29C2948/92704B29C2948/92838B29C2948/92895B29C2948/92942
Inventor 钟立松刘鑫雨罗凤良曾铭刘建文
Owner 桂林金格电工电子材料科技有限公司
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