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Method for rapidly adjusting fiber content in small-scale granulation of fiber reinforced composite material

A composite material and fiber-reinforced technology, which is applied in the field of rapid adjustment of fiber content in small-scale granulation of fiber-reinforced composite materials, can solve problems such as excessive fiber content, large fluctuations in material performance, and unfavorable production guidance, and achieve clear and mastery results High-level, easy-to-operate effect

Pending Publication Date: 2021-06-25
ZHEJIANG PRET NEW MATERIALS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Given that the type, content and distribution of reinforcing fibers are critical to the performance of fiber-reinforced composites, although the final fiber content of the "finished and finished" product is generally correct, the fiber content and distribution were not monitored during production, It is easy to cause the fiber content to partially exceed the standard, resulting in large fluctuations in material performance, which seriously interferes with the formula verification process of the small test, and is not conducive to the production guidance of the pilot test
Moreover, when scraps are generated due to a midway shutdown, the final fiber content of the product can easily deviate from the set value. Unfortunately, when encountering carbon fiber, aramid fiber, hemp fiber, metal fiber, etc., the burning ash cannot be used. It is difficult to know the actual fiber content of the product when testing fiber-reinforced composite materials

Method used

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  • Method for rapidly adjusting fiber content in small-scale granulation of fiber reinforced composite material
  • Method for rapidly adjusting fiber content in small-scale granulation of fiber reinforced composite material
  • Method for rapidly adjusting fiber content in small-scale granulation of fiber reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Set the process parameters of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36) according to experience: temperature is 210-250°C, extruder speed is 480r / min, main side feeding speed is 10.0 / min 18.0. Add glass fiber to the side feeding bin of the twin-screw extruder, turn on the side feeding switch, weigh at the side feeding port for 30s, and the amount of side feeding is m=247g, and the addition percentage is set by the fiber as 50%±1% to calculate the theory The yield is 247 / (50%±1%)=484~504g, the data is for standby. Weigh 22.9KG of PA6 resin, dry at 100°C for 4 hours, weigh 1.5KG of toughening agent, 0.2KG of antioxidant, 0.25KG of lubricant, and 0.15KG of masterbatch, and mix them uniformly in a high-speed mixer to obtain a resin mixture. Add to main feed bin. Turn on the feeding switch on the main side, extrude the strands, cool, blow dry and cut into pellets, weigh the amount of pelletized material W for 30s 1 =521g, which is too larg...

Embodiment 2

[0038] Set the process parameters of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36) according to experience: temperature is 170-190°C, extruder speed is 580r / min, main side feeding speed is 13.0 / min 15.0. Add the glass fiber to the side feeding bin of the twin-screw extruder, turn on the side feeding switch, weigh at the side feeding port for 30s, and the amount of side feeding is m=192g, and the addition percentage is set by the fiber as 30%±1% to calculate the theory The yield is 192 / (30%±1%)=619~662g, the data is for standby. Weigh 6.92KG of PP, 0.04KG of antioxidant, and 0.04KG of lubricant and mix them evenly in a high-speed mixer to obtain a resin mixture, which is added to the main feeding bin. Turn on the feeding switch on the main side, extrude the strands, cool, blow dry and cut into pellets, weigh the amount of pelletized material W for 30s 1 =598g, which is relatively small compared with the theoretical output of 619~662g, so adjust th...

Embodiment 3

[0040] According to experience, set the process parameters of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio L / D=36): temperature is 260-280°C, extruder speed is 580r / min, main side feeding speed is 14.0 / min 16.0. Add glass fiber to the side feeding bin of the twin-screw extruder, turn on the side feeding switch, weigh at the side feeding port for 30s, and the amount of side feeding is m=216g, and the addition percentage is set by the fiber as 30%±1% to calculate the theory The yield is 216 / (30%±1%)=697~745g, the data is for future use. Weigh 137.6KG of PA66 resin, dry at 100°C for 4 hours, weigh 1KG of antioxidant, 1KG of lubricant, and 0.4KG of color masterbatch, mix them evenly in a high-speed mixer to obtain a resin mixture, and add it to the main feeding bin in 3 times . Turn on the feeding switch on the main side, extrude the strands, cool, blow dry and cut into pellets, weigh the amount of pelletized material W for 30s1 =667g, which is relatively s...

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Abstract

The invention discloses a method for rapidly adjusting the fiber content in small-scale granulation of a fiber reinforced composite material. According to the method, the ratio of the side feeding amount per unit time to the granulation material amount per unit time in the screw extrusion granulation process of the fiber reinforced thermoplastic composite material is used as a control index, and the fiber content change of the fiber reinforced composite material can be controlled within the error range of + / -1% within a very short time. The method is easy and convenient to operate, clear in result, effective, reliable and particularly suitable for a machine table without a weightlessness scale and the small-scale production condition, and has great significance in practical application such as material performance stability and part test failure analysis.

Description

technical field [0001] The invention relates to the field of polymer composite material processing, in particular to a method for quickly adjusting fiber content in small-scale granulation of fiber-reinforced composite materials. Background technique [0002] Fiber-reinforced composite materials have high specific strength, large specific modulus, designable material properties, and good corrosion resistance and durability. , home office and other fields. Fiber-reinforced composites are composed of reinforcing materials and matrix materials, and each part has its own role, which together affect the performance of the composite material. As a reinforcing material, fiber is an important component of composite materials, and its mass proportion in fiber composite materials can generally reach 15% to 65%, which is the main part of structural composite materials bearing load. Commonly used reinforcing fibers mainly include glass fiber, carbon fiber, aramid fiber, hemp fiber, et...

Claims

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Application Information

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IPC IPC(8): B29C48/285B29C48/92B29B9/06
CPCB29C48/2886B29C48/92B29B9/06B29C2948/92828
Inventor 陈剑锐张海生杜国毅闫廷龙徐美玲李克成蔡青周文
Owner ZHEJIANG PRET NEW MATERIALS