Fiber reinforcement injection molding product and injection molding method thereof

A fiber-reinforced technology for injection molding products, applied in the production of bulk chemicals, etc., can solve the problems of long molding cycle, development restrictions of fiber-reinforced thermoplastic products, and reduced fluidity, and achieve high dimensional stability, good appearance quality, The effect of improving liquidity

Active Publication Date: 2010-05-26
BEIJING CHN TOP MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluidity of thermoplastic resin materials containing fibers is reduced when injection filling the cavity, and there are problems such as insufficient filling, fiber exposure, large warping deformation, and subsequent processing difficulties during injection molding.
Due to these problems, fiber-reinforced thermoplastic products are limited in the development of thin-walled products
In the supercritical state (nitrogen: temperature higher than -147°C and pressure higher than 3.4MPa; carbon dioxide: temperature higher than 31°C and pressure higher than 7.1MPa) a certain amount of nitrogen or carbon dioxide can be completely dissolved in the molten resin to make the molten resin Improvement of fluidity, such as the patent ZL01801653.7 "Thermoplastic Resin Injection Molding Method" authorized on February 16, 2005 discloses a thermoplastic resin injection molding method, specifically dissolving ca

Method used

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  • Fiber reinforcement injection molding product and injection molding method thereof
  • Fiber reinforcement injection molding product and injection molding method thereof
  • Fiber reinforcement injection molding product and injection molding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The labels in the accompanying drawings represent: 1-appearance surface, 2-fiber, 3-resin surface layer without fiber, 4-bubble;

[0018] A kind of 42 " LCD TV front shell, 1035 * 640mm, wall thickness is 2.4 millimeters, and resin raw material is ABS / PMMA material, contains the glass fiber of 30%. Arrange channels in the cavity mold that forms appearance surface 1, supply steam Or cooling water passes through to achieve rapid heating and cooling of the cavity surface, and the surface of the cavity forming the appearance surface is polished to form a mirror effect; eight-point glue is used; and the core cavity mold forming a non-appearance surface is 80 ℃ hot water cooling. The injection molding machine adopts Haitian injection molding machine. The plasticizing system is based on the plasticizing device disclosed in the patent ZL200820057051.8 authorized on February 4, 2009. The diameter of the screw is 85mm; supercritical nitrogen is used as the plasticizer and Foaming...

Embodiment 2

[0022] The difference from Example 1 is that the amount of injected nitrogen gas is changed to 0.1%, and the pressure of the melt is set to 80MPa during injection. After the mixture is filled, the cooling water below 25°C is immediately inserted into the cooling channel of the cavity mold. Make the surface temperature of the mold cavity surface drop to 80°C, and then open the mold and take the parts. The appearance surface of the obtained product is bright, without foam marks, weld marks, and fiber exposure; the size of the product meets the design requirements, and the warping deformation is small; the product is cut open, and the appearance surface can be observed under a 100-fold microscope The surface layer has a fiber-free resin layer 3 about 15 microns thick, and there are a large number of air bubbles 4 and fibers 2 with a diameter of less than 30 microns in the core.

Embodiment 3

[0024] Another example, the product of one of the products of the present invention: the map bag at the bottom of the car door panel, 600mm * 130mm, the wall thickness is 2mm, and the raw material used is polypropylene (PP)+15% glass fiber. Channels are opened in the cavity mold of the forming appearance surface for steam or cooling water to pass through, and the cavity surface of the forming appearance surface is etched; while other parts of the mold are cooled by 50°C hot water. In practice, the injection rate of nitrogen is 0.7%, and the pressure in the cylinder is 15MPa. Before injection, steam at 180°C is introduced into the cavity mold forming the appearance surface, the surface temperature of the cavity is rapidly raised to 100°C, and the injection melt pressure is set at 50MPa. Put cooling water below 25°C into the cooling channel to lower the surface temperature of the mold cavity to 50°C, and open the mold to take out the parts. The appearance surface of the obtaine...

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Abstract

The invention relates to an injection molding product, in particular to a thermoplastic resin thin-wall product which has fiber content ranging from 10% to 30% and the injection molding method thereof. The product of the invention has a wall thickness ranging from 1.5mm to 2.5mm, and one or more than one surface of the product is provided with a layer of resin surface layer free from fiber, which has a thickness ranging from 5 mu to 15 mu; the product is composed of thermoplastic resin, thermoplastic fiber and nitrogen or carbon dioxide and the raw materials are calculated according to proportion by weight, wherein the content of the thermoplastic resin ranges from 69.95% to 89.95%, the content of the fiber ranges from 10% to 30%, the rest is nitrogen or carbon dioxide. The product and the method of the invention have the advantages of adopting supercritical nitrogen or carbon dioxide as plasticizer, further improving flowability by raising the surface temperature of the tool cavity before injection and obtaining lighter and thinner product by cooling the surface temperature of the tool cavity to relatively low temperature after the completion of injection; in addition, the product features fine apparent mass, high strength and high dimensional stability.

Description

technical field [0001] The invention relates to an injection molding product, in particular to a thermoplastic resin thin-walled product with a fiber content of 10-30% and an injection molding method. Background technique [0002] Thermoplastic products have been used more and more widely in various fields, especially in the fields of automobiles, electronics / electrical appliances, office equipment, and medical treatment. As a result, customers expect products to be thinner and lighter, and at the same time have higher and higher requirements for appearance quality, dimensional accuracy and stability. Adding a certain amount of fiber, such as glass fiber, plant fiber, etc., to thermoplastic resin can improve the strength, heat resistance and heat distortion temperature of the product, reduce shrinkage, etc., so that when the same strength is achieved, the product’s The wall thickness is reduced, thereby reducing the amount of thermoplastic resin used, and reducing the quali...

Claims

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Application Information

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IPC IPC(8): C08L55/02C08L33/12C08K7/14C08K3/02C08L23/12C08K3/20C08K7/06C08K7/02B29C45/76
CPCY02P20/54
Inventor 唐庆华
Owner BEIJING CHN TOP MACHINERY
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