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Dust-proof cover manufacturing method

A dustproof cover and raw material technology, applied in transportation, packaging, vehicle parts, etc., can solve problems such as troublesome, difficult to observe and replace, easy damage of dustproof cover, etc., to achieve extended service life, excellent mechanical properties, shock absorption effect Good results

Inactive Publication Date: 2005-06-29
于功宝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention aims at overcoming above-mentioned deficiencies in the prior art, and provides a kind of method that uses polyurethane elastomer material (T-PUR) to make dustproof cover; Troublesome problems observed and replaced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, select and weigh common T-PUR raw materials, first carry out drying treatment, the drying temperature is 95°C, the drying time is 2.5 hours, and the mold temperature is 30°C for injection molding. The temperature during injection molding is 120°C in the first zone, and the second zone 160°C, 220°C in the third zone, and 215°C in the nozzle. It can be judged according to the molten state flowing out of the nozzle. When the material is extruded, it is transparent and has good fluidity, and the temperature is more suitable. The injection molding machine The injection volume is 40% larger than the capacity of the molded product, and the injection pressure is 1000kg / cm 2 , the injection speed is slower than that of general-purpose resin, the screw speed is 75r.p.m during plasticization, and the back pressure is 150Kg / cm 2 , holding pressure is 700Kg / cm 2 , and then release the mold, and use the release agent of the silicone system to paint directly.

Embodiment 2

[0022] Example 2, select and weigh common T-PUR raw materials, first perform drying treatment, the drying temperature is 90 ° C, the time is 3 hours, and the mold temperature is 20 ° C for injection molding. The temperature during injection molding is 120 ° C in the first zone, and the second zone 160°C, 220°C in the third zone, and 215°C in the nozzle. It can be judged according to the molten state flowing out of the nozzle. When the material is extruded, it is transparent and has good fluidity, and the temperature is more suitable. The injection molding machine The injection volume is 40% larger than the capacity of the molded product, and the injection pressure is 800kg / cm 2 , the injection speed is slower than that of general-purpose resin, the screw speed is 50r.p.m when plasticizing, and the back pressure is 60Kg / cm 2 , holding pressure is 600Kg / cm 2 , and then release the mold, spraying with a release agent of the silicone system.

Embodiment 3

[0023] Example 3, select and weigh common T-PUR raw materials, first carry out drying treatment, the drying temperature is 100°C, the drying time is 2 hours, and the mold temperature is 40°C for injection molding. The temperature during injection molding is 120°C in the first zone, and the second zone 160°C, 220°C in the third zone, and 215°C in the nozzle. It can be judged according to the molten state flowing out of the nozzle. When the material is extruded, it is transparent and has good fluidity, and the temperature is more suitable. The injection molding machine The injection volume is 40% larger than the capacity of the molded product, and the injection pressure is 1200kg / cm 2 , the injection speed is slower than that of general-purpose resin, the screw speed is 100r.p.m during plasticization, and the back pressure is 240Kg / cm 2 , holding pressure is 800Kg / cm 2 , and then release the mold, and use the release agent of the silicone system to paint directly.

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PUM

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Abstract

The invention discloses a preparation method of a dustproof cover (sealing bowl) for an automobile steering mechanism, which is made of a polyurethane elastomer material. 2-3 hours; mold, mold temperature is 20-40°C; injection molding, injection molding temperature is: feeding section 120°C, heating section 160°C, plasticizing section 220°C, nozzle 215°C, injection molding machine injection volume ratio The capacity of molded products is 40% larger, and the injection pressure is 800-1200kg / cm 2 , when plasticizing, the screw speed is 50-100r.p.m, and the back pressure is 60-240kg / cm 2 , the holding pressure is 600-800kg / cm 2 ;Demoulding, using a mold release agent, can be sprayed or directly painted, it is a practical dust cover with a long service life and can effectively prevent the steering mechanism of the car from being worn by sand and dust.

Description

(1) Technical field: [0001] The invention relates to the technical field of auto parts, in particular to a method for preparing a dustproof cover made of polyurethane elastomer material. (2) Background technology [0002] The automobile dustproof boots (sealed bowls), shock pads, etc. used in the automobile industry are all rubber products made of rubber materials. Due to the poor wear resistance, corrosion resistance, cold resistance and weather resistance of rubber, they are used in It is easy to be damaged for about half a year. For example, the dust cover under the car is usually not easy to observe, and it is also very troublesome to replace. It often brings a lot of trouble to car maintenance, and makes the steering mechanism of the car suffer from sand and dust. To shorten and shorten the service life of the steering mechanism, a dust jacket made of polyurethane elastomer material (T-PUR) has not been seen so far. (3) Contents of the invention: [0003] The purpose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R99/00
Inventor 于功宝
Owner 于功宝