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Method for injection molding of stainless steel insert and stainless steel insert

A technology of insert injection molding, stainless steel, applied in the direction of coating, etc., to achieve the effect of simplifying the bonding structure, reducing costs, improving bonding strength and productivity

Active Publication Date: 2016-11-02
珠海溥博化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Other related technologies such as C treatment appearing on the market are about the combination of aluminum alloy and resin, and can effectively combine deformed aluminum alloy and PPS rubber, but there is no information about stainless steel
[0009] To sum up, the existing similar technology is aimed at the combination of aluminum alloy and plastic, and there is no mature technology applied to stainless steel

Method used

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  • Method for injection molding of stainless steel insert and stainless steel insert
  • Method for injection molding of stainless steel insert and stainless steel insert
  • Method for injection molding of stainless steel insert and stainless steel insert

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036]Stainless steel products with a specific structure (material 304) are degreased and cleaned, using degreasing agents commonly used in the market, such as thermal degreasing HY-201 of Pubo Chemical Co., Ltd., degreasing at a temperature of 40-65 degrees Celsius (this time Choose about 55 degrees Celsius), soak in the degreasing agent for 1 to 5 minutes (this time choose about 3 minutes);

[0037] For the sandblasting treatment of stainless steel products, choose 180# ceramic sand, and perform sandblasting at a speed of 10 Hz under a pressure of 2.0kgf, so that the stainless steel products can obtain a rough surface;

[0038] The sandblasted product is injected with PBT plastic. The temperature of the injection mold is 140-170°C (150°C is selected here). During the injection molding process, it is found that the stainless steel metal falls directly and cannot be effectively combined with the plastic.

no. 2 example

[0040] The stainless steel product (material is 304) of specific structure, carries out the sandblasting treatment with the first embodiment, then carries out further degreasing and degreasing, and the degreasing process is the same as the degreasing parameter in the first embodiment, so that the product surface is kept clean;

[0041] Put the stainless steel product into the electrolyte solution with a concentration of 8-30% (the electrolyte solution is composed of acidic or alkaline, active agent and corrosion inhibitor) for electrolysis, the voltage is 1-13V (choose about 10V here), and the time is 5 -60 minutes (choose about 30 minutes here);

[0042] The dried product is injected with PBT plastic, the temperature of the injection mold is 140-170°C (150°C is selected here), and the stainless steel product is annealed at about 150°C for one hour after injection molding;

[0043] After the stainless steel injection molded product is cooled for 4 hours, the pull-out force is ...

no. 3 example

[0045] The stainless steel product (made of 304) with a specific structure is subjected to activation treatment after the same treatment as the second embodiment (before drying) to remove the black or gray hanging ash on the surface produced by electrolysis; the activator is Pubo Chemical Co., Ltd. HY-202 (belonging to the organic acid series), the activation temperature is 20-50 degrees Celsius (choose about 20 degrees Celsius here), and the activation time is 1-10 minutes (choose about 3 minutes here), to ensure that there is no gray stain on the surface of stainless steel products The effect is better if you can also configure ultrasonic waves during activation;

[0046] Then carry out corrosion treatment, the conditions are: in the corrosion solution with a concentration of 20-40%, soak for 60-600 seconds at a temperature of 20-60 degrees Celsius; the corrosion solution includes ammonium chloride, ammonium fluoride, sodium carbonate One or more of them, the pH value of the...

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Abstract

The invention relates to a method for injection molding of a stainless steel insert and the stainless steel insert. PPS or PBT or PA is used as plastic for injection molding. The method comprises the steps that the stainless steel insert is subjected to etching treatment, specifically, the stainless steel insert is soaked in an etchant solution with the concentration being 20-40%, the soaking temperature is 20-60 DEG C, the soaking time is 60-600 s, and the etchant solution comprises one or more of ammonia chloride, ammonium fluoride and sodium carbonate; and the stainless steel insert is soaked in an adhesion treatment solution with the concentration being 5-20% for adhesion treatment, the treatment temperature is 20-70 DEG C, the treatment time is 5-20 min, and the adhesion treatment solution is an acid solution or an alkaline solution. According to the stainless steel insert formed through the method, the surface microstructure formed on the surface of the stainless steel insert is in a layered lava form, and meanwhile nanopores with the diameters being 10-100 nm are distributed in the surface of the stainless steel insert. The binding structure of stainless steel and plastic can be effectively simplified, the cost can be effectively reduced, the binding strength can be effectively improved, and the injection-molded product also has good water resistance.

Description

technical field [0001] The invention mainly relates to a method for injection molding an insert and the insert, in particular to a method for injection molding a stainless steel insert and the stainless insert. Background technique [0002] In the field of handheld electronic devices, the entire market is pursuing a large and thin appearance, which puts forward higher requirements for the mechanical parts of electronic devices, especially the mechanical parts of mobile phones and watch cases. The market is trying to reduce the thickness of products , and still hope to obtain good structural strength. [0003] In insert molding technology, especially in the application field of electronic handheld device housing or internal components, more and more metals are currently used as injection molded inserts. First put the metal into the mold, and then use the injection molding machine to inject plastic into the mold to form a whole with the metal insert. This is the injection mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/17B29C45/14C23F1/28
CPCB29C45/14B29C2045/14868C23F1/28
Inventor 熊跃生
Owner 珠海溥博化工有限公司
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