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Liquid silicone overmolding and double-shot molding component surface treatment method

A secondary molding and double-shot molding technology, applied in the direction of coating, can solve problems such as uneven distribution and irregular marks, and achieve the effect of improving tension, increasing contact area, and even and convenient application

Active Publication Date: 2019-06-25
DONGGUAN INJECTION RUBBER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned problems of uneven distribution and irregular traces, the present invention proposes a surface treatment method for liquid silicone secondary molding and double-shot molding middle parts with uniform distribution and no traces.

Method used

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  • Liquid silicone overmolding and double-shot molding component surface treatment method
  • Liquid silicone overmolding and double-shot molding component surface treatment method
  • Liquid silicone overmolding and double-shot molding component surface treatment method

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Embodiment Construction

[0018] A method for surface treatment of parts in secondary molding of liquid silicone and two-shot molding, the steps of which are as follows: S1: use plasma technology to treat the surface of parts; S2: use a liquid coating box to apply diluted primer on the surface of parts; S3: Perform injection molding. The diluted primer is prepared from the primer and additives in a volume ratio of 1:1 to 1:10. In the diluted primer, the ratio of primer to additive is 1:8. The additive is n-hexane or toluene.

[0019] The liquid coating box described in S2 includes: a box body 3, which is a cylinder without a cover, and is used to hold a diluted primer; a spherical sponge, which is used as a top cover of the cylinder, is fixedly connected to the box body 3; The pressure limiting ring 2 is installed on the box body 3 and is fixedly connected with the box body 3, and is extended from the side of the box body 3 along the axial direction; the height of the pressure limiting ring 2 is less...

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Abstract

The invention belongs to the technical field of surface treatment, and particularly relates to a liquid silicone overmolding and double-shot molding component surface treatment method. In order to solve the problems that maldistribution and irregular marks exist easily, the invention provides a liquid silicone overmolding and double-shot molding component surface treatment method with uniform distribution and no scratch. According to the technical scheme, the liquid silicone overmolding and double-shot molding component surface treatment method comprises the following steps of S1, treating thesurface of a component by adopting a plasma technology; 2, coating the surface of the component with a diluted primer coating agent by using a liquid coating box; and S3, carrying out injection molding. Preferably, the diluted primer coating agent is prepared from a primer coating agent and an additive according to the volume ratio between 1 to 1 and 1 to 10.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a method for surface treatment of secondary molding of liquid silica gel and middle part of double-shot molding. Background technique [0002] Before doing secondary molding (LIM overmolding) and double injection molding (2 Component InjectionMoldingwith Liquid Silicone Rubber), apply primer directly on the electroplated surface, metal surface such as paint sprayed and the surface of parts with high appearance requirements), so that the liquid silicone rubber Adhesion to the surface of the part. [0003] However, this method of directly applying the primer to the surface of the part makes the distribution of the primer uneven on the electroplated surface, metal surface such as paint sprayed, or the surface of parts with high appearance requirements, forming irregular marks and spots. It affects the quality of LIM overmolding and two-shot molding (2 Componen...

Claims

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Application Information

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IPC IPC(8): B29C45/14
Inventor 张佩韵
Owner DONGGUAN INJECTION RUBBER IND
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