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Composition used for SMC product and preparation method for SMC product

A composition and silicone technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems that the quality of the paint surface of the product cannot be completely guaranteed, the online spray cleaning and baking operation cannot be realized, and the operation controllability is poor, etc. , to achieve health, safety and environmental protection, avoid sanding and/solvent wiping, excellent primer finish

Inactive Publication Date: 2014-05-07
北京汽车玻璃钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above conventional domestic paint pre-treatment methods, we can clearly see the related disadvantages: using manual (disc) surface grinding and wiping and other manual treatment methods, the process operation is less controllable, and some quality problems are not easy to find on site. As a result, the quality of the paint surface of the final product cannot be fully guaranteed, resulting in quality fluctuations; at the same time, due to the small scale of domestic automotive SMC parts manufacturers, limited investment capacity, and relatively simple spraying equipment, most of them do not have online spray cleaning and baking devices and Its pure water generating device is temporarily unable to realize the highly mechanized on-line spray cleaning and baking operations of foreign companies

Method used

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  • Composition used for SMC product and preparation method for SMC product
  • Composition used for SMC product and preparation method for SMC product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Forming of the front mask:

[0034] According to the compression molding process of the front mask, evenly spray EM-1212SF2 water-based release agent (main components: polydimethylsilicone oil and silicone resin, Beijing Colas Chemical Technology Co., Ltd., with water) on the surface of the heated mold cavity 1: 3 pre-prepared), use the designated automotive grade SMC sheet BS-PF-012 (Beijing Automotive FRP Co., Ltd.) to cut into the designated size according to the process requirements, place it on the lower model surface of the mold, close the mold and press the product Compression molding, demoulding after reaching the specified holding time, and post-processing (including edge trimming, drilling, metal parts bonding, etc.).

[0035] 2. Surface inspection and trimming of the front mask:

[0036] Check the surface quality of the front mask parts, and partially fill the found surface defects (such as pinholes, defects, scratches, etc.) (use the same type of two-com...

Embodiment 2

[0043] 1. Forming of the front mask:

[0044] According to the compression molding process of the front mask, evenly spray EM-1212SF2 water-based mold release agent on the surface of the heated mold cavity (main components: polydimethylsilicone oil, silicone resin, Beijing Colas Chemical Technology Co., Ltd., and water press 1:4 pre-prepared), use the designated automotive grade SMC sheet BS-PF-012 (Beijing Automotive FRP Co., Ltd.) to cut into the designated size according to the process requirements, place it on the lower model surface of the mold, close the mold and press the product Compression molding, demoulding after reaching the specified holding time, and post-processing (including edge trimming, drilling, metal parts bonding, etc.).

[0045] 2. Surface inspection and trimming of the front mask:

[0046] Check the surface quality of the front mask parts, and partially fill the found surface defects (such as pinholes, defects, scratches, etc.) (use the same type of tw...

Embodiment 3

[0053] 1. Forming of the front mask:

[0054] According to the compression molding process of the front cover, apply zinc stearate powder evenly on the surface of the heated mold cavity, and use the specified automotive grade SMC sheet BS-PF-012 (Beijing Automotive FRP Co., Ltd.) to cut into the specified size according to the process requirements , placed on the lower model surface of the mold, the mold is closed and pressurized for product compression molding, and after the specified holding time is reached, the mold is removed and the parts are taken out for post-processing (including edge trimming, drilling, metal parts bonding, etc.).

[0055] 2. Surface inspection and trimming of the front mask:

[0056] Check the surface quality of the front mask parts, and partially fill the found surface defects (such as pinholes, defects, scratches, etc.) (use the same type of two-component acrylic repair putty as the SMC body substrate) and polish the defective parts. Parts with no...

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Abstract

The invention provides a composition used for an SMC product. The composition is characterized by comprising an organosilicon modified acrylic polyurethane original paint, an aliphatic isocyanic acid curing agent and a thinner, wherein a weight ratio of the organosilicon modified acrylic polyurethane original paint to the aliphatic isocyanic acid curing agent to the thinner is 5-8: 1: 2-6. The invention further provides a preparation method for the SMC product. The method comprises the following steps: spraying an outer mold releasing agent on the surface of the cavity of a heated mold; cutting an SMC sheet material into a desired size and disposing the cut SMC sheet material on the molded surface of the lower mold of the mold; and carrying out die locking, pressurization and compression molding, then carrying out demolding and taking out the prepared product. The invention is characterized in that the composition provided by the invention is sprayed onto the SMC product. With the composition and the preparation method for the SMC product, an excellent primer surface can be obtained, the pre-treatment procedures for a paint like overall polishing and / or solvent wiping and alkali lye / pure water on-line spraying, cleaning and baking are omitted, and operation procedures are reduced, thereby saving production cost.

Description

technical field [0001] The present invention relates to a composition for SMC products and a method for preparing SMC products. Background technique [0002] As a relatively mature material and process, SMC has been widely used in the field of heavy trucks at home and abroad, especially in the body outer covering parts, due to its large design freedom, light weight and high strength, corrosion resistance, and one-time molding. It meets the requirements of streamlined design and light weight of heavy truck models. In order to obtain a good exterior decoration effect of the vehicle, it is often necessary to spray paint the vehicle body and related parts. Generally, a layer of primer is sprayed on the surface of the formed part, and then the top coat is sprayed. Primer spraying is particularly important. It must not only meet the technical quality requirements for the treatment and adhesion of the body and its component substrates, but also meet the relevant technical quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/12C08J7/04B29C33/62
Inventor 孙巍郑学森周妮娜
Owner 北京汽车玻璃钢有限公司
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