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Plastic surfaces having enhanced hardness and methods of making the same

A technology to enhance plastics and hardness, applied in polyester coatings, epoxy resin coatings, coatings, etc.

Inactive Publication Date: 2018-02-16
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with the application of various coating materials, polycarbonate can only achieve a surface hardness equal to or less than 3H measured using a 1 kg load according to ASTM D3363

Method used

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  • Plastic surfaces having enhanced hardness and methods of making the same
  • Plastic surfaces having enhanced hardness and methods of making the same
  • Plastic surfaces having enhanced hardness and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1. Preparation of Coated Articles.

[0052] For base products, choose from four different types such as polycarbonate (PC) (LEXAN TM LS1, bisphenol A (BPA) polycarbonate), PC with glass fibers (LEXAN TM EXL4419, BPA polycarbonate with 9wt% glass fiber), polyester modified PC (XYLEX TM 7300, BPA polycarbonate with 30-40 wt% cycloaliphatic polyester), PC with glass fiber and polyester (XYLEX TM EXCY 0477, BPA polycarbonate with 20-30 wt% cycloaliphatic polyester and 15% glass fiber). A base product having a thickness of 1.5 mm was used for each type of product. PC with glass fiber and polyester (XYLEX TM Basic product of EXCY 0477).

[0053] The coating composition is the DG series sold by HK Networks Co. Ltd. The same coating composition was used for all coated samples.

[0054] The coating composition is wet applied to the base article using a rod coater. The wet coating had a thickness of 45.5 microns. The coating was dried at 60°C for 10 minutes...

Embodiment 2

[0056] Example 2. Testing the surface hardness and adhesion of the hardened films.

[0057]Hardness was tested using ASTM D3363 using a 1 kg load. The hardness test consisted of five repeated measurements through the pencil hardness test procedure, which is the hardness of the pencil used for the test when no measurement results in apparent scratches or other disturbances. For example, if a 3H pencil is used for five test procedures, and no appearance disturbances occur, then the pencil hardness of the material is at least 3H. On the scale of 9B (softest), 8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H (hardest) Measure pencil hardness.

[0058] Adhesion between the hardened film and the base article was measured using ASTM D3002. The test is performed by making a series of cuts in the coating in a grid pattern. Adhesion was classified based on the level of flaking or separation of the coating that occurred in the squares of the grid. For ISO Cl...

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Abstract

Various embodiments of the present invention relate to plastic surfaces having enhanced hardness and methods of making the same. In various embodiments, the present invention provides a method of enhancing hardness of a plastic surface. The method can include coating a surface of a solid plastic form including a filler, a polyester, or a combination thereof, with a flowable curable coating composition. The method can also include curing the curable coating composition, to provide a hardened film on the solid plastic form surface.

Description

Background technique [0001] Polycarbonate is often used as an optical material due to its combination of good optical and mechanical properties, light weight and ease of mass production. However, polycarbonate has poor scratch resistance. Various hard coating materials have been developed, such as melamine-based, acrylic-based and urethane-based chemistries. However, polycarbonate can only achieve a surface hardness equal to or less than 3H as measured using a 1 kg load according to ASTM D3363 even when various coating materials are applied. Contents of the invention [0002] In various embodiments, a method of enhancing the hardness of a plastic surface is provided. The method includes coating a surface of a solid plastic form comprising a filler, polyester, or a combination thereof with a flowable curable coating composition. Condition a), condition b) or conditions a) and b) are met. In condition a), the flowable curable coating composition comprises a weight average ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J7/16C08J7/043C08J7/046
CPCC08J7/16C08J2369/00C08J2463/00C08J2467/00C08J2483/04C08J7/0427C09D163/00C09D167/00C09D183/04C08J7/046C08J2483/06
Inventor 崔钟民李春任
Owner SABIC GLOBAL TECH BV