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Sheet for protecting automobile coating film and preparation method thereof

A coating film and automobile technology, applied in the field of automotive coating protection sheet and its preparation, can solve problems such as insufficient mechanical properties, achieve excellent pollution resistance and improve crack resistance

Active Publication Date: 2022-08-02
LG HAUSYS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, conventional coatings exhibiting self-healing properties have insufficient mechanical properties of coatings such as hardness and coating film strength.

Method used

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  • Sheet for protecting automobile coating film and preparation method thereof
  • Sheet for protecting automobile coating film and preparation method thereof
  • Sheet for protecting automobile coating film and preparation method thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0061] Another example of the present invention provides a method for preparing a sheet for protecting an automobile coating film, comprising: the steps of preparing a coating composition containing a compound containing a secondary amine group, a polyol and a polyisocyanate; and coating and The step of curing the coating composition described above to prepare a coating comprising a polyureaurethane polymer, the polyureaurethane polymer comprising urea repeating units and urethane repeating units.

[0062] As described above, an automotive coating film protection capable of exhibiting improved crack resistance and excellent scratch resistance due to improved self-healing property while exhibiting excellent stain resistance can be prepared by the above-described preparation method Use flakes. The following contents are the same as those described above, except for the contents specified in particular.

[0063] The above-mentioned sheet for protecting automotive paint films can...

Embodiment 1

[0080] Compounding a compound containing a secondary amino group (molecular weight = 550 g / mol, R in chemical formula 2 1 ~R 4 =-COOC 2 H 5 , n=1, viscosity at 25° C.=900mpasec~1300mpasec), hexamethylene diisocyanate-based trimer-type trifunctional polyisocyanate and diluting solvent to prepare the first composition. Furthermore, the 2nd composition was prepared by mix|blending the polyester-based polyol to which methyl methacrylate was grafted, the hexamethylene diisocyanate-based trimer-type trifunctional polyisocyanate, and a diluent. Then, the above-mentioned first composition and the above-mentioned second composition were mixed in a weight ratio of 9:1 to prepare a coating composition containing 30% by weight of solid content. Then, after coating the above coating composition on the polyvinyl chloride base material layer by gravure coating at a thickness of about 40 μm, it was thermally cured in an oven at 130° C. for 2 minutes and 30 seconds, thereby preparing a poly...

Embodiment 2

[0082] The above-mentioned first composition and the above-mentioned second composition are mixed in a weight ratio of 8:2 to prepare a coating composition, so that the urea repeating unit of the polyurea urethane polymer contained in the above-mentioned coating layer: urethane A sheet was prepared in the same manner as in Example 1 except that the weight ratio of the ester repeating unit was 8:2 and the glass transition temperature was 55°C.

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Abstract

The invention provides a sheet for protecting an automobile coating film. The sheet comprises a base material layer; the present invention relates to a sheet for protecting a coating film for an automobile, and a coating layer comprising a polyurea urethane polymer comprising a urea repeating unit and a urethane repeating unit, and provides a method for manufacturing a sheet for protecting a coating film for an automobile, comprises: a step for preparing a coating composition containing a compound containing a secondary amine group, a polyol, and a polyisocyanate; and preparing a coating layer containing a polyurea urethane polymer by applying and curing the coating composition on a substrate layer, wherein the polyurea urethane polymer contains a urea repeating unit and a urethane repeating unit.

Description

technical field [0001] The invention relates to a sheet for protecting automobile coating films and a preparation method thereof. Background technique [0002] Automotive painted surfaces are exposed to a variety of external contaminants, and it is critical to have high weather resistance and contamination resistance to a variety of pollution sources. In addition, during the construction of curved surfaces and expansion, cracking and film tearing should not occur in the coating on the painted surface of the car. In addition, when scratches or the like are damaged due to external impact or the like, the coating layer is also required to have self-healing properties (SELF-HEALING) that can heal itself slowly or reduce the damage. [0003] On the other hand, the existing coating layers exhibiting self-healing properties have a problem that the mechanical properties of the coating layers such as hardness and coating film strength are insufficient. Furthermore, a coating layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D7/61B60R13/04
CPCC09D7/61C09D175/02B60R13/04
Inventor 朴大进李载珉宋玟锡金世焕金寿烈
Owner LG HAUSYS LTD