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Pearl essence coated polymer microspheres and preparation method and application thereof

A pearlescent powder and polymer technology, which is applied in the treatment of dyed polymer organic compounds, can solve the problems of easy occurrence of flow marks, formation of flow marks and weld lines, and unstable flow rate, so as to improve shear resistance and reduce welding Line, the effect of improving compatibility

Inactive Publication Date: 2015-05-20
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many disadvantages in the spraying process: high cost, long production process, low efficiency, and high rate of defective products; it is not environmentally friendly, pollutes the environment, endangers the physical and mental health of operators, and has a large safety risk; the paint surface is easy to fall off, resulting in poor appearance of the product and affecting Product grade; difficult to recycle products and defective products
[0003] In order to make the product have a special pearlescent effect, pearlescent powder is usually added to the matrix resin, and the pearlescent powder and the pearlescent powder are connected to each other to form a continuous pearlescent effect film, which covers the substrate and presents a pearlescent texture; however, By directly adding pearlescent powder to the matrix resin, the compatibility between the matrix resin and the pearlescent powder is poor. Flow marks; especially for products with complex structures, pearlescent powder oriented along the flow direction will cause uneven distribution of pearlescent powder in the melt, even in the product Defects such as flow marks and weld lines formed on the surface severely limit the market promotion and application of spray-free materials
[0004] So far, about coating the pearlescent powder in the aqueous polymer dispersion, spray drying and cross-linking reaction to form polymer-coated pearlescent powder microspheres, and then passing the polymer-coated pearlescent powder microspheres and matrix resin through Coating-free materials are produced by blending and extrusion, so as to finally make spray-free materials with no flow marks and light weld lines are rarely reported

Method used

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  • Pearl essence coated polymer microspheres and preparation method and application thereof
  • Pearl essence coated polymer microspheres and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6  and comparative example 1-3

[0028] According to the formulas of Examples 1-6 and Comparative Examples 1-2 in Table 1, slowly add surface-treated pearlescent powder / water-based pearlescent powder slurry to the aqueous polymer dispersion at room temperature, and add curing agent and / or For other additives, continue to stir for 30-120 minutes, so that the pearl powder is fully dispersed and covered by the aqueous polymer dispersion, and the composite dispersion of the polymer-coated pearl powder is obtained; the obtained composite dispersion is spray-dried. During the drying process, the small droplets of polymer-coated pearl powder formed by spraying are cured and cross-linked by the curing agent to obtain microspheres of polymer-coated pearl powder; the temperature of the air inlet during the spray drying process is 150-300°C , The outlet temperature is 50-130°C.

[0029] Table 1

[0030]

Embodiment 1

[0031] Embodiment 1: the pearlescent powder is a mica-coated pearlescent powder, and the metal oxide coated on its surface is titanium oxide; the particle size is 5 μm; the aqueous polymer dispersion is a polyacrylate emulsion, and its solid content is 10wt%; the curing agent For amino resins.

Embodiment 2

[0032] Example 2: the pearlescent powder is bismuth oxychloride crystalline pearlescent powder, and the metal oxides coated on its surface are titanium dioxide and chromium oxide; the particle size is 100 μm; the aqueous polymer dispersion is polyurethane emulsion, and its solid content is 50wt% ; Curing agent is polyisocyanate, other additives are 0.4wt% silicone defoamer and 0.4wt% polycarboxylic acid dispersant.

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Abstract

The invention discloses pearl essence coated polymer microspheres. The microspheres comprise the following components: 5-80wt% of pearl essence / aqueous pearl essence paste, 18-90 wt% of an aqueous polymer dispersion liquid and 0.2-10 wt% of a curing agent. A preparation method includes the steps of: a) slowly adding the pearl essence / aqueous pearl essence paste subjected to surface treatment into the aqueous polymer dispersion liquid at room temperature, stirring while adding the curing agent, and continuing stirring for 30-120 min to obtain a pearl essence coated polymer composite dispersion liquid; and b) conducting spray drying on the composite dispersion liquid, subjecting the pearl essence coated polymer droplets formed by spray to curing crosslinking reaction through the curing agent, so as to obtain the pearl essence coated polymer microspheres. The prepared pearl essence coated polymer microspheres can improve the compatibility between pearl essence and the matrix resin, improve the flow uniformity of pearl essence with a melt in an extrusion or injection molding process and, thereby eliminating flow mark on the surface of the product, and reduce the weld bond. Therefore, the invention can be used in the preparation of free-spraying materials.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to polymer-coated pearl powder microspheres and a preparation method and application thereof. Background technique [0002] In order to improve the appearance of plastic products and prolong the life of products, it is usually necessary to spray the surface of plastic products. However, there are many disadvantages in the spraying process: high cost, long production process, low efficiency, and high rate of defective products; it is not environmentally friendly, pollutes the environment, endangers the physical and mental health of operators, and has a large safety risk; the paint surface is easy to fall off, resulting in poor appearance of the product and affecting Product grade; it is difficult to recycle products and defective products. As people pay more and more attention to environmental issues, spray-free material products are gradually showing their com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C09C3/10
Inventor 陈平绪叶南飚胡纲宁方林孙雅杰宋晓辉王大中
Owner KINGFA SCI & TECH CO LTD
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