阅读说明：本技术 一种塑料用打磨剂及在塑料表面形成均匀粗糙面的方法 (Polishing agent for plastic and method for forming uniform rough surface on plastic surface ) 是由 胡军 李平 王卫国 缪培凯 吕国强 杨波 凌云剑 伍松 符饶生 于 2019-08-07 设计创作，主要内容包括：本发明公开了一种塑料用打磨剂及在塑料表面形成均匀粗糙面的方法,包括按重量份计的以下组分：丁酮50～70份、异丙醇8～20份、乙酸乙酯5～10份。与传统的手工或机械打磨方式相比,该打磨剂可打磨到制件的死角部位,保证打磨均匀性和打磨效率,且打磨程度可调,可应用于一定材质的3C产品如手机后盖等塑料装饰件的涂装前处理过程,满足无尘涂装要求,并保证薄涂时的涂装质量。(the invention discloses a polishing agent for plastics and a method for forming a uniform rough surface on the surface of the plastics, which comprises the following components in parts by weight: 50-70 parts of butanone, 8-20 parts of isopropanol and 5-10 parts of ethyl acetate. Compared with the traditional manual or mechanical polishing mode, the polishing agent can polish dead angle positions of workpieces, ensures polishing uniformity and polishing efficiency, is adjustable in polishing degree, can be applied to the coating pretreatment process of plastic decorating parts such as mobile phone rear covers and the like of 3C products made of certain materials, meets the dust-free coating requirement, and ensures coating quality in thin coating.)

1. The polishing agent for the plastic is characterized by comprising the following components in parts by weight: 50-70 parts of butanone, 8-20 parts of isopropanol and 5-10 parts of ethyl acetate.

2. A method of forming a uniform matte surface on a plastic surface, comprising:

Uniformly mixing butanone, isopropanol and ethyl acetate according to a weight ratio of (50-70) to (8-20) to (5-10) to prepare a polishing agent, then coating the polishing agent on the surface of a material, and removing the polishing agent after a period of time to form a rough surface on the surface of the material;

Wherein, the material comprises one or at least two of PC, ABS, PMMA and PVC.

3. The method according to claim 2, wherein the polishing agent is removed after being coated on the surface of the material for 20-120 s.

4. a method according to claim 2 or 3, wherein the abrasive is applied by curtain coating.

5. A method according to claim 4, characterized in that the material is placed at an inclination of 30-60 ° before the curtain coating.

6. A method according to claim 2 or 3, wherein the abrasive is removed by air pressure blow drying.

7. A method of coating a plastic article, comprising the steps of:

A method according to any one of claims 2 to 6, wherein the surface of the plastic part is roughened and then coated.

Technical Field

The invention relates to the technical field of plastic surface treatment, in particular to a polishing agent for plastics and a method for forming a uniform rough surface on the surface of the plastics.

Background

The coating on the surface of the plastic can combine the characteristics of light weight, easy molding, low price and the like of the plastic with the conductivity, permeability, weldability or decoration of the coating, thereby expanding the application field of the plastic. In order to improve the binding force between the coating and the plastic substrate, the most traditional method is manual polishing by using sand paper, the method is easy to generate a large amount of dust, the process is complicated, the treatment efficiency is low, and the method of mechanical polishing by using a polishing machine is improved in polishing efficiency, but the dead angle part is difficult to polish, an external power supply is needed, and the use is inconvenient.

For products with high appearance requirements such as 3C products and the like, manual or mechanical polishing is difficult to ensure polishing uniformity, paint film smoothness is affected when thin coating construction is carried out, such as the thickness of a paint film is less than 20 micrometers, product yield is reduced, static electricity is easily generated during polishing in winter, dust in air is easily adsorbed, and coating quality is affected.

Disclosure of Invention

When plastics are polished by a traditional manual or mechanical method, the subsequent coating quality is often influenced due to uneven polishing, and meanwhile, a large amount of dust is easily generated by the method, so that dead corners of the special-shaped parts are difficult to polish, and the special-shaped parts are inconvenient to use. In order to solve the above technical problems, embodiments of the present invention provide a polishing agent for plastics and a method for forming a uniform rough surface on a plastic surface, wherein the technical scheme is as follows:

On one hand, the grinding agent for the plastic comprises the following components in parts by weight: 50-70 parts of butanone, 8-20 parts of isopropanol and 5-10 parts of ethyl acetate.

In another aspect, there is provided a method of forming a uniform matte surface on a plastic surface, comprising:

Uniformly mixing butanone, isopropanol and ethyl acetate according to a weight ratio of (50-70) to (8-20) to (5-10) to prepare a polishing agent, then coating the polishing agent on the surface of a material, and removing the polishing agent after a period of time to form a rough surface on the surface of the material;

Wherein, the material comprises one or at least two of PC, ABS, PMMA and PVC.

Preferably, the polishing agent is coated on the surface of the material for 20-120 s and then removed.

Preferably, the coating mode of the polishing agent is curtain coating.

Preferably, the material is placed with a slant 30 ^° -60 ^° before curtain coating.

Preferably, the method for removing the grinding agent is air pressure drying.

In another aspect, a method for coating a plastic part is provided, comprising the steps of:

The method is adopted to form a rough surface on the surface of the plastic part, and then coating is carried out.

The technical scheme provided by the embodiment of the invention can at least bring the following beneficial effects:

The polishing agent is prepared from butanone, isopropanol and ethyl acetate in a certain ratio, can form fine and uniform rough surfaces on the surfaces of materials such as PC, ABS, PMMA and PVC, and has adjustable polishing degree.

Drawings

FIG. 1 shows the surface morphology of the polished materials of examples 1-2 and comparative examples 1-2 of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The embodiment provides a plastic grinding agent, which comprises the following components in parts by weight: 50-70 parts of butanone, 8-20 parts of isopropanol and 5-10 parts of ethyl acetate. Wherein, butanone is used as a strong solvent for biting materials, and ethyl acetate and isopropanol have the regulating effect and can effectively avoid the excessive biting on the surface of the plastic. The inventor finds that by adopting the components to match, fine and uniform rough surfaces can be formed on the surfaces of materials such as Polycarbonate (PC), acrylonitrile/butadiene/styrene copolymer (ABS), polymethyl methacrylate (PMMA) and polyvinyl chloride (PVC). In practical application, the proportion of each component or the residence time of the polishing agent on the surface of the material can be properly adjusted within the range according to different types of the material to obtain a polished surface with certain roughness, for example, PC, ABS or a blend thereof is easy to bite, so that when the polishing agent is applied to thin coating construction, a lower butanone addition amount can be adopted, or the polishing time can be reduced, and for PMMA materials difficult to bite, the processing method is just opposite. In an exemplary embodiment, butanone: isopropyl alcohol: the proportion of ethyl acetate is 7:2:1, the polishing time on the surface of a PC/ABS material is 30s, the polishing time on the surface of a PMMA material is 80s, and the formed rough surface can be suitable for thin coating construction with a spraying film thickness of 10-15 mu m, and can obtain better paint film appearance.

Compared with the traditional manual or mechanical polishing mode, the polishing agent can be used for polishing dead angle positions of materials, the polishing uniformity and the polishing efficiency are guaranteed, and the polishing degree is convenient to regulate and control, so that the thin coating requirement is met. Based on the advantages, the polishing agent can be applied to the coating pretreatment process of 3C products made of corresponding materials, such as plastic decorating parts of mobile phone rear covers and the like, meets the dust-free coating requirement, and ensures the coating quality in thin coating.

The embodiment also provides a method for forming a uniform rough surface on the surface of plastic, which comprises the following steps: uniformly mixing butanone, isopropanol and ethyl acetate according to a weight ratio of (50-70) to (8-20) to (5-10) to prepare a polishing agent, then coating the polishing agent on the surface of a material, and removing the polishing agent after a period of time to form a rough surface on the surface of the material; the material is selected from one or at least two of PC, ABS, PMMA and PVC. In the method, reference may be made to the aforementioned examples of the composition of the polishing agent, and the discussion is not repeated here.

The material is preferably placed in an inclined position of 30 ^° -60 ^° to enable the surface of the plastic to be quickly soaked by the polishing agent when the spraying process is adopted, the retention time of the polishing agent on the surface of the plastic is slightly different according to the material and the subsequent painting process, generally, the polishing agent is coated on the surface of each material for 20-120 s to form a uniform rough surface, the polishing efficiency is high, of course, the surface roughness of the material is increased along with the increase of the consumption of butanone and the increase of the polishing time, similar surface roughness is obtained on the surface of different materials for the same polishing agent, the polishing time may be different, and the embodiment of the polishing agent is also recorded.

After the rough surface is formed, the polishing agent can be removed by adopting an air pressure blow-drying or drying mode, the air pressure blow-drying mode is preferably adopted, the operation is simple and convenient, and the subsequent coating process can be carried out after blow-drying.

the embodiment also provides a plastic part coating method, which comprises the following steps: the method is adopted to form a rough surface on the surface of the plastic part, and then coating is carried out. The coating method of the present invention is not particularly limited, and may be a process such as spray coating or curtain coating.