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Electrostatic spraying process

An electrostatic spraying and crafting technology, applied in coatings, devices for coating liquid on surfaces, special surfaces, etc., can solve environmental problems such as coating hardness, failure to reach 2H level, difficulty in meeting green coating requirements, etc.

Pending Publication Date: 2021-07-27
CHINA RAILWAY CONSTR HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process is widely used, it also has the following disadvantages: in the process of pretreatment and electrophoretic primer, a large amount of waste water, waste gas and waste residue will be generated, the energy consumption is high, and it is difficult to meet the requirements of green coating
Oil-based paint is generally used for the top coat, and the hardness of the oil-based paint film usually does not reach the 2H level, and the scratch resistance and stone chip resistance cannot meet the requirements
[0003] In summary, there is an urgent need for an electrostatic spraying process to solve the environmental protection problems and the low hardness of the coating in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (workpiece is the agricultural machinery product sheet piece that does not have corrosion):

[0034] A kind of electrostatic spraying process, comprises the following steps:

[0035] Step 1, degreasing, degreasing the workpiece;

[0036] Step 2, first-level water washing, washing the degreased workpiece at least twice, including the first pure water washing;

[0037] Step 3, pretreatment, spraying the workpiece with a pretreatment agent;

[0038] Step 4, secondary water washing, the workpiece after spraying is subjected to pure water washing for the second time;

[0039] Step 5, intermediate treatment, dewatering, intermediate drying and first strong cooling treatment on the cleaned workpiece;

[0040] Step 6, spraying the powder coating, spraying the bottom powder coating and the surface layer powder coating successively to the surface of the workpiece after the intermediate treatment;

[0041] Step 7, post-processing, the workpiece after spraying is b...

Embodiment 2

[0056] Embodiment 2 (workpiece is the agricultural machinery product sheet piece that does not have corrosion):

[0057] Different from Example 1, in the step 1, the operating temperature of the alkaline degreasing liquid is 40°C, in the step 5, the drying temperature of the intermediate drying is 90°C, and the drying The time is 12 minutes. In the step 6, the thicknesses of the primer powder coating and the surface coating are 60 μm and 62 μm respectively.

Embodiment 3

[0058] Embodiment 3 (workpiece is the thin plate of agricultural machinery product that corrodes):

[0059] The difference from Example 1 is that in the step 2, the first tap water washing, rust removal cleaning, second tap water washing and first pure water washing are carried out in sequence, and the rust removal cleaning adopts a pH value of 6.5-7.5 neutral cleaning solution to spray and clean the workpiece. The cleaning temperature is 50°C and the spraying time is 3 minutes to remove the rust on the surface of the workpiece. The components of the neutral cleaning solution include surfactants, accelerators and corrosion inhibitors. agent;

[0060] The second tap water washing is to use tap water to spray and clean the workpiece after derusting and cleaning, so as to remove the residual neutral cleaning solution on the surface of the workpiece;

[0061] In said step 3, the spray time is 3min;

[0062] In the step 5, the drying temperature of the intermediate drying is 90°C...

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Abstract

The invention provides an electrostatic spraying process. The electrostatic spraying process is characterized by comprising the following steps: step 1, degreasing, specially, degreasing a workpiece; Step 2, primary water washing, specially, carrying out at least two times of water washing on the degreased workpiece, and including primary pure water washing; 3, pretreatment, specifically, spraying the workpiece with a pretreatment agent; 4, secondary water washing, specifically, carrying out secondary pure water washing on the sprayed workpiece; 5, intermediate treatment, specifically, carrying out dewatering, intermediate drying and first-time forced cooling treatment on the cleaned workpiece; 6, powder coating spraying, specifically, sequentially spraying bottom-layer powder coating and surface-layer powder coating on the surface of the workpiece subjected to intermediate treatment; and 7, post-treatment, specifically, carrying out baking curing and secondary forced cooling treatment on the sprayed workpiece. According to the electrostatic spraying process, the coating is thick in film forming, uniform in color, and good in appearance, and has good anti-corrosion protection performance, good hardness, good adhesion, good weather resistance and good aging resistance.

Description

technical field [0001] The invention relates to the technical field of spraying technology, in particular to an electrostatic spraying technology. Background technique [0002] Agricultural machinery products are mainly thin plate parts, and the spraying process is an important link in the manufacturing process. The coating formed on the agricultural machinery products by the spraying process mainly provides decoration and protection functions for the agricultural machinery products. Coating quality directly affects the appearance quality and service life of agricultural machinery products. Due to the particularity of the environment in which agricultural machinery products are used, the coating is required to have excellent scratch resistance and stone chip resistance, especially excellent anti-corrosion performance and aging resistance. At present, there are many spraying processes for thin plate parts, among which the combination process of pretreatment + electrophoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/06B05D1/36B05D3/00B05D3/02B05D3/04B05D3/10B05D5/00B05D7/00
CPCB05D1/06B05D1/36B05D3/002B05D3/0254B05D3/0413B05D3/10B05D5/00B05D7/54B05D2401/32B05D2508/00
Inventor 张静曾羽燕刘汉平吕加鹏雷惊天梅延滨高世文杨力强道嘎周启谭亮杜冯锦
Owner CHINA RAILWAY CONSTR HEAVY IND
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