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A kind of primer and its preparation method and application

A technology of primer and mixed liquid, applied in the direction of primer, coating, etc., can solve the problems of bonding failure, toxic gas, etc., achieve the effect of stable primer, not easy to stick to the wall, and avoid more particle agglomeration

Active Publication Date: 2021-04-13
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used primer formula is an ethanol dispersion of polychlorotrifluoroethylene containing chromic acid. Due to the oxidation-reduction reaction between chromic acid and ethanol, the existing formula produces toxic gas, and due to the reaction between the two, the primer is prepared. Needs to be applied as soon as possible to avoid bond failure due to reaction between ingredients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The embodiment of the present invention also provides a kind of preparation method of primer, comprises the following steps:

[0037] (1) Take raw materials according to the following mass percentages:

[0038] 15%-20% polychlorotrifluoroethylene fine powder with particle size ≤100μm, 0.5%-1.2% surfactant, 2%-5% chromic anhydride, 2.5%-5% phosphoric acid, and the balance is water;

[0039] (2) chromic anhydride and phosphoric acid taken by weighing are dissolved in part of the water taken to obtain an acid solution, and the polychlorotrifluoroethylene fine powder and surfactants taken by weighing are mixed with the remaining water to obtain a dispersion;

[0040] (3) stirring and mixing the dispersion liquid and the acid solution to obtain a primer.

[0041] In the preparation method of the primer provided in the embodiment of the present invention, by using polychlorotrifluoroethylene fine powder with a particle size not greater than 100 μm and using a surfactant, the...

Embodiment 1

[0049] (1) take by weighing 1g chromic anhydride (chromium trioxide), 1.3g phosphoric acid, 5g distilled water, pour in the beaker and mix and stir, obtain acid solution;

[0050] (2) Take 8g particle size and mix it with 40-70 μm polychlorotrifluoroethylene fine powder and 25g distilled water to obtain mixed solution 1;

[0051] (3) Weigh 0.4g sodium lauryl sulfate and 5g distilled water and mix to obtain mixed solution 2;

[0052] (4) Pour the mixed solution 2 into the mixed solution 1, fully stir to obtain the mixed solution 3, and then pour the acid solution into the mixed solution 3;

[0053](5) Use a magnetic stirrer to stir for 30 minutes at a speed of 2500 r / min to obtain a primer.

[0054] (6) Dip a small amount of primer with a clean brush and apply it evenly on the sand blowing surface of the metal substrate. After drying, apply the second coat;

[0055] (7) After 2 coats of primer, put the metal substrate into an oven at 50-60°C for half an hour to dry.

[0056]...

Embodiment 2

[0058] (1) Take by weighing 2.3g chromic anhydride (chromium trioxide), 2.2g phosphoric acid, 10g distilled water, pour in the beaker Mix and stir, obtain acid solution;

[0059] (2) Take 8.5g particle size and mix it with 1-30 μm polychlorotrifluoroethylene fine powder and 20g distilled water to obtain mixed solution 1;

[0060] (3) Weigh 0.3g sodium lauryl sulfate and 5g distilled water and mix to obtain mixed solution 2;

[0061] (4) Pour the mixed solution 2 into the mixed solution 1, fully stir to obtain the mixed solution 3, and then pour the acid solution into the mixed solution 3;

[0062] (5) Use a magnetic stirrer to stir for 30 minutes at a speed of 3000 r / min to obtain a primer.

[0063] (6) Dip a small amount of primer with a clean brush and apply it evenly on the sand blowing surface of the metal substrate. After drying, apply the second coat;

[0064] (7) After 2 coats of primer, put the metal substrate into an oven at 50-60°C for half an hour to dry.

[0065...

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Abstract

The invention relates to a primer, a preparation method and application thereof, and belongs to the technical field of combining metal and nonmetal. The primer includes the following components in mass percentage: 15% to 20% polychlorotrifluoroethylene fine powder with particle size ≤ 100 μm, 0.5% to 1.2% surfactant, 2% to 5% chromic anhydride, 2.5% to 5% % phosphoric acid, the balance is water. The primer provided by the embodiment of the present invention uses polychlorotrifluoroethylene fine powder with a particle size not greater than 100 μm and uses a surfactant to disperse the polychlorotrifluoroethylene fine powder in water to obtain a uniform suspension, and the suspension The solution can be left for about 100 days without qualitative change, and has high stability. At the same time, the formula does not produce toxic and harmful substances, which is safe and environmentally friendly.

Description

technical field [0001] The invention relates to a primer used for thermoplastic compression molding of polychlorotrifluoroethylene and a metal substrate and a preparation method thereof, belonging to the technical field of combining metal and nonmetal. Background technique [0002] In the engine, a valve made of non-metal and metal composite is usually used to realize the switch function of the fuel pipeline. Polytrifluorochloroethylene is a non-metallic material commonly used in valves due to its good rigidity, self-lubricating property and good compatibility with liquid oxygen. [0003] Affected by the molecular composition, the surface of non-metallic materials such as polytrifluorochloroethylene is chemically inert, and it is difficult to achieve bonding with metal materials without special surface treatment. Even if it is barely bonded, its reliability is not high, and it is easy to have problems such as debonding in later use. In view of the above characteristics, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/12C09D5/00C09D7/63
CPCC08K5/41C09D5/002C09D127/12C09D7/63
Inventor 梁兵李冰涛陈慧敏尹雅楠
Owner CAPITAL AEROSPACE MACHINERY
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