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Rustproofing primer of aqueous polyvinylidene chloride, and preparation method

A technology of vinylidene chloride and anti-rust primer, which is applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of uneven rust layer due to the relationship between dosage, difficulty in controlling the thickness of the rust layer, and inability to construct, achieving excellent barrier properties, Excellent chemical stability, excellent barrier effect

Inactive Publication Date: 2007-07-25
ZHEJIANG SENLANDE PACKAGING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In order to overcome the shortcomings that it is difficult to grasp the relationship between the thickness of the rust layer and the amount of paint, and the rust layer is uneven and cannot be constructed.
At the same time, in order to overcome the disadvantage that it cannot be constructed on steel with a rust layer thickness greater than 30 μm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The formula of the water-based PVDC anti-rust primer is as follows:

[0044] raw material name

Number of copies

PVDC copolymer emulsion

100 servings

Tannin

2.5 servings

Phosphoric acid

2 servings

Isopropanol

10 servings

[0045] For emulsion polymerization, first do pre-polymerization. Add deionized water to the autoclave, add a part of the monomer mixture, non-ionic emulsifier and polymerization initiator to carry out seed polymerization, after which, remove the remaining monomer mixture, non-ionic emulsifier and polymerization initiator Add continuously at an equal rate.

[0046] Here, the emulsifier and the polymerization initiator are preferably added in the form of an aqueous solution.

[0047] The mixed monomers consist of 90 parts of vinylidene chloride (VDC), 3 parts of butyl acrylate (BA), 2 parts of acrylic acid, 4 parts of methyl acrylate, and 1 part of glycidyl methacrylate.

[0048] As the emulsif...

Embodiment 2

[0059] The formula of the water-based PVDC anti-rust primer is as follows:

[0060] raw material name

[0061] Example 1 was repeated for other preparation processes.

Embodiment 3

[0063] The formula of the water-based PVDC anti-rust primer is as follows:

[0064] raw material name

Number of copies

PVDC copolymer emulsion

100 servings

Tannin

4.5 servings

Phosphoric acid

1.5 servings

Isopropanol

8 servings

Modified epoxy silane coupling agent

2 servings

[0065] The preparation process of the PVDC copolymer emulsion was repeated in Example 1, in which the kettle material emulsifier was changed to 0.45 parts of sodium secondary alkyl sulfonate, and the non-ionic emulsifier was changed to 4.5 parts. The obtained latex is also suitable for water-based anti-rust primer.

[0066] The PVDC copolymer emulsion, modified epoxy silane coupling agent and H 3 PO 4 Add the mixture to the dispersion tank according to the proportion and stir evenly, then add the mixture composed of tannic acid and isopropanol to the dispersion tank, and disperse uniformly to obtain the product.

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PUM

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Abstract

This invention relates to a method for preparing aqueous PVDC emulsion antirust primer. The antirust primer comprises: OVDC copolymer emulsion 100 parts, tannic acid 0.5-5 parts, phosphoric acid 0.1-6 parts, and isopropanol 5-20 parts. The PVDC copolymer emulsion is prepared by emulsion-copolymerization of VDC and copolymerizable monomer in the presence of nonionic emulsifier and initiator. The antirust primer can dissolve the rust on the surface to be coated, and can clean the surface. The antirust primer does not precipitate on the coated surface, and can intimately adhere to the surface. The formed film has good obstacle effect on water and oxygen. The antirust primer can be used as protective antirust primer for metals.

Description

Technical field [0001] The invention relates to a water-based polyvinylidene chloride latex antirust primer and a preparation method thereof, in particular to an antirust primer used for the protection of rusty metals. Background technique [0002] Metal corrosion is a very serious problem that people face. A rough estimate is that the annual loss of metal structures, equipment, and materials due to corrosion is about 20-40% of the metal output, and the economic loss accounts for 1.5-3% of the total output value of the national economy. [0003] Metal corrosion is the result of a chemical or electrochemical reaction between the surface of the metal and the surrounding environment, which causes the metal to be destroyed and lose its original performance. Rust prevention has always been one of the major scientific research topics at home and abroad. People have studied a variety of measures to prevent and inhibit metal corrosion, and paint anti-rust is an effective method. For rust...

Claims

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Application Information

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IPC IPC(8): C09D127/08C09D5/12C09D7/12
Inventor 应忠芳何祥麟阮国富王婧季国华陈荣黄建柳继禹邓焕青
Owner ZHEJIANG SENLANDE PACKAGING TECH
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