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Special salt-free oxidation resisting zinc cyanamide anticorrosion pigment for environmental-protection mirror back coating and production method thereof

A technology of anti-corrosion pigments and zinc cyanamide, which is applied in the direction of anti-corrosion coatings, cyanamide, fibrous fillers, etc., can solve the problems of low product activity, high water-soluble salt, complex process, etc., and achieve low water-soluble free salt and impurity content, Good dispersibility and the effect of reducing environmental pollution

Inactive Publication Date: 2011-01-12
ZHEJIANG TIANNU GROUP PAINT MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application in mirror back coatings is limited due to the presence of large amounts of carbonic acid and sulfuric acid
[0007] The above various approaches for producing zinc cyanamide have the following disadvantages, which require excessive cyanamide compounds, nitrogen or vacuum, and high temperature conditions to obtain; or produce by hydrocyanamide salt precipitation; or produce cyanamide The intermediate product of amine hydrogen is prepared with zinc oxide, the product has low activity, many by-products, high water-soluble salt, high energy consumption and complex process

Method used

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  • Special salt-free oxidation resisting zinc cyanamide anticorrosion pigment for environmental-protection mirror back coating and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a specific reaction device equipped with a stirrer and a condenser, put 15g-25g of ZnO-T1 zinc oxide into 55g-65g of deionized water to completely disperse to prepare a uniform zinc oxide slurry, and slowly add 18g-23g of cyanamide , under stirring and dispersing, the exothermic reaction begins. When the temperature begins to drop, high-speed stirring is carried out to make it completely react. It is found through instrument observation that the tiny particles begin to decrease until there are no particles, add 1.5g-2.5gKH-550 even The joint agent is stirred evenly, and the water is separated at rest. The separated water is recycled for the next preparation of zinc oxide slurry, and the separated zinc cyanamide precipitate is filtered with a plate and frame filter press to remove water, and then placed in a stainless steel constant temperature oven. Dry at 105°C until the water content is less than 0.1%, move to a stainless steel powder machine for crushing, and the f...

Embodiment 2

[0022] In a specific reaction device equipped with a stirrer and a condenser, put 15g-20g ZnO-X1 zinc oxide into 50g-65g deionized water and disperse completely to prepare a uniform zinc oxide slurry, slowly add 15g-20g dicyandiamide , under stirring and dispersing, the exothermic reaction begins. When the temperature begins to drop, high-speed stirring is carried out to make it react completely. It is found through instrument observation that the tiny particles begin to decrease until there are no particles, add 1.5g-2.0gKH-550 even The joint agent is stirred evenly, and the water is separated at rest. The separated water is recycled for the next preparation of zinc oxide slurry, and the separated zinc cyanamide precipitate is filtered with a plate and frame filter press to remove water, and then placed in a stainless steel constant temperature oven. Dry at 105°C until the water content is less than 0.1%, move to a stainless steel powder machine for crushing, and the fineness ...

Embodiment 3

[0024] In a specific reaction device equipped with a stirrer and a condenser, put 15g-25g of ZnO-X1 zinc oxide into 55g-60g of deionized water to completely disperse to prepare a uniform zinc oxide slurry, and slowly add 18g-20g of dicyandiamide , under stirring and dispersing, the exothermic reaction begins. When the temperature begins to drop, high-speed stirring is carried out to make it react completely. It is found through instrument observation that the tiny particles begin to decrease until there are no particles, add 0.5g-1.5gTYZOR AA-75 The coupling agent is stirred evenly, and the water is separated at rest. The separated water is recycled for the next preparation of zinc oxide slurry, and the separated zinc cyanamide precipitate is filtered with a plate and frame filter press to remove water, and then placed in a stainless steel constant temperature Dried in an oven at 105°C until the water content is less than 0.1%, moved to a stainless steel powder machine for crus...

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Abstract

The invention relates to a special salt-free oxidation resisting zinc cyanamide anticorrosion pigment for an environmental-protection mirror back coating. The pigment is a product obtained by the reaction of zinc oxide and a cyanamide compound through adding a coupling agent. The invention also relates to a production method of the special salt-free oxidation resisting zinc cyanamide anticorrosion pigment for the environmental-protection mirror back coating, comprising the following steps of: putting the high-activity zinc oxide into deionized water to be completely dispersed to prepare even zinc oxide slurry; slowly adding the cyanamide compound; starting the exothermal reaction under the stirring dispersion; carrying out high-speed stirring when the temperature starts to fall to make the zinc oxide and the cyanamide compound completely react; observing through an instrument to discover that micro particles start to decrease until the particles disappear. The invention has the advantages that the zinc cyanamide anticorrosion pigment does not contain lead, has low oil absorption value and low content of water-soluble free salt and impurities, saves the energy sources, reduces the environment pollution and the manufacturing cost, reaches the international advanced level in performance and has good economic benefit.

Description

technical field [0001] The invention relates to an anti-corrosion pigment in the chemical industry and a production method thereof, in particular to a special salt-free, oxidation-resistant cyanamide zinc anti-corrosion pigment and a production method for environmental protection mirror back coatings. Background technique [0002] The silver layer or aluminum layer on the mirror is protected by the mirror back coating, but it is still very easy to corrode and decompose when there is moisture, air pollutants, salt, hydrogen sulfide, ammonia and chloride in the environment. Especially in steel structure heavy-duty anti-corrosion primers, zinc phosphate, aluminum tripolyphosphate, etc. are often used as anti-corrosion pigments, but the effect is contrary to expectations, and it does not play a good anti-corrosion effect in the mirror back coating. There is actually a corrosive effect on the silver or aluminum layer. [0003] The paint used for mirror back coating is mainly a o...

Claims

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Application Information

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IPC IPC(8): C09C1/04C09D5/08
CPCC01C3/16
Inventor 姚珄铭
Owner ZHEJIANG TIANNU GROUP PAINT MFG