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Method for preparing nano composite polyurea coating

A nanocomposite and coating technology, applied in polyurea/polyurethane coatings, coatings, devices for coating liquid on the surface, etc., can solve the problem that the final quality of polyurea coatings is greatly affected, and achieve good controllability and operability, reducing photosensitivity, and reducing the effect of microscopic cracks

Inactive Publication Date: 2010-11-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurea coatings have many advantages, but the preparation process of polyurea coatings has a great influence on the final quality of polyurea coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Pretreatment of the substrate: The substrate of the sample is A3 steel, which is sandblasted with No. 40 corundum sand, and the surface roughness reaches Sa2.5 level. It is used immediately after sandblasting.

[0021] Preparation of component A: Add 600g143L into a three-necked flask, blow nitrogen, heat to 90°C and keep stirring, keep warm for 1 hour; cool to 60°C, add 400g polyether triol dropwise, and then heat to 60°C , keep the reaction for 1h, fill the obtained reactant with nitrogen and seal it up at room temperature for future use.

[0022] Addition of nano-powder: put 57.42g of amino-terminated polyether D-400 into the container, and disperse at a speed of 800r / min for 30 minutes with a disperser; at the same time, add 9.46g of nano-silica powder to the high-speed dispersion Amino-terminated polyether D-400, then disperse at a speed of 1600r / min for 30min, heat the mixture of high-speed dispersed nano-silica powder and amino-terminated polyether D-400 to 90°C,...

Embodiment 2

[0026] The substrate was treated and the A component was prepared in the same manner as described in Example 1.

[0027] Addition of nano-powder: put 127.21g of amino-terminated polyether D-400 and 226.15g of amino-terminated polyether D-2000 into the container, and disperse with a disperser at a speed of 1000r / min; at the same time, 28.68g of nano-titanium dioxide powder The body is added to the above-mentioned mixture which is dispersed at a high speed. Then disperse at a speed of 1800r / min for 60 minutes, heat the mixture of high-speed dispersed nano-titanium dioxide powder, amino-terminated polyether D-400, and amino-terminated polyether D-2000 to 100°C, and disperse it in a 900W ultrasonic wave for 60 minutes. minute.

[0028] Preparation of component B mixed with nano-powder: mix the mixture of amino-terminated polyether D-400 and amino-terminated polyether D2000 added with nano-titanium dioxide powder with 441.69g of 4,4-methylenebis[N-sec-butylaniline] and 88.34 g of...

Embodiment 3

[0031] The substrate was treated and the A component was prepared in the same manner as described in Example 1.

[0032] Addition of nano-powder: put 127.21g of amino-terminated polyether D-400 and 226.15g of amino-terminated polyether D-2000 into a container, and disperse at a speed of 1200r / min with a disperser; at the same time, 28.68g of nano-trioxide Diantimony powder is added to the above mixture. After all the nano-powders are added, disperse at a speed of 1800r / min for 60 minutes. Heat the mixture of high-speed dispersed nano antimony trioxide powder, amino-terminated polyether D-400, and amino-terminated polyether D-2000 to 110°C, and disperse in 1500W ultrasonic wave for 90 minutes.

[0033] Preparation of component B mixed with nano-powder: Mix the mixture of amino-terminated polyether D-400 and amino-terminated polyether D2000 added with nano-antimony trioxide powder with 441.69g Aniline] and 88.34g of T-5000 were blended and compounded, and dispersed at a speed ...

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Abstract

The invention relates to a method for preparing a nano composite polyurea coating. The method comprises the following steps of: firstly, preparing a coating component A; secondly, preparing a component B mixed with nano powder; thirdly, adding the component A and the component B mixed with the nano powder into a connected spraying device respectively and heating the mixed materials to 65 to 75 DEG C; and when the nano composite polyurea coating is sprayed, controlling the pressures of the pressure meters of the component A and the component B mixed with the nano powder to be between 1,200 and 1,500 pounds per square inch and controlling the pressure difference of the two to be less than 200 pounds per square inch to perform spraying so as to obtain the nano composite polyurea coating. The method for preparing the nano composite polyurea coating has the advantage that: the technical scheme is adopted, so the nano composite polyurea coating prepared by the method has reduced photosensitivity and micro-flaws, improved wear resistance and corrosion resistance and high controllability and high operability.

Description

technical field [0001] The invention relates to a method for preparing industrial coatings, in particular to a method for preparing nanocomposite coatings. More specifically, the invention relates to a method for preparing a nano-powder composite aromatic polyurea coating. Background technique [0002] Polyurea coatings have been widely used in the fields of concrete protection and steel structure corrosion protection with 100% solid content and excellent physical and chemical properties such as wear resistance and corrosion resistance. However, aromatic polyurea is sensitive to ultraviolet light, and the discoloration of aromatic polyurea exposed to the natural environment is relatively serious (Huang Weiwei. Spraying polyurea elastomer technology [M]. Beijing: Chemical Industry Press. 2005.P49), severely limited its application. Through nano-powder compounding of aromatic polyurea, using the special physical and chemical properties of nano-powder (Sun Jinyi, Lin Xiping. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D7/12B05D1/34
Inventor 孟惠民李全德汪相辰俞宏英孙冬柏
Owner UNIV OF SCI & TECH BEIJING
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