Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of chromium-free passivation solution based on nanocrystalline cellulose airgel and preparation method thereof

A technology of cellulose airgel and nano crystallization, which is applied in the coating process of metal materials, can solve the problems of poor mechanical properties and insufficient corrosion resistance of the film, and achieve the effect of improving mechanical strength and simple preparation method

Active Publication Date: 2019-01-22
HENAN INST OF ENG
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a passivation liquid film with poor mechanical properties after film formation using organic matter as the film-forming material and insufficient corrosion resistance effect of the passivation liquid film using inorganic matter as the film-forming material. Chromium-free passivation solution based on nanocrystalline cellulose airgel and preparation method thereof

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of chromium-free passivation solution based on nanocrystalline cellulose airgel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the chromium-free passivation solution based on nanocrystalline cellulose aerogel of the present embodiment is as follows:

[0028] (1) Take 3.0g of microcrystalline cellulose and 15g of sulfuric acid aqueous solution with a mass fraction of 20% and place them in a conical flask and mix them evenly. Under the condition of 30r / min, carry out a hydrolysis reaction at a temperature of 60°C for 2h, and use distilled water to hydrolyze the The resulting microcrystalline cellulose is washed to a pH equal to 7;

[0029] (2) drying the hydrolyzed microcrystalline cellulose obtained in step (1) to constant weight at 40° C. to obtain a total of 2.2 g of hydrolyzed microcrystalline cellulose powder, and then using 217.8 g of distilled water and the above-mentioned hydrolyzed microcrystalline cellulose After the powder is mixed, it is prepared into an aqueous solution of hydrolyzed microcrystalline cellulose with a mass fraction of 1.0%;

[0030] (3) The ...

Embodiment 2

[0036] The preparation method of the chromium-free passivation solution based on nanocrystalline cellulose aerogel of the present embodiment is as follows:

[0037] (1) Take 8.0g of microcrystalline cellulose and 40g of sulfuric acid aqueous solution with a mass fraction of 20% and place them in a conical flask and mix them evenly. Under the condition of 30r / min, carry out a hydrolysis reaction at a temperature of 60 ° C for 2h, and use distilled water to hydrolyze the The resulting microcrystalline cellulose is washed to a pH equal to 7;

[0038] (2) drying the hydrolyzed microcrystalline cellulose obtained in step (1) to constant weight at 40° C. to obtain a total of 5.7 g of hydrolyzed microcrystalline cellulose powder, and then using 564.3 g of distilled water and the above-mentioned hydrolyzed microcrystalline cellulose After the powder is mixed, it is prepared into an aqueous solution of hydrolyzed microcrystalline cellulose with a mass fraction of 1.0%;

[0039] (3) Th...

Embodiment 3

[0045] The preparation method of the chromium-free passivation solution based on nanocrystalline cellulose airgel of the present embodiment is as follows:

[0046] (1) Take 7.0g of microcrystalline cellulose and 35g of 20% sulfuric acid aqueous solution in a conical flask and mix them evenly. Under the condition of 30r / min, carry out a hydrolysis reaction with a temperature of 60°C for 2h, and use distilled water to hydrolyze After washing the microcrystalline cellulose to a pH value equal to 7;

[0047] (2) Dry the hydrolyzed microcrystalline cellulose obtained in step (1) to a constant weight at 40°C to obtain a total of 5.2 g of hydrolyzed microcrystalline cellulose powder, and then use 514.8 g of distilled water to mix with the above hydrolyzed microcrystalline cellulose The powders are mixed to prepare a hydrolyzed microcrystalline cellulose aqueous solution with a mass fraction of 1.0%;

[0048] (3) Divide into two groups and carry out high-pressure homogeneous treatmen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
crystallinityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a chromate-free passivation solution based on nano crystalline cellulose aerogel and a preparation method thereof. According to the chromate-free passivation solution, the nano crystalline cellulose aerogel is used as a base material, polyurethane resin is used as a film forming material, and the corrosion area of a galvanized steel sheet subjected to passivating treatment is smaller than 7.0% after the galvanized steel sheet is treated through a neutral salt spray test for 96h. The chromate-free passivation solution based on the nano crystalline cellulose aerogel and the preparation method thereof take the following steps of hydrolyzing microcrystalline cellulose, preparing a hydrolysis microcrystalline cellulose aqueous solution, preparing a nano crystalline cellulose aqueous solution, preparing the nano crystalline cellulose aerogel, preparing a polyurethane prepolymer and synthesizing the chromate-free passivation solution. The preparation method of the chromate-free passivation solution based on the nano crystalline cellulose aerogel is simpl e, environmentally friendly, suitable for meeting the sustainable development requirement, and capable of being combined with an existing technology easily to achieve industrial production.

Description

technical field [0001] The invention belongs to the technical field of passivation of galvanized steel sheets, and in particular relates to a chromium-free passivation solution using nanocrystalline cellulose aerogel as a base material and polyurethane resin as a film-forming substance and a preparation method thereof. Background technique [0002] Traditional chromate passivation has a significant protective effect on galvanized steel, but it will seriously pollute the environment and endanger people's health. Its use is strictly limited. The development of chromium-free passivation technology has become an inevitable trend of sustainable development. [Zhou Yusheng. Research Progress of Chromium-Free Passivation Technology, Iron and Steel, 2003, 4; Dong Peng, Zhang Yingjie. Corrosion Resistance of Silicate Passivation Films on Zinc Coatings, Material Protection, 2010, 10]. [0003] At present, the research on chromium-free passivation technology mainly focuses on the use of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/02
CPCC23C22/02
Inventor 张浩辛长征王娜朱明李沛瑶洪亮
Owner HENAN INST OF ENG