Preparation method for chrome shaving and polyacrylamide composite gel
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A polyacrylamide and composite gel technology, applied in the field of materials, can solve the problems of secondary environmental pollution, insignificant economic benefits, insufficient strength of polyacrylamide gels, etc. Effect
Inactive Publication Date: 2012-05-09
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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In order to solve the problem of chrome leather shavings, some researchers use the protein prepared from waste leather shavings for feed, fertilizer, gelatin, regenerated leather chemical materials, etc., but the economic benefits of these treatment methods are not obvious, and they will also cause secondary environmental pollution. It can be seen that the scientific and effective use of
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[0024] A preparation method of chrome leather shavings and polyacrylamide composite gel, the steps are as follows:
[0025] (1) Polyacrylamide is prepared into a certain mass concentration solution with water;
[0026] (2) Lotropine, sodium sulfite, chromium acetate are dissolved in water to prepare chromium crosslinking agent;
[0027] (3) Add the chromium crosslinking agent to the polyacrylamide solution and stir evenly;
[0028] (4) chrome leather shavings are mechanically beaten and sieved, and added to the above solution under mechanical stirring;
[0030] (6) Place the above solution in a water bath at 45°C to 85°C and wait for it to coagulate.
Embodiment 1
[0032] A preparation method of chrome leather shavings and polyacrylamide composite gel, the steps are as follows:
[0033] (1) configuration 970g mass concentration is the polyacrylamide solution of 0.2%;
[0034] (2) Take by weighing 0.2g chromium acetate, 3.50g urotropine, 0.3g sodium sulfite, 7.0g water, stir and prepare chromium crosslinking agent;
[0035] (3) The chromium crosslinking agent is slowly added to 970 g of a polyacrylamide solution with a mass concentration of 0.2% under stirring conditions, and mixed evenly;
[0037] (5) Add 9.0 g of water-soluble phenolic resin solution, adjust pH=7-8 with sodium hydroxide;
[0038] (6) The glue solution was placed in a water bath at 85° C. and heated at a constant temperature for 15 hours. The solution was cross-linked to form a composite gel of chrome leather shavings and po...
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Abstract
The present invention relates to a preparation method for a chrome shaving and polyacrylamide composite gel. The method comprises the following steps: (1) preparing polyacrylamide into a solution by water; (2) dissolving methenamine, sodium sulfite and chromic acetate in water to prepare a chrome cross-linking agent; (3) adding the chrome cross-linking agent to the polyacrylamide solution from the step (1), and uniformly stirring; (4) adding chrome shavings to the solution from the step (3), then adding a water-soluble phenolic resin, adjust the pH value to 6-9; placing the resulting solutionin a water bath with the temperature of 45-85 DEG C to carry out heating and waiting-on cementing to obtain the chrome shaving and polyacrylamide composite gel. According to the present invention, the chrome shavings are adopted as the cross-linking agent to prepare the gel, such that the problem of the chrome shaving pollutant treatment can be solved well, and the waste chrome shavings are subjected to resource utilization so as to turn waste into treasure.
Description
technical field [0001] The invention belongs to the field of materials, in particular to a method for preparing a composite gel of chrome leather shavings and polyacrylamide. Background technique [0002] With the improvement of people's living standards, the issue of environmental protection has become more and more important to the country, and all industrial production must be committed to environmental protection. The tanning industry has always been considered as one of the industries with serious pollution. Only about 25% of the raw hides in the tanning process are turned into leather, and the rest are discarded as flakes, peeling, grinding, and trimming scraps. On the basis of layered leather, the ratio of raw hide to finished leather is only 30% to 50%. Nowadays, the development momentum of the leather industry is still good. The increase in leather demand has led to a large amount of chrome leather shavings. How to deal with chrome shavings has become one of the fa...
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