Preparation method of modified natural chitin bio-based high-performance polycarboxylate water reducer
The technology of chitin and polycarboxylic acid is applied in the field of preparation of modified natural chitin bio-based high-performance polycarboxylate water reducing agent, which can solve the problems of single function, environmental pollution and high price.
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Embodiment 1
[0041] 1. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer
[0042] 1.1. Preparation of amino chitin polymer
[0043] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 300kg of chitin polymer and 700kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 138°C, add 1170kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation, stir at 138°C for 1.5 hours, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.
[0044] 1.2. Degradation of chitin polymer
[0045] Lower the tempe...
Embodiment 2
[0051] 2. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer
[0052] 2.1. Preparation of aminochitin polymer
[0053] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 330kg of chitin polymer and 670kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 138°C, add 1185kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation treatment, stir at 135°C for 2 hours, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.
[0054] 2.2. Degradation of chitin polymer
[0055] Lower th...
Embodiment 3
[0061] 3. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer
[0062] 3.1. Preparation of aminochitin polymer
[0063] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 350kg of chitin polymer and 660kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 1140°C, add 1200kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation treatment, stir at 140°C for 1 hour, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.
[0064] 3.2. Degradation of chitin polymer
[0065]Lower the...
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