Method for preparing bio-base high-efficiency delayed-coagulation water-reducing agent from natural chitin
A high-efficiency water-reducing agent and chitin technology, which is applied in the field of using natural chitin to prepare bio-based retarding high-efficiency water-reducing agent, can solve the problems of limited use, high cost of raw materials, pollution of surrounding environment, etc., so as to save the cost of materials , Reduce the cost of compounding, and expand the effect of the application field
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Embodiment 1
[0040] According to the method described in this patent technology, a batch (1 ton) of natural chitin bio-based retarding superplasticizer is produced for concrete application research.
[0041] Preparation of natural chitin bio-based retarding superplasticizer
[0042] 1. Preparation of oligomeric chitin
[0043] Weigh 160-170kg of natural chitin polymer (the weight average molecular weight is 411,900) and 830-840kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser, and proceed at a certain speed. After stirring, the chitin polymer is dispersed into the water to form a uniform suspension solution. Raise the temperature to 60°C, add dropwise a mixed solution of 15-17kg hydrogen peroxide (50% concentration) and 5-7kg acetic acid (99.8% concentration) under stirring, control the temperature not to exceed 60°C, and complete the addition within 30 minutes , React at a temperature of 65-70°C for 3 hours to obtain a s...
Embodiment 2
[0049] According to the method described in this patent technology, a batch (1.5 tons) of natural chitin bio-based retarding superplasticizer was produced for concrete application research.
[0050] Preparation of natural chitin bio-based retarding superplasticizer
[0051] 1. Preparation of oligomeric chitin
[0052] Weigh 240-255kg of natural chitin polymer (weight-average molecular weight: 411,900) and 1200-1300kg of water into a reaction vessel equipped with a stirrer, thermometer, dropping funnel, and reflux condenser, and stir at a certain speed , chitin polymer dispersed in water to form a uniform suspension solution. Raise the temperature to 60°C, add dropwise a mixed solution of 22-25.5kg hydrogen peroxide (50% concentration) and 7.5-10.5kg acetic acid (99.8% concentration) while stirring, control the temperature not to exceed 60°C, and add in 30 minutes Complete reaction at 65-70°C for 3.5 hours to obtain a semi-clear solution of oligomeric chitin. The molecular w...
Embodiment 3
[0058] According to the method described in this patent technology, a batch (2 tons) of natural chitin bio-based retarding superplasticizer was produced for concrete application research.
[0059] Preparation of natural chitin bio-based retarding superplasticizer
[0060] 1. Preparation of oligomeric chitin
[0061] Weigh 320-340kg of natural chitin polymer (the weight average molecular weight is 411,900) and 1660-1680kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser, and proceed at a certain speed. After stirring, the chitin polymer is dispersed into the water to form a uniform suspension solution. Raise the temperature to 60°C, add dropwise a mixed solution of 30-34kg hydrogen peroxide (50% concentration) and 10-14kg acetic acid (99.8% concentration) under stirring, control the temperature not to exceed 60°C, and complete the addition within 30 minutes , React at a temperature of 65-70°C for 3 hours to obta...
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