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

A kind of preparation method of oxidation-sulfonated starch water reducer

A technology of sulfonated starch and oxidized starch, applied in the field of concrete water reducing agent, can solve the problems of limited and unreachable starch utilization means, and achieve the effects of increasing strength, reducing water consumption, and improving compressive and flexural strength

Inactive Publication Date: 2018-11-23
MIANYANG MOSHI TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods for the utilization of starch are limited, and the expected goal cannot be achieved.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 20% starch milk with starch and water, put it into a three-neck flask, heat it in a water bath at 30°C, adjust the pH value of the starch milk to 9 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 3 hours. Stop the reaction, filter, wash and dry to obtain oxidized starch; prepare 15% starch milk from oxidized starch and formamide, make it into a three-necked flask, control the temperature at 0°C, and then slowly add 5% of 1: 1 mixture of chlorosulfonic acid and formamide, after reacting for 1 hour, terminate the reaction, filter, wash and dry to obtain the product oxidized-sulfonated starch.

[0017] When the product is used as a water reducer in cement, when the dosage is 0.6%, the fluidity of the cement slurry reaches 260mm, and the cement slurry coagulates for 16 hours. The compressive strength ratios of cement-mortar-sand for 3d, 7d, and 28d are 111, 111, and 105, respectively. The determination method of cement paste fluidity is ...

Embodiment 2

[0019] Mix 30% starch milk with starch and water, put it into a three-necked flask, heat it in a water bath at 35°C, adjust the pH value of the starch milk to 11 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 3.5 hours , stop the reaction, filter, wash and dry to obtain oxidized starch; make 20% starch milk from oxidized starch and formamide, make it into a three-necked flask, control the temperature to normal temperature, and then slowly add 5% of 1: 1 mixture of chlorosulfonic acid and formamide, after reacting for 1 hour, terminate the reaction, filter, wash and dry to obtain the product oxidized-sulfonated starch.

[0020] When the product is used as a water reducer in cement, when the dosage is 0.5%, the fluidity of the cement slurry reaches 280mm, and the cement slurry coagulates for 20 hours. The compressive strength ratios of cement-mortar sand for 3d, 7d, and 28d are 110, 109, and 108, respectively.

Embodiment 3

[0022] Mix 30% starch milk with starch and water, put it into a three-necked flask, heat it in a water bath at 40°C, adjust the pH value of the starch milk to 10 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 4 hours. Stop the reaction, filter, wash and dry to obtain oxidized starch; make 25% starch milk from oxidized starch and formamide, make it into a three-necked flask, control the temperature to normal temperature, and then slowly add 5% of 1:1 The mixture of chlorosulfonic acid and formamide was reacted for 2 hours, the reaction was terminated, and the product oxidized-sulfonated starch was obtained after filtering, washing and drying.

[0023] When the product is used as a water reducer in cement, when the dosage is 0.7%, the fluidity of the cement paste can reach 300mm, and the cement paste can set for 24 hours. The compressive strength ratios of cement-mortar-sand for 3d, 7d, and 28d are 120, 118, and 110, respectively.

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

No PUM Login to View More

Abstract

The invention discloses an oxidation-sulfonation starch water reducing agent preparation method, which comprises: adding water to a reaction kettle, adding 20-40% of corn starch while stirring, adjusting the pH value of the starch milk to 9-11 with an alkaline substance, adding an oxidizing agent while stirring, continuously carrying out the stirring reaction for 3-5 h at a temperature of 30-45 DEG C, adjusting with an acid to achieve a neutral state, filtering, and drying to obtain oxidation starch; and adding an organic solvent to a reaction kettle, adding 10-15% of the oxidation starch while stirring, controlling the temperature at 0-60 DEG C, slowly adding an acidic substance and organic solvent mixture in a dropwise manner, stirring for 1-2 h, terminating the reaction, filtering, and drying so as to obtain the oxidation-sulfonation starch. According to the present invention, the process of the preparation method is simple; after the product is added to cement, the cement slurry has good fluidity and good retardability; after the product is added to mortar, the advantages of fluidity increasing, water consumption reducing, compressive strength increasing and bending strength increasing can be provided; and after the product is added to concrete, the slump of the concrete can be increased, and the strength is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, and in particular relates to a preparation method of an oxidized-sulfonated starch water reducer. Background technique [0002] Under the condition of maintaining the same workability of fresh concrete, the admixture that can significantly reduce the water consumption is called concrete water reducer, also known as dispersant or plasticizer, which is the most commonly used concrete admixture. According to my country's concrete admixture standard (GB8076-1997), the water reducing agent with a water reducing rate equal to or greater than 5% is called an ordinary water reducing agent or plasticizer; the water reducing agent with a water reducing rate equal to or greater than 10% It is called a superplasticizer or a superplasticizer. According to the effect of the water reducing agent on the setting time and strength growth of concrete and whether it has the function of entraining air...

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): C04B24/16C04B103/30
Inventor 赵平蒋旺林
Owner MIANYANG MOSHI TECH CO LTD