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Starch-based graft copolymer coal water slurry dispersant and preparation method thereof

A technology of graft copolymer and coal water slurry, which is applied in the field of starch-based graft copolymer coal water slurry dispersant and its preparation, can solve the problems of high water separation rate, poor stability of coal water slurry, toxicity, etc., and achieve dispersion Good performance, improved storage stability and long stable period

Inactive Publication Date: 2012-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of the CWS prepared by this kind of dispersant is poor, and the prepared CWS generally produces irreversible precipitation after being placed for more than 2 days, the water separation rate is high, and it has certain toxicity.

Method used

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  • Starch-based graft copolymer coal water slurry dispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Water and starch are added into the reactor to make a starch aqueous suspension with a mass fraction of 12%. The starch is saponin starch, and the starch aqueous suspension is heated to 34° C. after stirring, and then 1.8% of the starch mass is added to oxidize it. 26min, the oxidant is potassium sulfate, after the oxidation is completed, the temperature is raised and gelatinized at 84°C for 30min, and the temperature is lowered to 50°C after the heat-insulated gelatinization, and the mixed monomer and initiator are added dropwise after cooling to obtain a reaction system. Starch and mixed monomer The mass ratio of the monomer is 1: 1.2, and the addition amount of the initiator is 4% of the total mass of the starch and the mixed monomer. The reaction system is heated up and reacted at 84°C for 50min, then cooled to 26°C and used with a mass fraction of 7% The sodium hydroxide aqueous solution adjusts the pH to be 8, the mixed monomer is sodium methacrylate, and the initi...

Embodiment 2

[0019] Water and starch are added into the reactor to make a starch aqueous suspension with a mass fraction of 15%, the starch is potato starch, the starch aqueous suspension is heated up to 42°C under stirring, and then an oxidant with 3% of the starch mass is added to oxidize for 42min , the oxidizing agent is sodium persulfate. After oxidation, heat up and gelatinize at 90°C for 45 minutes, then cool down to 62°C after heat-insulating gelatinization. The mass ratio of the monomer is 1: 1.1, and the addition amount of the initiator is 3% of the total mass of the starch and the mixed monomer. The reaction system is heated up and reacted at 90°C for 95min, then cooled to 35°C and used with a mass fraction of 6%. Sodium hydroxide aqueous solution adjusts pH to be 8, and described mixed monomer is the mixture of styrene and acrylic acid, and the mass ratio of styrene and acrylic acid is 1: 5, and described initiator is sodium persulfate, potassium persulfate, ammonium persulfate ...

Embodiment 3

[0021] Water and starch are added into the reactor to make a starch aqueous suspension with a mass fraction of 20%. The starch is tapioca starch, and the starch aqueous suspension is heated up to 50°C under stirring, and then an oxidant with 5% of the starch mass is added to oxidize for 60min. , the oxidizing agent is potassium persulfate. After oxidation, heat up and gelatinize at 95°C for 60 minutes, then cool down to 70°C after heat-insulating gelatinization, and then drop the mixed monomer and initiator at the same time to obtain a reaction system. The mass ratio of the monomer is 1: 1.5, and the addition amount of the initiator is 5% of the total mass of the starch and the mixed monomer. The reaction system is heated up and reacted at 95°C for 120min, then cooled to 40°C and used with a mass fraction of 10% Sodium hydroxide aqueous solution adjusts pH to be 9, and described mixed monomer is acrylic acid, and described initiator is potassium persulfate, and described initia...

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Abstract

The invention provides a starch-based graft copolymer coal water slurry dispersant and a preparation method thereof. The method comprises steps that: a 10% to 20% starch aqueous suspension is heated; an oxidizing agent which takes 0.1% to 5% of the mass of starch is added to the aqueous suspension of starch for carrying out an oxidization reaction for 10 to 60min; the mixture is heated to a temperature of 80 to 95 DEG C, and the mixture is gelatinized for 20 to 60min while maintaining the temperature; the temperature of the mixture is reduced to 40 to 70 DEG C, and meanwhile mixed monomer and an initiator are dropped into the mixture; the mixture is heated to a temperature of 80 to 95 DEG C, and is subject to a reaction while maintaining the temperature for 20 to 120min; the temperature is reduced to 20 to 40 DEG C, and the pH value of the mixture is regulated to 7-9 by using a sodium hydroxide solution. The dispersant is a viscous emulsion with a color of light yellow to off-white, a solid content of 25 to 35%, a pH value of 7 to 9, and a viscosity of 30 to 150mPa.s. According to the invention, strong dispersibility of styrene and carboxylic salt is fully utilized. Hydrogen bonding effect of polyhydroxy on starch straight chains upon hydrones is adopted, such that the storage stability of the coal water slurry is improved, the dispersibility of the coal water slurry is good, and the stationary phase of the coal water slurry is long-lasting.

Description

technical field [0001] The invention belongs to the field of coal water slurry, in particular to a starch-based graft copolymer coal water slurry dispersant and a preparation method thereof. Background technique [0002] Naphthalene sulfonate polycondensate dispersant has good dispersibility to coal particles and good matching with coal types, so it is a widely used dispersant in coal water slurry industry. However, the stability of the CWS prepared by this kind of dispersant is relatively poor, and the prepared CWS generally produces irreversible precipitation after being left for more than 2 days, has a high water separation rate, and has certain toxicity. People explore the use of natural product-based coal-water slurry dispersants to solve the problems of environmental protection and low cost. [0003] At present, the most widely used natural modified polymer coal water slurry dispersant is lignin modified product, which is widely used because it mainly uses papermaking...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F212/08C08F228/02C08F220/44C08F220/46C08F220/56C08F220/48C10L1/196C10L1/195C10L1/32
Inventor 张光华朱军峰郝皓王西峰房瑜红
Owner SHAANXI UNIV OF SCI & TECH
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