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A kind of alkali-soluble acrylate polymer composition and preparation method thereof
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A technology of acrylate and linear polymers, which is applied in the field of polymer synthesis and can solve problems such as high turbidity, limited thickening ability, and large dosage
Active Publication Date: 2017-03-08
GUANGZHOU TINCI MATERIALS TECH
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Problems solved by technology
However, this polymer has the problems of large dosage, limited thickening ability and high turbidity in the formula. Therefore, it is very marketable to develop a polymer emulsion with a small dosage in the formula, significant thickening ability and improve the turbidity of the formula at the same time. prospect
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specific Embodiment 1
[0065] Add 166 g of acrylic acid and 324 g of methyl methacrylate into a 2 L four-neck flask equipped with a nitrogen device, a magnetic stirring device and a peristaltic pump to form a monomer phase.
[0066] Prepare 68 g of ammonium persulfate solution containing 1.12 g of ammonium persulfate, labeled as initiator.
[0067] Add 894g of deionized water, 13g of sodium lauryl sulfate, and 10g of methyl methacrylate into a 2L five-neck flask equipped with a nitrogen device, a condenser, a stirrer, a thermometer and a peristaltic pump, and add 10g of methyl methacrylate after stirring for 10 minutes. Based on acrylic acid, start stirring and ventilate nitrogen, raise the temperature of the system to 86°C, start to add the initiator (0.28mL / min) dropwise for 20min, and form a water phase.
[0068] Continue dripping the initiator at a speed of 0.28mL / min, and start to drop the monomer phase to the five-necked flask, the rate of addition is 2.29mL / min, stop dripping after the monome...
specific Embodiment 2
[0071] Add 166g of acrylic acid and 324g of ethyl methacrylate into a 2L four-necked flask equipped with a nitrogen device, a magnetic stirring device and a peristaltic pump to form a monomer phase.
[0072] Prepare 68 g of ammonium persulfate solution containing 1.12 g of ammonium persulfate, labeled as initiator.
[0073] Add 894g of deionized water, 13g of sodium lauryl sulfate, and 10g of methyl methacrylate into a 2L five-neck flask equipped with a nitrogen device, a condenser, a stirrer, a thermometer and a peristaltic pump, and add 10g of methyl methacrylate after stirring for 10 minutes. Based on acrylic acid, start stirring and blow nitrogen, raise the temperature of the system to 82°C, start to add the initiator (0.28mL / min) dropwise for 20min, and form the water phase.
[0074] Continue to drop the initiator at a rate of 0.28mL / min, and start to drop the monomer phase into the five-necked flask, the dropping rate is 2.29mL / min, the temperature is controlled at 82±1°...
specific Embodiment 3
[0077] It is substantially the same as Example 1, except that the crosslinking agent in the reaction process is 1 g of diallyl itaconate, and the initiator is 1.2 g of potassium persulfate.
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Abstract
The invention discloses an alkaline-soluble acrylate polymer composition, which is prepared from the raw material formula by emulsion polymerization. The alkaline-soluble acrylate polymer composition comprises the following components in percentage by weight: 8wt%-15wt% of an unsaturated carboxylic acid monomer as a monomer phase, 19wt%-28wt% of at least one C1-C10 alkyl ester of acrylic acid or methacrylic acid, 60wt%-70wt% of deionized water as a water phase, 1wt%-3wt% of a prepolymerized linear polymer, 0wt%-3wt% of protective colloid, 0.05wt%-1.0wt% of an emulsifier, 0.05wt%-0.2wt% of a cross-linking agent and 0.05wt%-0.5wt% of an initiator, wherein the number-average molecular weight is 10,000-100,000; and the cross-linking agent is added to a reaction system after 28%-58% of monomer phase is consumed. The invention aims at providing the alkaline-soluble acrylate polymer composition which is small in amount in the formula, good in suspending power in a low pH condition, high in thickening capacity, and good in transparency; and meanwhile, a preparation method of the alkaline-soluble acrylate polymer composition is also provided.
Description
technical field [0001] The invention belongs to the field of polymer synthesis, in particular to an alkali-soluble acrylate polymer with excellent thickening and suspension properties, high transparency, good thickening and suspension properties and good rheological properties even in a low pH range Compositions and methods for their preparation. Background technique [0002] One class of liquid thickeners commonly used to thicken surface active aqueous systems are alkali-soluble / alkali-swellable emulsion polymers (ASE). It is insoluble in water until it is neutralized with alkali, and can only play its role as a rheology modifier if its pH value is adjusted above 6.5. Its rheological thickening mechanism is as follows: with the increase of pH value and the neutralization of carboxyl groups, the polymer molecules are hydrated, and the molecular chains expand under the action of the electrostatic repulsion of the anionic charge center of the carboxyl groups. Molecular chain...
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