62 results about "Methoxy polyethylene glycol methacrylate" patented technology

The invention discloses a synthetic method for maleic polycarboxylic water reducer. The method is characterized in that: maleic anhydride (MA) and polyethylene glycol (PEG) / methoxy polyethylene glycol (MPEG) are used as the raw materials to synthesize polyethylene glycol maleate monoester (PEG-MA) / methoxy polyethylene glycol maleate monoester (MPEG-MA); and PEG-MA / MPEG-MA, AA / AANa and methoxy polyethylene glycol metacrylic acid ester (MPEG-MAA) are used as the raw materials to synthesize a maleic polycarboxylic water reducer containing carboxyl and a polyoxyethylene (PEO) side chain structure. According to the invention, the molecular structure of the polycarboxylic water reducer introduces carboxyl and PEO with a long side chain, which enables electrostatic repulsion among cement particles to be increased, dispersibility, i.e. retentivity of dispersion of cement to be improved, and steric hindrance among cement particles is realized, thereby realizing low slump loss. Simultaneously, the preparation method provided in the invention has the advantages of a simple process, mild reaction and wide sources of cheap raw materials.

The invention provides a polar dispersion composition containing 0.5 to 30 parts by mass of an electroconductive carbon black and 0.1 to 30 parts by mass of a styrene-methoxy polyethylene glycol methacrylate copolymer, with respect to 100 parts by mass of the polar dispersion composition. The composition of the invention is easy to handle as a liquid preparation, and develops sufficient electroconductivity when processed into a conductive material.

The invention discloses a low-sensitivity anti-mud ether-ester copolymerized polycarboxylic acid water reducing agent and a preparation method thereof. The pH value is 6.0-6.5, and the solid content is 45-55%. The pH value is 6.0-7.0, and the solid content is 45-55%. The water reducing agent is composed of the following components in parts by weight: 10-100 parts of 4-hydroxybutylvinyl polyoxyvinyl ether with the molecular weight of 2000-5000, 10-100 parts of methoxypolyethylene glycol methacrylate, 6-10 parts of unsaturated monocarboxylic acid, 3-6 parts of unsaturated carboxylate monomer, 2-5 parts of dibutyl itaconate, 1-5 parts of unsaturated amphoteric quaternary alkylphosphonium salt, 0.2-0.8 part of oxidizer, 0.2-1.0 part of first reducer, 0.02-0.06 part of second reducer, 0.2-0.6 part of chain-transfer agent, a right amount of potassium hydroxide water solution, a right amount of sodium hydroxide water solution and a right amount of deionized water. The polycarboxylic acid water reducing agent has the advantages of more uniform side chain distribution and favorable slump retaining effect, and has excellent low sensitivity to the doping amount changes.

The invention discloses a polyfunctional-group-modified polysiloxane emulsifier which is prepared by carrying out silicon hydrogenation reaction on low-hydrogen-content silicon oil, terminated polyether or polyether, methoxypolyethylene glycol acrylate or methoxypolyethylene glycol methacrylate, and long-chain alpha-olefin used as raw materials. The structure of the polyfunctional-group-modified polysiloxane emulsifier is disclosed in the specification, wherein R1 is a polyether chain segment, R2 is an alkane chain segment, and R3 is a methoxypolyethylene glycol acrylate or methoxypolyethylene glycol methacrylate chain segment. By adopting proper reaction monomers, the reaction activities of the monomers are approximate to the same to avoid the crosslinking reaction among the monomers, and thus, the method has the advantages of more thorough reaction, fewer monomer residues, fewer side reactions, favorable production reproducibility and more stable product quality. By optimizing the screening, proper functional groups are adopted to modify the polysiloxane, so that the adaptability of the product is enhanced. When being used as a W / O emulsifier, the polyfunctional-group-modified polysiloxane emulsifier can obtain soft and smooth skin sensation and have high emulsifying stability.

The invention discloses a polymer dispersant for a liquid disperse dye as well as a synthesis method and application of the polymeric dispersant. The synthesis method comprises the following steps: weighing three monomers, namely octadecyl methacrylate, acrylic acid and methoxy polyethylene glycol methacrylate, dissolving the monomers in isopropanol, uniformly conducting mixing, adding a formed mixture into a reactor, conducting stirring, and introducing nitrogen into a reaction flask to remove oxygen in the reactor; dissolving an initiator in acetone, when the temperature rises to 50-70 DEG C, dropwise adding the initiator solution through a micro-injection pump, and controlling the dropwise adding time to be 0.5-1.5 h; after dropwise adding the initiator, keeping the temperature at 75-85 DEG C and conducting reacting for 6-8 hours; adjusting the pH value of the system to 7.5-8.5, and conducting discharging; and performing post-treatment to obtain the polymer dispersant. The dispersant with the structure is relatively high in grinding efficiency when being used for preparing a liquid disperse dye, and the storage stability of the dye is relatively good.

The invention discloses a solid superacid catalyzed esterification synthesis method of methoxy polyethylene glycol methacrylic acid ester. Methoxy polyethylene glycol and methacrylic acid are treated with a esterification reaction under conditions of solid superacid catalyst SO4<2-> / ZrO2, polymerization inhibitor and water carrying agent. After the reaction, the solid superacid is removed by filtering separation; a filtrate is treated with reduced pressure distillation to recover the water carrying agent. Obtained high purity methoxy polyethylene glycol mono methacrylic acid ester is a macromonomer methoxy polyethylene glycol mono methacrylic acid ester for synthesizing polycarboxylic water carrying agent. The recovered water carrying agent and solid superacid SO4<2-> / ZrO2 can be reused. A conversion based on methoxy polyethylene glycol reaches higher than 98.2%, and an ester yield is higher than 98%.

The invention discloses a low-sensitivity anti-mud ether-ester copolymerized polycarboxylic acid water reducing agent and a preparation method thereof. The pH value is 6.0-6.5, and the solid content is 45-55%. The pH value is 6.0-7.0, and the solid content is 45-55%. The water reducing agent is composed of the following components in parts by weight: 10-100 parts of 4-hydroxybutylvinyl polyoxyvinyl ether with the molecular weight of 2000-5000, 10-100 parts of methoxypolyethylene glycol methacrylate, 6-10 parts of unsaturated monocarboxylic acid, 3-6 parts of unsaturated carboxylate monomer, 2-5 parts of dibutyl itaconate, 1-5 parts of unsaturated amphoteric quaternary alkylphosphonium salt, 0.2-0.8 part of oxidizer, 0.2-1.0 part of first reducer, 0.02-0.06 part of second reducer, 0.2-0.6 part of chain-transfer agent, a right amount of potassium hydroxide water solution, a right amount of sodium hydroxide water solution and a right amount of deionized water. The polycarboxylic acid water reducing agent has the advantages of more uniform side chain distribution and favorable slump retaining effect, and has excellent low sensitivity to the doping amount changes.

The present invention discloses an early-strength antifreezing polycarboxylate high-performance water reducing agent and a method for preparing the same. The early-strength antifreezing water reducing agent is prepared from a polycarboxylate water reducing agent, an early-strength antifreezing agent, an air entraining agent and water. The method comprises the following steps: A, the synthesis of the polycarboxylate high-performance water reducing agent: (1) esterification reaction; adding methacrylic acid, and the like to a reaction kettle, and (2) polymerization reaction; heating big monomer methoxypolyethyleneglycol methacrylic ester; B, the preparation for the solution of an early-strength antifreezing agent: (1), weighing water and adding the same to the reaction kettle, and adding calcium formate to the reaction kettle, and (2), adding triethanolamine, and the like to the reaction kettle to prepare the early-strength antifreezing agent solution; C, the preparation of the air entraining agent: weighing water and adding the same to the reaction kettle, and adding powdered three-level colophony to the reaction kettle to obtain the air entraining agent; and D, the preparation of the finished product: weighing the polycarboxylate water reducing agent and adding the same to the reaction kettle, and adding the air entraining agent and the early-strength antifreezing agent solution to the reaction kettle. The early-strength antifreezing polycarboxylate high-performance water reducing agent has higher water reducing rate and remarkable enhancing effect, and is suitable to prepare various common concrete and high-performance concrete at a negative temperature range of between 20 DEG C below zero and 0 DEG C.

The invention provides a polar dispersion composition containing 0.5 to 30 parts by mass of an electroconductive carbon black and 0.1 to 30 parts by mass of a styrene-methoxy polyethylene glycol methacrylate copolymer, with respect to 100 parts by mass of the polar dispersion composition. The composition of the invention is easy to handle as a liquid preparation, and develops sufficient electroconductivity when processed into a conductive material.