Acrylic acid emulsion with wide particle size distribution and preparation method thereof

A technology of acrylic emulsion and acrylic acid, applied in the direction of coating, can solve the problems of complex process realization, and achieve the effect of convenient transportation

Active Publication Date: 2021-03-30
山西省应用化学研究所(有限公司) +1
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if two emulsions with different particle sizes are mixed separately, it is difficult to obtain a relatively continuous particle size distribution of the emulsion by adding the polymerized emulsion in the late stage of the reaction or using the emulsion as a seed in the reaction, and the process realization is more complicated.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acrylic acid emulsion with wide particle size distribution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method comprises the following steps:

[0026] (1) Add 35% of the total water and 50% of the total emulsifier into the pre-emulsification tank, add butyl acrylate, styrene, acrylic acid and acrylonitrile monomers under stirring conditions, and react to obtain a pre-emulsion;

[0027] (2) Release 5% of the total amount of pre-emulsion into the seed emulsion tank, and add sodium bicarbonate, 30% of the total amount of initiator, 50% of emulsifier and 60% of water into the seed emulsion tank ; The temperature is raised to 80°C-85°C for polymerization; preferably, the temperature is raised to 80°C for 30 minutes.

[0028] (3) Add acrylamide and 50% of the total amount of initiator to the pre-emulsion tank, and stir evenly; add liquid from the pre-emulsion tank to the seed emulsion tank, and at the same time, continuously pour the liquid in the seed emulsion tank into the pre-emulsion tank Medium pumping, control the pumping speed to be lower than the droppi...

Embodiment 1

[0039] Add 29.8 kg of water and 1 kg of emulsifier TR / 2030-S into the 100 L pre-emulsification tank, start stirring and add 40 kg of butyl acrylate, 25 kg of styrene, 2 kg of acrylic acid, and 10 kg of acrylonitrile under stirring. After stirring for 20 minutes, 5.4 kg of the pre-emulsion was metered out to a 200 L seed emulsion polymerization kettle, and 0.3 kg of initiator ammonium persulfate, 0.6 kg of emulsifier, 51 kg of water and 0.2 kg of water were added to the 200 L of seed emulsion polymerization kettle kg of sodium bicarbonate, and the temperature was raised to 80°C for 30 minutes of polymerization. Add 2 kg of acrylamide and 0.5 kg of ammonium persulfate to the 100 L pre-emulsification tank and stir evenly, then start to add dropwise to the polymerization tank, and at the same time pump the liquid in the polymerization tank into the pre-emulsification tank continuously, and the speed is controlled at the dropping speed Half of the amount, the dropwise addition time...

Embodiment 2

[0041]Add 33.3 kg of water and 1.5 kg of emulsifier A6820 into the 100 L pre-emulsification tank, start stirring and add 40 kg of butyl acrylate, 30 kg of styrene, 3 kg of acrylic acid, and 12 kg of acrylonitrile under stirring. After stirring for 20 minutes, 6 kg of the pre-emulsion was metered out to a 200 L seed emulsion polymerization kettle, and 0.36 kg of initiator ammonium persulfate, 1.5 kg of emulsifier, 57 kg of water and 0.3 kg of water were added to the 200 L of seed emulsion polymerization kettle. kg of sodium bicarbonate, and the temperature was raised to 80°C for 30 minutes of polymerization. Add 3 kg of acrylamide and 0.6 kg of ammonium persulfate to the 100 L pre-emulsification tank and stir evenly, then start to add dropwise to the polymerization tank, and at the same time, pump the liquid in the polymerization tank into the pre-emulsification tank continuously, and the speed is controlled at the dropping speed Half of the solution, control the dropping time ...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for preparing an acrylic emulsion with a wide particle size distribution. The production process adopted in the invention is a seed emulsion polymerization plus a circular dripping method, and the polymerized seed emulsion is continuously returned to a pre-emulsion tank together with a pre-emulsification monomer. Add it dropwise into the reaction tank, and adjust the particle size of the seed emulsion to obtain an acrylic emulsion. The particle size distribution of the acrylic emulsion is wide, which can realize the preparation of high-solid and low-viscosity acrylic emulsion, which is convenient for the transportation, storage and use of acrylic emulsion . The particle size of the emulsion is continuously distributed, and the emulsions of different particle sizes fill each other to achieve the maximum accumulation, and there will be no problems of too large a difference in particle size or poor stability caused by large particle size emulsions.

Description

technical field [0001] The invention belongs to the field of acrylic emulsion polymerization, in particular to a method for preparing an acrylic emulsion with a wide particle size distribution. Background technique [0002] Acrylic emulsion is a dispersion of spherical particle polymer in water, and its maximum volume fraction is 74% for a polymer emulsion with a monodisperse surface without a hydration layer. But in reality, the emulsion particles are not completely spherical and the particle size distribution is polydisperse, and the molecules with small particle sizes must fill the gaps between large particle sizes. Moreover, during the drying process, the emulsion particles are first squeezed into irregular spherical particles, the water evaporates, and finally the spherical shape is extruded into a polygonal surface to solidify, so it is difficult to prepare a high-gloss coating for the emulsion system. Especially in leather edge oil, a large amount of starch with a pa...

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): C08F220/18C08F212/10C08F220/06C08F220/48C08F220/56C08F2/30C08F2/26C09D133/26
CPCC08F220/18C08F2/30C08F2/26C09D133/26C08F220/1804
Inventor 吴建兵李萍马小龙刘伟郝静梁庆丰马国章
Owner 山西省应用化学研究所(有限公司)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap