Search

CN-116715796-B - Styrene-acrylic emulsion, preparation method and application thereof

CN116715796BCN 116715796 BCN116715796 BCN 116715796BCN-116715796-B

Abstract

The invention belongs to the technical field of building coating, and relates to a styrene-acrylic emulsion which comprises, by mass, 1-40 parts of styrene, 1-30 parts of butyl acrylate, 0.1-1 part of acid monomer, 0.01-1 part of acrylamide, 0.01-1 part of film forming solvent, 0.01-1 part of cross-linking agent, 0.1-2 parts of anionic emulsifier, 0.1-2 parts of nonionic emulsifier, 0.01-0.5 part of oxidant, 0.01-0.5 part of reducing agent, 0.01-1 part of initiator, 0.01-0.5 part of pH buffering agent, 0.1-1 part of neutralizer, 0.02-1 part of defoamer, 0.02-1 part of preservative and 44-56 parts of water. The invention also provides a preparation method of the styrene-acrylic emulsion and application of the styrene-acrylic emulsion in the interior wall coating, the interior wall coating prepared by using the styrene-acrylic emulsion does not need a solvent, and the coating has excellent washing resistance, low-temperature stability and stagnation brushing property.

Inventors

  • YANG SHIGUO
  • HAO LIJUAN
  • TIAN HAICHANG
  • HE JUN
  • YAN SHUDE
  • TIAN JUN

Assignees

  • 广东衡光新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20230710

Claims (8)

  1. 1. A preparation method of styrene-acrylic emulsion is characterized by comprising, by mass, 1-40 parts of styrene, 1-30 parts of butyl acrylate, 0.1-1 part of acid monomer, 0.01-1 part of acrylamide, 0.01-1 part of film forming solvent, 0.01-1 part of cross-linking agent, 0.1-2 parts of anionic emulsifier, 0.1-2 parts of nonionic emulsifier, 0.01-0.5 part of oxidant, 0.01-0.5 part of reducing agent, 0.01-1 part of initiator, 0.01-0.5 part of pH buffer, 0.1-1 part of neutralizer, 0.02-1 part of defoamer, 0.02-1 part of preservative and 44-56 parts of water, wherein the film forming solvent is at least one of dibutyl maleate, dioctyl maleate and diisooctyl maleate; the preparation method comprises the following steps: A. Preparing a base solution by weighing 15-20 parts of water, 0.02-0.5 part of anionic emulsifier and 0.01-0.5 part of pH buffer, adding into a reaction kettle a, and heating to 65-80 ℃ to obtain the base solution; B. Preparing a pre-emulsion in the front section, namely weighing 12-16 parts of water, 0.06-1 part of anionic emulsifier and 0.05-1 part of nonionic emulsifier, adding the water, the anionic emulsifier and the nonionic emulsifier into an emulsifying kettle a, uniformly stirring, adding 0.25-10 parts of styrene, 0.8-24 parts of butyl acrylate and 0.05-0.5 part of acid monomer, and uniformly stirring to obtain the pre-emulsion in the front section; C. Preparing an initiator solution by weighing 0.01-1 part of initiator, adding the initiator into 4-6 parts of water, and uniformly stirring to obtain the initiator solution; D. 13-14 parts of water, 0.02-0.5 part of anionic emulsifier and 0.05-1 part of nonionic emulsifier are weighed and added into an emulsifying kettle b to be uniformly stirred, then 0.75-30 parts of styrene, 0.2-6 parts of butyl acrylate, 0.01-1 part of film forming solvent, 0.05-0.5 part of acid monomer, 0.01-1 part of acrylamide and 0.01-1 part of cross-linking agent are added, and the mixture is uniformly stirred to obtain the rear-stage pre-emulsion; E. Preparing seed emulsion, namely weighing 5-10% of pre-emulsion in the front section, adding the pre-emulsion into the base solution in the step A, adding 25-35% of initiator solution when the temperature reaches 65-82 ℃, and reacting for 15-20 minutes; F. The preparation of the styrene-acrylic emulsion comprises the steps of dropwise adding the rest pre-emulsion at the front stage after 15-20 minutes of seed emulsion reaction, dropwise adding the rest pre-emulsion for 2-3 hours, dropwise adding the solution at 66-84 ℃ at the same time, initiating the solution to start dropwise adding, keeping the temperature for 30-45 minutes after the completion of the front-stage emulsion dropwise adding, then dropwise adding the post-stage pre-emulsion for 30-40 minutes, keeping the temperature for 1.5-2.0 hours after the completion of dropwise adding the temperature for 80-84 ℃, then synchronously dropwise adding 0.01-0.5 part of oxidant and 0.01-0.5 part of reducing agent, dropwise adding the neutralizing agent, 0.02-1 part of the neutralizing agent and 0.02-1 part of the preservative after the completion of dropwise adding the neutralizing agent and the neutralizing agent for 25-35 minutes, and uniformly stirring to obtain the styrene-acrylic emulsion.
  2. 2. The method for preparing styrene-acrylic emulsion according to claim 1, wherein the acid monomer is at least one of acrylic acid, itaconic acid, fumaric acid, maleic acid, and 2-acrylamido-2-methylpropanesulfonic acid.
  3. 3. The method of claim 1 wherein the cross-linking agent is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, and gamma-methacryloxypropyl trimethoxysilane.
  4. 4. The method for preparing styrene-acrylic emulsion according to claim 1, wherein the anionic emulsifier is at least one of sodium fatty alcohol polyoxyethylene ether (3-6 EO) sulfate, disodium alkyl alcohol ether (2-6 EO) succinate monoester, and sodium fatty alcohol polyoxyethylene ether (4-8 EO) sulfate.
  5. 5. The method for preparing styrene-acrylic emulsion according to claim 1, wherein the nonionic emulsifier is at least one of the isomeric undecylenoxyethylene ether (40 EO) and the isomeric tridecyl polyoxyethylene ether (40 EO).
  6. 6. The method for preparing styrene-acrylic emulsion according to claim 1, wherein the pH buffer is at least one of disodium hydrogen phosphate, sodium dihydrogen phosphate and sodium bicarbonate; the neutralizer is at least one of sodium pyrophosphate and sodium carbonate.
  7. 7. The application of the styrene-acrylic emulsion according to claim 1, wherein the styrene-acrylic emulsion is used as a component of an interior wall coating, and the interior wall coating comprises, by mass, 16-22 parts of water, 0.4-1 part of hydroxyethyl cellulose, 0.05-0.2 part of 2-amino-2-methyl-1-propanol, 3 parts of titanium dioxide, 32-56 parts of filler, 5-24 parts of film forming solvent, 8-12 parts of styrene-acrylic emulsion, 0.1-1 part of defoamer, 0.1-1 part of dispersant, 0.1-0.5 part of wetting agent, 0.01-0.5 part of thickener, 0.1-1 part of preservative and 0.2-1 part of mildew inhibitor.
  8. 8. The use of the styrene-acrylic emulsion according to claim 7, wherein the filler comprises 25-40 parts of heavy calcium carbonate with a mesh number of 600-800 meshes, 5-10 parts of calcined kaolin with a mesh number of 3750-4250 meshes and 2-6 parts of water-washed kaolin with a mesh number of 3750-4250 meshes.

Description

Styrene-acrylic emulsion, preparation method and application thereof Technical Field The invention belongs to the technical field of building coating, and relates to a styrene-acrylic emulsion, a preparation method and application thereof. Background The inner wall emulsion can be made into an inner wall paint, and is coated on the inner wall surface of a building in various scenes to play roles in protection and decoration and beautification, the existing products on the market do not add a hydrophilic solvent or a film forming solvent in the inner wall paint, the simple reduction of the glass transition temperature of the emulsion cannot meet the solvent-free requirement, the Chinese patent No. ZL108285505A adopts high EO anions as a main emulsifier, the water absorption rate is high, the scrubbing resistance is low, and therefore, a functional monomer with higher price is required to be used for balancing scrubbing resistance, the styrene is subjected to two-stage dropwise addition, firstly, the styrene is easy to invert to form a hard core, secondly, the polystyrene is even becomes a hard shell or a hard segment, the scrubbing resistance is improved due to the strong hydrophobicity, and meanwhile, the hydrophilic requirement on the system is high, namely the high EO emulsifier requirement is high, the residual monomer is easy to treat, and the content of volatile matters is high. Disclosure of Invention The invention aims to solve the problems in the prior art, and provides the styrene-acrylic emulsion, and the interior wall coating prepared from the styrene-acrylic emulsion does not need a solvent, and is excellent in washing resistance, low-temperature stability and stagnation. The invention adopts the specific technical scheme that: the styrene-acrylic emulsion comprises, by mass, 1-40 parts of styrene, 1-30 parts of butyl acrylate, 0.1-1 part of an acid monomer, 0.01-1 part of acrylamide, 0.01-1 part of a film-forming solvent, 0.01-1 part of a cross-linking agent, 0.1-2 parts of an anionic emulsifier, 0.1-2 parts of a nonionic emulsifier, 0.01-0.5 part of an oxidizing agent, 0.01-0.5 part of a reducing agent, 0.01-1 part of an initiator, 0.01-0.5 part of a pH buffering agent, 0.1-1 part of a neutralizing agent, 0.02-1 part of an antifoaming agent, 0.02-1 part of a preservative and 44-56 parts of water. Further, the acid monomer is at least one of acrylic acid, itaconic acid, fumaric acid, maleic acid and 2-acrylamido-2-methylpropanesulfonic acid; Further, the cross-linking agent is at least one of vinyl trimethoxy silane, vinyl triethoxy silane and gamma-methacryloxypropyl trimethoxy silane. Further, the anionic emulsifier is at least one of fatty alcohol polyoxyethylene ether (3-6 EO) sodium sulfate, alkyl alcohol ether (2-6 EO) succinic acid monoester disodium and fatty alcohol polyoxyethylene ether (4-8 EO) sodium sulfate; Further, the nonionic emulsifier is at least one of isoundecylenic polyoxyethylene ether (40 EO) and isotridecyl polyoxyethylene ether (40 EO). Further, the initiator is one of ammonium persulfate, potassium persulfate or sodium persulfate. The preparation method of the styrene-acrylic emulsion comprises the following steps: A. preparing a base solution by weighing 15-20 parts of water, 0.02-0.5 part of anionic emulsifier and 0.01-0.5 part of pH buffer, adding into a container a, and heating to 65-80 ℃ to obtain the base solution; B. Preparing a pre-emulsion in the front section, namely weighing 12-16 parts of water, 0.06-1 part of anionic emulsifier and 0.05-1 part of nonionic emulsifier, adding into a container a, uniformly stirring, adding 0.25-10 parts of styrene, 0.8-24 parts of butyl acrylate and 0.05-0.5 part of acid monomer, and uniformly stirring to obtain the pre-emulsion in the front section; C. Preparing an initiator solution by weighing 0.01-1 part of initiator, adding the initiator into 4-6 parts of water, and uniformly stirring to obtain the initiator solution; D. 13-14 parts of water, 0.02-0.5 part of anionic emulsifier and 0.05-1 part of nonionic emulsifier are weighed and added into a container b for uniform stirring, then 0.75-30 parts of styrene, 0.2-6 parts of butyl acrylate, 0.01-1 part of film forming solvent, 0.05-0.5 part of acid monomer, 0.01-1 part of acrylamide and 0.01-1 part of cross-linking agent are added, and the mixture is uniformly stirred to obtain the rear-stage pre-emulsion; E. Preparing seed emulsion, namely weighing 5-10% of pre-emulsion in the front section, adding the pre-emulsion into the base solution in the step A, adding 25-35% of initiator solution when the temperature reaches 65-82 ℃, and reacting for 15-20 minutes; F. The preparation of the styrene-acrylic emulsion comprises the steps of dropwise adding the rest pre-emulsion at the front stage after 15-20 minutes of seed emulsion reaction, dropwise adding the rest pre-emulsion for 2-3 hours, dropwise adding the solution at 66-84 ℃ at the same time, initiating the solution to star