Search

CN-121991279-A - Low-cost ammonia-free waterproof emulsion, preparation method and application method thereof

CN121991279ACN 121991279 ACN121991279 ACN 121991279ACN-121991279-A

Abstract

The invention discloses a low-cost ammonia-free waterproof emulsion, a preparation method and an application method thereof, and belongs to the technical field of cement paint. The preparation method comprises the steps of mixing and stirring an emulsifying agent, a monomer and deionized water to obtain a pre-emulsion, adding the deionized water into a reaction kettle to obtain a kettle bottom material, adding 0.9% of the pre-emulsion and an initiator a into the kettle bottom material in a stirring state, simultaneously dropwise adding the rest pre-emulsion and the initiator b after 15min, controlling the pre-emulsion and the initiator b to be dropwise added simultaneously, preserving heat after the dropwise adding is finished, adding an oxidizing agent and a reducing agent to eliminate residual monomers, adding a neutralizing agent to adjust pH, and adding an auxiliary agent, wherein the emulsifying agent is an anionic emulsifying agent and a nonionic emulsifying agent in a mass ratio of 2-3:1, the monomers comprise styrene, butyl acrylate and a functional monomer, and the functional monomer is hydroxyethyl acrylate and beta-acryloxypropionic acid. The low-cost ammonia-free polymer cement waterproof paint prepared by the emulsion has the advantages of low cost, environmental protection, good construction property and excellent mechanical property.

Inventors

  • HAN JIAQIN
  • ZHANG WEI
  • LIANG JIE

Assignees

  • 上海保立佳新材料有限公司

Dates

Publication Date
20260508
Application Date
20251125

Claims (10)

  1. 1. The preparation method of the low-cost ammonia-free waterproof emulsion is characterized by comprising the following steps of: (1) Preparing a pre-emulsion, namely mixing and stirring an emulsifying agent, a monomer and deionized water for 30min to obtain the pre-emulsion; (2) Preparing a kettle bottom material, namely adding deionized water into a reaction kettle to obtain the kettle bottom material; (3) Adding 0.9% of pre-emulsion and an initiator a into the kettle substrate material under a stirring state, simultaneously dropwise adding the rest of pre-emulsion and the initiator b after 15min, controlling the pre-emulsion and the initiator b to be completely dripped at the same time, controlling the dripping temperature to be 83-85 ℃, and carrying out heat preservation treatment after the dripping is finished for 4 h; (4) Post-treatment, namely adding an oxidant and a reducing agent to eliminate residual monomers, adding a neutralizing agent to adjust pH, and adding an auxiliary agent to obtain the low-cost ammonia-free waterproof emulsion; wherein the emulsifier is a combination of an anionic emulsifier and a nonionic emulsifier in a mass ratio of 2-3:1; The monomer comprises styrene, butyl acrylate and a functional monomer, wherein the functional monomer is hydroxyethyl acrylate and beta-acryloxypropionic acid.
  2. 2. The method for preparing the low-cost ammonia-free waterproof emulsion according to claim 1, wherein the weight ratio of styrene to butyl acrylate in the monomer is 6-8:18-20; The dosage of the functional monomer is 4.0-5.0% of the total weight of the monomers; The mass ratio of the hydroxyethyl acrylate to the beta-acryloyloxy propionic acid in the functional monomer is 12-16:1.
  3. 3. The method for preparing the low-cost ammonia-free waterproof emulsion according to claim 1, wherein the anionic emulsifier is one or two selected from fatty alcohol polyoxyethylene ether sulfate, alkyl diphenyl ether sulfonate, sodium dodecyl sulfate, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and sodium dodecyl polyoxyethylene ether sulfate; And/or the nonionic emulsifier is selected from one or two of alkyl polyoxyethylene ether, fatty alcohol polyoxyethylene ether and sodium alkyl polyoxyethylene ether sulfate; and/or the initiator is persulfate or azo initiator; and/or the oxidant is selected from two of hydrogen peroxide, tert-butyl hydroperoxide and cumene hydroperoxide; and/or the reducing agent is selected from two of ascorbic acid, sodium metabisulfite, sodium bisulphite, FF6M and sodium anti-septicemia; And/or the neutralizer is selected from one of sodium hydroxide, triethylamine, dimethylethanolamine and 2-amino-2-methylpropanol; and/or the auxiliary agent is selected from at least one of 3295 thickener, baolijia BLJ-80 thickener, TT-935 thickener of Dow and UH-450VF thickener of Ai Dike of Corp.
  4. 4. The method for preparing a low-cost ammonia-free waterproof emulsion according to claim 3, wherein the initiator is sodium persulfate; And/or the oxidizing agent is hydrogen peroxide and tert-butyl hydroperoxide; And/or, the reducing agent is ascorbic acid and sodium metabisulfite; and/or the neutralizer is 10% sodium hydroxide solution by mass fraction; and/or, the auxiliary agent is BLJ-80 thickener.
  5. 5. The method for preparing the low-cost ammonia-free waterproof emulsion according to claim 1, wherein the emulsifier accounts for 0.8% -1.0% of the total weight of the low-cost ammonia-free waterproof emulsion; and/or the dosage of the initiator is 0.2% -0.4% of the total weight of the monomers; And/or the dosage of the oxidant is 0.15% -0.3% of the total weight of the monomers; And/or the dosage of the reducing agent is 0.1% -0.2% of the total weight of the monomers; and/or the dosage of the neutralizer is 1.5% -2.0% of the total weight of the low-cost ammonia-free waterproof emulsion; and/or the dosage of the auxiliary agent is 0.3-0.5% of the total weight of the low-cost ammonia-free waterproof emulsion.
  6. 6. The method for preparing a low-cost ammonia-free waterproof emulsion according to claim 1, wherein in the step (1), the mass ratio of the dosage of deionized water to the total weight of the monomers is 9.5-10:53; and/or in the step (2), the mass ratio of the dosage of the deionized water to the total weight of the monomers is 15-15.5:53.
  7. 7. The method for preparing a low-cost ammonia-free waterproof emulsion according to claim 1, wherein in the step (3), the usage ratio of the initiator a to the initiator b is 1.5-2:1; And/or, in the step (3), the heat preservation treatment time is 30-120 min; and/or in the step (3), the temperature of the heat preservation treatment is 83-85 ℃; and/or, in step (4), the oxidizing agent is added in the form of an aqueous solution; and/or, in step (4), the reducing agent is added in the form of an aqueous solution; and/or, in the step (4), the neutralizing agent is added in the form of an aqueous solution.
  8. 8. A low-cost ammonia-free waterproof emulsion prepared by the method for preparing the low-cost ammonia-free waterproof emulsion of claims 1-7.
  9. 9. The application method of the low-cost ammonia-free waterproof emulsion in preparing the low-cost ammonia-free polymer cement waterproof paint according to claim 8 is characterized by comprising the steps of preparing the low-cost ammonia-free waterproof emulsion into liquid material, and stirring and mixing the liquid material and powder material according to a liquid-powder ratio of 1:1.5 to obtain the low-cost ammonia-free polymer cement waterproof paint.
  10. 10. The application method of the low-cost ammonia-free waterproof emulsion in preparing the low-cost ammonia-free polymer cement waterproof paint, which is disclosed in claim 9, is characterized in that the liquid comprises 83% -87% of the low-cost ammonia-free waterproof emulsion, 10% -15% of H 2 O, 0.5% of dispersing agent SN-DISPERSANT 50400.1%, 0.1% -0.4% of defoaming agent SN-DEFOAMERNXZ and 0.1% -0.4% of defoaming agent FoamStarA 100; And/or the powder comprises 30-50% of PO42.5 cement, 15-25% of 200-mesh quartz powder, 25-35% of 80-120-mesh quartz sand and 10-20% of 400-mesh heavy calcium carbonate.

Description

Low-cost ammonia-free waterproof emulsion, preparation method and application method thereof Technical Field The invention belongs to the technical field of cement paint, and particularly relates to a low-cost ammonia-free waterproof emulsion, a preparation method and an application method thereof. Background Along with the improvement of living standard, the environmental protection consciousness of people is continuously enhanced, and the paint industry is developing towards no pollution and no production of pungent odor such as ammonia, formaldehyde and the like. However, in the conventional waterproof paint manufacturing and construction process, although volatile ammonia raw materials are not added in the production process, the finished product still emits unpleasant ammonia smell. This ammonia smell was analyzed to originate mainly from the water-repellent emulsion. The ammonia smell in the waterproof emulsion mainly comes from two aspects, namely that ammonia water is used as a pH value regulator in the emulsion, certain harm is caused to the body of a manufacturing and construction person by volatilizing the ammonia water when the waterproof coating is manufactured and constructed, and acrylamide and materials containing amide groups are used as crosslinking monomers in the emulsion synthesis process, and the amide groups react after meeting cement to destroy amide bonds, so that ammonia gas is generated and certain harm is caused to the body of the manufacturing and construction person. In order to solve the above problems, various improvement methods have been adopted in China. For example, patent CN114478892B incorporates polar monomers such as poly (propylene glycol) acrylate, hydroxyethyl acrylate, and hydroxypropyl acrylate during the emulsion synthesis. The hydroxyl groups of the polar monomers can be crosslinked with the monomers such as acrylic acid, n-butyl acrylate and the like, so that the styrene-acrylic emulsion particles have stronger adhesive force, and the adhesive strength of the styrene-acrylic emulsion, cement, sand and a base material is further improved. In addition, the hydroxyl groups of the poly (propylene glycol) acrylic ester, the hydroxyethyl acrylate and the hydroxypropyl acrylate can also form a stable network structure among the styrene-acrylic emulsion particles, so that the aggregation and sedimentation of the styrene-acrylic emulsion particles are avoided, the stability is improved, and the styrene-acrylic emulsion particles have good compatibility with pigment and filler. However, too much hydrophilic monomer is selected in the above patent, which results in too high water absorption of the coating film and high production cost, which limits practical application. Disclosure of Invention In order to overcome the technical problems in the prior art, the invention provides a low-cost ammonia-free waterproof emulsion, a preparation method and an application method thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: in one aspect of the invention, a preparation method of a low-cost ammonia-free waterproof emulsion is provided, which comprises the following steps: (1) Preparing a pre-emulsion, namely mixing and stirring an emulsifying agent, a monomer and deionized water for 30min to obtain the pre-emulsion; (2) Preparing a kettle bottom material, namely adding deionized water into a reaction kettle to obtain the kettle bottom material; (3) Adding 0.9% of pre-emulsion and an initiator a into the kettle substrate material under a stirring state, simultaneously dropwise adding the rest of pre-emulsion and the initiator b after 15min, controlling the pre-emulsion and the initiator b to be completely dripped at the same time, controlling the dripping temperature to be 83-85 ℃, and carrying out heat preservation treatment after the dripping is finished for 4 h; (4) Post-treatment, namely adding an oxidant and a reducing agent to eliminate residual monomers, adding a neutralizing agent to adjust pH, and adding an auxiliary agent to obtain the low-cost ammonia-free waterproof emulsion; wherein the emulsifier is a combination of an anionic emulsifier and a nonionic emulsifier in a mass ratio of 2-3:1; The monomer comprises styrene, butyl acrylate and a functional monomer, wherein the functional monomer is hydroxyethyl acrylate and beta-acryloxypropionic acid. As a still further scheme of the invention, the weight ratio of the styrene to the butyl acrylate in the monomer is 6-8:18-20; The dosage of the functional monomer is 4.0-5.0% of the total weight of the monomers; The mass ratio of the hydroxyethyl acrylate to the beta-acryloyloxy propionic acid in the functional monomer is 12-16:1. As a still further scheme of the invention, the anionic emulsifier is one or two selected from fatty alcohol polyoxyethylene ether sulfate (such as fatty alcohol polyoxyethylene ether sodium sulfate, CAS No. 9004-82-4), alkyl diphenyl eth