CN102558935B - A kind of calcium glue paint stabilizer - Google Patents

Abstract

The invention relates to a stabilizing agent for lime colloid paint. The stabilizing agent is prepared by blending 19 weight parts of water, 10 weight parts of polyethyleneglycol mono-methoxy ether acrylate, and 30 weight parts of acrylic acid to prepare a monomer aqueous solution for later use; blending 25 weight parts of water and 0.5 to 2.5 weight parts of ammonium persulfate to prepare an initiator aqueous solution for later use; and adding 1.2 weight parts of sodium methyl allyl sulfonate and 18.5 weight parts of water into a container, heating to the temperature of between 75 and 80 DEGC, dripping the monomer aqueous solution and the initiator aqueous solution, after dripping the monomer aqueous solution and the initiator aqueous solution, heating to the temperature of 87 DEG C forreacting for 2 hours, cooling to the temperature of below 40 DEG C, and adding a sodium hydroxide aqueous solution to regulate the pH value to 7 to 8, wherein the monomer aqueous solution is dripped for 3 hours, and the initiator aqueous solution is dripped for 4 hours. The stabilizing agent has a good effect and is little in using amount, and the prepared lime colloid paint has high performance and is low in cost.

Description

A kind of calcium glue paint stabilizer

technical field

The invention belongs to the preparation technology of coating additives, in particular to a lime-based architectural coating additive.

Background technique

In recent years, with the soaring prices of petrochemical raw materials, the cost of coatings has risen sharply, which has significantly reduced the profit margins of production companies. In this situation, it is difficult to solve the problem of high production cost by tapping the potential of a mature product such as "latex paint". The development of new coatings with high performance and low cost has become the most active choice to change this situation. Calcium glue paint (also known as gray calcium powder coating) is a new type of architectural coating with gray calcium powder as active filler and polymer as adhesive. It can react with carbon dioxide in the air to generate calcium carbonate, which is formed together with film formers. An intricate and tight mesh frame waterproof layer. Therefore, lime calcium powder architectural coatings not only have high scrub resistance and hardness, but also have low raw material costs. The main components of ash calcium powder are calcium oxide, calcium hydroxide and a small amount of calcium carbonate. Among them, calcium oxide and calcium hydroxide are very easy to absorb carbon dioxide in the air in the water system environment, and react to form calcium carbonate. Therefore, ash-calcium powder architectural coatings will produce slow thickening and precipitation during storage, which affects the quality of the coating. In order to improve the storage stability of the ash-calcium powder coating, the ash-calcium powder should be pretreated. The method is to treat ash calcium powder with an electrolyte solution that can be hydrolyzed into a positive colloid. Its mechanism: On the one hand, the anions in this type of electrolyte solution react with ash calcium powder to form water-insoluble substances; on the other hand, the potential ions and counter ions in the hydrolyzed colloidal adsorption layer can be hydrated, thus forming around the colloidal particles. The hydration layer prevents the agglomeration of compounds such as calcium hydroxide and calcium carbonate, and at the same time, to a certain extent, forms the dynamic stability of the entire system (ash calcium powder and electrolyte solution). Therefore, the thickening and precipitation of lime calcium powder coatings are prevented. So far, the relatively successful coatings using ash calcium powder are coating systems based on polyvinyl formal. However, according to the current technical requirements, there are two problems. First, the content of harmful substances in formaldehyde coatings is difficult to meet the requirements of environmental protection; second, the wash resistance of the coating film can generally only be maintained at 70 to 90 times, which is difficult to meet the requirements of GB/T9756-2001 (synthetic resin emulsion interior wall coatings) .

Contents of the invention

The technical problem to be solved by the present invention is to provide a preparation method of calcium gel paint stabilizer aiming at the deficiencies in the background technology.

In order to solve the above-mentioned technical problems, the following technical scheme is adopted: a calcium glue paint stabilizer is prepared by the following components by weight: 19 parts of water, 10 parts of polyethylene glycol monomethoxyether acrylate, 30 parts of acrylic acid 25 parts of water and 0.5~2.5 parts of ammonium persulfate are made into an aqueous solution of initiator for later use; 1.2 parts of sodium methallylsulfonate and 18.5 parts of water are added to the container, and the temperature is raised to 75~ 80°C, start to drop the monomer aqueous solution and the initiator aqueous solution. The monomer aqueous solution is added dropwise in 3 hours, and the initiator aqueous solution is added dropwise in 4 hours. Sodium hydroxide aqueous solution adjusts the pH to 7-8.

The concentration of described sodium hydroxide aqueous solution is 30%.

19 parts of water, 10 parts of polyethylene glycol 1200 monomethoxyether acrylate, and 30 parts of acrylic acid are prepared into an aqueous monomer solution for later use.

The polyethylene glycol 1200 monomethoxy ether acrylate is prepared from the following components in parts by weight: 120 parts of polyethylene glycol 1200 monomethoxy ether, 0.28 parts of hydroquinone, 7.8 parts of acrylic acid, concentrated sulfuric acid 1.07 parts, reacted at 130°C for 8h, obtained by ether precipitation and drying.

The polyethylene glycol monomethoxy ether acrylate can be replaced by polyethylene glycol monomethoxy ether methacrylate, allyl polyoxyethylene ether or methallyl polyoxyethylene ether.

Sodium methallyl sulfonate can be replaced by sodium allyl sulfonate and 2-acrylamido-2-methylpropanesulfonic acid.

Acrylic acid can be replaced by methacrylic acid, itaconic acid, maleic anhydride and tetrahydrophthalic anhydride.

The stabilizing agent of the invention has good effect and less dosage, and the prepared calcium glue paint has good performance and low cost.

The stabilizer contains carboxyl groups and sodium sulfonate anion groups, and the polyether has long side chains and large steric hindrance. It has a high-efficiency chelating force for calcium ions in the paint system, preventing the demulsification of organic binders in calcium-based paints. It has multiple effects on the colloidal particles of lime, such as electrostatic repulsion, steric hindrance, ion shielding and colloidal protection, making it difficult for the colloidal particles of lime to collide and agglomerate in the Brownian motion, so that the paint has stable storage conditions.

Detailed ways

Embodiment 1: a kind of calcium glue paint, is made up of the following pigment, filler , auxiliary agent, base material and dispersion medium by weight: 25～35 parts of ash calcium powder, 5～10 parts of titanium white, 10～15 parts of heavy calcium, 5-10 parts of light calcium, 2-5 parts of sodium bentonite, 0.3 parts of defoamer, 0.4 parts of dispersant, 0.2 parts of wetting agent, 0.1 part of leveling agent, 0.1 part of film-forming aid, and 0.15 parts of thickener 0.35 parts, 0.2-0.6 parts of stabilizer, 6-12 parts of emulsion, 1-47 parts of deionized water.

The preparation process is as follows: in the pre-dispersion stage, lime calcium powder, titanium dioxide, heavy calcium, light calcium, sodium bentonite, dispersant, wetting agent, defoamer, and deionized water are dispersed and mixed in proportion; then the mixture is passed through sand Grinding; in the dispersion stage, add stabilizers, defoamers, film-forming aids, leveling agents, thickeners, and emulsions in proportion and mix well. Among them, 0.2 part of defoamer is used in the pre-dispersion stage, and 0.1 part of defoamer is used in the dispersion stage.

A calcium glue paint stabilizer is prepared by the following components by weight: 19 parts of water, 10 parts of polyethylene glycol monomethoxy ether acrylate, and 30 parts of acrylic acid are made into monomer aqueous solution for subsequent use, and 25 parts of water and 0.5~2.5 parts of ammonium persulfate to prepare an aqueous initiator solution for later use; add 1.2 parts of sodium methallylsulfonate and 18.5 parts of water into the container, raise the temperature to 75~80°C, and start adding the monomer aqueous solution and Initiator aqueous solution, the monomer aqueous solution was added dropwise in 3 hours, the initiator aqueous solution was added dropwise in 4 hours, after the dropwise addition, the temperature was raised to 87°C to continue the reaction for 2 hours, and then the temperature was lowered to below 40°C and the sodium hydroxide aqueous solution was added to adjust the pH to 7-8 .

Wherein, in the stabilizer synthesis process, acrylic acid can be replaced by methacrylic acid, itaconic acid, maleic anhydride tetrahydrophthalic anhydride.

Sodium methallylsulfonate can be replaced by sodium allylsulfonate, 2-acrylamido-2-methylpropanesulfonic acid.

Polyethylene glycol monomethoxy ether acrylate can be replaced by allyl polyoxyethylene ethers with different molecular weights of APEG750, APEG1200, and APEG2000, and allyl polyoxyethylene ethers with different molecular weights of TPEG750, TPEG1000, TPEG1200, and TPEG2400.

APEG750, APEG1200, APEG2000, TPEG750, TPEG1000, TPEG1200, TPEG2400 are all commercially available products.

The stabilizer can be used not only in lime-calcium powder coatings, but also in enamel-like paints, tempered paints, and paste-like putties that add lime-calcium components.

Embodiment 2: A calcium glue paint stabilizer is prepared from the following components by weight: 19 parts of water, 10 parts of polyethylene glycol 1200 monomethoxyether acrylate, and 30 parts of acrylic acid are made into monomer aqueous solution for later use , make 25 parts of water and 0.5~2.5 parts of ammonium persulfate into an aqueous initiator solution for later use; add 1.2 parts of sodium methallylsulfonate and 18.5 parts of water into the container, raise the temperature to 75~80°C, and start dripping Add monomer aqueous solution and initiator aqueous solution. The monomer aqueous solution is added dropwise in 3 hours, and the initiator aqueous solution is added dropwise in 4 hours. After the dropwise addition, the temperature is raised to 87°C to continue the reaction for 2 hours, and then the temperature is lowered to below 40°C and 30% sodium hydroxide is added. The aqueous solution adjusts the pH to 7-8.

Polyethylene glycol 1200 monomethoxy ether acrylate is prepared from the following components by weight: 120 parts of polyethylene glycol 1200 monomethoxy ether, 0.28 parts of hydroquinone, 7.8 parts of acrylic acid, 1.07 parts of concentrated sulfuric acid, Reaction at 130°C for 8h, precipitation with ether, and drying.

Polyethylene glycol 1200 monomethoxy ether (MPEG1200) can be replaced by polyoxyethylene ether monomethoxy ether of different molecular weights such as MPEG600, MPEG750, MPEG1200, MPEG2000.

The components synthesized by the calcium gel paint stabilizer in Examples 3 to 7 are shown in Table 1. Other steps are with embodiment 2.

Table 1.

Use the stabilizers in Example 3 to Example 7 to prepare calcium glue paint, seal the calcium glue paint and place it at 40°C, observe the effect of opening the can after 90 days, and do the scrub resistance test according to GB9266 sample preparation. The results are shown in Table 2 (note: the emulsion used is VAE emulsion, and the dosage is 8wt%).

Table 2

  

Claims (1)

1. calcium shellac varnish stablizer, it is characterized in that being prepared from by weight by following component: it is standby that 19 parts of water, 10 parts of polyoxyethylene glycol 1200 single methoxy ether acrylate, 30 parts of vinylformic acid are made into monomer solution, wherein polyoxyethylene glycol 1200 single methoxy ether acrylate are prepared from by weight by following component: polyoxyethylene glycol 1,200 120 parts in single methoxy ethers, 0.28 part of Resorcinol, 7.8 parts in vinylformic acid, 1.07 parts of the vitriol oils, 130 ℃ of reaction 8h obtain through ether sedimentation, drying; It is standby that 25 parts of water and 0.5 ~ 2.5 part of ammonium persulphate are made into initiator solution; 1.2 parts of methallylsulfonic acid sodium and 18.5 parts of water are added in the container, temperature is risen to 75～80 ℃, begin to drip monomer solution and initiator solution, monomer solution dropwises at 3h, initiator solution dropwises at 4h, dropwise and be warmed up to 87 ℃ of continuation reaction 2h, being cooled to the concentration of adding below 40 ℃ then is that 30% aqueous sodium hydroxide solution is regulated pH to 7～8.