阅读说明：本技术 一种苯丙乳液 (Styrene-acrylic emulsion ) 是由 吕书人 于 2020-05-28 设计创作，主要内容包括：本发明涉及乳液涂料的技术领域,具体涉及一种苯丙乳液,按重量份包括以下组分：丙烯酸酯单体85～105份、苯乙烯单体55～75份、丙烯酸丁酯1～5份、耐候材料4～10份、碳酸氢纳1～8份、硅烷偶联剂1～4份、乳化剂2～3份、引发剂1～3份以及去离子水150～300份；所述耐水材料按重量份包括以下组分：脂肪醇聚乙烯磺酸钠15～30份、二氧化硅粉10～20份、硅酮酰胺5～15份、己二胺2～10份以及三乙烯四胺2～5份。本发明的配方制备的苯丙乳液具有良好的耐候性,应用于涂料行业使得涂层同样具备良好的耐候性。(The invention relates to the technical field of emulsion coatings, and particularly relates to a styrene-acrylic emulsion which comprises the following components in parts by weight: 85-105 parts of acrylate monomer, 55-75 parts of styrene monomer, 1-5 parts of butyl acrylate, 4-10 parts of weather-resistant material, 1-8 parts of sodium bicarbonate, 1-4 parts of silane coupling agent, 2-3 parts of emulsifier, 1-3 parts of initiator and 150-300 parts of deionized water; the waterproof material comprises the following components in parts by weight: 15-30 parts of fatty alcohol-polyethylene sodium sulfonate, 10-20 parts of silicon dioxide powder, 5-15 parts of silicone amide, 2-10 parts of hexamethylene diamine and 2-5 parts of triethylene tetramine. The styrene-acrylic emulsion prepared by the formula has good weather resistance, and can be applied to the coating industry to ensure that the coating has good weather resistance.)

1. The styrene-acrylic emulsion comprises the following components in parts by weight: 85-105 parts of acrylate monomer, 55-75 parts of styrene monomer, 1-5 parts of butyl acrylate, 4-10 parts of weather-resistant material, 1-8 parts of sodium bicarbonate, 1-4 parts of silane coupling agent, 2-3 parts of emulsifier, 1-3 parts of initiator and 150-300 parts of deionized water;

the waterproof material comprises the following components in parts by weight: 15-30 parts of fatty alcohol-polyethylene sodium sulfonate, 10-20 parts of silicon dioxide powder, 5-15 parts of silicone amide, 2-10 parts of hexamethylene diamine and 2-5 parts of triethylene tetramine.

2. The styrene-acrylic emulsion according to claim 1, wherein: the components also comprise 3-7 parts of titanate and 2-6 parts of 2-aminoethyl ethylene urea.

3. The styrene-acrylic emulsion according to claim 1, wherein: the components also comprise 1-5 parts of hydroxyethyl methyl cellulose.

4. The styrene-acrylic emulsion according to claim 1, wherein: the components also comprise 1-5 parts of amino modified polydimethylsiloxane.

5. The styrene-acrylic emulsion according to claim 1, wherein: the composite material further comprises 2-10 parts of reinforcing filler, wherein the reinforcing filler comprises diatomite, flake graphite and titanium dioxide powder.

6. The styrene-acrylic emulsion according to claim 5, wherein: the mass ratio of the diatomite to the crystalline flake graphite to the titanium dioxide powder is (2-3.5): 1: (1-2).

7. The styrene-acrylic emulsion according to claim 1, wherein: the emulsifier is polyvinyl alcohol.

8. The styrene-acrylic emulsion according to claim 1, wherein: the initiator is ammonium persulfate.

Technical Field

The invention relates to the technical field of emulsion coatings, in particular to a styrene-acrylic emulsion.

Background

The styrene-acrylic emulsion is prepared by emulsion copolymerization of styrene and acrylic ester monomer. The styrene-acrylic emulsion is a system which is researched more in emulsion polymerization and is one of ten non-crosslinked emulsions with important industrial application value in the world nowadays. The styrene-acrylic emulsion has wide application as an important intermediate chemical product, and is mainly used as building coating, metal surface latex coating, floor coating, paper adhesive, adhesive and the like.

The existing styrene-acrylic emulsion mainly comprises a styrene monomer, an acrylate monomer, an emulsifier and an initiator, although the styrene-acrylic emulsion prepared by the formula has good oil resistance, heat resistance and aging resistance, the styrene-acrylic emulsion coating prepared by using the styrene-acrylic emulsion as a main material has poor adhesion performance and water resistance, and is easy to fall off from the surface of a base material when contacting an external environment for a long time, so that the weather resistance of the styrene-acrylic emulsion coating is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a styrene-acrylic emulsion which has good weather resistance.

The purpose is realized by the following technical scheme:

the styrene-acrylic emulsion comprises the following components in parts by weight: 85-105 parts of acrylate monomer, 55-75 parts of styrene monomer, 1-5 parts of butyl acrylate, 4-10 parts of weather-resistant material, 1-8 parts of sodium bicarbonate, 1-4 parts of silane coupling agent, 2-3 parts of emulsifier, 1-3 parts of initiator and 150-300 parts of deionized water;

the weather-resistant material comprises the following components in parts by weight: 15-30 parts of fatty alcohol-polyethylene sodium sulfonate, 10-20 parts of silicon dioxide powder, 5-15 parts of silicone amide, 2-10 parts of hexamethylene diamine and 2-5 parts of triethylene tetramine.

By adopting the technical scheme, the sodium fatty alcohol polyvinyl sulfonate has higher surface activity, can reduce the surface tension of the styrene-acrylic emulsion, and forms an electric double-layer arrangement structure on the surface of a styrene-acrylic emulsion liquid film, so that air is enclosed to form a large amount of micro bubbles between the electric double layers, the micro bubbles are like balls, the friction resistance among component particles is reduced, and the flowability of the styrene-acrylic emulsion is improved; the existence of a large amount of closed micro bubbles blocks or cuts off capillary water seepage channels in the styrene-acrylic emulsion, and changes the inner hole structure of the styrene-acrylic emulsion, thereby greatly improving the water resistance of the styrene-acrylic emulsion; the bubbles have larger elastic deformation capacity and have certain buffer effect on expansion stress generated by water freezing, so that the freezing resistance of the styrene-acrylic emulsion is improved, and the weather resistance is improved along with the improvement;

because the coated base material is mostly a concrete material, silicon element in silicon dioxide molecules has good permeability and can easily penetrate through the surface layer of the concrete base material to permeate into the interior of the concrete base material, the interlayer adsorption performance between the coating prepared by taking styrene-acrylic emulsion as the base material and the concrete base material can be improved, and the weather resistance of the coating can be improved; the silicon dioxide also has the function of improving the suspension stability among the components, thereby preventing the components from sinking to influence the crosslinking curing efficiency among the components;

the silicone amide has strong dispersibility, can uniformly disperse and suspend solid particles in the styrene-acrylic emulsion, and has the functions of obviously improving the pore structure and reducing the holes, thereby improving the strength of the styrene-acrylic emulsion, reducing the possibility of cracking and peeling of the styrene-acrylic emulsion coating under various climates and improving the weather resistance of the styrene-acrylic emulsion coating;

the water resistance of the styrene-acrylic emulsion is improved, and the improvement of the water resistance is beneficial to reducing the wettability of the styrene-acrylic emulsion under various climates so as to further improve the weather resistance of the styrene-acrylic emulsion;

the weather-resistant materials are cooperated with each other to act in a styrene-acrylic emulsion system, so as to realize the effect of improving the weather resistance of the styrene-acrylic emulsion.

The present invention in a preferred example may be further configured to: the components also comprise 3-7 parts of titanate and 2-6 parts of 2-aminoethyl ethylene urea.

By adopting the technical scheme, the main metal elements in the concrete base material comprise iron, the number of empty tracks on the periphery of the iron elements is large, the mutual selectivity between the iron elements and the molecular groups of titanate is determined by the space among the crystal lattices and the activity of atomic reaction, and coordination bonds are formed between the iron elements and the molecular groups, so that the wettability of the coating prepared by taking the styrene-acrylic emulsion as the base material on the surface of the concrete base material is improved, the titanate is adsorbed on the surface of the base material and even permeates into the base material, the adhesive force between the coating and the base material is improved, and the weather resistance of the styrene-acrylic emulsion coating is improved;

because the concrete base material is mostly silicate inorganic material, the 2-aminoethyl ethylene urea and the silicate inorganic material have good adsorption performance, thereby improving the adhesive strength between the styrene-acrylic emulsion coating and the base material, reducing the possibility of cracking and peeling of the styrene-acrylic emulsion coating under various climates and improving the weather resistance of the styrene-acrylic emulsion coating.

The present invention in a preferred example may be further configured to: the components also comprise 1-5 parts of hydroxyethyl methyl cellulose.

By adopting the technical scheme, the molecular structure of the hydroxyethyl methyl cellulose contains a large amount of hydroxyl, and the hydroxyl reacts and bonds with oxygen atoms and hydroxyl groups on the surface of the base material, so that the interlayer adsorption force between the styrene-acrylic emulsion coating and the base material is improved, the connection strength between the styrene-acrylic emulsion coating and the base material is improved, and the weather resistance of the styrene-acrylic emulsion coating is improved.

The present invention in a preferred example may be further configured to: the components also comprise 1-5 parts of amino modified polydimethylsiloxane.

By adopting the technical scheme, the amino modified polydimethylsiloxane contains siloxy in the molecular structure, and the siloxy can react with an oxide on the surface of a metal material in the concrete substrate to form a coordination bond, so that the interlayer adsorption force between the styrene-acrylic emulsion coating and the substrate is improved, the connection strength between the styrene-acrylic emulsion coating and the substrate is improved, and the weather resistance of the styrene-acrylic emulsion coating is improved.

The present invention in a preferred example may be further configured to: the composite material further comprises 2-10 parts of reinforcing filler, wherein the reinforcing filler comprises diatomite, flake graphite and titanium dioxide powder.

By adopting the technical scheme, the diatomite has the characteristics of fineness, looseness, light weight, porosity, high water absorption and high permeability, and has good viscosity and a certain reinforcing effect when dispersed in a system; the titanium dioxide has good tolerance and viscosity; the crystalline flake graphite and the titanium dioxide powder are intercalated into the molecular structure of the diatomite and are cooperated with each other to improve the strength of the styrene-acrylic emulsion;

the scaly graphite is selected because the special scaly structure has the functions of cutting off capillary pores in the styrene-acrylic emulsion film and shielding corrosion factor permeation; the parallel overlapped scales play a labyrinth effect in the styrene-acrylic emulsion, and prolong the path of corrosion factors entering the styrene-acrylic emulsion, so that the corrosion resistance of the styrene-acrylic emulsion coating is improved, and the weather resistance of the styrene-acrylic emulsion coating prepared by taking the styrene-acrylic emulsion as a base material is improved.

The present invention in a preferred example may be further configured to: the mass ratio of the diatomite to the crystalline flake graphite to the titanium dioxide powder is (2-3.5): 1: (1-2).

The present invention in a preferred example may be further configured to: the emulsifier is polyvinyl alcohol.

By adopting the technical scheme, the polyvinyl alcohol is a non-ionic emulsifier, does not generate ionization in water, does not influence the mixing polymerization among other components, is cheap and easy to obtain, and is used as the emulsifier in the scheme.

The present invention in a preferred example may be further configured to: the initiator is ammonium persulfate.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the sodium fatty alcohol polyvinyl sulfonate, the silicon dioxide powder, the silicone amide, the hexamethylene diamine and the triethylene tetramine are cooperatively acted in a styrene-acrylic emulsion system to achieve the effect of improving the weather resistance of the styrene-acrylic emulsion;

2. the titanate and the 2-aminoethyl ethylene urea are added to improve the weather resistance of the styrene-acrylic emulsion from the viewpoint of improving the adhesive strength between the styrene-acrylic emulsion coating and a base material, thereby reducing the possibility that the styrene-acrylic emulsion coating cracks and peels in various climates;

3. the molecular structure of the hydroxyethyl methyl cellulose contains a large amount of hydroxyl, and the hydroxyl reacts with oxygen atoms and hydroxyl groups on the surface of the base material to be bonded, so that the interlayer adsorption force between the styrene-acrylic emulsion coating and the base material is improved, the connection strength between the styrene-acrylic emulsion coating and the base material is improved, and the weather resistance of the styrene-acrylic emulsion coating is improved.

Detailed Description