The internal structure of the aqueous acrylic emulsion particles will have an impact on several aspects of the water-based paint formulation. the phase structure will first affect the choice and addition of film forming auxiliaries.Different phases have different hydrophilic / lipophilic characteristics,the lipophilicity of film forming additives is also different.For example, two propylene glycol methyl ether (DPM) is higher hydrophilicity, lower lipophilicity than two propylene glycol butyl ether (DPnB).If the outer layer of the aqueous acrylic emulsion particles is a highly lipophilic phase, the addition of DPM not only affects the film formation, but also allows the excess DPM in water to affect the other properties of the water-based paint film. The other effect of phase structure on the formulation of aqueous coatings is the effect on the film quality of water-based paint film.The key to the quality of the film is in the mixing process of the aqueous acrylic emulsion particles,to allow the mixed phases to be intensively mixied and the separation of the phases to be separated.If different phases are required to participate in the fusion, you should choose a mixed film-forming aid to achieve the best results. Many domestic and foreign literatures on water-based acrylic emulsion polymerization, mentioned the core shell and other emulsion particles structure. Such as core shell, half months, multi-core, hollow, and strawberries and other structures have been reported. The description of these structures is helpful to understand the complexity of the structure of the aqueous acrylic emulsion, but the structure of the water-based acrylic emulsion is much more complicated. For example, only a single phase structure of the particles of the emulsion is not present, the particles in the practical aqueous acrylic emulsion are the distribution of various structures, possibly more core shells, possibly more strawberries, etc. Water-based acrylic emulsion manufacturers control the phase structure of the aqueous acrylic emulsion by the choice of monomer, addition order, surfactant Dosage. The phase structure of the aqueous acrylic emulsion is the technical secret of the emulsion manufacturer, and the information is usually not disclosed. However, supplier will provide its acrylic emulsion recommended additives and proportions . Usually different water-based acrylic emulsion will require different combinations of additives

1.Principal raw material A.Styrene:The primary reason for the introduction of the monomer into the polyacrylate emulsion is that it provides a high glass transition temperature (Tg),So as to improve the hardness of the film;The other reason is cost.The amount of Styrene in the packaging industry is large,is one of the most important downstream products in the oil industry,low price but vulnerable to macroeconomic.However,the introduction of styrene, in particular, its content is higher than the total monomer volume of more than 15%,will bring a lot of negative effects to water-based paint film. First, the styrene-containing polymer segments lack flexibility, performance of water-based paint film hard and not tough;Second,Styrene contains benzene ring, is the UV absorber, when the monomer content is high, the UV through the adjacent benzene ring will have a shear reaction of the polymer chain, so that the water-based paint film becomes brittle, gloss decreased , Life is reduced;The structure of styrene also determines that it has affinity to many organic solvents,  water-based paint film’s solvent resistance and other resins is significantly different. B.Acrylic monomer:There are many kinds of acrylate monomers, and the performance and price are very different.The most commonly used acrylate monomers is butyl acrylate in China,the lowest cost of monomer conversion,is a kind of monomer which is used by most emulsion manufacturers to form a cheap wall paint.Its function is to provide water paint film flexibility.As the acrylic polymer backbone does not contain the group other than the ester group, the main chain and ester side chain flexibility are good, so that the water-based paint film lack of hardness.Although this kind of polyacrylate emulsion is the choice of interior and exterior wall paint, But for the high hardness and toughness of wood paint, the performance is not enough. C. Methacrylate monomers:The performance of methyl acrylate monomer is better than acrylate monomers.Due to the methylation of the methacrylate polymer backbone, the activity of the main chain is limited and the backbone steel is reinforced,meanwhile the ester side chain provides flexibility,so that the methacrylate monomer has the best balance of hardness and toughness.Such as polymethyl methacrylate (methyl methacrylate) is commonly known as plexiglass; Because methacrylate monomer doesn’t contain benzene ring, compared to the styrene monomer in the anti-UV erosion, durability, and solvent resistance ,it has obvious advantages. In summary, water-based acrylic resin manufacturers have a lot of monomer to choose, not only can change its type, but also change the relative proportions and components.Water-based paint manufacturers in the choice of water-based acrylic emulsion, can not only consider the "pure acrylic" or "styrene acrylic " these empty concept vocabulary,should be based on the actual performance of waterborne acrylate resins and their formulations. Next...

The rubber pressure-sensitive adhesive in addition to the main components of rubber, while adding a thickening resin, plasticizers and so on. The rubber type pressure-sensitive adhesive is made of rubber elastomer, thickener, softener, antioxidant and other components dissolved in the preparation of solvent.In addition to resin, resin pressure-sensitive adhesive must also add to defoamer.Wetting agents and so on.  Among the resins, polyacrylate is currently the most widely used, it is generally used for sealing tape, labels, stickers and women's products. Silicone and other resin-based pressure-sensitive adhesive are composed of silicone resin and silicone rubber mixture of pressure-sensitive adhesive, with high temperature and anti-aging properties, is a very important special pressure-sensitive adhesive.

How to judge the quality of waterborne pressure sensitive adhesive？ Pressure-sensitive adhesive quality of good or bad, generally from the drying speed, viscosity, adhesive strength, solid content and PH value and other aspects to measure. 1, pressure-sensitive adhesive drying speed When buying pressure-sensitive adhesive, it is necessary to measure whether the drying speed matches the bonding process. The general manual bonding process is slow, requires a long initial dry time; Machine bonding process is very fast, requiring short initial drying time. For the initial dry time, the vast majority of cases require the sooner the better, so as soon as possible into the next road process. 2, the viscosity of pressure-sensitive adhesive Viscosity is the most important factor affecting the quality of adhesives. If the viscosity is too large, the coating is thick, consumption of plastic large, slow drying, but also affect the adhesive on the surface of the sticky material wetting and infiltration, and thus directly affect the adhesive strength; if the viscosity is too small, The coating is thin, too fast drying, prone to poor adhesion and other issues. 3, the adhesive strength of pressure-sensitive adhesive Pressure-sensitive adhesive must have sufficient adhesive strength to ensure the normal use of the object after bonding. You can ripped two sticky materials along the adhesive interface, to determine whether the adhesive strength is qualified. If it is found that the material is damaged after tearing, it is proved that the adhesive strength is sufficient. If only the adhesive interface is separated, it indicates that the strength is insufficient. 4, the pressure-sensitive adhesive solid content Solid content is also one of the important factors affecting the quality of pressure-sensitive adhesive. If the pressure-sensitive adhesive content is higher, then it has less water, the stronger the adhesion, the faster the drying speed. General pressure-sensitive adhesive content of 55% ± 1. 5. The pH of the pressure sensitive adhesive Synthetic resin adhesive mostly weak acid, the bonding process will not have a negative impact. But the water glass and starch adhesives alkaline high alkaline high will not only on the operating personnel and equipment corrosion, and sometimes corrosion of sticky objects, the formation of the appearance of the mark. Therefore,  the purchase of adhesives to consider the impact of pH on the product.