Solid acrylic resins are widely used in the formulation of water-based printing inks. Common water-based printing ink formulations are usually composed of acrylate copolymer emulsion, solid acrylic resin, pigment filler and wetting agent, defoamer, etc. Acrylate copolymer emulsion is the main bonding material, and solid acrylic resin is the pigment dispersant, also known as dispersion resin. Aqueous solid acrylic resin is also called alkali-soluble acrylic resin, the main property indicators are molecular weight (Mw) and its distribution (PDI), Acid value (Acid value) and glass transition temperature (Tg). When the glass transition temperature is higher, the resin has higher hardness, gloss and weather resistance, but can not form a continuous film. When the glass transition temperature is low, the film forming is soft and easy to adhere. The solid acrylic resin used in water-based printing ink is mostly alkali-soluble resin, because the composition contains about 30% of acrylic acid or methacrylic acid, in the case of alkali dissolution, and immediately converted into emulsifying, wetting and dispersing functions of macromolecular surfactants, for a variety of substrates with low polarity, such as PE film, PP film and aluminum plating film have good adhesion fastness. Therefore, solid acrylic resin is an important material in the preparation process of water-based ink, which is not only used in the preparation process of emulsion binder, but also in the preparation process of ink. Water-based solid acrylic resin is also an excellent pigment dispersion bonding material, it provides dispersion for a variety of difficult to disperse pigments, improve color development and film formation.

(1) The use of hydrosol Hydrosol is a polymeric dispersion of very small particles, which has the characteristics of both emulsion system and solution system, and can effectively improve water resistance (2) Reduce the amount of emulsifier Although emulsifier plays an important role in the formation of micelles in polymerization and the stability of the polymerization emulsion, it is also an important reason for the decline of water resistance and adhesion. Using special emulsifiers or reducing the amount of emulsifiers can help to improve the water resistance of the emulsion. 1. Improve the bonding strength of acrylic emulsion (1) Adhesive resin The 180° peeling strength and initial adhesion of the pressure-sensitive adhesive can be significantly improved with the addition of tackifier resin. There are two ways to join. First, blending, using this method to increase the viscosity of the resin must meet three basic requirements: A. Its molecular weight must be lower than the molecular weight of the adhesive polymer; B. The glass transition temperature of the tackifying resin must be higher than that of the polymer. C. The compatibility of the tackifier resin with the adhesive polymer to be added is better. Second, before the emulsion polymerization, the tackifying resin is dissolved in the acrylate monomer in advance, and then the emulsion polymerization can also prepare the adhesive with good comprehensive properties. (2) Select different polymerization methods If using core-shell polymerization. The core of the polymer uses a harder monomer such as styrene, acrylonitrile, methacrylate, etc., while the shell of the polymer uses a softer alkyl acrylate monomer, so that the polymer emulsion with this structure can greatly improve the cohesion strength of the adhesive.Special monomer, such as copolymerization of acrylic monomer with appropriate amount of isononyl acrylate (Tg=82℃), can further improve its comprehensive properties. In order to improve the bonding of alkane materials, vinyl benzoate, tetrahydrofurfuryl methacrylate, cyclohexyl acrylate, 2-phenoxyethyl acrylate and other monomers can be copolymerized with alkyl acrylate to improve the wettability of non-polar bonded bodies and effectively improve the bonding force.

Water-based viscosification emulsion plays a very important role in water-based acrylic pressure sensitive adhesive, which can improve the adhesion strength and initial viscosity of pressure sensitive adhesive on high and low energy surface, so as to achieve the best balance point, and improve the application range and grade of pressure sensitive products. Today, I will introduce you to the application of water-based viscosification emulsion in water-based pressure sensitive adhesive. The tackifier emulsion plays a very important role in the pressure sensitive adhesive, and it can promote the improvement of the peel strength and the initial viscosity of the adhesive. According to different adhesive polymers, different viscosifying emulsions should be selected. Aqueous rosin tackifier emulsion is a rosin modified emulsion dispersion with 50% high solid content, 100% solvent free and APE free. With a very narrow particle size distribution and a small average particle size, it is used to improve the bonding properties of water-based pressure-sensitive adhesives/adhesives. And has excellent low bubble property, storage and mechanical stability. It has excellent compatibility with acrylic acid, SBR, NR and other common polymers. Water-based adhesive emulsion is used for pressure sensitive adhesive, paper adhesive, industrial tape, laminating adhesive and other water-based adhesive. New product recommendation WPS series water-based viscosifier emulsion I.Overview rosin ester tackifier resins series of products is a kind of high solid content emulsion made from modified rosin polyester and polymer surfactant by special homogenization process. The product and its preparation process do not use any organic solvent, and it is a green water-based tackifier. Due to the use of polymer emulsifier, it has a significant viscosification effect and wide compatibility, and can be widely used in various water-based adhesives for viscosification or thickening. II.Feature 1.Unique polymer surfactant, making the product tackiness effect is remarkable, good compatibility, wide compatibility, suitable for many varieties. 2.Special emulsification process, narrow particle size distribution, stable quality, long storage period. 3.Rosin modified polyester is suitable for a wide range of PH values and can be used in near-neutral or weakly alkaline conditions. 4.Low surface tension, small foam, uniform coating. 5.After addition, the initial viscosity, adhesion and stripping strength can be significantly improved, and the best balance point can be reached. 6.The preparation uses water as solvent, does not contain any organic solvent, green environmental protection. III.Compatibility 1.Acrylic resin (Acrgeic) : mutual capacity 2.Styrene-butadiene rubber (SBR) : mutual capacitance 3.Neoprene rubber (CR) : mutual capacity 4.Vinyl acetate copolymer (EVA) : mutual capacity 5.TPR (SIS, SBS, SEBS) : mutual tolerance 6.Nitrile-butadiene rubber (NBR) : mutual capacitance 7.Natural rubbe...

As for the performance difference between water-based acrylic acid and water-based polyurethane, it can be briefly analyzed from the following aspects: 1.Chemical structure: Waterborne acrylic resin is mainly composed of acrylic monomer, while waterborne polyurethane resin is composed of isocyanate monomer and polyether or polyester polymer. 2.Performance characteristics: Water-based acrylic resins are favored for their fast drying speed, high transparency, good flexibility and good gloss. It is often used in the manufacture of paints, coatings and packaging materials. Waterborne polyurethane resins are known for their high tensile elasticity, scratch resistance and chemical resistance. It is widely used in coatings, flooring and adhesives. In summary, water-based ink coating has been applied in many industries because of its wide applicability and good performance characteristics. The differences in chemical structure and performance characteristics of water-based acrylic acid and water-based polyurethane make them show unique advantages in specific application scenarios. For more detailed information, you can contact Sinograce Chemical to inquire about waterborne polyurethanes and waterborne acrylic