Classification and characteristics of screen-printable pressure sensitive adhesives

Ⅱ Classification of screen-printable pressure sensitive adhesives

Because of the simple screen printing equipment, convenient operation, simple printing, plate making and low cost, for the application of coating pressure sensitive adhesive, also often consider the use of screen printing process to coating.The commonly used screen-printing pressure sensitive adhesives on the market can be divided into:

Water-based pressure sensitive adhesive: Currently the more common water-based screen printing pressure sensitive adhesive is represented by 3M company SP-7533, SP-7533 has higher peel strength and better high temperature resistance, and occupies an important position in the market.This product is based on acrylic emulsion as the main body, solid content of 65%, viscosity of 35000cps, mainly used in various industrial label applications.

Solvent-based screen printing pressure sensitive adhesive: Although the heat curing solvent-based screen printing pressure sensitive adhesive has a higher balance of peeling strength and shear strength than water-based pressure sensitive adhesive, and the water resistance and silkscreen operation are better than water-based screen printing pressure sensitive adhesive, due to the requirements of environmental protection in various countries, the restriction of VOC emission is more and more strict, and the solvent is harmful to the body of the operator. Currently, solvent - based pressure - sensitive adhesives are rarely used in screen printing.UV curing type screen printing pressure sensitive adhesive: As a concept that contains neither water nor organic solvents, UV solidified pressure-sensitive adhesive is environmentally friendly. Over the years, many world-renowned chemical companies, such as BASF, Hankel and 3M, have invested more research and development efforts to develop UV solidified pressure-sensitive adhesive. Universities and other scientific research institutes have also invested in a large number of basic researches. At present, the more mature application is mainly UV curing hot melt pressure sensitive adhesive, such as used in the printing of trademark labels. As a UV curing pressure sensitive adhesive suitable for screen printing, it needs to maintain a state suitable for printing at room temperature, so it needs lower viscosity, requiring the addition of a large number of UV monomers as active diluent in the formula.Generally, it is difficult to obtain both high peel strength and high shear strength in a short UV curing time, thus limiting the application of UV pressure sensitive adhesive in high performance industrial tapes. High performance UV pressure sensitive adhesive, should have high peel strength and high shear strength, and can meet the requirements of low UV energy and fast curing, and has good water resistance, temperature resistance and weather resistance and other physical properties. EcoPSA-1125 as a UV pressure sensitive adhesive suitable for screen printing has the following basic properties: viscosity 6500 CP@25 ℃; Solid content 100%; Peeling strength 20N/25mm (SUS304,30 min); Static high temperature hanging weight > 10000 min(SUS304,70℃,1kg/in2).

Sinograce Chemical produces all kinds of water-based adhesive and glue raw materials.welcome to consult.