Textile antimicrobial agents can be divided into natural, organic and inorganic three categories. Each type of antimicrobial agent has its own advantages and disadvantages, organic antimicrobial agent effect, a variety of antimicrobial agent is currently the most widely used class of antimicrobial agent, but there are problems such as poor stability of high temperature resistance, it is difficult to use in synthetic fiber spinning process.
Natural antimicrobial agents usually have good safety, but its application is narrow, most seriously affect the color and light of the fabric.
Inorganic antimicrobial agents have good heat resistance, but it is difficult to obtain durable results for textile finishing, and there is the problem of heavy metal toxicity.
Polybutyl titanate is a kind of titanate polycondensate that is widely used abroad. The brands are British TIL COMP BT, CaH, O[Ti(OC, H,) 2O], Cq Hg(n~4~7 ), because of the high content of Ti and O in polybutyl titanate, it is more stable to oxidation and high temperature, and can be used as a base material for heat-resistant paint. Polybutyl titanate has better film-forming properties than butyl titanate monomer.
It is used as a base material for heat-resistant coatings. It has a more comprehensive performance, improves the hardness and adhesion of the paint film, and has better integrity. And stretchability. It is an excellent surface treatment agent for metal powder for making metal powder paint. The heat-resistant coating made of PBT and aluminum powder or zinc powder has good anti-corrosion performance under normal temperature and high humidity environment. It is also a curing accelerator and modifier for polyester wire enamel, which can reduce the baking temperature of the paint film, increase the adhesion of the paint film to the metal, make the surface of the paint film smooth, and improve the solvent resistance and aging resistance of the paint film. , Wear resistance and mechanical strength, etc. PBT is also used as a curing accelerator for silicone resin blackfire montan wax paint to reduce the curing temperature of silicone paint. Adding a very small amount of PBT to some coatings can act as an anti-oxidant, inhibit the skinning of the coating and the wrinkling of the paint film, improve the durability of the paint film, reduce the tendency of chalking, and improve the gloss retention and pigment wetting sex.
Dosage and method of use of titanate coupling agent
The amount of titanate used is to make all the isopropoxy groups in the titanate coupling agent molecule react with the hydroxyl groups or protons provided by the pigment and filler, and excess is not necessary. According to some empirical laws reported by Monte et al., they are summarized as follows:
① In the case of high loading, inorganic pigments and fillers with a particle size of 2.5 pm and a relative density of 2.7 generally need to use 0.4% of its mass of titanium coupling agent;
② In the case of low loading, use 0.25% of the mass of organic resin or 0.5% of the mass of inorganic pigments and fillers, whichever is larger;
③Used in unfilled resin, generally 0.25% of the resin mass;
④ For coarse particles with small surface area, such as glass fiber and other fillers, use 0.1% of the mass of inorganic substances;
⑤Fine particle carbon black and some silicas, use 0.5%~1.5% of its mass;
⑥The most suitable dosage can be used to determine the relationship between viscosity and titanate dosage by viscosity measurement.
High melting point polymers usually use low molecular weight liquids such as mineral oil for model tests. The amount of titanate used is 0.0, 0.25%, 0.5%, 1.0%, 2.0% and 3.0% of the filler mass for the test, and the viscosity drops the most. , Is the most suitable amount of titanate. The approximate dosage of titanate coupling agent is about 0.1% to 3% of the mass of pigment and filler. The finer the particle size of pigments and fillers and the larger the surface area, the more titanate coupling agent is used.
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