Materials that can inhibit the growth of microorganisms to achieve anti-mildew and anti-bacterial purposes; at the same time, anti-mildew and anti-bacterial materials can effectively inhibit the corrosion of organic resins in the paint by mold, thus extending the service life of the paint.
The anti-mildew and anti-bacterial effect is relatively good, and the compatibility is good, which meets the requirements of anti-mildew and anti-bacterial architectural interior wall coatings.
Alcoholysis and transesterification
(i-CgH, O): Ti+X(R’OH) (i-C gHz O) -, Ti(ORO.+r-CH, OH
In the formula, R’is an aliphatic or aromatic alkane group, R’has more carbon atoms than isopropoxy, and the reaction can proceed; x is not more than 4.
The alcoholysis reaction can also be considered as an alcohol exchange reaction. Generally, an alcohol with a low carbon number is easily replaced by an alcohol with a high carbon number. (i-CgH, O) 4Ti+4CgHy, OH, (Cg HirO) Ti+4i-CaH, OH
This reaction can be carried out at room temperature. It is generally a reversible reaction. It is not easy to replace all the isopropoxy groups on the titanium atom. It is necessary to heat and reduce the pressure to continuously remove the replaced isopropanol, and all the isopropanol on the titanium atom The oxy group can be replaced.
Titanium tetraisopropoxide or titanium chelate containing bis-isopropoxy group such as titanium acetylacetonate chelate, (i-CsH; O): Ti[OC(CH:) -CHC OCH:] a through alcoholysis The reaction enables cross-linking of polymers containing hydroxyl groups. For example, polyvinyl alcohol or polyvinyl alcohol copolymer and water paraffin emulsion titanium tetraisopropoxide or titanium acetylacetonate chelate can be cross-linked at 20°C for 24 hours.
The hydroxyl groups in phenolic resins can undergo the same cross-linking reaction.
(i-CgH, O), Ti+4CH, COOCH, (CH yO), Ti+4CH, COO-C, H;
The alcohol exchange that occurs in two ester molecules is expressed as a transesterification reaction. The R group in the ester has more carbon atoms than the alkoxy carbon atoms in the titanium atom, and the reaction can proceed. If the ester with low boiling point can be continuously removed, all the isopropoxy groups on the titanium atom can be replaced Come down. Polyvinyl acetate can undergo a similar transesterification reaction with titanium tetraisopropoxide when heated.
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