Organic antimicrobial finishes can be divided into two categories, namely, soluble and non-soluble. Dissolving type antimicrobial finishes are not chemically bonded to the fabric, so they can be carried away by contact with water, and they are mainly used on disposable textiles (disposable textiles).
Non-dissolving antimicrobial finishes are chemically bonded to fabrics, and the fabrics treated with these finishes are durable for wear and repeated washing.
The titanate coupling agent can chemically react on the surface of pigments and fillers to form a monomolecular layer and play a bridge role for each molecule. Therefore, the dosage is small and the effect is large. In order to make a small amount of titanate coupling agent evenly distributed on the surface of pigments and fillers, it is necessary to adopt effective methods to give full play to its due effects.
According to the structure type of the coupling agent, water resistance, actual use object and use occasion, different methods are adopted. The methods of using various types of titanate coupling agents are introduced as follows.
How to use monoalkoxy coupling agent
In addition to two types of monoalkoxy titanate coupling agents, which contain triethanolamine groups (both monoalkoxy and chelate) and pyrophosphate groups, most of them ebs wax dispersion have poor water resistance and can only be dissolved and coated in organic solvents. Covering pigments, fillers, or directly used in solvent-based coatings, can be divided into pigment and filler pretreatment methods and direct addition methods. Pigment and filler pretreatment methods The method of pre-coating on the surface of pigments and fillers. Although it is more troublesome to increase the operating procedures, this method must be used when the polymer components are more complex or the processing temperature is relatively high, in order to prevent some unnecessary side reactions from occurring.
The operation method is generally as follows: first dissolve the monoalkoxy titanate coupling agent in a small amount of toluene, xylene and other hydrocarbon solvents, then stir and mix with pigments and fillers at room temperature, increase the temperature appropriately, and continue stirring at about 90°C Mix for more than half an hour to ensure that the titanate coupling agent and the surface of the pigment and filler are coupled. If there is no condition for heating, the coupling can also be carried out at room temperature, but the reaction is relatively slow. It is best to stir at room temperature for 2 hours, and it is better to use it after standing overnight. Generally speaking, a large amount of solvent has a good coating effect on pigments and fillers, but the excess solvent must be removed, which will increase the process and cost in actual production. According to a report by Ken rich company Monte et al. 8], it is very important for the titanate coupling agent to be diluted with a solvent. It can make the titanate coupling agent evenly distributed on the surface of the pigment and filler, even if the amount of solvent is as small as the titanate When the dosage ratio is 1:1, it also has a very obvious dispersion effect. In actual production, according to the specific situation, adding diluent can achieve the goal of uniform distribution.
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