Wetting and dispersing additive DISPERBYK-2096 is suitable for general purpose pigment pastes, especially for architectural coatings.
It is a processing aid for improving the coloring power of general purpose pigment pastes in non-polar coating systems, and is also used as a wetting and dispersing agent for non-polar coatings.
Chemical composition: mixture of polar acidic ester and high molecular weight alcohol
Additive dosage: 1 – 3 % titanium dioxide
5 – 15 % inorganic pigments
10 – 20 % organic pigments
A free radical without other side reactions; another advantage is that it is relatively stable and can be stored safely in a pure state, but it also decomposes sharply at 80~90℃; the disadvantage is that it has a certain degree of toxicity and a low decomposition rate, which is a low activity initiator. The isobutyronitrile (dimethylcyano-methyl) radical formed after the decomposition of A IBN is a low melting point polyethylene wax carbon radical and lacks dehydrogenation ability, so it cannot be used as an initiator for graft polymerization.
It can be seen from Table 4-7 that the decomposition temperature of azo compounds is related to the structure and the presence or absence of polar substituents in the hydrocarbyl group. Alkyl azo compounds have lower activity (E=167.4~209.2kJ/mol), at high temperatures (>100℃). ), there is a significant decomposition rate, and the azo compounds with cyano groups in the alkyl have higher activity, especially those with cyano groups on both sides of the azo have higher activity (Ea=104.6~146.4kJ/mol ), decomposes quickly above 50℃. If the hydrocarbyl group is an aryl group and has a polar group, its activity will be higher (Es=83.7~104.6kJ/mol). The larger the volume of the hydrocarbyl group attached to the azo group, the higher its activity. For example, the t1/2=10h of tert-butylazoisobutyronitrile is 79℃, and the methyl group of the isobutyronitrile group is substituted by an ethyl group. Reduce to 70°C.
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