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Jun 1, 2016
Silicone oils generally used arepolydimethylsiloxanes and poly (methylphenyl) siloxanes. Paint, ink is appliedpolydimethylsiloxane. PMPS although compatibility is good, but do not have theability to control the surface state, so basically not used in the levelingagent, used for high temperature aspect.
Polydimethylsiloxane
Although with good surface state control,but there are many shortcomings, poor compatibility, it will affect the coatinggloss, also often appear between shrinkage, layer adhesion problems.Polydimethyl siloxanes different molecular weight, the compatibility and usesare different. Organic modified polydimethylsiloxane silicone oil compared withobvious advantages, not only retains the advantages of silicone, and with itwas modified to overcome its shortcomings, has played a lot of special effectsfeatures. The properties and uses modified silicone, the key is the molecularweight of the silicone, category type, and location of the modifying compoundin the molecule, a modified approach are many.
Alkyl-modified organosiloxane
Mentioned polyether-modified silicone somedeficiencies; alkyl modified silicone just have advantages in these areas.
This series of silicone products alsobelong to the comb structure. The molecular weight of these products isrelatively small, about 10000, n + m is about 30-50. The main purpose of usingalkyl modified in order to improve thermal stability, compatibility andunstable foam, and even anti-foaming function. But with the growth of modifiedalkyl chain, its ability to reduce surface tension drops.
Relations alkyl chain length and surfacetension:
Modified alkyl chain | —CH3 | —CH2—CH3 | —(CH2)9CH3 |
Surface Tension/(mN/m) | 20.6 | 26.2 | 31.4 |
Usually carbon chain control betweenC1-C14, the molecular weight is not.
The above describes polydimethylsiloxane threemodification methods, different modification method, the amount and structureof different modifiers, and performance of their products are different, threedifferent methods for producing modified leveling agent, its heat resistance isdifferent. 1060 silicone-modified silicone friction can Chemical has good heatresistance, the use of heat-resistant temperature within a temperature range of200-220 ℃.