semisynthetic microemulsion

  • Taxonomy:Metal processing

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  • Date of release:2019/06/01
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Semisynthetic microemulsion

Product application:

It is mainly used in metal processing such as car, grinding, milling, drilling, spot facing, insertion, cutting, stamping drawing, calendering, wire drawing, forging, die pressing, cutting and grinding.

Product features:

1. This product adopts unique formula, containing a variety of additives, non-toxic, tasteless;

2. Excellent lubrication, rust prevention, extreme pressure and good stability;

3. Easy emulsification and dilution, small emulsion particle factor, micro emulsion cooling and cleaning effect is good, in the case of mechanical factors have been fixed, to ensure processing accuracy and smoothness, can effectively improve the service life of the tool, the equipment has an excellent protection.

Polymer microemulsion can be prepared by microemulsion polymerization of monomer. There are two kinds of polymer microemulsion: one is O/W type normal microemulsion, the other is W/O type reverse microemulsion. High emulsifier concentration (even higher than monomer concentration) is required to prepare O/W emulsion, and additional emulsifier is needed. In comparison, W/O microemulsions are easier to prepare in reverse than in positive phase because the monomer can be partially distributed on the oil-water phase interface to act as an emulsifier.

The characteristics of microemulsion polymerization are: 1. Large dosage of emulsifier and co-emulsifier. Such as the microemulsion formulation is typical of styrene, styrene (S) is 4.85% (quality, similarly hereinafter), sodium dodecyl sulfate (SDS) 9.05%, 1 - amyl alcohol (auxiliary emulsifier) is 3.85%, water 82.5%, KPS was 0.27%, emulsifier dosage 2 times more than monomer to form more monomer beads drop 10-100 nm in diameter of microemulsion (equivalent to the size of the conventional emulsion micelles 40-50 nm). 2. Fast polymerization rate and high conversion rate. The sites of initiation of polymerization are mainly monomer microbeads with large surface area that capture free radicals in the aqueous phase and initiate monomer polymerization to nucleate. The mean free base n in latex granules was <0.5, and n showed a decreasing trend with the progress of the reaction, indicating that the monomer in the free radical-free monomer microdroplets continuously diffused into the continuous phase, and then diffused into the latex granules from the continuous phase, to supplement the monomer consumed by the growing polymerization chain. Due to the large number of monomer microbeads, the conversion rate of monomer microbeads into latex particles is quite fast, so the conversion rate can reach more than 90% in a short time once the polymerization starts. 3. The number of latex particles increases with the increase of monomer conversion rate (the monomer conversion rate increases from 1% to 90%, and the number of latex particles increases from 0.4×10 /ml to 4.7×10 /ml); The diameter distribution of latex particles gradually widened (the conversion rate increased from 2% to 77%, and the diameter of latex particles widened from 8-34nm to 6-55nm), and the growth chain terminated not from the double base, but from the monomer transfer, resulting in the molecular weight of polymer still maintaining the characteristics of high molecular weight of traditional emulsion polymerization. 4. Due to the low concentration of monomer in the formula, phase separation or polymerization of polymer particles can easily occur when monomer concentration is increased, so O/W type polymer microemulsion with high solid content cannot be synthesized.

The importance of polymer microemulsion lies in the fact that latex particles are nano-sized particles. Due to the small particle size and large specific surface area, it is used in coating, adhesive, dipping agent, ink and other fields. When it is applied to the processing and coating of wood, stone, concrete, paper or metal parts, it is easy to penetrate into very fine patterns and pores and obtain high gloss, smoothness, transparency and strength. Adding styrene-butadiene latex can greatly improve the bond strength. PMA reverse phase microemulsion is a fluid material which is easier to be applied and has better plugging effect (reducing oil permeability) than PMA aqueous solution and PMA dry powder.

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last:fine grinding fluid

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