The effect of gas volume expansion on air velocity after gas combustion

Under stable operation, gas volume expansion has little effect on air velocity, because generally speaking, the content of VOCs is not high, and the volume flow rate increase is very small for just this part of gas expansion.

Metal soaps used as slip and anti-blocking agents in coatings are mainly metal salts of stearic acid, i.e. zinc stearate, aluminum stearate, calcium stearate, and magnesium stearate and stearic acid. Lead fatty acid is used less.
In some thermoplastic volatile coatings and latex paints, the coating film has the disadvantages of pressure tack and hot tack. In addition to adjustments in the coating formulation design, the selection of appropriate resins, pigments and fillers also requires the use of the above-mentioned slip and anti-stick properties. Scratch agent, increase the smoothness of the coating film, and achieve the purpose of anti-adhesion. To choose more homopolymer waxes, the use of polyethylene wax and polytetrafluoroethylene wax can obtain a good anti-blocking effect. In addition, metal soaps can also be used as anti-blocking agents.

Zinc stearate, aluminum stearate, calcium stearate and other metal soaps and coatings, so it is inconvenient to use. Special attention should be paid to the use of the above stearates, in addition to the anti-blocking effect of the coating film, there is also a significant matting effect, which greatly reduces the gloss of the coating film, so the use is restricted.

Introduction to non-blocking polymers
Nowadays, many coating applications require the smallest coefficient of friction to obtain many non-stick effects, such as non-stick cooking product coatings, pressure-sensitive adhesive (band) back coatings, non-toxic pollution-free coatings for underwater ship bottoms, ice release coatings and protection Fabric and leather anti-pollution, dirt-free coatings, etc., require the coating film to have as small a friction coefficient as possible. The above-mentioned slip agents can be used in corresponding applications. For example, according to the introduction of Deqian, Taiwan, the heat-resistant temperature of 435 modified polysiloxane produced by the company can reach 250°C, which can be used in coating formulations for heat-resistant non-stick kitchenware.

For some coatings that require final lubricity as the primary function, it is not enough to add slip agents to achieve the required non-blocking property, or it cannot meet the needs at all. In this case, the non-blocking property must come from The coating base material is the polymer itself, so that after the coating is internal lubricant usa cured into a film, the polymer base material can also provide non-blocking properties. However, many polymers that provide non-blocking and low surface energy, such as polyolefins and fluoropolymers, are insoluble in solvents commonly used in coatings, and do not have the mechanical properties required for practical use. It is difficult to combine viscous paints.