PVC plastisols for applying protective coatings
PVC plastisols are dispersions of polyvinyl chloride (PVC) in a liquid plasticizer. Depending on the purpose plastisols may contain various additives (stabilizers, fillers, dyes, flame retardants, etc.), which give them special properties.
In the normal state, PVC plastisols are liquids or pastes of varying degrees of viscosity, which allows them to be easily processed by various methods: dipping, pouring into molds, rotational molding, extrusion, spraying, screen printing and spredding.
When heated, the solubility of PVC in the plasticizer increases dramatically, and at 140-180 ° C, the process of gelatinization occurs. The result is a rubber-like plastic with good physical and mechanical properties, high electrical resistance and chemical resistance.
Plastisols are widely used in various areas of industry: for anti-corrosion and anti-noise coating on the underside of cars and sealing welds, in the manufacture of oil and air filters, in the production of floor coverings, wallpaper, artificial leather, for coatings on fabrics and glass fabrics, in the manufacture of medical tools, electrical insulation, fire hoses and reinforced hoses, for the manufacture of toys, shoes, clothing, etc.
The amount of plasticizer in plastisol, depending on its purpose, can vary from 30 to 80%.
We have developed technologies for producing inexpensive PVC plastisols for the application of protective coatings using T-92 flotation reagent-oxal as a plasticizer in a specific way.
Plastisol PM (Technical Specifications 2241-002-97963455-2008)
Plastisol PM is designed for applying protective coatings on working gloves and mittens.
Table 1 - Plastisol Indicators according to Technical Specifications 2241-002-97963455-2008
Indicator |
Rule |
1. Appearance |
Uniform pasty mass without foreign inclusions. Color - on request |
Relative viscosity at (25±0.5)0С by viscometer ВЗ-246 (nozzle with a diameter of 6 mm), s, within |
40 – 350 |
The gelatinization time of plastisol at 180 ± 20С, min, not more |
1 |
The appearance of the sample obtained from plastisol |
Smooth film, without shells and blisters |
According to the data of the toxicological examination, Plastisol PM belongs to low-hazard substances of the 4th hazard class (when administered through the gastrointestinal tract), has a mild irritant effect on the mucous membranes of the eyes during a single contact and on intact skin during repeated applications, does not have a noticeable skin-resorptive and sensitizing effect.
NG-1M Plastisol (Technical Specifications 2241-003-64123846-2012)
NG-1M nonflammable plastisol was developed specifically for the production of composite mine mesh (grade “SS”) designed for tightening the sides and roof of underground workings at coal, metal ores and minerals extraction sites.
NG-1M plastisol is the only offer on the market with a confirmed category of "hard-burning". Completely excludes the appearance of a spark.
Table 2 - NG-1M Plastisol Indicators according to Technical Specifications 2241-003-64123846-2012
Indicator |
Rule |
Properties of PVC Paste |
|
1. Appearance |
Uniform pasty mass without foreign inclusions and clots of white color. |
2. Relative viscosity at (25±0.5) 0 С by viscometer ВЗ-246 (nozzle with a diameter of 6 mm), s |
40 – 200 |
Properties of gelled film |
|
3. Appearance |
Smooth, white, free from defects in the form of wrinkles and pock marks, without oil traces of plasticizer on the surface |
4. Tensile strength, MPa, not less |
4,0 |
5. Relative elongation at break,%, not less |
150 |
Fire and intrinsically safe characteristics of gelled film |
|
6. Specific surface electrical resistance, Ohm, not more |
3х108 |
7. Auto-ignition temperature, ° С, not less |
490 |
8. Maximum temperature increment, ° С, not more |
60 |
9. Burning time after removal from the burner flame, s, not more: - one sample - six sampes (in total) |
2 6 |