Для успешного проведения малярных работ Equally important are such aids as solvents, the use of which is necessary for the preparation of painted surfaces and imparting the desired consistency to paintwork materials. In this article we will look at solvent P4, which is one of the most popular and well-known materials on the market.
Растворитель Р4 – органический растворитель, It is a clear, colorless liquid (in some cases it may have a yellowish tint) without visible suspended particles. It is characterized by a specific smell and high volatility. The average value of the relative density of a substance is 0.85 g per cubic meter. see. Self-ignites at a temperature of 550 degrees. It is made according to standards which are provided by state standard specification 7827-74. Available in industrial packaging - plastic and glass containers (bottles) of various sizes.
P4 is a mixture of three organic solvents that, in combination, become even more effective. Includes the following substances:
• toluene - 62%;
• acetone - 26%;
• butyl acetate - 12%.
Due to this composition the solventIt is characterized by fairly good consumer properties and high dissolution efficacy of varnishes and paints. An ingredient such as butyl acetate helps to increase the gloss of the films of applied paintwork materials and prevents their whitening and fading.
Solvent P4 (GOST 7827-74) has the following characteristics:
• values of the indicator of volatility on ethyl ether are in the range from 5 to 15;
• the number of coagulation is at least 24%;
• the proportion of water (by weight) is equal to no more than 0.7%;
• acid number does not exceed 0.07 mg KOH / g.
Выпускается также растворитель марки Р-4А.This reagent and solvent P4 - analogues of the technical characteristics. However, they differ somewhat in composition, since, according to the requirements of GOST, butylacetate is not included in P-4A. Another difference between these grades is that the solvent grade R-4A, unlike P4, is capable of dissolving XB-124 enamels (protective and gray).
Reagent is used for breeding.paints and varnishes such as PSC LN and LS PSC, the basis for the manufacture of which are polyvinyl chloride chlorinated resins, epoxy resins, copolymers of vinyl chloride and some other film-forming substances.
Solvent P4 is added to a specific material (varnish or paint) in small portions until the desired consistency is achieved. Dilute paint (varnish) is required to constantly mix.
After applying the prepared coatingthe solvent evaporates, and the film-forming substance, hardening, turns into a protective coating. It is important when working with a solvent to prevent water from entering it, since the acetone in the mixture can easily mix with it, and this in turn will lead to color distortion or whitening of the transparent coating.
It should be remembered that the substance belongs toto toxicants and can have a negative effect on the human body, which enters by inhalation, and also penetrates the skin. With long-term exposure, a negative effect of the solvent on the bone marrow and blood is possible. In case of prolonged contact with skin, dermatitis may form.
Considering all the above, working withSolvent P4 should be carried out in rooms provided with good ventilation. It is also extremely important to use protective equipment to prevent exposure of the harmful substances to the respiratory organs, eyes and skin of the hands (respirator, gloves, goggles).
P4, like a number of other solvents,characterized by a high degree of fire danger. The mixture is highly flammable and, in addition, is explosive. Vapors of solvents that have a tendency to accumulate are also explosive. Therefore, a prerequisite when working with a solvent is compliance with fire safety requirements.
