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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: Discussion on chemical toxicity of various components in latex paint

    Coating knowledge: Discussion on chemical toxicity of various components in latex paint

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: with the improvement of people's living standards, people's awareness of environmental protection and safety and health has been gradually enhanced, and people are increasingly concerned about the safety of interior and exterior wall coatings, As the most widely used latex paint for interior decoration, is there any toxicity? If so, which components are toxic and how toxic? The so-called chemical toxicity refers to the ability of a certain amount of chemicals to cause damage to human body

    It can be considered that as long as all the chemicals reach a certain dose, they will damage the human body; on the contrary, if there is not a certain amount, that is, less than the dose that causes damage to the human body, they will not damage the human body

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    The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings news: with the improvement of people's living standards, people's awareness of environmental protection and safety and health has gradually increased, and people are increasingly concerned about the safety of interior and exterior wall coatings, As the most widely used latex paint for interior decoration, is there any toxicity? If so, which components are toxic and how toxic? The so-called chemical toxicity refers to the ability of a certain amount of chemicals to cause damage to human body

    It can be considered that as long as all the chemicals reach a certain dose, they will damage the human body; on the contrary, if there is not a certain amount, that is, less than the dose that causes damage to the human body, they will not damage the human body

    Therefore, when considering the toxic effect of chemical substances on human body, in addition to the chemical toxicity of chemical substances themselves, it is also necessary to make clear the dose of their contact with human body, and consider the way and time distribution of their contact with the body

    Composition analysis we know that latex knee is composed of base material (also known as film-forming material, adhesive, etc.), pigment (filler), various additives and water, etc

    We will discuss these components one by one

    1, the base materials used in base latex paint are pure acrylate emulsion, benzene acrylic emulsion paint, vinegar acrylic emulsion, polyvinyl acetate emulsion, etc

    Acrylate polymer itself is non-toxic, and several countries, such as the U.S

    Food and Drug Administration (FDA), expressly allow it to be used in food packaging

    Although the monomer and emulsifier in emulsion polymerization have certain toxicity, the emulsion polymer will contain a small amount of free monomer

    The production and two processing of emulsion polymer may involve some safety and environmental problems

    However, after emulsion forming the paint film, these free monomers and emulsifiers will volatilize, and ultimately the paint will not harm human body

    Polyvinyl acetate polymer is odorless, tasteless and nontoxic

    Polyvinyl acetate resin produced by solution polymerization or suspension polymerization can replace natural resin as the base material of chewing gum

    According to FDA regulations, polyvinyl acetate copolymers can also be used in food packaging

    Several other commonly used emulsions are also non-toxic

    However, it should be pointed out that in the low-grade interior wall coating, some manufacturers use polyvinyl alcohol or polyvinyl acetal (formaldehyde or butyraldehyde) as the base material, and the synthesis of polyvinyl acetaldehyde uses the aldol condensation reaction in organic chemistry, which is neither quantitative nor instantaneous

    Moreover, polyvinyl alcohol is a macromolecular alcohol substance, and the reaction conversion rate is unlikely to be high Therefore, there must be a certain amount of formaldehyde in polyvinyl formal

    The formaldehyde toxic carcinogen has a strong stimulating effect on the skin and mucous membrane

    When the concentration is 5ppm, it will cause coughing and chest tightness

    Long term contact may cause mild eye, nose and throat irritation symptoms, dry skin, softening of nail, etc., so the paint produced with its base material is harmful to human body

    Of course, the coatings produced with them as base materials do not belong to the category of latex paint

    2

    Pigments commonly used in pigment (filler) emulsion paint include coloring pigments and physical pigments

    Commonly used coloring pigments include titanium dioxide, lithopone, iron oxide red, sun resistant yellow G, phthalocyanine blue B, pigment carbon black, etc

    Titanium dioxide is the most important white pigment, which is widely used in many industries, such as cosmetics, paper making and ceramics, etc

    in addition to coating

    The color paste is generally used for color matching of emulsion paint, and the responsible emulsion paint manufacturers generally use environmental friendly color paste, which is non-toxic and harmless to human body

    Common physical pigments are light calcium carbonate with high purity, which can be used in toothpaste and other edible products

    Heavy carbonic acid, talcum powder, mica powder, barite powder, kaolin, wollastonite powder are all crushed by the corresponding natural ore; these inorganic minerals are non-toxic and generally do not contain substances harmful to human body

    3

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