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• Time of issue:2022-02-24
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(Summary description)PE agricultural film is widely used in agricultural production. Therefore, the problem of its anti-fogging becomes more important. By adding the surfactants described below to the PE material formulation system, a very obvious anti-fogging effect can be obtained. The dosage of the additive is 0.05% to 2.5%, and its hlb value (hydrophilic-lipophilic balance value) is between 4 and 14, and each molecule is required to contain 2 to 10 eo groups (oxyethylene groups) and an aliphatic derivative. group. Commonly used polyglycol monostearate (eo=9), polyglycol monolaurate (eo=9), polyoxyethylene lauryl ether (eo=4), polyoxyethylene soybean oil amide (eo=2), polyoxyethylene sorbitan monostearate (eo=4), polyoxyethylene sorbitan monolaurate (eo=4), polyoxyethylene sorbitan monocaprylate ( eo=5) and so on.

Experiments have found that the combination of two surfactants is better than using one alone, and it can produce a synergistic effect. The commonly used methods are ethylene oxide derivatives of high-carbon fatty alcohols, ethylene oxide derivatives of alkylphenols, ethylene oxide derivatives of high-carbon fatty acids, ethylene oxide derivatives of fatty acid esters of glycerol or sorbitol, etc. In the surfactant, the phosphate of triethanolamine is added, and the result of synergistic effect is to greatly improve the anti-fogging performance of plastic packaging materials. After using the composite anti-fogging agent in the experiment, the surface wettability of the polyethylene film is good, and the contact angle can be reduced to about 20°. For example, the mixed additives of lauryl ether (eo=10) and triethanol ether (eo=10) of polyethylene oxide and phosphate of triethanolamine can greatly extend the validity period of anti-fogging of plastic films.