Background and overview[1]
Ethylene glycol distearate is an important additive in the cosmetics industry. It can be used as a pearlescent agent, conditioner and thickener in shampoos, bath soaps and other washing products. It is synthesized by the esterification of ethylene glycol and stearic acid. The reaction temperature of the traditional synthesis process is high, generally between (150~210°C). In order to remove the water produced by the reaction, measures such as nitrogen flow, reduced pressure or azeotropic dehydration are required. Due to the high reaction temperature, the product is severely carbonized and has a deep color, requiring an additional decolorization process. Some studies have used p-toluenesulfonic acid and phosphorous acid (molar ratio 1:1) as a composite catalyst (hereinafter referred to as composite catalyst) for esterification reaction, and conducted experimental research on the three factors of catalyst dosage, reaction temperature, and reaction time, and it is given A new synthesis process for ethylene glycol distearate was developed.
Apply[2-5]
Ethylene glycol distearate is an excellent pearlescent agent for cosmetics and an important additive in the cosmetics industry. Examples of its applications are as follows:
1) Prepare an aloe vera soap, which belongs to the field of daily chemicals. Including the following raw materials: amino acid surfactant, natural aloe juice, cocamidopropyl hydroxysulfobetaine, ethylene glycol distearate, kason, silicone oil, titanium dioxide, each component and its content (in Weight fraction) are: amino acid surfactant: 25%-50%; cocamidopropyl hydroxysulfobetaine: 5%-20%; ethylene glycol distearate: 2%-10%; Casson 10%-20%, silicone oil 2%-8%, titanium dioxide; 0.5%-5%; the rest is water. The preparation steps of this process are simple. The soap produced uses amino acid surfactant as the main cleaning ingredient, silicone oil and Casson as disinfecting ingredients, and adds beneficial ingredients such as aloe vera plant essence. It has skin care and beauty features, strong decontamination ability, and excellent disinfection effect. The effect is small, irritating, and has no side effects.
2) Prepare an insecticidal and sterilizing lotion, which consists of acrylic styrene cross-linked polymer, potassium monoalkyl phosphate, cationic guar gum, emulsified silicone oil, potassium hydroxide, and ethylene glycol disulfide. Fatty acid ester, disodium ethylenediaminetetraacetate, benzophenone-4, Litsea cubeba essential oil, extract, hydrogenated castor oil and purified water are prepared. The steps are: dissolve acrylic styrene cross-linked polymer with purified water; Potassium monoalkyl phosphate, disodium ethylenediaminetetraacetate, benzophenone-4; add guar gum to purified water, ethylene glycol distearate and emulsified silicone oil to dissolve; dissolve Duhuo, Ligusticum chuanxiong, skullcap and reed root. After grinding, extract and concentrate; mix the solution with the extract; emulsify Litsea cubeba essential oil and hydrogenated castor oil; mix the mixture and emulsion, add purified water to obtain lotion. The invention has good insecticidal and sterilizing effect, simple process and can effectively treat acne, vaginitis and athlete’s foot on human skin caused by mites, fungi and mold.
3) Prepare an anti-rust lubricating oil. Lubricating oil is made of the following raw materials by weight: 100-120 parts of silicone oil, 50-60 parts of liquid paraffin, 2-6 parts of isoprene styrene copolymer, 11-16 parts of petroleum ether, 3 parts of potassium dihydrogen phosphate -7 parts, 1-4 parts of sodium citrate, 1-4 parts of zinc dialkyl dithiophosphate, 0.5-1.5 parts of graphite powder and 5-10 parts of anti-rust additive; the anti-rust additive is dodecyl A mixture of sodium benzenesulfonate, sodium petroleum sulfonate, zinc naphthenate and polyethylene glycol distearate. The anti-rust lubricating oil of the present invention has a reasonable formula. It uses silicone oil and liquid paraffin as base oil. The viscosity of the lubricating oil is increased by adding isoprene styrene copolymer and petroleum ether. Sodium dodecyl benzene sulfonate, petroleum sulfonate, etc. The mixture of sodium phosphate, zinc naphthenate and polyethylene glycol distearate has good anti-rust properties and can improve the anti-rust properties of the base oil.
4) Prepare a thermally conductive rubber with strong oil resistance, including the following raw materials in parts by weight: 2-8 parts by weight of carbon black, 30-50 parts by nitrile rubber, 20-40 parts by natural rubber, and 5-5 parts by weight of ethyl acetate. Preparation method of the present invention The method is simple, the raw materials for preparation are easily available, the cost is low, the product performance is stable, and the adaptability is strong. The thermally conductive rubber with strong oil resistance prepared by the invention can be made by adding ethylene glycol distearate and cyclohexanexanol phosphate. The oil resistance and thermal conductivity of this product are greatly improved, and the synergistic effect of ethylene glycol distearate and cyclohexanol phosphate ultimately greatly improves the oil resistance and thermal conductivity of this product.
Preparation[1]
Stearic acid and ethylene glycol form ethylene glycol distearate under the action of an acidic catalyst:
Add 1.74 mol of stearic acid into the three-necked flask, heat and melt, add 0.0435 mol of catalyst and 1 mol of ethylene glycol while stirring, then control a certain temperature and drain the generated water through the water separation device in time to prevent reverse reaction. .
Main reference materials
[1] Synthesis of ethylene glycol distearate with p-toluenesulfonic acid and phosphorous acid composite catalyst
[2] CN201210452754.1 Preparation method of aloe soap
[3] CN200410060829.7 Antibacterial and insecticidal lotion and preparation method
[4] CN201410632353.3 Anti-rust lubricating oil
[5] CN201811453686.4 A thermally conductive rubber with strong oil resistance and its preparation method
