Propylparaben CAS 94-13-3
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- Appearance: White powder
- Assay: 99. 0%min
- Stock: In stock
- Sample: Available
- Zhishang Chemical: Propylparaben Supplement
Propylparaben: The Complete Guide
Index of Propylparaben Contents
Propylparaben for Sale
Basic Info of Propylparaben
n-propylparaben;propylparaben (99+%);propyl 4-hydroxybenzoate;hydroxybenzoate Phenylpropyl Ester; Propyl Parahydroxybenzoate
Food additives; Pharmaceutical raw materials; Cosmetic raw materials
What is Propylparaben?
Propylparaben, a colorless crystal or white crystal powder, is odorless and has extremely low toxicity. It has antibacterial effects on mold and yeast, and is used as a preservative in food, cosmetics and medicine. Due to its extremely low toxicity, it is easily hydrolyzed in the human body, and its antibacterial effect can be used in the range of pH 1-8, which overcomes the shortcoming of general preservatives only used under acidic conditions, and is widely used. Propylparaben is also the main intermediate for the synthesis of linear benzoate liquid crystals with superior performance.
Because of its extremely low toxicity and easy to be hydrolyzed in the human body, it is one of the preservatives that China focuses on developing to replace sodium benzoate. The traditional preparation method is that under the catalysis of concentrated sulfuric acid, p-hydroxybenzoic acid and propanol are refluxed and esterified at a certain temperature to prepare. The method seriously corrodes equipment, pollutes the environment, and has many side reactions and low yield. Therefore, a lot of research has been done on its synthesis. In recent years, preparation methods such as solid superacid, heteropolyacid, microwave radiation, calcium oxide as dehydrating agent and ionic liquid catalysis have been developed successively. However, most of them have shortcomings such as low yield, complicated operation, and expensive catalyst, which cannot be used for large-scale industrial production.
- Propylparaben is used as a preservative and antioxidant and is also used in the pharmaceutical industry.
- Propylparaben is used as a bacteriostatic preservative in pharmaceuticals and cosmetics.
- See Ethylparaben (17007) Uses Preservatives; Antimicrobials.
- Propylparaben is used as an antiseptic bactericide for food, cosmetics, pharmaceuticals, etc.
- Properties White crystals with special smell. Propyl p-carboxybenzoate is colorless fine crystals or white crystalline powder, almost odorless and slightly astringent.
- A p-hydroxybenzoate derivative. It can be prepared by reacting p-hydroxybenzoic acid with n-propanol in the presence of an acidic ionic liquid. It crystallizes in the monoclinic space group P21/c. It has been reported to be an endocrine disrupting compound.
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Application of Propylparaben
Prepared by the following raw materials by weight: food-grade sodium percarbonate, 65-75 parts; edible soda ash, 5-10 parts; food-grade baking soda, 8-12 parts; also including food-grade ethyl paraben and Food grade propylparaben is 0.4~0.6 parts in total, and the weight ratio of ethylparaben and food grade propylparaben is 3~5:1.
The aerobic cleaning agent provided by the present invention is prepared from food-grade raw materials, has high safety, and can be used for food utensil cleaning, denture cleaning, oxygenation and oxygen generation, antiseptic preservation, sterilization and descaling, etc. The aerobic cleaning agent provided by the present invention provides It is stable in nature and can ensure that sodium percarbonate will not decompose within 36 months.
A composition for preventing and treating rice blast and a preparation method thereof, comprising the following raw materials in parts by weight: rotenone, 15-25 parts; apiolide, 10-20 parts; ethanol, 120-140 parts; water, 440-480 parts The synergist propylparaben and sodium glycinate are 7-9 parts in total, and the weight ratio of propylparaben and sodium glycinate is 6-8:1.
The composition provided by the invention can prevent and treat rice blast, and can be developed into a pesticide for preventing and controlling rice blast. When the weight ratio of sodium is 6~8:1, the control effect is the best.
Salt-corrosion-resistant cable insulating rubber for marine tidal wind power and its manufacturing method, the cable insulating rubber is prepared from the following raw materials in parts by weight: EPDM rubber, 50-60 parts; cis-butadiene rubber, 10-20 parts; polysulfide Rubber, 5~15 parts; Alkylphenol ethoxylate, 4~6 parts; Pentaerythritol tetralaurate, 6~10 parts; Tolutriazole, 2~4 parts; Sodium hexametaphosphate, 1 ~3 parts; polydimethylsiloxane, 1~3 parts; triallyl isocyanurate, 2~4 parts; 2-mercaptobenzimidazole, 0.8~1.2 parts; ethylparaben and Propylparaben contains 3-5 parts in total, and the weight ratio of ethylparaben to propylparaben is 2-4:1.
The cable insulating rubber provided by the invention has excellent resistance to salt corrosion, which may be related to the ratio by weight of ethylparaben and propylparaben in the raw material, and the weight of ethylparaben and propylparaben The ratio is 2~4:1, and the cable made has the best salt corrosion resistance, especially suitable for use in marine tidal power plants.
A waterproof and flame-retardant sealing coating and a preparation method thereof. The sealing coating is prepared from the following raw materials in parts by weight: water, 70-90 parts; ethyl acrylate, 50-70 parts; titanium dioxide, 15-25 parts; bentonite, 20~40 parts; calcium carbonate, 10~20 parts; talc, 15~25 parts; DA type dispersant, 5~7 parts; film-forming aid, 3~5 parts; defoamer, 1~2 parts; Methylparaben and propylparaben have a total of 2 to 4 parts, and the ratio of the weight parts of the methylparaben to propylparaben is 1 to 3:1.
The sealing coating provided by the invention not only has high flame retardancy, but also has good corrosion resistance, is not easy to peel off, and can produce a lasting waterproof sealing effect. The technical effect of the coating of the present invention may be related to the ratio of the weight parts of methylparaben and propylparaben in the raw material, and the ratio of the weight parts of methylparaben to propylparaben is 1~3:1 When the waterproof and flame retardant sealing performance is the best.
A fire-resistant and high-temperature resistant cable material and a preparation method thereof are prepared from the following raw materials in parts by weight: nitrile rubber, 35-45 parts; polyvinyl chloride resin, 85-95 parts; antioxidant NBC, 10-20 parts; Plasticizer dioctyl sebacate, 6~8 parts; Reinforcing agent carbon black, 6~10 parts; Zinc stearate, 3~5 parts; Magnesium stearate, 2~4 parts; Aluminum isopropoxide , 5 to 15 parts; tricresyl phosphate and propyl paraben total 7 to 9 parts, and the ratio of the parts by weight of tricresyl phosphate to propyl paraben is 6 to 8:1.
The cable material provided by the invention has excellent fire resistance and high temperature resistance, which may be related to the ratio of the weight parts of tricresyl phosphate and propylparaben in the raw material, and the ratio of the weight parts of tricresyl phosphate to propylparaben is: When the ratio is 6 to 8:1, the fire resistance and high temperature resistance are the best.
A composition for controlling rice planthopper and a preparation method thereof, comprising the following raw materials in parts by weight: chlorazophos, 15-25 parts; solanilin, 10-20 parts; ethanol, 120-140 parts; water, 440-20 parts 480 parts; a total of 7-9 parts of synergist propylparaben and magnesium sulfate, and the weight ratio of propylparaben and magnesium sulfate is 6-8:1.
The composition provided by the invention can prevent and control rice planthopper, and can be developed into a pesticide for preventing and controlling rice planthopper. When the weight ratio of magnesium sulfate is 6~8:1, the control effect is the best.
Preparation of Propylparaben
- Put the silica gel into a drying box, dry it at 150°C for 4 hours, cool it to room temperature, then immerse the silica gel in a perchloric acid solution, soak it for 14 hours, filter it with suction, dry it, and seal it for later use;
- Add p-hydroxybenzoic acid, n-propanol and the catalyst prepared above in turn to the flask equipped with thermometer, stirrer, water separator and reflux condenser, stir and heat to 85℃-90℃, and react for 3h;
- After the reaction is completed, filter out the catalyst while hot, steam excess propanol from the filtrate, cool, wash the precipitated solid, filter with suction, and dry to obtain crude ester, which is purified to obtain white propylparaben.
The preparation method of propyl paraben has the beneficial effects of using perchloric acid-silica gel as a catalyst, high catalytic activity, simple operation, no corrosion to equipment, low price, non-toxic, no pollution to the environment, and is suitable for industrialization Production.