Rubber protective wax is composed of paraffin wax, microcrystalline wax and various auxiliaries processing. Due to its good carbon distribution and thus unique migration characteristics, it is a rubber physical antioxidant with a wide range of relative molecular mass distribution and good anti-aging properties.
A rubber protective wax, according to the weight percentage includes: fully refined paraffin wax 20 ~ 40%, semi-refined paraffin wax 25 ~ 45%, microcrystalline wax 20 ~ 53%, ethylene – vinyl acetate copolymer EVA 0.5 ~ 5%.
Specific examples of implementation are as follows
1, a rubber protective wax, the components contained therein and the weight percentage of each component are: 22.0% of fully refined paraffin wax, 26.0% of semi-refined paraffin wax, 51.0% of microcrystalline wax, and 1.0% of EVA copolymer.
2, wherein said fully refined paraffin wax is 62# fully refined petroleum wax, with a melting point of 63.80C and n-alkane content of 65.5%; said semi-refined paraffin wax is 58# semi-refined petroleum wax, with a melting point of 60.50C and n-alkane content of 72.8%; said microcrystalline wax is 75# microcrystalline wax, with a melting point of 74.50C and n-alkane content of 45.7%.
3. Put the weighed fully refined paraffin wax and semi-refined paraffin wax into the reaction kettle, slowly raise the temperature to 1350C, melt all the materials and stir at 50 rpm for 45 minutes, then add the microcrystalline wax and EVA polymer, stir for 60 minutes and pass through the filter after all the materials are melted, filter out the impurities and then cool down, and granulate through the molding machine to make rubber protective wax.
Ozone in the air of Chemicalbook is an isomer of oxygen, which has a very strong oxidizing ability. Most rubber molecules contain unsaturated double bonds. When exposed to atmospheric ozone, both statically and dynamically, the double bonds are broken and cracking occurs. The rubber protective wax is added to the rubber during the preparation, and when the amount exceeds the solubility in the rubber, it migrates to the surface of the rubber products after vulcanization, causing frosting, forming an inert flexible protective film with strong adhesion on the surface of the rubber products, covering the surface of the rubber, which can play a barrier role of keeping the rubber out of contact with the odorous gas, thus preventing the products from cracking due to ozone attack.
Protection of various types of rubber.
The carbon number and content of n-alkanes and non-n-alkanes in rubber protective waxes were determined by high-temperature gas chromatography. The optimum conditions for the determination of gas chromatography were as follows: column initial temperature 80℃, column final temperature 350℃, ramp rate 8℃min-1, injection volume 1μL, and vaporization chamber temperature 3℃ above the column temperature. The column was used to analyze the carbon number distribution of n-alkanes and non-n-alkanes of rubber protective waxes with carbon numbers up to 60 using a large-bore capillary column with low loss and a combination of current integration and peak-valley-peak integration. The results were consistent with the results of the urea complex method and the method was reproducible.
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