56results about How to "Prolonged oxidation induction period" patented technology

The present invention relates to one kind of biodiesel oil modifier and its preparation process. The biodiesel oil modifier is compounded with antioxidant 1-10 weight portions, antioxidant synergist 0-5 weight portions, biodiesel oil of rape seed oil 50-100 weight portions, and low temperature flow improver 5-50 weight portions. The biodiesel oil modifier can raise the stability of biodiesel oil and improve its low temperature flow performance effectively, and has convenient use, wide adaptability, long storage period, capacity of being used in low temperature and low cost.

The invention relates to a refrigerator oil composition, which comprises polyol ester, (3,5-dialkyl-4-hydroxyphenyl) carboxylic thiophenyl alkyl ester, an antiwear agent, a metal passivator and an acid catching agent, wherein the polyol ester is pentaerythritol tetranitrate generated by reacting pentaerythritol with a mixture of isononanoic acid and diethyl caproic acid. The refrigerator oil composition provided by the invention has excellent oxidation stability. Compared with that of the refrigerator oil using the conventional antioxidant, the oxidative induction time of the refrigerator oil composition is obviously prolonged.

The invention provides a preparation method of an emulsion antioxidant product and belongs to the technical field of preparation of synthetic material antioxidant products. The emulsion antioxidant product is used for acrylonitrile butadiene styrene acrylonitrile butadiene styrene (ABS) grafting powder by means of an emulsion polymerization technology. Phenolic antioxygen Wingstay-L, an active ion radical trapping agent and a methylene di-sulfo ester compound are compounded according to the proportion to form a complex antioxidant, the complex antioxidant, isotridecyl alcohol polyoxyethylene ether or nonyl phenol polyoxyethylene ether and a dilution dispersing agent are mixed and stirred through a high speed shearing machine at the heating condition of 80-120 DEG C to form a homogeneous mixed liquid, and quantitative deionized water and an anionic surface active agent are added to continue to perform high speed shearing and stirring so as to obtain the antioxidant product having a water-soluble particle emulsion state, namely the emulsion antioxidant product.

The invention relates to a refrigerating machine oil composition, comprising polyol ester, semi-hindered phenol type antioxidant, antiwear agent, metal deactivator and acid catcher; wherein the polyol ester is ester product of reaction of pentaerythritol with mixture of isononanoic acid and diethyl hexanoic acid. The refrigerating machine oil composition provided by the invention has good oxidation stability, and oxidation induction period thereof is obviously prolonged compared with the refrigerating machine oil utilizing conventional antioxidant.

The invention discloses a high-density polyethylene compound additive and a preparation method thereof, and belongs to the field of chemical engineering. The compound additive comprises an antioxidant, a nucleating agent, an acid acceptor and an antistatic agent, wherein the antioxidant comprises an antioxidant 330, an antioxidant 168 and an antioxidant 1076. The preparation method of the compound additive comprises the following steps: mixing the raw components, and uniformly stirring; granulating the uniformly mixed components so as to obtain granules; and sieving the obtained granules. The compound additive has the advantages that the 5000S-oxidation induction time can be prolonged to above 50 minutes through the synergistic effect among the additives, the yellow index is reduced, the fracture strain is improved, and the like.

The invention discloses lubricant base oil and a preparation method thereof. The preparation method comprises the following steps: mixing silicone oil with a solid catalyst, stirring and heating to a reaction temperature, adding acetic acid vinyl ester to perform reaction, stopping reaction when an iodine value is smaller than 3.0g/100g, separating the catalyst out and then performing reduced pressure distillation on obtained liquid to obtain the lubricant base oil. The preparation method of the lubricant base oil disclosed by the invention has simple technology, lower cost, low equipment requirement, no acid wastewater generation in a preparation process and no pollution to environment; the utilized platinum solid catalyst has higher catalyzing performance; the lubricant base oil synthesized by the acetic acid vinyl ester and the silicone oil has low pour point, high flash point, good viscosity-temperature property, good oxidation stability and excellent friction lubricating property.

The invention provides a modified lignin carbon dot and a preparation method and application thereof, and relates to the technical field of nano materials. According to the preparation method of the modified lignin carbon dot, a lignin-based carbon source, water and a silane coupling agent are subjected to a hydrothermal reaction, and the modified lignin carbon dot is obtained; or hydrothermal reaction is performed on the lignin-based carbon source and water to obtain the lignin carbon dot, and hydrothermal reaction is performed on the lignin carbon dot, water and a silane coupling agent to obtain the modified lignin carbon dot. The silane coupling agent is utilized to modify the lignin carbon dot so that the dispersity of the lignin carbon dot is improved, the lignin carbon dot has multifunctionality, the high temperature resistance, oxidation resistance and scratch resistance of the composite material can be improved, and the friction coefficient of the composite material is reduced. Results of the embodiment show that when the modified lignin carbon dot is added into polypropylene, the degradation temperature of the composite material is increased by 20 DEG C, the oxidation induction period is 4.65 min, the friction coefficient is reduced to 0.164, and the scratch resistance is good.

A processing method of oxidation-resisting sesame oil is disclosed. The method includes a step of soaking sesame in an enzyme solution, washing and peeling the sesame, drying the sesame and then performing microwave treatment to obtain pretreated sesame; a step of adding the pretreated sesame into a hydraulic oil press, and squeezing the sesame to obtain crude oil; a step of air drying honeysucklebud and flower, pomegranate rind, eucommia bark, Chinese star anise and fruits of pyracantha fortuneana, then crushing the honeysuckle bud and flower, the pomegranate rind, the eucommia bark, the Chinese star anise and the fruits of pyracantha fortuneana, adding ethanol into the crushed material, and performing ultrasonic extraction, filtration, concentration, drying and elution to obtain a plantextract product; a step of adding the plant extract product, loach polysaccharides, apple polyphenol, lotus oligomeric proanthocyanidins, oryzanol, phytic acid and vitamin C into the crude oil, fullystirring the mixture, decolorizing the mixture, allowing the mixture to stand, and filtering the mixture to obtain decolorized sesame oil; and a step of cooling the decolorized sesame oil to 0-7 DEGC, adding diatomite into the sesame oil, fully stirring the mixture, allowing the mixture to stand, and filtering the mixture. The method is simple in process, prone to industrial application and highin oil yield. The obtained sesame oil is light in color, high in transparency, good in oxidation resistance and long in shelf life.

The invention discloses a polypropylene cable insulating material as well as a preparation method and application thereof. The polypropylene cable insulating material is prepared from, taking the massamount of the polypropylene cable insulating material as 100%, 99.5 to 99.9% of a polypropylene matrix and 0.1 to 0.5% of thio bisphenol compound filler. Wherein the thio bisphenol compound comprisesa hindered phenol unit and a sulfur-containing unit, the hindered phenol unit can capture free radicals generated in a matrix through proton transfer, and the sulfur-containing unit can efficiently decompose a hydroperoxide into a harmless product. The polypropylene cable insulating material with high thermal oxidation stability prepared by the invention has the characteristics of long oxidationinduction period, high direct-current breakdown strength, difficulty in accumulation of space charges and the like, and is suitable for high-voltage direct-current cables.

The invention discloses a preparation method for an injection molding grade high density polyethylene, and belongs to the field of special material preparation method of high density polyethylene. Reaction conditions are as following: using a Mitsui Chemicals high density polyethylene process unit, taking titanium trichloride and aluminum alkyl as catalysts, ethylene as a raw material, propylene as a comonomer, and hexane as a diluent; performing polymerization reaction in a polymerizing pot, at a temperature of 78 to 86 DEG C and under a pressure of 0.20 to 0.80 MPa; and ethylene flow quantity is 2 to 5 t/h, mole ratio of hydrogen/ethylene is 1.0 to 3.0m, and propylene flow quantity is 20 to 120 kg/h. The injection molding grade high density polyethylene of the invention possesses higher flow rate, small injection pressure, high rigidity, high surface glossiness, and long oxidation induction time. Processing and modeling are easy, distortion is difficult to happen, injection modeling is complete, weld-line strength is high, and defective index is low.

The invention provides a composite soap-based lubricating grease composition. The composition comprises base oil. The composition comprises the following components in parts by weight: 5-25 parts of athickening agent and 75 to 95 parts of the base oil, wherein the thickening agent is prepared by saponifying raw materials including 12-hydroxystearic acid, C6-C16 binary acid, lithium hydroxide anddivalent metal hydroxide, and a mass ratio of the lithium hydroxide to the divalent metal hydroxide is 1: 10 to 10: 1. The prepared lubricating grease has good water resistance, high temperature resistance, wear resistance and long oxidation induction period; in particular, the service life of the lubricating grease is 2-3 times the service life of common composite metal soap-based lubricating grease; and a low-temperature compounding process is adopted, so the lubricating grease has a high dropping point, greatly reduces working hours and energy consumption and has wide popularization value.

The invention relates to lubricating grease for a blast-furnace gun and a preparation method thereof. The lubricating grease is prepared from the following components in percentage by weight: 6-13.6% of densifier, 83-90% of base oil and 1-5% of additives, wherein the kinematic viscosity of the base oil at 40 DEG C is 120-200mm<2>/s, and the viscosity index of the base oil is not less than 92 and the condensation point of the base oil is not higher than minus 10 DEG C; the additives comprise (a) 0.5-2% of antioxidant, (b) 0.5-2% of antiwear agent and (c) 0-1% of antirust agent. The lubricating grease produced by the method has a good high-temperature dropping point, long oxidation induction time, low long wear value under a certain load and good anti-corrosion performance in the presence of moisture. The wear scar diameter of the lubricating grease verified by an SH/T0204 method is not greater than 0.5mm. The oxidation induction time of the lubricating grease tested by SH/T0790 is greater than 13 minutes at 210 DEG C. The comprehensive problems that the lubricating grease simultaneously satisfies high temperature resistance, long service life, wear resistance, rust prevention, centralized pumping and the like are solved.

The invention belongs to the technical field of synthetic resin production, and particularly relates to a special material for an irradiation-resistant sterilizing polypropylene spun-bonded non-woven fabric and a preparation method of the special material. The preparation method specifically comprises the following steps: (1) on-line mixing of basic polypropylene powder, peroxide and additives; (2) controllable rheological reaction in a barrel of an extruder; (3) extrusion pelletizing and centrifugal drying; and (4) air conveying, product homogenization, packaging and delivery. According to the invention, a one-time hot working process is utilized, direct contact with oxygen in the processes of mixing and preparation is avoided, reduction in mechanical performance and optical performance caused by the hot working process is reduced, additional addition of an elastomer for toughening is not needed, and production cost is low. The produced special material provided by the invention can provide protection for polymer degradation induced by high-energy rays, and is long in oxidation induction period and not prone to discoloring.

The invention discloses a novel coloring masterbatch for cold hot water plastic pipe fittings, and belongs to the technical field of plastic additives. The coloring masterbatch for the cold hot waterplastic pipe fittings is characterized by including the following raw materials in percentages by weight: 25-55% of linear low-density polyethylene, 0-30% of linear polyethylene, 0-50% of carbon black, 0.5-2.5% of an antioxidant, 0.5-2% of a functional auxiliary agent, 0-36% of titanium dioxide, 0-8% of phthalocyanine blue, 0-4% of zinc iron yellow, and 0-0.001% of permanent violet. The coloring masterbatch provided by the invention is used for coloring of PP pipes and PPR pipes, and the prepared pipe fittings have the advantages of a long oxidation induction period and good weather resistance, and can meet the requirements of new standards, thereby promoting the sustainable development of the industry.

The invention relates to an additive composition for improving the performance of lubricant, and a preparation method and application method thereof. The preparation method comprises the following steps: performing hydroxylation reaction for C60 fullerene to obtain C60(OH)8-15 or C60(OH)24-26, then catalytically esterifying the hydroxyl by virtue of short chain carboxylic acid C1-5COOH to obtain an esterification product C60(OOC-R)8-15 or 24-26 which is adopted as a component A, wherein the additive composition also comprises an ester dissolving agent and an antioxidant synergistic agent, andthe weight ratio of the three components, i.e., a weight ratio of component A to ester dissolving agent to antioxidant synergistic agent is (0.1 to 10): (2 to 20): (10 to 40). The additive compositiondoes not comprise water, sulfur, phosphorus, chlorine and mechanical impurities and is environment-friendly; and the additive composition has good wear resistance and friction reduction performance:the friction coefficient of the lubricating oil is decreased by 18.8 percent to 34.3 percent, an average grinding spot diameter is reduced to 0.49, and the oxidation induction period is increased by one time or more in the existence of the high-temperature high-pressure oxygen. After the lubricating grease is added, when the device is in an idle state, the input current can be decreased by 16.3 to20.3 percent.