47results about How to "Excellent thermal and oxidative aging resistance" patented technology

The invention discloses application of epoxy cardanol as a bio-based hindered phenolic antioxidant. The epoxy cardanol as the bio-based hindered phenolic antioxidant is prepared by comprising the following steps: with cardanol as a raw material, under the action of a catalyst, dropwise adding a peroxy source and carrying out epoxidation reaction at 40 to 70 DEG C for 2 to 5 hours so as to prepare a crude epoxy cardanol, and carrying out aftertreatment so as to obtain an epoxy cardanol antioxidant. According to the invention, thermal oxidative aging resistance of the bio-based hindered phenolic antioxidant in the invention is superior to the thermal oxidative aging resistance of a general hindered phenolic antioxidant, i.e., 2,6-di-tert-butyl-4-methylphenol. Meanwhile, the bio-based hindered phenolic antioxidant has the advantages of wide raw material sources, low price, simple preparation process, low toxicity and environmental protection, can be extensively applied in vegetable oil and biodiesel, and has good application and development prospects.

The present invention relates to a glass fiber reinforcing polypropylene composite material of heat-resistant oxidation and ultraviolet resistance. The composition and ratio is: 34 percent to 84 percent of polypropylene, 5 percent to 15 percent of grafted polypropylene, 10 percent to 50 percent of glass fiber, 0.1 percent to 2 percent of heat stabilizer, 0.1 percent to 2 percent of composite antioxidant, and 0.1 percent to 1 percent of composite UV-resistant agent. The above percentages are all weight percentages. The present invention uses the highly efficient heat-resistant and stable system, and the prepared composite material has good heat-resistant, anti-oxidation and aging-resistant performances; each physical and mechanical performance of the material is excellent. At the same time, the cost is reduced.

The invention relates to the field of a polymer type anti-oxidant, and provides a polymer type anti-oxidant, a preparation method thereof, and an application thereof. According to the invention, under the effect of a catalyst dibutyltin dilaurate, hydroxyl-terminated polybutadiene and isophorone diisocyanate are subject to a reaction under a temperature of 30 to 50 DEG C, such that an adduct is synthesized; the adduct is subject to a reaction with a low-molecular bisphenol anti-oxidant under a temperature of 60 to 80 DEG C, such that the polymer type anti-oxidant is prepared. The thermal oxidative aging resistance of the polymer type anti-oxidant is better than that of the corresponding low-molecular bisphenol anti-oxidant. Also, the polymer type anti-oxidant has an excellent extraction resistance. The anti-oxidant can be widely applied in rubber materials.

The invention discloses a macromolecular hindered phenol antioxidant containing thioether and carbamate groups and a preparation method and application thereof. In the role of a tertiary amine catalyst, thiol-ene click reaction of a bisphenol mono acrylate compound and functional thiol containing hydroxyl is performed at 30-50DEG C to prepare a hindered phenol intermediate containing alcoholic hydroxyl and thioether groups; under the action of a dibutyltin dilaurate catalyst, the hindered phenol intermediate containing alcoholic hydroxyl and thioether groups is reacted with an organic diisocyanate compound at 50-70 DEG C to prepare the macromolecular hindered phenol antioxidant containing the thioether and carbamate groups. The macromolecular hindered phenol antioxidant has the characteristics of excellent anti heat and oxygen aging performance and high efficiency, and can be widely used in ageing prevention of rubber and other materials.

The invention discloses a star-type macromolecular hindered phenol antioxidant and a preparation method and an application thereof. The preparation method comprises the following steps: under the effect of catalyst dibutyltin dilaurate, carrying out reaction on an alcoholic hydroxyl group of a micromolecular antioxidant 3, 5'-di-tertiary butyl-4-methylol phenol and secondary isocyanato of isophorone diisocyanate at 20-40 DEG C to obtain an intermediate containing isocyanato in primary site; and carrying out reaction on the intermediate and primary hydroxyl in a beta-cyclodextrin derivative at 60-80 DEG C to prepare the star-type macromolecular hindered phenol antioxidant. The beta-cyclodextrin derivative has seven primary hydroxyls and 14 acetyls. The star-type macromolecular hindered phenol antioxidant has excellent thermal oxidative aging resistance and extraction resistance and can be widely applied to rubber materials.

The invention discloses a thermo-oxidative aging resistant regenerated polyethylene material as well as a preparation method and application thereof. The regenerated polyethylene material comprises the following components: regenerated high-density polyethylene, regenerated low-density polyethylene, carbon black master batch, a compatilizer, a first lubricant and composite antioxidant master batch, wherein the melt index of the regenerated high-density polyethylene is 0.2-0.6 g/10min, and the melt index of the regenerated low-density polyethylene is 1.0-2.0 g/10min; the crystallization temperature of the regenerated low-density polyethylene is 80-105 DEG C, and the peak value of the crystallization temperature is less than or equal to 95 DEG C; and the composite antioxidant master batch comprises the following components: polyethylene, an antioxidant, a metal deactivator, a nucleating agent and a second lubricant. Through the synergistic effect of the regenerated high-density polyethylene, the regenerated low-density polyethylene, the composite antioxidant master batch and other components, the prepared regenerated polyethylene material has excellent thermo-oxidative aging resistance, and the change rate of the elongation at break and the change rate of the tensile strength after thermo-oxidative aging at 110 DEG C are both smaller than or equal to 5%.

The invention relates to a preparing method for antioxidant-modified carbon nano tube/hydrogenated butadiene-acrylonitrile rubber. The preparing method comprises the steps that firstly, a hindered phenol antioxidant is grafted to the surfaces of carbon nano tubes through a solid phase reaction from the angle of the molecular structure, then the antioxidant-modified carbon nano tube filler, hydrogenated butadiene-acrylonitrile rubber, a vulcanizing agent, an activating agent and a co-vulcanizing agent are mixed and vulcanized, and the product is obtained. The hydrogenated butadiene-acrylonitrile rubber prepared with the method has excellent mechanical properties, high-temperature resistance and hot oxygen aging resistance; besides, the antioxidant is not prone to self-aggregation and not likely to be separated from the rubber material, and thus the rubber product can have more stable performance; furthermore, no organic solvent is adopted, and environment friendliness of the preparing process is achieved.

The invention relates to an HDPE pipe material and a preparing method thereof. A formula of the HDPE pipe material contains hindered phenol quaternary ammonium salt modified imvite, the mass of which is 1-10% of the total mass of all components of the HDPE pipe material. The invention further provides a preparing method of the HDPE pipe material. The HDPE pipe material has excellent processing stability and thermal resistance stability, durable weather resistance and well color.

The invention belongs to the technical field of high polymer materials, and particularly relates to a thermo-oxidative-aging-resistant polypropylene composite and a preparation method thereof. The thermo-oxidative-aging-resistant polypropylene composite comprises the following substrate components in percentage by weight: 52-99.4% of polypropylene resin, 0-30% of filler, 0-15% of elastomer, 0.2-1% of composite main antioxidant, 0.2-1% of auxiliary antioxidant and 0.2-1% of processing assistant. By using the composition of hindered phenol and semi-hindered phenol as the main antioxidant, one of the two ortho-positions of the phenolic hydroxyl group on the benzene ring in the molecule of the semi-hindered phenol antioxidant is substituted by the tert-butyl group, and the other is substituted by the methyl group, so the steric hindrance is greatly reduced as compared with the hindered phenol antioxidant, thereby obviously enhancing the free radical trapping efficiency; and thus, the main antioxidant can ensure the material to have favorable thermo-oxidative aging resistance, and can eliminate the free radicals generated in the extreme working process, thereby ensuring the thermo-oxidative-aging resistance of the final polypropylene part.

The invention relates to a thermosetting vinyl organic silicon resin composition. The resin composition comprises: vinyl organic silicon resin which comprises any one or a combination of at least twoof linear vinyl organic silicon resin, circular vinyl organic silicon resin and three-dimensional random network structure MQ vinyl organic silicon resin; vinyl modified polyphenyl ether resin; a radical initiator; the invention further provides a high-frequency circuit substrate prepared by adopting the resin composition and application of the high-frequency circuit substrate. The high-frequencycircuit substrate provided by the invention is low in dielectric constant, low in dielectric loss and low in water absorption; the interlayer adhesion of the high-frequency circuit substrate can meetrequirements of the interlayer adhesion between copper-clad plates; the halogen-free and phosphorus-free V-0 level of flame retardance can be realized.

The invention discloses a preparation method of anti-ultraviolet polyester-cotton fabric. The method comprises the following steps that gray fabric is subjected to oil removal treatment, dyed and pad-rolled in an anti-ultraviolet finishing agent to obtain the anti-ultraviolet polyester-cotton fabric; the gray fabric is prepared from, by weight, 60-70 parts of polyester fibers, 30-34 parts of cotton fibers, 3-5 parts of bamboo fibers and 2-4 parts of polyacrylonitrile fibers. According to the preparation method, the bamboo fibers are added to polyester-cotton fibers, so that the oil stain adsorption defect of the fabric is overcome, and the air permeability, moisture absorption and sweat releasing performance and dyeing performance and the anti-bacterium, mite-removal and anti-ultraviolet functions of the polyester-cotton fabric are improved; by adding the polyacrylonitrile fibers, the softness, chromophilous performance, anti-ultraviolet performance and anti-bacterium and mothproof performance of the fabric are improved; through compatibility with the anti-ultraviolet finishing agent, all components of the anti-ultraviolet finishing agent cooperate for promotion, the prepared anti-ultraviolet polyester-cotton fabric has the moisture absorption and sweat releasing performance, anti-bacterium performance and anti-ultraviolet performance, and the wearing comfort is improved.

The invention discloses a halogen-free and flame-retarding enhanced PBT (Polybutylene Terephthalate) composite material. The halogen-free and flame-retarding enhanced PBT composite material is prepared from the following raw material components in parts by weight: 40 to 50 parts of PBT resin, 8 to 12 parts of anti-warping resin, 20 to 30 parts of a flame retardant, 25 to 35 parts of a filling agent, 3 to 5 parts of a compatilizer and 0.4 to 0.8 part of an antioxidant, wherein the intrinsic viscosity of the PBT resin is 0.83dl/g to 0.86dl/g; the content of a copper element and the content of a titanium element in a resin matrix satisfy the following formula: Cu is greater than or equal to 50ppm and less than or equal to Ti, and Ti is greater than or equal to Cu and is less than or equal to 200ppm. According to the halogen-free and flame-retarding enhanced PBT composite material, factors including the intrinsic viscosity, the content of trace impurities and the like of the resin are systematically evaluated so as to ensure that the composite material has excellent thin-wall processing property and anti-ageing performance; aiming at component proportioning and optimization of the flame retardant and the antioxidant, specific compounding of a halogen-free and flame-retarding system and specific compounding of an antioxidant system are further limited, so that the PBT composite material has an excellent thermal-oxidative ageing resisting property.

The invention discloses a preparation method of a bamboo-based polycaprolactone composite sheet material modified by nano-silica and nano-titanium dioxide. The preparation method comprises the following steps: polycaprolactone is mixed with modified bamboo powders, hydrophobically modified bamboo fibers, modified nano-silica and a silica immobilized antioxidant in a double-roll plasticator, and the mixture is subjected to compression molding on a hot press with a set hot pressing temperature and a set hot pressing pressure; and the surface of the bamboo material is subjected to pulling film forming using titanium dioxide sol by a dipping-pulling method, and then an anti-bacterial and mildew-resistant modified bamboo material is obtained after a heat treatment of the pulled bamboo material.Silica is modified in toluene solvent using a silane coupling agent KH570 to enhance hydrophobicity and lipophilicity, and dispersibility of the modified silica in the bamboo material is excellent, so that impact-resistance and aging-resistance of the bamboo material are substantially improved. The surface of the bamboo material is subjected to pulling film forming using titanium dioxide sol by adipping-pulling method, so that nano-titanium dioxide modification of the bamboo material is achieved, and after the high temperature treatment, the titanium dioxide modified bamboo material is strong in anti-bacterial and mildew-resistant properties and low in cost.

The invention discloses a chitosan-based multifunctional macromolecular rubber anti-aging agent, and a preparation method and application thereof. The chitosan-based multifunctional macromolecular rubber anti-aging agent is prepared by carrying out chemical reaction on active amino groups on chitosan and a carboxyl-containing phenolic anti-aging agent in the presence of a solvent, a dehydrating agent and a catalyst. The chitosan-based multifunctional macromolecular rubber anti-aging agent provided by the invention is environment-friendly and not easy to migrate, not only can remarkably improve the thermo-oxidative aging resistance of a rubber material, but also has excellent extraction resistance, can play a lasting thermo-oxidative aging resistance role on the rubber material, can also promote rubber vulcanization and remarkably reduce the positive vulcanization time TC90, and reduces the consumption of a vulcanization accelerator.

The invention discloses a macromolecular antioxidant. The macromolecular antioxidant is characterized by comprising a functional group 2-allyl-6-methyl-6-tert-butylphenol. The macromolecular antioxidant is prepared through copolymerization of 2-allyl-6-methyl-6-tert-butylphenol and ethylenediamine. The polymer has good resistance to heat-oxygen aging, and can be used not only as a heat-oxygen aging-resistant modifier for PVC, ABS and other ordinary plastics but also as a heat-oxygen aging-resistant modifier for polyethylene, PA6, PPO and other engineering plastics, and the effect is good.