31results about How to "Changed crystallization behavior" patented technology

The invention relates to a low-shrinkage and low-density modified polypropylene composite material and a preparation method thereof. The polypropylene composite material is prepared from the following raw materials in percentage by weight: 50 percent to 80 percent of polypropylene (PP), 5 percent to 40 percent of long fiber enhanced resin, 1 percent to 10 percent of a compatilizer, 1 percent to 20 percent of a toughening agent, 0.2 percent to 1 percent of an antioxidant and 0.2 percent to 1 percent of an anti-UV (Ultraviolet) agent. According to the preparation method provided by the invention, after the long fiber enhanced resin is prepared, the long fiber enhanced resin, the PP and other components are blended to uniformly disperse fibers in a polypropylene melt and the performance of the composite material is greatly improved. The low-shrinkage and low-density modified polypropylene composite material provided by the invention has excellent mechanical properties and also has the characteristics of low shrinkage rate and low density.

The invention discloses a glass fiber reinforcement polypropylene composite material and a preparation method thereof. The glass fiber reinforcement polypropylene composite material is prepared from,by weight, 1-20 parts of molecular sieves modified by a silane coupling agent, 30-70 parts of polypropylene, 25-70 parts of glass fibers, 3-15 parts of a compatilizer, 0.1-3 parts of an antioxidant and 1-5 parts of a light stabilizer. According to the glass fiber reinforcement polypropylene composite material, the molecular sieves modified by the silane coupling agent of a porous structure are adopted and mingled with a semi-finished product, namely a glass fiber reinforcement polypropylene composite material for replacing traditional fillers such as calcium carbonate and mica powder, so thatthe mechanical performance of the glass fiber reinforcement polypropylene composite material is improved, the glass fiber reinforcement polypropylene composite material has high stretching strength, high bending strength and high impact-resistance strength, and the production cost is reduced.

The invention relates to a polyamide composite material with good tactility and easy encapsulation and a preparation method thereof. The material comprises the following components in parts by weight:25-75 parts of PA6 resin, 15-50 parts of glass fiber, 5-15 parts of styrene copolymer, 2-8 parts of a compatilizer, 3-10 parts of a polar modifier, 0.2-0.5 part of an antioxidant and 0.2-0.5 part ofa dispersant, wherein the polar modifier is a graft copolymer of polyolefin and styrene substances; and during preparation, the other components except the glass fiber are weighed according to the parts by weight and then put into a high-speed mixer for mixing, then the mixture is put into a main feeding port of a double-screw extruder, the glass fiber is added from a side feeding port, and then extrusion and granulation are carried out. The polyamide composite material with good tactility and easy encapsulation, obtained by the preparation method provided by the invention, has the characteristics of good surface tactility, wear resistance, easy encapsulation and the like, and can be widely applied to the fields of electric tools, sports equipment, electronic appliances and the like requiring encapsulation and injection molding.

The invention provides copolyester of the structure as shown in the formula (I), wherein a is more than or equal to 1; b is more than or equal to 1; n is more than or equal to 1; x is more than or equal to 0; y is more than or equal to 0; x and y are not 0 at the same time. According to the preparation method, the crystallization behavior of 2,5-furadicarboxylic acid or a derivative thereof is changed by polymerization reaction of 2,5-furadicarboxylic acid or the derivative thereof with ethanediol, 1,4-butanediol, long-chain dihydric alcohol of a structure as shown in the formula (II) and a catalyst, so as to finally obtain the structure as shown in the formula (I), which is high in co-polyester toughness and high in elongation at break and impact strength.

The invention discloses a heavy oil viscosity reducer. The heavy oil viscosity reducer is a composite material of a graft polymer modified by a nano SiO2 silane coupling agent, wherein the polymer isa methacrylic acid long-chain alkyl ester-acrylamide copolymer; the methacrylic acid long-chain alkyl ester-acrylamide copolymer is characterized in that a long-chain alkyl group in the methacrylic acid long-chain alkyl ester is an alkyl group with 10-25 carbon atoms. The heavy oil viscosity reducer utilizes a special surface effect to be used as a nucleation point to adsorb wax to be crystallizedand separated out on the surface, the crystallization behavior of the wax is changed, and the original three-dimensional network structure of wax crystals is destroyed; meanwhile, strong polar groupson the surfaces of the nano particles adsorb colloid and asphaltene through hydrogen bond interaction to form a solvation layer on the surfaces of the nano particles, and due to the solvation layer,wax crystals can be prevented from being connected to form a net-shaped structure, a plane overlapping stacking structure of the colloid and the emerald green matter can be disassembled, and thereforethe viscosity of the thickened oil is greatly reduced.

The invention discloses a preparation method of a novel viscosity reducer for thick oil. According to the preparation method, methyl methacrylate, styrene, acrylamide and maleic anhydride are taken asraw materials, and the viscosity reducer for the thick oil is prepared by using aqueous solution polymerization and physical compounding methods; the viscosity reducer for the thick oil is prepared from the following raw materials in parts by weight: 30-50 parts of methyl methacrylate, 9-15 parts of styrene, 5-11 parts of acrylamide and 3-5 parts of maleic anhydride. According to the method, an oil-soluble polymer is obtained by using an initiator to initiate a polymerization reaction of monomers; after a small amount of the product is added into crude oil, the viscosity of the crude oil canbe effectively reduced, and the recovery rate of the thick oil is increased; therefore, the novel viscosity reducer is suitable for development and utilization in oilfields with thick oil.

The invention provides a reagent for reducing the condensation point of diesel, and a preparation method and an application thereof. The reagent for reducing the condensation point of diesel comprisesa tetradecyl methacrylate-N-vinylpyrrolidone copolymer, or comprises the tetradecyl methacrylate-N-vinylpyrrolidone copolymer and a tetradecyl methacrylat-N-vinylimidazole copolymer. The above polymer diesel pour point depressant can further improve the low-temperature fluidity of the diesel, and has the advantages of simple synthesis method, small dosage, and small use amount of raw materials. The condensation point of diesel containing the reagent is 24-26 DEG C less than that of diesel free from the pour point depressant, and the cold filter plugging point of the diesel containing the reagent is 9-11 DEG C less than that of the diesel free from the pour point depressant, so that the diesel has a good fluidity at a low temperature.

The invention relates to an abrasion-resistant PBT composite material. The abrasion-resistant PBT composite material is prepared from the following components in parts by weight: 70-90 parts of PBT, 1-3 parts of PMMA, 8-16 parts of TiO2-g-PMMA, 0.3-0.7 part of an antioxidant and 0.1-0.3 part of a lubricant. According to the technical scheme, the addition of TiO2-g-PMMA can improve the mechanical property of the material for two reasons: (1)with small particle size, large specific surface area, good dispersibility, high surface activity, TiO2-g-PMMA can generate a strong interface effect when used for modifying PBT, thus effectively improving the physical properties of the material; and (2) TiO2-g-PMMA can change the crystallization behavior of PBT, can take a heterogeneous nucleation effect on PBT, thus effectively improving the physical properties of the material.

The invention discloses a high-elasticity transparent mirror frame material, and relates to the technical field of modified polyamide. The high-elasticity transparent mirror frame material is prepared from the following raw materials in parts by weight: 80-90wt% of PA12, 5-20wt% of polyethylene, 0.5-3.0 wt% of antioxidant, 0.1-0.5 wt% of anti-reflection agent and 1.0-3.0 wt% of white oil, and the anti-reflection agent is one or a mixture of more of 4-tert-butylbenzoic acid, sodium benzoate, organophosphate, adipic acid, diphenylacetic acid and sodium succinate. The high molecular weight polyethylene and the anti-reflection agent are matched for use, so that the crystallization behavior of the PA12 can be effectively changed, the crystallization rate of the PA12 is increased, the crystallization density of the PA12 is increased, the grain size of the PA12 is promoted to be micronized, meanwhile, the crystallization proportion of the PA12 is reduced, the modified PA12 has better transparency, and meanwhile, the toughness is improved on the premise that the rigidity of the PA12 is kept .

The invention provides an anti-frosting grease composition used for delaying or inhibiting frosting. The anti-frosting grease composition contains base oil and beeswax, wherein the base oil is prepared from one or more of the following properties: C16/C18 ratio formed by 3-10 parts of fatty acid, 5-45 of iodine value, 35-41 DEGC of sliding melting point, and the ratio of 3-18 parts of solid fat content (SFC 20) at 20DEG C to solid fat content (SFC 35) at 35DEG C.

The invention relates to the technical field of high speed cables, and more specifically relates to a high speed signal transmission cable insulating material with extrusion resistance and a foaming technology thereof. The high speed signal transmission cable insulating material with extrusion resistance comprises the following raw materials in parts by weight: 40-60 parts of FEP resin, 20-40 parts of EP rubbers, 5-15 parts of polyacrylate, 4-8 parts of a filler, 1-3 parts of a nucleating agent, and 10-20 parts of an anti-oxidant. The high speed signal transmission cable insulating material with extrusion resistance has the advantages of better strength, toughness as well as heatproof and fireproof performances; after the product is extruded by outside force, because the strength is high,the deformation rate is obviously small, and the product also has a certain self-repairing function.

The invention relates to a high-performance wear-resistant PBT composite material, which is prepared from the following components in parts by weight: PBT is 70-90 parts; PA6 is 5-10 parts; TiO2-g-PMMA is 8-16 parts ; Antioxidant is 0.3-0.7 part; lubricant is 0.1-0.3 part. The addition of TiO2-g-PMMA in this technical solution can improve the mechanical properties of the material because of two points: 1) it has small particle size, large specific surface area, good dispersibility and high surface activity, and can produce The strong interfacial effect can well improve the physical properties of the material. 2) It can change the crystallization behavior of PBT, play a role in heterogeneous nucleation of PBT, and improve the mechanical properties of the material.

The invention discloses a method for improving the performances of a polypropylene-based thermoplastic vulcanized rubber. The method comprises the following steps: mixing the prepared thermoplastic vulcanized rubber with a nucleating agent, and regulating the crystal form content in the obtained material by a post-processing technique. The effect of the nucleating agent in the thermoplastic vulcanized rubber is controlled to change the crystal form structure of a continuous phase in the thermoplastic vulcanized rubber. The crystal form is regulated to further improve the elasticity and mechanical properties of the material, so improvement of the performances of the thermoplastic vulcanized rubber in the post-processing process is achieved. The method has the advantages of simple process and strong operability, and is generally suitable for polypropylene-based thermoplastic vulcanized rubbers.

The invention relates to the technical field of production of heaters, and in particular relates to a nano barium sulfate filled and PET (Polyethylene Terephthalate) modified heater shell material. The material is prepared from the following raw materials in parts by weight: 25 to 32 parts of metallocene linear-low-density polyethylene, 22 to 28 parts of PET, 3 to 6 parts of nano barium sulfate, 2 to 4 parts of precipitated silicon dioxide, 1 to 5 parts of dipentaerythritol ester, 1 to 3 parts of dihydric alcohol benzoate, 1.5 to 4 parts of DOP (Dioctyl Phthalate), 0.5 to 2 parts of an anti-ageing agent 288, 4 to 8 parts of castor-oil acid, 0.5 to 1.5 parts of a benzotriazole type ultraviolet absorbent, 0.5 to 2 parts of dodecyl dimethyl quaternary ammonium ethyl salt, 2 to 4 parts of nano aluminum oxide powder, 1 to 5 parts of calcite powder, 2 to 6 parts of acetic acid and 2 to 4 parts of a pigment. The heater shell material provided by the invention has high surface strength and good luster preservation and color preservation performance.

The invention relates to a methacrylate-N-naphthyl methacrylamide polymer diesel oil pour point depressant, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) under a solvent condition, heating and dissolving a polymerization inhibitor, methacrylic acid and higher alcohol, then adding a catalyst, carrying out a pre-reaction, raising the temperature, and continuing the reaction to obtain methacrylic acid higher alcohol ester; (2) under a solvent condition, stirring and dissolving an acid-binding agent and naphthylamine, then adding methacryloyl chloride, reacting, washing with water, and drying to obtain N-naphthyl methacrylamide; and (3) dispersing methacrylic acid high-carbon ester and N-naphthyl methacrylamide in a solvent, adding an initiator, and carrying out a polymerization reaction to obtain the target product. A polar group in the binary polymer diesel oil pour point depressant has a bicyclic structure, and the addition of a trace amount of the polar group has a good effect on reducing the condensation point and the cold filter plugging point of diesel oil, so that the condensation point can be reduced by 4-20 DEGC, and the cold filter plugging point can be reduced by 1-10 DEG C.