569results about How to "Fast crystallization" patented technology

The invention relates to a low water absorption polyamide composite and preparation method thereof. 10-90 parts by weight of polyamide and 3-10 parts by weight of phyllo-silicate clay and less than 2 parts by weight of additive are placed into a high speed mixer to be premixed for 20min and then are added into a double screw extrusion machine, and conveying, melting, cutting, extrusion, cooling and granulation are carried out, thus obtaining polyamide/phyllo-silicate master batch, then the polyamide/phyllo-silicate master batch, 10-60 parts by weight of styrene resin, 2-10 parts by weight of compatilizer and 5-20 parts by weight of short glass fiber are placed into the high speed mixer to be premixed for 20min, temperature is controlled to be 40-60 DEG C, and finally extrusion granulationis carried out in the double screw extrusion machine, thus obtaining the low water absorption polyamide composite. Compared with prior art, the invention has the advantages of solvent resistance, high tenacity and easy processability of polyamide and the advantage of low water absorption of ABS resin; besides, phyllo-silicate clay speeds up crystallization of nylon, degree of crystallization and mechanical strength are improved, extremely low water absorption is obtained, and size stability is greatly improved while impact toughness is maintained.

Disclosed are certain novel polyester compositions particularly useful for shaping or forming into containers and similar shaped articles by thermoforming procedures. The polyester compositions comprise a thermoplastic polyester, an impact modifier and a polyester crystallization rate enhancing component selected from poly(tetramethylene terephthalate) homo- and co-polymers. The polyester compositions exhibit improved crystallization rates as compared to similar compositions not including impact modifier or compositions using other types of crystallization rate enhancing components such as polyolefin-based polymers.

A bioplastic composition comprising a biopolymer containing from 10 - 40 wt% of coated inorganic particles; the particles being coated with one or more of fatty acids, fatty acid derivatives, rosins, rosinates, polyolefin based waxes, oligomers and mineral oils, and combinations thereof has improved stiffness and toughness and also has improved crystallisation kinetics rendering it useful for extrusion, injection moulding and thermoforming.

This invention relates, in general, to blend compositions of an unmodified poly vinyl alcohol and a thermoplastic elastomer and thermoplastic film and fiber structures comprising these blend compositions. More specifically, this invention relates to substantially water-free films and fibers comprising unmodified polyvinyl alcohol and a thermoplastic elastomer.

Disclosed is a polyethylene composition having faster crystallization rate and improved environmental stress cracking resistance. The polyethylene composition comprises a multimodal polyethylene and a nucleating agent. The multimodal polyethylene comprises from 25 to 50 wt % of a low molecular weight ethylene homopolymer component, from 25 to 50 wt % of a medium molecular weight ethylene copolymer component and from 25 to 50 wt % of a high molecular weight ethylene copolymer component. The polyethylene composition has an environmental stress cracking resistance (ASTM D1693, Condition B in 100% Igepal) greater than or equal to 40 days and a crystallization half time less than or equal to 70% of the crystallization half time of the multimodal polyethylene without nucleating agent.

The invention discloses a degradable plastic composition as well as a preparation method and application thereof. The degradable plastic composition comprises the following components in parts by weight: 70-99 parts of at least two degradable resins, 0-6 parts of a toughening agent, 0.5-5 parts of a compatilizer, 0.05-3 parts of a chain extender, 0.05-5 parts of an anti-hydrolysis agent, 0.05-5 parts of a nucleating agent and 0.05-3 parts of a slipping agent. By matching two or more degradable resins, the problem of poor toughness or rigidity of the existing single degradable resin is solved,so that the product has excellent comprehensive mechanical properties, excellent rigidity and toughness, high impact property, high nominal strain at break and higher flexural modulus and tensile strength.

The invention relates to a preparation method of an antibacterial silk fibroin fibrous membrane. The preparation method comprises the following steps: dissolving silver salt into water and adding aqua ammonia to form clarifying transparent silver ammino and an ionic solution firstly; adding water-insoluble fatty alcohol, and adopting a microwave irradiation technology to prepare silver nanoparticles; adding the obtained silver nanoparticles into a prepared silk fibroin solution, mixing the obtained silver nanoparticles and the prepared silk fibroin solution, so as to form a spinning solution; then preparing the antibacterial silk fibroin fibrous membrane through a static spinning technology. According to the preparation method provided by the invention, the method is simple, an interface system is regarded as a reaction medium, so that the products can be transferred between different phases, the surface adsorbent can be replaced, and good uniformity of the nanoparticles can be guaranteed; the microwave irradiation technology is adopted, so that the crystallization speed of the products can be improved, the operating steps are simple, the cost is low, the reaction speed is high, the efficiency is high, and a certain universality is provided; the nano-silver has hydrophobicity and can be dispersed into the silk fibroin solution very well, which is further in favor of preparing antibacterial silk fibroin membrane with good uniformity.

The invention relates to bio-degradable polyester and a method for preparing the same, and belongs to the technical field of bio-degradable copolyester products. The number-average molecular weight of the bio-degradable polyester material is 6,000 to 135,000g/mol, the molecular weight distribution is 1.2 to 6.5, and the crystallization temperature range is between 15 and 105 DEG C; the bio-degradable polyester overcomes defects existing in conventional products and can be used for producing film-forming materials, sheets and foam materials, the sticking characteristics are greatly changed in the machining process, and the appearance quality is higher; and after the heat resistance is improved, the novel polyester material can also be used in the machining process with a long cycle period, such as an injection machining process, and the bio-degradable aliphatic/aromatic polyester material provided by the invention possesses excellent mechanical properties.

The invention discloses a compound type cement-based permeable crystallization type waterproof material. The material comprises the following raw materials in parts by weight: 320-570 parts of Portland cement, 240-480 parts of quartz sand, 60-250 parts of heavy calcium, 5-150 parts of silica fume, 2-125 parts of redispersible latex powder, 0.5-50 parts of a surfactant, 0.5-30 parts of a catalyst,0.05-2 parts of cellulose ether. After the material and water are acted, active chemicals in the waterproof material employ water as a carrier and penetrate into internal porosities of cement concretedue to high permeability, in order to promote generation of hydration reaction of unhydrated cement particles, generate a lot of needle-like crystal, and block closed capillary channels, and the cement concrete has excellent waterproof impervious impermeability function; when new fine cracks are generated in concrete, under a wet condition or water infiltrates, active chemical substances are reactivated, new hydration reactions are generated by catalysis, and new needle-like crystals are generated in slits in order to fill and block fine cracks with excellent self-repairing function.

The invention discloses a process for producing a thick plate of plastic die steel. The thick plate of the plastic die steel is obtained by the following steps of: pouring by using an open-close type water-cooled die casting machine, performing reasonable heating system, rolling and normalizing and annealing after rolling. Low temperature pouring and a pouring process of feeding on bottom pouring are performed, so molten steel is quickly solidified by forced cooling of circulating water; the molten steel is not born any shrinkage resistance so as to ensure that a wide surface of the die casting blank does not have any crack; the heating temperature of a steel ingot does not exceed 1,280 DEG C, so that alloy elements are fully dissolved; the rough rolling temperature is 1,100 to 1,200 DEG C, and a rough rolling stage is performed at the high temperature under high pressure; after a fine rolling stage is performed at the temperature of 950 DEG C, the finishing temperature is greater than or equal to 920 DEG C; the discharging temperature after rolling is 750 to 830 DEG C, and the steel plate is cooled in pile for 72 hours after rolling; the steel plate is normalized and annealed; and the solution temperature is about 870 DEG C, and the aging temperature is 500 to 550 DEG C, so that the thick age-hardened plastic die steel plate is obtained. After flaw detection, each performance index of the plastic die steel produced by the invention meets the requirement.

Provided is a polyarylene sulfide resin molded article having a good surface state which can be molded at a significantly high crystallization speed without impairing heat resistance, mechanical properties, chemical resistance, dimensional stability and flame retardancy of polyarylene sulfide resins. The resin composition comprises (A) 100 pts. wt. polyarylene sulfide resin, (B) 0.1-10 pts. wt. aromatic phosphate of a specific structure, and (C) 3-35 pts. wt. polyphenylene oxide resin.

The invention belongs to high molecule material technology field, especially a foaming CPET sheet material and a method for preparing the same. The invention provides a forming CPET sheet material, which is produced by uniformly mixing 100 portions of PET, 0.1-40 portions of blowing promoter and 0.1-5 portions of foaming agent, extruding and forming. The blowing promoter is prepared by uniformly mixing 0.1-30 portions of ethylene-acrylic ester-glyceryl methacrylate tercopolymer or acrylic ester with core-shell structure, 0.1-10 portions of polyfunctional group substance with high activity, 0.3-10 portions of crystal nucleating agent and 10-100 portions of carrier resin. The inventive foamed CPET sheet material has the finished product density range of 0.60-0.95 g/cm[3] and high impact strength, is suitable for producing dual purpose food trays for freezing temperature preservation and microwave/oven heating, and the deep chamber containers in the medicine and electric product.

The invention provides a preparation method of a europium oxide (EUO) type molecular sieve. The preparation process comprises the steps: adding one or more of ethanol, propylene glycol, methyl alcohol and acetone with a proper amount to be taken as an organic solvent; filling a high-pressure inert gas into a high-pressure kettle, and carrying out sectional type crystallization under a certain condition; filtering and washing the product to be neutral; and drying, roasting to obtain the EUO molecular sieve. The organic solvent is added, so that a template agent precursor is promoted to be dissolved in an aqueous phase, and the generation of a template agent is accelerated; and therefore, the crystallization speed of the molecular sieve is accelerated, and the crystallization time of the molecular sieve is remarkably shortened.

The invention provides a polyester/metal fiber composite material composition, which comprises the following components by weight portion: 100 portions of polyester, 0.5 to 100 portions of metal fiber subjected to surface treatment by a coupling agent, and 0 to 3.8 portions of optionally high-molecule acceptable processing aid. A polyester composite material integrating excellent electric conductivity, heat conductivity and quick crystallization property can be prepared by the polyester/metal fiber composite material composition.

The invention relates to high-temperature-resistant polylactic acid injection molded ceramic-like tableware and a preparation method thereof, and belongs to the field of high polymer materials. Raw materials comprise 70-90 parts of polylactic acid, 5-15 parts of a toughening agent, 0.05-0.20 part of a chain extender, 0.5-1 part of an organic nucleating agent, 5-20 parts of an inorganic nucleatingagent, 0.05-1.0 part of an antioxidant and 0.5-2 parts of an anti-hydrolysis agent. The high-temperature-resistant polylactic acid injection molded ceramic-like tableware and the method have the advantages that the process is simple and clear, high in processing efficiency and easy to operate; the toughening agent and the nucleating agent are used for synergistically modifying the polylactic acidso that the toughness of the polylactic acid is improved, the heat resistance of the polylactic acid material is achieved, and the toughness and heat resistance of the polylactic acid can be greatly improved. The organic nucleating agent and the inorganic nucleating agent are adopted, so that when the polymer is subjected to melt crystallization, the crystallization speed of the polymer is increased, the spherocrystal size is changed, the thermal deformation temperature of the polymer is remarkably increased, the application of the product is met, in-mold crystallization is used in the injection molding process of the product, the surface gloss of the product is improved, crystallization perfection can be further promoted by using the crystallization nucleating agent, and the product has higher strength and surface gloss.

The invention discloses intumescent flame retardant polybutylene succinate and a preparation method thereof, which are characterized in that 80 to 85 percent of polybutylene succinate and 15 to 20 percent of intumescent flame retardant agent as well as 0 to 3 percent of synergist are added to an internal mixer to be cut, melt down and blended to obtain the product. Pictures of a high-resolution transmission electron microscope show that nano-grade dispersion is formed in the Polybutylene succinate basal body; the oxygen index reaches 40 and passes through the vertical burning test standard UL-94V0 grade; the initial thermal decomposition temperature is 321 DEG C, the maximum thermal decomposition temperature is 353 DEG C, and the residual quality score is 11.6 percent at the temperature of 700 DEG C; the pictures of the carbon layer shows that a compact intumescent carbon layer is formed, and a plurality of complete bubbles are formed. The intumescent flame retardant polybutylene succinate can be used for the foaming materials and the packing materials of the toy, household appliance, daily chemicals, food and medicines.