71results about How to "Increased tensile elongation at break" patented technology

The invention discloses a poly-lactic acid block copolymer. The feature is that it is made from the end hydroxyl poly-lactic acid with intrinsic viscosity of 0.05-0.5dL/g and aliphatic polyester glycol with intrinsic viscosity of 0.1-1.0dL/g taking fusion reaction under existing of diisocyanate. The intrinsic viscosity of the copolymer is 0.7-2.5dL/g, and tensile strength is 10-40MPa, elongation at break is 100-800%. The invention also discloses the manufacturing method for the copolymer. It has the advantages of good toughness, strong tensile strength, high tensile fracture elongation, etc.

The invention provides a transparent, tear-resistant and biodegradable polylactic acid thin film and a preparation method thereof, belonging to the field of high molecular material and solving the technical problem of high brittleness, poor tear resistance and poor flexibility of the polylactic acid thin film in the prior art. The transparent, tear-resistant and biodegradable polylactic acid thin film comprises a mixture of polylactic acid, a toughening agent, a plasticizer, a lubricant and a plastic lubricant. The preparation method comprises the following steps: mechanically mixing polylactic acid, the toughening agent, the plasticizer, the lubricant and the plastic lubricant to obtain a premix at first; feeding the premix from the feeding opening of a twin-screw extruder; metering the plasticizer and adding the metered plasticizer from the liquid feeding opening of the twin-screw extruder; and pelleting by melt extrusion to finally obtain the transparent, tear-resistant and biodegradable polylactic acid thin film. The elongation at break and tearing strength of the polylactic acid thin film provided by the invention are improved obviously, the transparency of polylactic acid is retained, the brittleness defect of the polylactic acid thin film is solved, the rheological behavior of the material is improved obviously, the tensile strength is 43.2MPa at most, the elongation at break is 48%, and the right angle tear strength is 127KN/m.

The invention relates to a preparation method of polyurethane plasticizing monomer casting nylon compound material. The material is made through pouring the raw material of polyurethane prepolymer, and caprolactam, etc. The main performance of the material is characterized in that the mechanical strength is improved, the tensile fracture elongation rate is increased along with increasing of the use amount of the polyurethane prepolymer, the impact strength is enhanced along with the increasing of the use amount of the polyurethane prepolymer, and the tribology performance and the antistatic performance are improved remarkably.

The invention provides a transparent and toughening polylactic acid resin and method for preparing the same. The polylactic acid resin consists of polylactic acid, methyl methacrylate-butyl acrylate copolymer as the flexibilizer, citrate plasticizer, pentaerythritol toltetranitrate (Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-) as the antioxidant and tris (2,4-ditert-butylphenyl) phosphate. First, premix is prepared by mixing polylactic acid, flexibilizer, plasticizer and antioxidant mechanically. Then the premix is subject to melt extrusion and granulation by utilizing double-screw extruder. The above method has the advantages of increasing the anti-impact strength, tensile strength and elongation at break of polylactic acid and maintaining the transparency thereof. In addition, the viscosity of the blends is decreased, thereby remedying the defects of brittleness of polylactic acid and improving the rheological behavior of materials obviously. The impact strength is up to 60.1KJ/M2.The light transmittance and the haze of the products are 89% and 8.5% respectively when the thickness thereof is 0.04mm.The above polylactic acid resin, instead of PE and PVC, is applicable to the preparation of films, plates, sheet materials, foamings and injection moulding plastics.

The invention belongs to the field of polymer materials, and particularly relates to a PLA (polylactic acid) biodegradable thin film and a preparation method thereof. The PLA biodegradable thin film is prepared from the following components of PLA, PBSA (poly(butylene succinate-co-adipate)), PBC (polypropylene carbonate), a plasticizer, a lubricant and a pore forming agent. The preparation methodcomprises the following steps of mechanically mixing the PLA, the PBSA, the PBC, the lubricant and the pore forming agent; adding the mixed raw materials into a material hopper of a double-screw extruder; metering the plasticizer by a metering pump, adding via a liquid adding port of the extruder, starting the solid charge and liquid charge, smelting, extruding and granulating, so as to obtain thePLA resin material; performing blow molding and film forming on the PLA resin material, so as to obtain the PLA-based thin film. The PLA-based thin film has the advantages that the mechanical property is better, and the transparency is good; the complete biodegradable effect is realized; the PLA-based thin film can be used for replacing PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride) and the like to prepare thin films and sheets.

The invention provides a modified polyester/wool blended fabric, which is formed by blending modified polyester and wool. The modified polyester structurally comprises the following structural units:, wherein m1 is more than 1 but less than 160; m2 is more than 1 but less than 70; m3 is not less than 0 but less than 20; and m4 is not less than 0 but less than 20; the blended fabric can be one-bath dyed with acidic dye or acidic dye and disperse dye, thus dyeing procedures are simplified, energy conservation and pollution reduction is saved, and energy consumption can be prominently reduced owing to the dyeing temperature below 100 DEG C.

The invention relates to a nanocomposite of nylon 6/ montmorillonite in the shape of a montmorillonite laminiplantation and a preparation method thereof. The nanocomposite is made up of 100 shares of nylon 6, 1 to 10 shares of modified montmorillonite and 0.1 to 1 share of antioxidizer; the nanocomposite is a stripping material obtained by melting intercalation. The nylon 6/ montmorillonite nanocomposite with special micro morphostructure is manufactured sequentially by realizing melting intercalation by means of twin-screw extrusion, by injection premolding, and by exerting high pressure from a flat vulcanizing machine with a temperature ranging between 20 DEG C and 100 DEG C thus producing solid flow. The montmorillonite, dispersing in polymeric matrix of the nanocomposite, is in a high parallel alignment. The nanocomposite is internally provided with micro laminated structure similar with the internal structure of seashell, and has larger elongation fracture tensile rate than common material of the same components. This is the first time to introduce bionics in macromolecule/ montmorillonite nanocomposite.

The invention provides a polylactic acid (PLA)/ poly(butylene succinate-butylene adipate) (PBSA) blown film and a preparation method thereof. The blown film comprises a mixture of PLA, PBSA, plasticizer diethylene glycol monobutyl ether adipate, a lubricant, a plastic lubricant and an antioxidant. The PLA, the PBSA, the lubricant, the plastic lubricant and the antioxidant are first mechanically mixed into a premix, the premix is added through a feeding port of a twin-screw extruder, meanwhile the plasticizer diethylene glycol monobutyl ether adipate is metered and added in through a liquid feeding port of the twin-screw extruder, modified polylactic acid blown film special resin is prepared by melt-extruding, water-cooling, pelletizing and drying, the modified polylactic acid blown film special resin is blown by a film blowing machine to form a transparent tear-resistant biodegradable film. The PBSA, the plasticizers, the lubricant, the plastic lubricant and the antioxidant can effectively increase the tensile elongation at break and tear strength of polylactic acid films, maintains the transparency of the polylactic acid, and solves the brittleness defects of the polylactic acid films. The polylactic acid (PLA)/ poly(butylene succinate-butylene adipate) (PBSA) blown film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and the like for preparation of films and sheets.

The invention provides a production method of a high-purity micro-powder silica plastic anti-block agent; high-purity water glass reacts with sulfuric acid to gain sodium sulfate and silicic acid; the sodium sulfate is washed by water to gain silicious colloid which is centrifugally dehydrated, and dried by micro-wave to gain pure SiO2 powder which is crushed by an airflow crusher to gain the high-purity micro-powder silica plastic anti-block agent. The production method of the high-purity micro-powder silica plastic anti-block agent has simple process, high purity and small particle size of the gained products, is suitable for the production and use of top-class plastic films, can obviously improve the top-grade product rate, reduces the cost of the product, improves the tensile yielding strength of the film to 13.5-14.5MPa generally, improves the tensile breaking elongation rate of the film to about 1400 percent, and obviously reduces the fish eye number of the film.

The invention provides a preparation method of a high-transparency easy-to-tear polylactic acid blow-molded film. The high-transparency easy-to-tear polylactic acid blow-molded film is composed of a mixture of polylactic acid (PLA), polyterephthalic acid-adipic acid-butanediol ester (PBAT), a plasticizer acetyl tributyl citrate, a lubricant ethylene bisstearamide, an opening agent erucyl amide anda nucleating agent white carbon black. The preparation method comprises the following steps: weighing PLA, PBAT, a plasticizer, a lubricant, an opening agent and a nucleating agent in proportion, adding into a mixer, uniformly mixing, adding from a feeding hole of a double-screw extruder, carrying out melt extrusion, water cooling, pelletizing and drying to obtain special modified polylactic acidfilm-blowing resin, and carrying out water cooling blow molding film formation by a film blowing machine through a down-blowing method to obtain the high-transparency easily-torn polylactic acid blow-molded film. According to the invention, the PBAT, the plasticizer, the lubricant, the opening agent and the nucleating agent have a synergistic effect, so that the tensile elongation at break of thepolylactic acid film can be effectively improved, the polylactic acid film has high transparency, the flat wrinkle-free easy-to-tear high-transparency complete biodegradable film is obtained, the tensile strength is as high as 54.6 MPa, and when the thickness of the film is 0.025 mm, the light transmittance reaches 94% or above and the haze reaches 5.3%; and the film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and other films.

The invention discloses a processing method for a supra-macromolecule polyethylene composite pipe. The processing method comprises the following steps of (1) uniformly mixing supra-macromolecule polyethylene resin, graphite, polyethylene wax and an antioxidant which serve as raw materials, adding the uniformly mixed raw materials into a material barrel of a screw extruder, and manufacturing a pipe with the same shape as that of a neck mold with a certain shape through the neck mold on the screw extruder under the rotary extrusion action of a screw, wherein the pipe passes through a sizing device and a cooling device and is cooled to be hardened and sized by a water-oil cooling mode; continuously and uniformly leading out a product during cooling after a product plastic piece is extruded from the neck mold, cutting the cooled and sized product through a cutting device, and inspecting the cut product, wherein the qualified product is a supra-macromolecule polyethylene pipe; (2) cutting and posttreating the supra-macromolecule polyethylene pipe, and putting the post-treated supra-macromolecule polyethylene pipe into a steel pipe to obtain the supra-macromolecule polyethylene composite pipe. According to the processing method, the technology is simple; the supra-macromolecule polyethylene composite pipe is easy to produce and manufacture; the manufactured pipe is high in abrasion resistance, self-lubrication property and intensity, stable in chemical property and high in aging resistance.

The invention provides modified poly (propylene carbonate), which comprises a cross-linked poly (propylene carbonate) with polyphenyl polymethylene polyisocyanates as a cross-linking agent, as well as a polymer of hexanedioic acid and 1,2-propylene glycol ester, wherein the mass ratio of poly (propylene carbonate) to the polyphenyl polymethylene polyisocyanates is 100:(0.1-2), and the mass ratio of the cross-linked poly (propylene carbonate) to the polymer of hexanedioic acid and 1,2-propylene glycol ester is 100:(5-20). A preparation method of the modified poly (propylene carbonate) comprises the following steps: blending and extruding the poly (propylene carbonate) and the polyphenyl polymethylene polyisocyanates to obtain the cross-linked poly (propylene carbonate); and blending and extruding the cross-linked poly (propylene carbonate) and the polymer of hexanedioic acid and 1,2-propylene glycol ester to obtain the modified poly (propylene carbonate). The modified poly (propylene carbonate) provided by the invention is good in thermal stability, high in tensile elongation at break, good in transparency and capable of being biodegraded completely.

The invention discloses a production process of a nanometer modified superhigh-molecular-weight polyethylene wear-resisting pipe, comprising the steps of (1) preparing raw materials in mass percentage, uniformly mixing 74-90% of superhigh-molecular-weight polyethylene resin, 3-5% of nanometer laminated silicate, 2-8% of Si3N4, 3-10% of polyethylene wax and 2-3% of graphite; (2) adding material, performing reacting, extruding and molding; (3) cooling, shaping and drawing; (4) cutting; (5) post treating. The flowing property of the superhigh-molecular-weight polyethylene is improved due to the adding of nanometer laminated silicate and Si3N4, so that the mechanical property of the product is improved and the wear resistance of the product can be improved by more than 40%.

The invention discloses a method for producing an unsaturated polyester resin by using a polycarboxylic anhydride by-product, comprising the following steps: preparing raw materials including 5-20 parts of a polycarboxylic anhydride by-product, 0-10 parts of phthalic anhydride, 16-22 parts of maleic anhydride or fumaric acid and 30-38 parts of dihydric alcohol; preparing unsaturated polyester fromthe raw materials by an esterification polycondensation method; diluting unsaturated polyester and styrene to obtain liquid-state unsaturated polyester resin. The unsaturated polyester resin producedby the method keeps relevant properties equivalent to the existing similar products, and the mechanical properties are at least equivalent after curing of the resin, and especially the tensile elongation at break, the heat distortion temperature of the load and Barcol hardness are all promoted. By reusing waste polycarboxylic anhydride by-product to partly or completely replace phthalic anhydride, resource utilization is improved, and cost of raw material, operating cost of manufacturing enterprises and other cost are reduced. Production efficiency is high, and energy consumption is also reduced to some extent.

The invention provides a polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and a preparation method thereof and belongs to the technical field of high molecular materials. The polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and the preparation method solve the problems that existing PP melt is low in intensity, and it is difficult to keep transparency after blending and toughening are conducted. The inner layer and the outer layer of the upward blowing film are ethylene blender, and the middle layer is propylene random copolymer. The invention further provides the preparation method of the polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film. The propylene random copolymer is selected to serve as the middle layer of the upward blowing film, the tensile elongation yield and the tearing strength of the PP film can be effectively improved, proper models of PE and PP are blended to serve as the inner layer and the outer layer, the compatibility of the middle layer of the PP film and the PE of the inner layer and the outer layer can be increased, the binding force among layers is improved, the stripping phenomenon among layers is avoided, the transparency of PP can be kept, and the hot-shrinkage rate of multiple layers of films is raised.

The invention provides a high-elasticity and high-toughness gel micro-nano particle and a preparation method thereof. The high-elasticity and high-toughness gel micro-nano-particle is prepared from, by weight, 5 to 20 parts of a monomer, 0.05 to 0.2 part of nano-cellulose, 0.015 to 0.6 part of a cross-linking agent, 0.04 to 0.2 part of an initiator and 79 to 95 parts of deionized water. The invention further provides the preparation method of the high-elasticity and high-toughness gel micro-nano particle. The nano-cellulose is introduced into a gel network structure as a rigid unit of the gel,so the toughness of the gel is improved, and the contradiction between the elasticity and the viscosity of the gel is regulated; and the preparation process is simple and easy to operate, the cost islow, and the problems of low mechanical strength, poor stability, poor crack regulation and control capability and the like of a gel system are effectively solved.

The invention discloses a completely biodegradable film and a preparation method thereof. The completely biodegradable film is prepared from poly(butylene adipate-co-terephthalate), polyglycolic acid, a chain extender styrene-acrylic acid-glycidyl methacrylate copolymer, a plasticizer poly(succinic acid-1, 2, 4-trimethyl-1, 3-pentanedionate), a plasticizer poly (butylene adipate-co-butylene terephthalate), a plasticizer polysuccinic acid-1, 2-propylene glycol ester, a nucleating agent, a lubricant ethylene bisstearamide and an anti-blocking agent erucyl amide. The preparation method comprises the following steps: weighing the components according to the formula, mechanically mixing to form a premix, metering and adding the plasticizer polysuccinic acid-1, 2-propylene glycol ester from a liquid feeding port of a twin-screw extruder, carrying out melt extrusion, water cooling, pelletizing and drying to obtain special resin for film blowing, and carrying out blow molding film forming through a film blowing machine to obtain the completely biodegradable film. The chain extender, the nucleating agent and the plasticizer can effectively improve the tensile elongation at break and tear strength of the film and obviously improve the rheological behavior of the material, and the film has good mechanical properties and excellent biodegradability and can replace PE, PP, PVC and the like to prepare films and sheets.