345results about How to "Low elongation at break" patented technology

The invention provides a method for preparing reactive fluid rubber-epoxide resin polymer, and belongs to the technical field of modified epoxide resin. The method comprises the following steps: 5 to 50 portions of reactive fluid rubber containing carboxyl or hydroxyl as a modifier, and 0.1 to 2.0 portions of catalyst are added into 100 to 200 portions of epoxide resin by weight; when the reactive fluid rubber containing the hydroxyl is used as the modifier, isocyanate or estolide with the same weight portion as the epoxide resin is required to be added; and an active group in the reactive fluid rubber reacts with an epoxide group in the epoxide resin for 2 to 6 hours at a temperature of between 100 and 180 DEG C to prepare the reactive fluid rubber-epoxide resin polymer with excellent toughness. The modified epoxide resin has improved toughness, non organic solvent is used in the whole synthesizing process, non environmental pollution is caused, the synthesizing process is simple and easily controlled, and the problem is not found in amplification experiments carried out for small amount, medium amount and large amount respectively, so that the method is applicable to industrial production.

The invention discloses a non-porous moisture permeable waterproof modified polyether ester functional film material and a preparation method thereof. The non-porous moisture permeable waterproof modified polyether ester functional film material of the invention contains components with the following weight percent: 50 to 70 percent of polyether ester, 10 to 30 percent of daiamid 6, 5 to 10 percent of hydrophilic polymer, 5 to 10 percent of ethylene-vinyl acetate copolymer, 2 to 4 percent of antibacterial masterbatch, 0.4 to 1 percent of novolac epoxy, 0.2 to 0.5 percent of antioxidant, 0.2 to 0.6 percent of processing additive. The modified polyether ester material of the invention has the advantages of polyester, polyether and daiamid, and has the advantages of good heat resistance, low cost and environmental protection. The film prepared in the process of melting casting has the functions of non-porous moisture permeation and watertightness, etc, and is mainly applicable to the production of clothing, waterproof breathable tape, and roof or wall film in the construction industry, etc.

The present invention relates to Dacron producing process, and is especially preparation process of high-strength and low-elongation Dacron filament for sewing thread. The preparation process with routine pre-oriented POY filament includes successive first high-power drafting in the first and the second heating discs, high temperature tensed heat setting in the first heating box and the third heating box, the second drafting and the high temperature relax heat setting in the second heating box. In the process, POY filament has good drafting performance, no teasing and breaking, and the final product has high strength, low elongation and less heat shrinkage.

The invention discloses a manufacturing method for high-modulus low-shrinkage PET industrial yarn, and the technological process of the method is as follows: hyperviscous melting to polyester fiber raw materials, metering, spinning, cooling, oil applying, stretching, hot shaping and reeled forming, wherein the cooling process sequentially comprises four parts including slow-cooling, pre-cooling, calm zone cooling and blow cooling, and the pre-cooling part adopts a passive hollow ring-shaped belt device. Through the introduction of the pre-cooling device, the irregularity caused by tows quivering produced under the down moving of a solidification point of fiber can be reduced, the deviation ratio of linear density can be controlled within a lower range, the purpose of reducing orientation and crystallization of embryo fiber is achieved, finally high-modulus low-shrinkage PET industrial yarn can be obtained, the high-modulus low-shrinkage PET industrial yarn has the advantages of high modulus, low dry heat shrinkage percentage, low breaking elongation and low linear density deviation ratio, and practical application can be well met.

A safety needle device includes a housing, a Huber needle, a cap and a sheath. The Huber needle has a first needle leg disposed in the housing and a second needle leg extending perpendicularly of the first needle leg. The cap is disposed over the second needle leg and is movable relative thereto from a first position with the second needle leg extending through the cap to a second position with a tip of the needle disposed in sealed relation in the cap. The sheath is concentrically disposed on and about the needle in a collapsed state, and secured to and between the housing and the cap. The sheath is extendable from the collapsed state to an extended state in response to movement of the cap from the first position to the second position.

The invention aims to provide a processing technology for utilizing a melt direct spinning production mode to produce medium strength polyester fiber filaments (FDY). Technical routes adopted by the invention are the same with conventional varieties, but first hot-roller temperature and second hot-roller temperature which are higher than universal-energy domestic filaments and higher drafting multiple are adopted, and simultaneously winding devices are improved in a certain degree, thereby the medium strength polyester fiber FDY filaments meeting requirements can be produced on the premise that large equipment investment is not increased. The FDY filaments have the characteristics of high strength and low elongation at break. The invention is mainly applied in the polyester fiber sewing thread and paper package rib reinforcement weaving field.

The invention relates to polyphenylene sulfide (PPS)/nano-calcium carbonate mixture and a preparation method for the fiber thereof. The method includes the steps of mixing polyester slices, nano-calcium carbonate particulates, reactive monomer and other additives in a high speed mixer while rising the temperature to approximately 205 DEG C so as to enable the polyphenylene sulfide slices to intenerate and the nano-calcium carbonate and other additives to be evenly adhibitted onto the polyphenylene sulfide slices, without heavy conglutination between the particles on the polyphenylene sulfide slices. The polyphenylene sulfide (PPS)/nano-calcium carbonate mixture prepared through the method has excellent processability and can be made into textile fiber, thin film or reinforcement plastics by means of melt blown or melt spinning process. The invention can greatly reduce the production cost and bring good economic benefits. The polyphenylene sulfide(PPS)/ nano-calcium carbonate mixture has good thermal stability, flame retardancy, chemical corrosion resistance and good mechanical property and spinning property; therefore the polyphenylene sulfide(PPS)/nano-calcium carbonate mixture is widely applicable to the industrial sectors like chemical industry, light industry and mechanical industry, and is particularly good for accelerating the popularization and application of high-temperature house-bag dust removal. The preparation method has the advantages of simple process, easy control, low cost, short production period, environment friendly and particularly being applicable to the industrial production.

The invention discloses application and a preparation method of a helical carbon nano tube. The helical carbon nano tube serving as a reinforcing material is used for reinforcing rubber. The preparation method includes: placing nickel oxide of the nanometer size into a quartz tube through a carrier; leading nitrogen, then hydrogen and finally acetylene, and conducting reduction to obtain primary products of the helical carbon nano tube; ultrasonic separating the primary product to obtain a deionized solution of the primary product; centrifugal separating the deionized solution to obtain a solid matter and drying; preparing mixed acid of concentrated nitric acid and concentrated sulfuric acid, adding the dried solid matter into the mixed acid, then heating to 90 DEG C and keeping the temperature for 6 hours; and separating the solid matter, washing to neutral and drying to obtain the helical carbon nano tube. The helical carbon nano tube is simple in process, low in cost and easy to achieve and is used for reinforcing the rubber. The rubber reinforced by using the helical carbon nano tube is improved on the aspects of 300% and 500% stress at definite elongation, elongation at break, hardness and abrasion compared with standard rubber reinforced by using carbon black.

The invention discloses a SiC fiber reinforced polyurethane series skid-resistant coating and a preparation method thereof. The skid-resistant coating is prepared from a component A, a component B, a component C, and other components through mixing, wherein the component A comprises polytetramethylene ether glycol, liquidated MDI, and E44 type epoxy resin; the B component comprises SiC short fiber, Al2O3 and a surface modifier; the component C comprises liquidated MDI, a chain extender, BaSO4, titanium dioxide and talcum powder; other components comprise a diluent, a defoaming agent and a levelling agent. The preparation method comprises the following steps: all components in the component A are mixed, so that the component A is prepared; all components in the component B are mixed, so that the component B is prepared; the component B, which accounts for 3-8% of the component C is mixed with the component C, and other components are added into the mixture so as to obtain a component D; finally, the component A and the component D are mixed according to the mass ratio of 1: (1-1.1), so that the skid-resistant coating is prepared. The skid-resistant coating disclosed by the invention is high in friction coefficient and adhesive force, excellent in comprehensive performance at low temperature and simple in preparation method.

The invention discloses a polylactic acid anti-bacterial-activity packaging material and a preparation method thereof and belongs to the technical field of macromolecule. The anti-bacterial-activity packaging material includes, in a blending manner, a matrix resin and natural anti-bacterial plant essential oil, wherein the matrix resin accounts 100 parts by weight and the natural anti-bacterial plant essential oil accounts 2-10 parts by weight. The matrix resin is blended by polylactic acid and polytrimethylenecarbonate with a weight ratio of the polylactic acid to the polytrimethylenecarbonate being (60-90):(40-10). The natural anti-bacterial plant essential oil includes clove essential oil, cinnamon essential oil, fennel essential oil and lemongrass essential oil, thyme essential oil or origanum vulgare essential oil. The ingredients are blended in a double-screw extruder and are prepared into the novel polylactic acid anti-bacterial-activity packaging material through a film blowing machine. The material has a certain tensile strength and a certain elongation at break, can be biologically degraded completely, has an excellent anti-bacterial activity and can be widely applied in the field of packaging.

The invention discloses an online double-layer composite plastic blow-molding film sheet which is formed by softening inner layers of a plurality of layers membrane bubbles which are co-extruded and blow-molded, wherein the inner layers of the membrane bubbles consist of EVA, COC and SEBS; a melting point of materials of the outer layers of the membrane bubbles is higher than a Vica softening point of the materials of the inner layer of the membrane bubbles. By optimizing the materials of the inner layers of the membrane bubbles, sticking is inhibited when the hot-pressing effect is improved, the thickness uniformity, the transparency, the heat-sealing uniformity, and the like of the membrane sheet are improved, the prepared membrane sheet has extensive re-processing capacity; after being heat-sealed and thickened, the membrane sheet is stretched and thinned, so that the film sheet has the performances of a blow-molding material and a flow casting material, and can be used as a packaging box back seal strip on a high-speed packaging body production line. Besides, the invention further discloses a manufacturing method for the online double-layer composite plastic blow-molding film sheet.

The invention belongs to the field of polytetrafluoroethylene functional material manufacturing, and particularly relates to a process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments. The process comprises the steps that disperse polytetrafluoroethylene granules are processed in a low-temperature oil supply mode, cured and subjected to vacuum compression molding, material strips are extruded in a pushing and pressing mode, a thin film is obtained through compression, longitudinal heating stretching is conducted twice, the thin film is slit into flat filaments, the flat filaments are twisted into round filaments, heating stretching and forming are conducted on the round filaments, and the PTFE filaments of different specifications are manufactured. The filaments manufactured through the process meet the ideal indexes of high strength and low elongation, thereby being an improvement and breakthrough in the quality of polytetrafluoroethylene filaments.

The invention discloses a crown ether modified polyimide hybrid membrane and a preparation method thereof. The preparation method comprises the following steps: under the conditions of the humidity lower than 50%, room temperature and mechanical stirring, in an atmosphere of nitrogen, dissolving crown ether and aromatic diamine into a polarity organic solvent until the crown ether and the aromatic diamine are completely dissolved, continuing to stir to obtain a crown ether/diamine inclusion compound solution, adding aromatic dianhydride to the crown ether/diamine inclusion compound solution, after adding the aromatic dianhydride, continuing stirring to obtain a crown ether modified polyamide acid solution, uniformly smearing the crown ether modified polyamide acid solution on a clean glass sheet, eliminating bubbles, raising the temperature according to the setup program, after treatment, cooling the glass sheet to the room temperature, stripping off the membrane, drying and obtaining the crown ether modified polyimide hybrid membrane. In the invention, the crown ether molecules sleeve the polyamide acid chains to form necklace type supramolecular structures; the polyimide molecular chains are extended to be three-dimensional from two-dimensional type, so that the flexibility of the molecular chains is reduced, and the rigidity is promoted.

The invention discloses bi-phosphorous flame-retardant copolymer nylon and a preparation method thereof. The nylon is characterized in that a midbody which is synthesized by diamine of phosphine oxide category and dibasic alcohol of phosphine oxide category, namely bi-phosphorous organophosphoryl ammonium salt, is adopted, and the bi-phosphorous flame-retardant copolymer nylon is prepared through copolymerization between the bi-phosphorous organophosphoryl ammonium salt and polyamide 66 salt. The bi-phosphorous flame-retardant copolymer nylon is an amorphous glass form polymer in milk white, the melting range is between 255 DEG C to 275 DEG C, and the relative viscosity is 2.60-2.90; the total phosphorus content of the bi-phosphorous flame-retardant copolymer nylon ranges from 0.6% to 0.8%, the flame retardation level is grade UL-94V-0, the tensile strength is not lower than 75.0 Mpa, and the elongation at break ranges from 54.5% to 60.0%. The bi-phosphorous flame-retardant copolymer nylon has the advantages being halogen-free flame retardant, high in viscosity, free of molten drops and high in mechanical strength, and the nylon can be widely applied to the fields of fibers and textile.

The invention relates to polypropylene synthetic paper and a production method thereof. The polypropylene synthetic paper comprises an outer surface layer, a middle layer and an inner surface layer, and the outer surface layer is obtained by preparing titanium dioxide, calcium carbonate and modified polypropylene copolymer; the middle layer is obtained by preparing polypropylene; the inner surface layer is obtained by preparing the titanium dioxide, the calcium carbonate and the modified polypropylene copolymer. The production method comprises the following steps: 1 extruding the outer surface layer raw materials, the middle layer raw materials and the inner surface layer raw materials through an extruder respectively; 2 extruding the melt of the raw materials which are extruded through the extruder of each layer through a T-shaped die head through a three-layer co-extruding tape casting method, after film is formed, conducting sizing and curing, and obtaining the polypropylene synthetic paper. According to the polypropylene synthetic paper, the surface is flat and smooth, the uniformity of the film thickness is good, and the neatness of end faces is good; the appearance expressive force is good, the light transmittance of the synthetic paper is low, and the wetting tension is high; the thickness control range is wide, traditional fiber paper can be replaced, and the polypropylene synthetic paper is used for presswork, commodity package materials and manufacturing adhesive tapes and tags.

The invention relates to a colored special-shaped size-stabilized type polyester monofilament and a preparation method thereof. The colored special-shaped size-stabilized type polyester monofilament is composed of, by weight, 84.5 parts to 99.75 parts of polyethylene terephthalate (PET), 0.2 part to 5 parts of color master batches, 0.1 part to 10 parts of poly(ethylene 2,6-naphthalate) (PEN) and 0.05 part to 1 part of barium sulfate powder. By adding the PEN, the thermal resistance of fiber is improved, and no roller sticking phenomenon can occur even when the heat setting temperature is above 245 DEG C; nanometer barium sulfate plays a role of plasticizer, the slippage among high polymers is improved, the drawing ratio is increased, the fiber contraction rate is decreased, and meanwhile the colored fiber can be more uniform and brighter in color and luster; the high drawing ratio is achieved in the fiber drawing process, induced crystallization produced in the fiber drawing process is improved, and the boiling water shrinkage is decreased; the fiber preparing process is simple, dry strands are uniform, fiber is uniform in thickness, woven fabric is smooth, grids are exquisite and uniform, and a colored special-shaped filament is softer and richer in color so that stylized reflection can be facilitated.

The invention discloses a long fiberglass-reinforced polypropylene composite material, which is prepared from the raw materials of polypropylene, a compatilizer, a filler, cooling masterbatch, an antioxidant, a coupling agent and a flow modifier at a ratio of 52.4:4:40:1:0.1:0.5:2. The preparation method comprises the steps of: (1) mixing and stirring the raw materials according to the ratio; (2) adding the mixture obtained in the step (1) to a double-screw extruder, extruding melt by a double-screw extrusion mouth mold, and conveying to an immersing device; (3) preheating and drying continuous long fiberglass, conveying to an immersing mold from the mold head, and entering a coating device for coating; and (4) finally cooling, solidifying and pelleting. The composite material has the advantages of high rigidity, high toughness, low elongation at break, high elasticity modulus, resistance to fire, mild, heat and corrosion, good dimensional stability and the like.