114 results about "Relative viscosity" patented technology

The invention relates to the technical field of injection molding magnetic powder materials, and discloses an injection molding magnet material, a preparation method and an injection molding magnet, and the injection molding magnet material is prepared from the following raw materials in parts by weight: 80-92 wt.% of magnetic powder; 3-9 wt.% of a binder A; 3-9 wt.% of a binder B; 0.3 to 2 wt.% of a coupling agent; 0.2 to 1.5 wt.% of an auxiliary agent; the binder A and the binder B are PA10T / X, the relative viscosity of the binder A and the relative viscosity of the binder B range from 1 to 2, and the difference value between the relative viscosity of the binder A and the relative viscosity of the binder B is not less than 0.3. The binding agent A and the binding agent B with different relative viscosities are adopted for improving the mechanical property and the fluidity of the magnetic material correspondingly, it can be guaranteed that the magnetic material has good size stability in a high-humidity environment and has high strength in a low-temperature environment, the fluidity of the magnetic material is greatly improved, and the magnetic material has the good mechanical property. Meanwhile, the material cost of the injection molding magnet material is reduced.

The present disclosure relates to a thermoplastic resin composition and an exterior material including the same. The thermoplastic resin composition includes 100 parts by weight of styrene-based resins; 0.5 to 5 parts by weight of a first polyamide resin having a melting temperature (Tm) of 230° C. or less; and 0.5 to 10 parts by weight of a second polyamide resin having a melting temperature (Tm) of 250° C. or more. Both the first and second polyamide resins have a relative viscosity of 2.5 or less. The present disclosure advantageously provides a low-gloss thermoplastic resin composition having excellent aesthetics, such as softness, luxuriousness, and naturalness, due to uniform and low gloss, and improvement in surface texture while having mechanical properties and processability equal or superior to those of conventional ASA resins; and an exterior material including the low-gloss thermoplastic resin composition.

The invention discloses a fire-resistant and flame-retardant nylon composition as well as a preparation method and application thereof, the nylon composition comprises the following components in parts by weight: 28-60 parts of aliphatic nylon resin, 4-15 parts of semi-aromatic nylon resin, 18-32 parts of glass fiber, 12-21 parts of hypophosphite, 3-9 parts of a flame-retardant synergist and 1-4 parts of a carbon formation accelerator, the mass ratio of the hypophosphite to the flame retardant synergist is (2-4): 1; the relative viscosity of the aliphatic nylon resin is 2.6 to 2.9; the carbon forming accelerant is rare earth oxide or zinc stannate. The organic phosphine flame-retardant nylon composition disclosed by the invention has excellent flame retardant property and fire resistance and also has high mechanical property.

This application discloses an MCA flame-retardant black polyamide composite material capable of high-definition laser marking. The composite material comprises the following components, by weight: 50-74 parts nylon resin; 20-40 parts glass fiber; 5-13 parts MCA flame retardant; 0.1-0.5 parts carbon black; 0.2-0.6 parts lubricant; 0-0.5 parts antioxidant; one or both of PA6 and PA66 with a relative viscosity of 2.0-2.4 for the nylon resin; and an average particle size of 5-10 μm for the MCA. This application selects a low-viscosity nylon resin to ensure excellent processing fluidity. The selected formulation components improve the uneven dispersion problem that occurs when MCA and carbon black are used together, reduce the adverse effects of the MCA lubrication on carbon black dispersibility, and enhance the material's flame retardancy and high CTI performance. This results in improved high-definition black-on-white laser marking performance while maintaining good flame retardancy and high CTI. This application achieves high-definition black-on-white laser marking without the addition of expensive laser marking agents, graphene, etc., resulting in low cost.

The invention discloses a nylon composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The nylon composite material provided by the invention comprises the following components in parts by mass: 38-68 parts of nylon, 18-42 parts of glass fibers, 13-25 parts of a halogen-free flame retardant and 1-6 parts of a toughening agent, the nylon comprises at least one of PA6 and PA66, and the relative viscosity of the nylon is greater than or equal to 2.3; in the glass fiber, the mass percent of calcium oxide is less than or equal to 11.5%; the toughening agent comprises at least one of an ethylene-methacrylic acid-acrylate terpolymer and an ethylene-acrylic acid copolymer. The nylon composite material provided by the invention has excellent flame retardant property, deflection and low-temperature toughness.

The invention discloses a polyamide elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. By reasonably controlling the covalent connection rate of the soft and hard sections of the polyamide elastomer and the types of the soft sections and the hard sections of the polyamide elastomer, the obtained polyamide elastomer is high in relative viscosity and excellent in mechanical property, rebound resilience, fatigue resistance and the like, and is suitable for preparing sports equipment, hoses, medical instruments and sealing materials.

Provided is a polyamide resin composition which has high fluidity and excellent hydrogen barrier properties when formed into a molded article, and which does not impair flexibility in a low-temperature environment. A polyamide resin composition for a molded article that is in contact with high-pressure hydrogen gas, the polyamide resin composition containing (A) an aliphatic homopolymerized polyamide resin, (B) an aliphatic copolymerized polyamide resin, and (C) at least one compound selected from the group consisting of C18-32 fatty acids and derivatives thereof as an optional component, the polyamide resin composition does not substantially contain a polyolefin resin. The relative viscosity of (A) is 1.80-2.70, the relative viscosity of (B) is 2.90-4.20, the relative viscosity of a mixture of (A) and (B) is 2.30-3.60, the total of (A) and (B) is 93.0-100% by mass, (C) is 0-2.0% by mass, and other components are 0-5.0% by mass, and the ratio of (A) to (B) is 50: 50-90: 10 on a mass basis.

Disclosed in the present application is a MCA flame-retardant black polyamide composite material capable of high-definition laser marking, which comprises the following components in parts by weight: 50-74 parts of a nylon resin, 20-40 parts of glass fibers, 5-13 parts of a MCA flame retardant, 0.1-0.5 part of carbon black, 0.2-0.6 part of a lubricant, and 0-0.5 part of an antioxidant, the nylon resin being one or two of PA6 and PA66 of which the relative viscosity is 2.0-2.4, and the average particle size of MCA being 5-10 μm. The present application applies the low-viscosity nylon resin, thus ensuring excellent processing flowability; by means of selecting the components in the formula, the problem of non-uniform dispersion during combination use of MCA and carbon black is solved, thus reducing the adverse effect on carbon black dispersity caused by the lubricating effect of MCA, and improving the flame retardance and high CTI performance of the material. Therefore, the present application achieves better high-definition black-on-white laser marking performance while keeping good flame retardance and high CTI. In addition, the present application does not need adding an expensive laser marking agent, graphene and the like for achieving the high-definition black-on-white laser marking and therefore has a low cost.

The invention relates to the technical field of high polymer materials, and discloses high-fluidity nylon resin and a preparation method thereof. The high-fluidity nylon resin comprises aliphatic amide salt and an accelerant, wherein the accelerant is one or a mixture of more of chemicals such as unit acid, binary acid, polybasic acid, unit amine, diamine and polyamine. According to the high-flowability nylon resin disclosed by the invention, the accelerant is added, and a polyamide macromolecular chain is changed from a linear shape into a wound spherical shape through molecular structure design, so that the flowability of the resin is greatly improved under the condition of keeping the high molecular weight of the resin, namely the same level of the relative viscosity of the resin.

The invention belongs to the technical field of high polymer materials, and particularly relates to nylon powder as well as a preparation method and application thereof. The nylon powder comprises high-viscosity nylon resin, low-viscosity nylon resin and an auxiliary agent, the relative viscosity of the high-viscosity nylon resin is 1.75-1.85, and the relative viscosity of the low-viscosity nylon resin is 1.55-1.65; the mass ratio of the high-viscosity nylon resin to the low-viscosity nylon resin is 10: (1-3); the auxiliary agent comprises an antioxidant. The high-viscosity nylon resin with specific viscosity and the low-viscosity nylon resin with specific viscosity are compounded in proportion for use, the high-viscosity nylon resin serves as a framework of a hydrogen storage bottle inner container and provides mechanical property support, and the low-viscosity nylon resin provides fluidity and ensures that a finished bottle has few defects. The mechanical property of the hydrogen storage cylinder liner and the integrity of the liner structure are improved, and the nylon IV type hydrogen storage cylinder liner with high stability and few defects is prepared.

A composite material with high strength and corrosion resistance comprises a composite nylon base material and a composite reinforcing base material which are mixed together, the composite nylon base material is provided with a first nylon material and a second nylon material, the relative viscosity of the first nylon material ranges from 3 to 4, the relative viscosity of the second nylon material ranges from 2 to 3, and the relative viscosity of the composite reinforcing base material ranges from 2 to 3. The composite reinforced base material comprises glass fibers and inorganic additives, the invention provides an industrial product with high strength and corrosion resistance, the industrial product is formed by extruding the composite material, and the inorganic additives are randomly filled in pores between the glass fibers and the composite nylon base material. Therefore, the industrial product with high strength and corrosion resistance uses the combination of the engineering plastic and the reinforcing base material, has excellent corrosion resistance and weather resistance, and can achieve the effects of improving the processing smoothness and the surface flatness of the product.

The invention relates to the technical field of polyester material production, and discloses a polymerization method and system for producing chinlon 6 slices, and the provided chinlon 6 slices have the advantages of higher relative viscosity, narrower molecular weight distribution, lower water content, and higher yield. According to the system used by the invention, a ZnO / Al2O3 composite variable active catalyst adding window is directly arranged at the bottom of the melting and mixing unit 1, so that the ZnO / Al2O3 composite variable active catalyst can be ensured to be more uniformly dispersed in the whole reaction system, the reaction conditions are optimized, the variable active catalyst is adopted, the pH is dynamically regulated and controlled, and the reaction efficiency is improved. The exposure degree of active sites of the catalyst can be accurately adjusted according to the requirements of different stages of a polymerization reaction, generation of cyclic dimers in the caprolactam hydrolysis ring-opening process is effectively inhibited in the pre-polymerization stage, the content of cyclic by-products is remarkably reduced to 3.5% or below, the monomer utilization rate is increased, increase of the molecular weight is promoted in the post-polymerization stage, and the yield of the catalyst is increased. And product quality.

A resin composition contains from 50 to 99 parts by mass of a polyethylene terephthalate resin and from 50 to 1 part by mass of a polyamide resin, wherein the polyamide resin is a copolymer containing a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, 70 mol % or higher of the diamine-derived structural unit is derived from xylylenediamine, from 65.0 to 95.0 mol % of the dicarboxylic acid-derived structural unit is derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 8 carbons, from 35.0 to 5.0 mol % of the dicarboxylic acid-derived structural unit is derived from an α,ω-linear aliphatic dicarboxylic acid having from 9 to 12 carbons, and the polyamide resin has a relative viscosity of from 1.7 to 2.5.

The invention relates to the technical field of bio-based polyamide modification, and discloses a bio-based polyamide modified raw material composition for improving the surface hairiness distribution of bunchy yarn, which comprises the following components in percentage by mass: 2.5-6.0% of bio-based polyamide 1010 resin, 0.5-2.0% of maleic anhydride grafted castor oil polyether with the weight-average molecular weight of 3500-5500g / mol, 0.5-2.0% of maleic anhydride grafted castor oil polyether with the weight-average molecular weight of 3,500-5,500 g / mol, 0.5-2.0% of maleic anhydride grafted castor oil polyether with the weight-average molecular weight of 3,500-5,500 g / mol, the functional components are driven to migrate to a surface layer and generate interface secondary bonding by utilizing reaction activity and temperature drop rate coupling among the components and a temperature drop rate difference generated corresponding to an axial variable cross section of the slub yarn, and a thickness heterogeneous interface layer is spontaneously constructed at slubs and details; the technical contradiction that a homogeneous modified material cannot be matched with a non-uniform thermal field is solved, and the physical integrity of the fiber surface is improved.

A resin composition which contains 10-300 parts by mass of reinforcing fibers per 100 parts by mass of a xylylenediamine-based polyamide resin that contains a diamine unit and a dicarboxylic acid unit, the diamine unit containing 70 mol% or more of a constituent unit derived from xylylenediamine, and the dicarboxylic acid unit containing 70 mol% or more of a constituent unit derived from xylylenediamine. The dicarboxylic acid unit contains 70 mol% or more of a structural unit derived from an alpha, omega-linear aliphatic dicarboxylic acid having 11 to 20 carbon atoms, and the xylylenediamine polyamide resin has a relative viscosity of 1.6 to 2.4.

The invention provides a polyamide composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polyamide composition is prepared from the following components in parts by weight: 30 to 70 parts of semi-aromatic polyamide, 16 to 20 parts of flame retardant, 15 to 50 parts of reinforcing filler, 0.5 to 2 parts of copolymer containing glycidyl methacrylate and 0.5 to 1 part of amino silicon dioxide microspheres, the relative viscosity of the semi-aromatic polyamide is 1.7 to 2.4. According to the semi-aromatic polyamide composition, the copolymer containing glycidyl methacrylate and the amino silicon dioxide microspheres are added into the semi-aromatic polyamide with specific relative viscosity, and the foaming resistance of the polyamide composition is improved through the synergistic effect.

The application belongs to the technical field of polymer materials, and particularly relates to a nylon powder and a preparation method and application thereof. The nylon powder comprises high-viscosity nylon resin, low-viscosity nylon resin and an additive, wherein the relative viscosity of the high-viscosity nylon resin is 1.75-1.85, the relative viscosity of the low-viscosity nylon resin is 1.55-1.65, the mass ratio of the high-viscosity nylon resin to the low-viscosity nylon resin is 10:1-3, and the additive comprises an antioxidant. The high-viscosity nylon resin and the low-viscosity nylon resin with specific viscosities are compounded and used in proportion, the high-viscosity nylon resin serves as a skeleton of a hydrogen storage bottle inner container and provides mechanical property support, and the low-viscosity nylon resin provides fluidity and ensures few defects in bottle forming. The use of the nylon powder of the application improves the mechanical property of the hydrogen storage bottle inner container and the integrity of the inner container structure, and a stable and defect-free type IV nylon hydrogen storage bottle inner container is prepared.

This invention relates to a renewable polyamide 56 fiber, its preparation method, and its application. The raw materials for its production include at least a tackifying renewable polyamide 56 resin. The relative viscosity of the tackifying renewable polyamide 56 resin is 2.4-2.9, and its crystallization temperature is 180-210℃. This invention uses a tackifying renewable polyamide 56 resin obtained by tackifying a recycled polyamide 56 resin produced from recycled polyamide waste fibers and waste fabrics as a raw material. This not only enables the production of fibers with mechanical and dyeing properties comparable to conventional polyamide 56 fibers but also achieves the goal of recycling polyamide waste.

The invention discloses a PP / PA composite material as well as a preparation method and application thereof. The PP / PA composite material comprises the following components in parts by weight: 50-80 parts of PA resin; 20 to 50 parts of PP resin; 10 to 30 parts of modified carbon fiber; wherein the relative viscosity of the PA resin is 2.38-2.8, and the melt flow rate of the PP resin under the conditions of 230 DEG C and 2.16 kg is 40-85 g / 10 min; the molar content of silicon on the surface of the modified carbon fiber is greater than or equal to 7%. According to the PP / PA composite material and the preparation method thereof, the modified carbon fibers with the surface silicon element content larger than or equal to 7% are added into a PP / PA system, the melt flow rate of PP resin and the relative viscosity of PA resin are adjusted, so that the system is easier to build a perfect network, and the prepared PP / PA composite material has good electromagnetic shielding effectiveness and meanwhile has good dry and wet mechanical properties.

The application discloses a glass fiber reinforced flame-retardant polyamide composite material, which comprises the following components in parts by weight: polyamide resin 49-61 parts; glass fiber 19-51 parts; brominated polystyrene high polymer 2.9-8.1 parts; brominated polystyrene oligomer 6.9-18.1 parts; flame-retardant synergist 2.9-8.1 parts; the weight average molecular weight of the brominated polystyrene high polymer ranges from 180,000 to 250,000; the weight average molecular weight of the brominated polystyrene oligomer ranges from 4,000 to 8,000; the relative viscosity of the polyamide resin ranges from 2.0 to 2.7; the average retention length of the glass fiber ranges from 250 to 350 microns, and the average diameter ranges from 6 to 12 microns. The application can realize good melt flow stability and improve crystallinity by compounding the polyamide resin with specific viscosity and the brominated polystyrene with specific different molecular weights, so that the glass fiber reinforced composite material has good size stability after injection molding and has a flame-retardant effect of 1.6 mm.

The preparation method comprises the following steps: preheating caprolactam, mixing the preheated caprolactam with a branched monomer, an anti-gelling agent, a molecular weight regulator and deionized water to obtain a mixed solution, carrying out a pre-polymerization reaction on the mixed solution to obtain a prepolymer, carrying out a post-polycondensation reaction on the prepolymer to obtain a melt polymer, and carrying out high-melt-strength nylon 6 on the melt polymer to obtain the high-melt-strength nylon 6. The high-melt-strength nylon 6 is prepared through the in-situ continuous polymerization technology, the use amount of the branched monomer is controlled, the high-melt-strength nylon 6 can be prepared without the step of polycondensation after a solid phase or liquid phase tackifying, and the high-melt-strength nylon 6 can be prepared through the in-situ continuous polymerization technology without the step of polycondensation after the solid phase or liquid phase tackifying. The high-melt-strength nylon 6 is prepared through one-step continuous polymerization; compared with conventional solid-phase post-polycondensation or liquid-phase tackifying linear ultrahigh-viscosity nylon 6, the linear ultrahigh-viscosity nylon 6 is simpler in preparation process, lower in production cost, lower in relative viscosity, free of gel and wide in application field under the conditions that the product quality is equivalent in mechanical property and similar in melt strength.

To provide a multilayer container including a two-color molding article e, a method for producing a two-layer preform, and a method for producing the multilayer container. The multilayer container including a two-color molding article, the two-color molding article including: an outer layer containing a polyester resin; and an inner layer containing a polyamide resin and being in contact with the outer layer, wherein the polyamide resin has a relative viscosity of 1.8 to 2.8.

The invention belongs to the technical field of high polymer materials, and relates to a microwave solid-phase polyamide tackifying method and application. The microwave solid-phase polyamide tackifying method comprises the following steps: putting solid-phase polycondensation raw materials including polyamide and an optional chain extender into a sealable container, and carrying out microwave irradiation on the solid-phase polycondensation raw materials in a protective atmosphere or a low-pressure environment under a mixing condition to obtain tackified polyamide, wherein in the microwave irradiation process, heat preservation is conducted for 30 min or above from the crystallization temperature to the melting temperature of the solid-phase polycondensation raw materials. The solid-phase polyamide and the optional chain extender are subjected to microwave radiation, solid-phase tackifying of the polyamide is realized through a simple method, and the relative viscosity increase value of the polyamide is not less than 0.2 after microwave radiation for not less than 30 minutes.

The invention provides a method for slicing anionic polymerization fiber-grade nylon 6, and belongs to the technical field of chemical preparation. The method comprises the following steps: respectively pouring materials into corresponding reactors, heating, carrying out vacuum dehydration, feeding into a mixing reactor, heating, melting, stirring and devolatilizing after the reaction is completed, and drafting the melt to prepare slices. The technological process is simple, the product quality is stable, the relative viscosity of the obtained nylon 6 slices is 2.8-3.1, the molecular weight distribution is 1.8-2.0, the conversion rate is 98%, and the nylon 6 slices can be directly used for melt spinning without aftertreatment, so that the anionic polymerization nylon 6 breaks through the traditional casting molding field and can be applied to various melt processing environments.

A drawn polyamide (preferably PA66) high toughness yarn having a relative viscosity (RV) of about 90 to about 200 and comprising PA66 characterized by a molecular weight distribution (Mz / Mw) in the range of > = 1.40 and < = 1.50 + / -0.03. The yarn is useful for a variety of end uses, including tire cords. The yarn provides improved fatigue resistance and / or in-rubber cure strength.

This invention belongs to the field of nylon polymers and discloses a low-temperature preparation method for high-temperature resistant semi-aromatic polyamide, including the following steps: (1) Weigh diacid, diamine, antioxidant, catalyst and deionized water according to the designed molar number, add the raw materials to a high-temperature and high-pressure polymerization reactor, the predetermined temperature of the polymerization reactor is 190-230℃, the pressure is raised to the first predetermined pressure of 1.2-2.6MPa, and the temperature and pressure are maintained for 0.5-3h. The pressure inside the reactor is gradually reduced to the second predetermined pressure of 0.5-1.0MPa by venting, and the venting time is 0.5-3h. Finally, the prepolymer is sprayed out from the bottom of the polymerization reactor to obtain a loose porous dry powder / small particle prepolymer, and there is no prepolymer residue in the reactor; (2) The prepolymer obtained above is subjected to solid-phase post-polymerization in a solid-phase post-polymerization reactor to obtain a high-temperature resistant semi-aromatic polyamide final polymer with a relative viscosity of 2.0-5.0. The method of this invention is suitable for preparing high-temperature resistant semi-aromatic polyamides with different compositions. The resulting prepolymer has a loose and porous powder / small particle structure, which provides a favorable channel for the discharge of water molecules, a byproduct of the solid-state polymerization reaction. This can significantly improve the efficiency of solid-state polymerization, shorten the polymerization time, and reduce energy consumption.

The application belongs to the technical field of polyamides, and particularly relates to a solid-phase viscosity-increasing method for semi-aromatic polyamides. The method comprises the following steps: (1) mixing dicarboxylic acid monomers, diamine monomers, water, a catalyst and a metal compound to perform a salt formation reaction, and then heating to 200-270 DEG C to perform a polymerization reaction, so as to obtain a polyamide resin melt with a relative viscosity of 1.9-2.55; and (2) adding an ester of dicarboxylic acid to the polyamide resin melt, uniformly mixing, and then heating to 175-235 DEG C to perform a solid-phase viscosity-increasing treatment, until the relative viscosity reaches 2.9-3.8, so as to obtain the semi-aromatic polyamide. According to the method, the ester of dicarboxylic acid and the metal compound are introduced, the occurrence of a gel side reaction is significantly inhibited, the solid-phase viscosity-increasing reaction is ensured to maintain a high efficiency, and thus the semi-aromatic polyamide resin with a high relative viscosity and without gel is obtained.

The application discloses a fire-resistant and burn-resistant nylon composition and a preparation method and application thereof. The nylon composition comprises the following components in parts by weight: 28-60 parts of aliphatic nylon resin, 4-15 parts of semi-aromatic nylon resin, 18-32 parts of glass fiber, 12-21 parts of hypophosphite, 3-9 parts of flame-retardant synergist, and 1-4 parts of carbonation promoter, wherein a mass ratio of the hypophosphite to the flame-retardant synergist is (2-4) to 1; a relative viscosity of the aliphatic nylon resin is 2.6-2.9; and the carbonation promoter is rare earth oxide or zinc stannate. The organic phosphorus flame-retardant nylon composition has excellent flame-retardant performance and fire-resistant performance, and can also have high mechanical performance.

The invention relates to the technical field of textile chemical fiber production, in particular to a production method of chinlon 66 industrial yarn and the chinlon 66 industrial yarn, and the production method comprises the following steps: step 1, performing tackifying treatment on chinlon 66 raw material slices to obtain high-viscosity chinlon 66 slices with formic acid relative viscosity of 75-93; step 2, carrying out humidifying treatment on the high-viscosity chinlon 66 slices obtained in the step 1; 3, the high-viscosity chinlon 66 slices obtained in the step 2 are subjected to melt compression, and chinlon 66 melt is prepared; 4, quantitatively feeding the chinlon 66 melt into a spinning assembly, spraying the chinlon 66 melt through the spinning assembly to form chinlon 66 nascent fibers, and then cooling the chinlon 66 nascent fibers; 5, the cooled nylon-66 nascent fiber is sequentially subjected to oiling, stretching, sizing and winding, and then the nylon-66 industrial yarn is obtained. The invention aims to solve the problem that the industrial yarn produced by the existing production method of the chinlon 66 industrial yarn has higher broken filaments and wool balls.