187 results about "Heat deflection temperature" patented technology

The invention belongs to the technical field of nylon materials, and particularly relates to a high-heat-resistance halogen-free flame-retardant nylon material and a preparation method thereof. According to the invention, PA6 and PA66 base materials are compounded by utilizing the high heat resistance of PA66 and the processability advantage of PA6, and the heat deformation temperature of the material is improved through the synergistic effect of the modified glass fiber reinforcing agent and the antioxidant, so that the heat-resistant requirements of high-end scenes such as new energy automobile battery components and high-temperature electronic components are met. Halogen flame retardants are completely abandoned, the modified halogen-free flame retardant is adopted, the flame retardant effect is achieved, meanwhile, no harmful halogen hydride gas or dioxin is released during combustion, and the material still keeps excellent rigidity and toughness on the basis of high flame retardance and high heat resistance and is suitable for popularization and application. The problem that the mechanical property of a traditional halogen-free flame retardant is reduced due to high addition amount is solved.

The invention relates to the technical field of polymeric membrane materials, in particular to a functional packaging membrane material and a preparation method thereof. The packaging film material is prepared from PET, PLA, a modifier and an ultraviolet absorbent, wherein the modifier is formed by grafting dimethyl terephthalate, ethylene glycol and dihydroxyl-terminated polylactic acid to the surface of carboxylated graphene after ester exchange. Under the synergistic effect of the carboxylated graphene nanosheets and the modifier, the uniform dispersion and interface bonding strength of the nanofiller are effectively improved, so that the compatibility of PET (Polyethylene Terephthalate) and PLA (Polylactic Acid) is optimized. According to the structural design, the comprehensive performance such as tensile strength, toughness, gas barrier property and thermal deformation temperature of the composite material can be remarkably improved, and meanwhile, good processability and degradability of the material are guaranteed. The invention provides reliable technical support for developing a novel green packaging film material with high performance and low environmental burden, and has wide industrial application prospect.

The invention provides a high-flame-retardant burnthrough-resistant PC alloy and a preparation method thereof. The PC alloy comprises the following components: branched PC resin with a special blocking rate, 4-10 parts of aryl p-toluenesulfonate and glycidyl ester, wherein the blocking rate of the branched PC resin is 85-95%. The heat resistance, melt strength and burnthrough resistance of the PC alloy are remarkably improved, the heat deformation temperature is increased to 132 DEG C from 122 DEG C, the needle flame S.2 burnthrough time is increased to 150 s or above from 15 s, high flame retardance and burnthrough resistance of a PC product are achieved, and meanwhile the original mechanical performance and thermal performance of PC resin are not affected.

The invention relates to the technical field of polymer optical materials, in particular to an optical-grade polymethyl methacrylate material and a preparation method thereof, and the optical-grade polymethyl methacrylate material comprises the following raw materials in parts by weight: 95-105 parts of methyl methacrylate, 200-240 parts of a composite liquid medium, 1.5-2.5 parts of a composite additive and 0.08-0.12 part of an initiator. According to the invention, the composite additive is used as a main material and the composite liquid medium is used as an auxiliary material, so that the heat resistance and the size stability of the material are synergistically improved, powder in the composite additive is uniformly dispersed in a methyl methacrylate matrix to form a compact physical support skeleton, and the powder is matched with a treating agent and a methyl methacrylate molecular chain to form strong chemical bond combination; the composite liquid medium optimizes the flowability of a polymerization system, reduces polymerization internal stress residues, avoids material deformation caused by internal stress release at high temperature, and enhances high-temperature stability.

The application discloses a large-current aluminum alloy conductor polypropylene insulated medium-voltage power cable and belongs to the technical field of cable preparation, which is used to solve the technical problem that the shielding performance and heat dissipation performance of the polypropylene insulated power cable in the prior art need to be further improved. The polypropylene insulated power cable prepared by the application introduces modified core-shell carbon-nitrogen bodies and silicon-oxygen-nitrogen polypropylene into a polypropylene insulation layer, and a nucleating agent is used to regulate the crystalline structure. The modified core-shell carbon-nitrogen bodies improve the interface heat conduction and charge distribution, the silicon-oxygen-nitrogen polypropylene enhances the chain segment stability and crystalline compactness, and the nucleating agent makes the matrix form a uniform microstructure. Through the structure design, the cable insulation layer maintains a high level in terms of heat distortion temperature, thermal conductivity and volume resistivity, and at the same time, good electromagnetic shielding efficiency is realized, and the heat resistance, thermal conductivity and insulation performance are comprehensively improved.

The invention relates to the technical field of high-performance pipe preparation, in particular to a heat-resistant Krah pipe and a preparation method thereof. The ultrahigh-density polyethylene composite material is prepared from ultrahigh-density polyethylene, polyaryletherketone, boron nitride-silicon carbide nanowire-graphene three-dimensional network filler, a maleic anhydride grafted ethylene-octene copolymer, organic montmorillonite, silane coupling agent modified carbon fibers, a composite antioxidant and a lubricant. The three-dimensional network filler is prepared by carrying out hydroxylation on graphene, modifying with a silane coupling agent, and reacting with aminated boron nitride nanosheets and silicon carbide nanowires under the action of a cross-linking agent; the modified carbon fiber is obtained by ultrasonic treatment of a silane coupling agent solution and high-temperature drying. Through the innovative formula and process, the heat deformation temperature of the Krah pipe exceeds 280 DEG C, the ring stiffness reaches 18 kN / m or above, the elongation at break reaches 300% or above, and the chemical resistance is improved; the gradient cooling process controls the longitudinal shrinkage rate to be smaller than 1%, the production cost is reduced, and the advantages of high temperature resistance, extrusion resistance, long service life and economical efficiency are achieved.

The invention relates to the technical field of full mold casting, and provides an evanescent mode dry sand negative pressure molding process, EPS particles are doped with nanometer silane modified silicon dioxide with the mass percentage being 0.5% of that of the EPS particles, so that the strength of a foam model is improved by 20%, the heat deformation temperature is increased to 80 DEG C, and deformation in the molding and pouring process is reduced. The coating of the bottom layer of the model adopts 20% of bauxite and 5% of carbon fibers to be matched with a water-based binder, so that the air permeability is enhanced, and the coating of the surface layer of the model adopts 60% of emery and 10% of silica powder to be matched with a water-based binder, so that the fire resistance is improved. Pre-jolt ramming and main jolt ramming are carried out after sand filling, so that the compactness uniformity of dry sand is improved to 95% or above; sealing is carried out, main vacuumizing and auxiliary vacuumizing are carried out, the vacuum degree sealing performance during pouring is guaranteed, then pouring forming is carried out, and the vacuum degree is monitored in the pouring process, so that the stability of the vacuum degree in the pouring process is guaranteed; and finally cooling and releasing negative pressure to obtain the casting.

The invention discloses a PC (polycarbonate) composition and a preparation method and application thereof, and belongs to the technical field of high polymer materials, the composition is compounded by introducing cellulose nanocrystals and sulfone polymers into PC resin, so that the chemical resistance of a product can be effectively improved, the product can still maintain stability after being in contact with various organic components, and the stability of the product is improved. Meanwhile, the high and low temperature resistance is remarkably improved, the toughness retention rate of the product at low temperature is high, the thermal deformation temperature is high, and the comprehensive performance is excellent.

The invention provides a polylactic acid composite material and a preparation method thereof, and the preparation method comprises the following steps: levorotatory polylactic acid, dextrorotatory polylactic acid and a compatibilizer are subjected to a reaction to obtain a stereocomplex microcrystal, and the stereocomplex microcrystal and a dynamic cross-linked polyurethane prepolymer are subjected to a blending reaction to obtain the polylactic acid composite material. According to the invention, the toughness and the heat resistance of the polylactic acid composite material are improved by utilizing the dynamic cross-linked polyurethane to cooperate with the stereocomplex microcrystals, and the highest elongation at break can reach 302 + / -15% while the unnotched impact strength of the material is maintained to be greater than or equal to 48 MPa; and the maximum thermal deformation temperature can reach 98.6 DEG C.

The present application discloses a kind of polyethylene terephthalate mixture and its preparation method and application, the polyethylene terephthalate mixture includes the following components: polyethylene terephthalate resin 45-86 parts by weight, toughening agent 0-10 parts by weight, reinforcing agent 10-50 parts by weight, nucleating agent 0.7-10 parts by weight, processing aid 0-3 parts by weight.The nucleating agent includes the combination of long-chain linear saturated lignosulfonate, talcum powder and polyethylene.The forming property of the polyethylene terephthalate mixture of the present application is further improved, the forming cycle is greatly shortened, the mechanical strength, toughness and heat distortion temperature can be maintained relatively high, the application range is further expanded, not limited by color, and can be applied to full-color products.

A method of manufacturing a dual-cured polymer component includes additively manufacturing a green state component from a liquid photopolymerizable material; and dual post-curing the green state component by UV curing and thermal curing such that the dual-cured component is formed. The liquid photopolymerizable material has a composition includes an oligomer with a glass transition temperature greater than about 100° C., a monomer, and a photoinitiator. The thermal curing step is completed in a nitrogen environment to a temperature greater than the glass transition temperature of the oligomer. The dual-cured component has a heat deflection temperature between about 100° C. and 250° C. and an elongation at break between about 5% and 20%.

The utility model discloses a connector, which comprises a connector body, an internal protection part, a middle protection layer and an external protection layer, and is characterized in that the connector body comprises a connector rubber core and a circuit board arranged on the connector rubber core; the internal protection part is encapsulated on the circuit board; the middle protection layer is encapsulated at one end, close to the circuit board, of the internal protection part and the connector rubber core; the external protection layer is encapsulated at one end, close to the circuit board, of the middle protection layer and the connector rubber core; the material thermal deformation temperature of the internal protection part is smaller than that of the middle protection layer, and the material thermal deformation temperature of the middle protection layer is smaller than that of the external protection layer.

The invention provides a composite wear-resistant material. The composite wear-resistant material comprises a supporting layer, a transition layer and a wear-resistant layer which are sequentially stacked, the supporting layer comprises thermoplastic polyetherimide, first reinforced fibers and inorganic filler, the heat deformation temperature of the supporting layer is T1 DEG C, and the compression strength at 150 DEG C is P1 MPa; the transition layer comprises thermoplastic polyimide, thermoplastic polyetherimide and second reinforced fibers, the thermal deformation temperature of the transition layer is T2 DEG C, and the compression strength at 150 DEG C is P2 MPa; the wear-resistant layer comprises thermoplastic polyimide, third reinforced fibers and a solid lubricant, the thermal deformation temperature of the wear-resistant layer is T3 DEG C, the compression strength at 150 DEG C is P3 MPa, the friction coefficient of the wear-resistant layer is 0.18-0.27, the absolute value of the difference between any two of T1, T2 and T3 is within 10, and the absolute value of the difference between any two of P1, P2 and P3 is within 5.

The invention provides an integrated inductor formed based on a magnetic composite material and a winding and a manufacturing method of the integrated inductor. The integrated inductor comprises a main magnetic ring, iron-based nanocrystalline powder and composite powder which are formed in an axial magnetic field orientation mode under the pressure of 500-700 MPa, the winding and an internal gradient layer. The crushed magnetic particle mixture is of a chain structure of Fe-Si-B-Cr amorphous crushed magnetic particles which are directionally arranged in a magnetic field, and the external coating layer is made of a high-thermal-conductivity magnetic composite material. According to the invention, a three-stage magnetic circuit design is formed by the high saturation magnetic induction intensity of the main magnetic ring, the structural support, the magnetic resistance shunt of the transition layer, the stress buffer and the broadband response and thermal management of the coating layer, so that the broadband response of DC-5MHz is realized, and the saturation current is improved; meanwhile, an epoxy resin-cyanate ester-polysulfide rubber composite matrix is subjected to triazine ring crosslinking and elastomer modification, so that the thermal deformation temperature reaches 200 DEG C or above, meanwhile, the interlayer CTE difference is reduced, and the forming yield is increased.

The application discloses a polyolefin resin composition and a preparation method and application thereof, and the polyolefin resin composition comprises the following components in parts by weight: linear PE resin 60-92 parts; HDPE 2-10 parts; and cyclic polyolefin resin 6-30 parts; the content of bicycloheptene in the cyclic polyolefin resin is greater than or equal to 75%, and the heat distortion temperature is greater than or equal to 127 DEG C. The polyolefin resin composition has good extinction effect and is suitable for packaging materials with high extinction effect requirements.

The invention relates to the technical field of polymer thermoelectric composite materials, in particular to a heat tracing band, which comprises an outer insulating layer, a shielding layer, an inner insulating layer and a conductive core band, and is characterized in that the conductive core band comprises two conductive buses arranged in parallel and a PTC (Positive Temperature Coefficient) composite material coating the conductive buses; the PTC composite material comprises the following components in parts by weight: 180-220 parts of carbon black-carbon fiber composite conductive powder, 600-700 parts of linear low density polyethylene, 50-100 parts of an ethylene-octylene copolymer, 2-4 parts of an antioxidant and 1-3 parts of an ultraviolet light absorber. According to the invention, the ethylene-octene copolymer long-chain branch and the linear low-density polyethylene chain segment are entangled to form a special molecular network; at low temperature, linear low-density polyethylene ensures that the structure is stable, and an ethylene-octylene copolymer flexible chain segment absorbs impact and relieves low-temperature brittleness; at high temperature, the molecular chain of the former is anchored by the long-chain branch of the latter, the sliding of the chain segment is blocked, and a proper amount of balance toughening and heat-resisting agent is added, so that the heat deformation temperature is increased, and the material softening is delayed.

A process for manufacturing a dual-cured polymer component involves the additive manufacturing of a raw component from a liquid photopolymerizable material; and dual post-curing of the raw component by UV curing and thermal curing to form the dual-cured component. The liquid photopolymerizable material has a composition comprising an oligomer with a glass transition temperature above approximately 100 °C, a monomer, and a photoinitiator. The thermal curing step is completed in a nitrogen environment up to a temperature higher than the glass transition temperature of the oligomer. The dual-cured component exhibits a heat deflection temperature between approximately 100 °C and 250 °C and an elongation at break between approximately 5% and 20%.

Provided are polymer compositions comprising copolyesters comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) and cyclohexanedimethanol (CHDM) residues which exhibit substantially improved impact toughness and coefficient of friction reduction while physical properties such as heat distortion temperature (HDT) and flexural modulus, after modification, are maintained compared to un-modified compositions.

The present invention provides a food-contact-safe, bacteria-repellent plastic selected from modified thermoplastics, vulcanized silicone rubber, or modified base plastics. The plastic includes an anti-biofouling agent, comprising approximately 0.1 to 20% by weight of the total plastic weight; and one or more of a filler, a carrier, a release agent, a curing agent, and / or an oil component, each comprising approximately 0.1 to 2% by weight of the total plastic weight. The anti-biofouling agent forms a hydrated layer on the plastic that repel bacteria, including Escherichia coli and Staphylococcus aureus. After combining the anti-biofouling agent and one or more other components, the plastic's optical and mechanical properties, including light transmittance, tensile strength, impact strength, hardness, and / or heat distortion temperature, change by less than 10%.

The invention relates to the technical field of high-temperature-resistant polyester composite materials, in particular to a high-temperature-resistant polyester composite material and a preparation method thereof.The high-temperature-resistant polyester composite material is prepared from polyester resin, a brominated flame retardant, a synergistic flame retardant, an antioxidant A, a lubricant A, irradiation master batches and glass fibers. The irradiation master batch promotes the cross-linking reaction of the polyester resin to form a three-dimensional network structure; the glass fiber is used as a reinforcing material and has a synergistic effect with the irradiation master batch, so that the mechanical strength, the heat resistance and the dimensional stability of the polyester composite material are remarkably improved, the sliding of a polyester molecular chain is limited, the thermal deformation is reduced, and the thermal deformation temperature of the polyester composite material is jointly improved. After being subjected to special irradiation treatment, the material has higher heat deformation temperature and lower melt flowability, can bear an SMT process without deformation, bubbling or collapse, has remarkable long-term heat resistance, and can bear continuous high temperature without softening deformation.

The invention discloses an epoxy automatic pressure gel resin material as well as a preparation method and application thereof. The epoxy automatic pressure gel resin material is prepared from the following raw materials in parts by weight: 80 to 120 parts of epoxy resin, 50 to 90 parts of anhydride curing agent, 300 to 350 parts of silicon dioxide, 10 to 50 parts of aluminum hydroxide and 1 to 3 parts of interfacial agent, wherein the particle size of the aluminum hydroxide is 0.5-5 [mu] m. The material prepared from the preparation raw materials has an excellent flame-retardant effect and better electrical performance and thermal performance, can meet the requirements of high-voltage insulation (2.12 * 10 < 15 >-4.81 * 10 < 15 > omega.cm), low energy loss (dielectric loss tangent 0.0105-0.0138) and high-temperature stability (Tg is 98.17-104.55 DEG C, and the thermal deformation temperature is 88.3-95.7 DEG C), and can be used for preparing the high-voltage-resistant flame-retardant material.

The application discloses a photosensitive resin composition and a preparation method thereof, and particularly relates to the technical field of electronic chemicals. In view of the fact that traditional photosensitive resin is difficult to balance the bending performance and heat resistance, the composition is composed of photosensitive resin, photoinitiator, filler, flame retardant and additive. The core lies in that rigid-flexible synergistic design is performed on polyimide and polyurethane acrylate, and the interface adhesion is enhanced in combination with epoxy resin. In the preparation, a process flow of high-temperature dissolution, medium-temperature mixing, fineness control and segmented curing is adopted. The test shows that the adhesion of the prepared resin composition reaches 5B level, the flame retardant level is V-0, the heat distortion temperature is as high as 185 DEG C, and the bending resistance times are more than 10,000 times. The application realizes synchronous improvement of mechanical flexibility and heat stability without sacrificing photosensitivity, has obvious progressiveness, and is particularly suitable for the fields of flexible electronics and high-end packaging.

The embodiment of the invention discloses a high-temperature-resistant nylon composite material and a preparation method thereof. The material comprises semi-aromatic nylon, a toughening agent and copper salt, the flexibilizer comprises a maleic anhydride grafted flexibilizer, and the copper salt comprises copper salt particles with smooth surfaces. Melting and dispersing the toughening agent at 200-220 DEG C; and mixing the molten toughening agent, the semi-aromatic nylon and the copper salt at the temperature of 270-310 DEG C. According to the embodiment of the invention, the specific flexibilizer is selected, so that the tensile strength is ensured on the premise of ensuring the impact strength and the tensile fracture strain, and meanwhile, the influence on the thermal deformation temperature is reduced to the minimum; meanwhile, copper salt particles with smooth surfaces are screened, so that copper salt agglomeration is effectively reduced, adverse effects of the copper salt on fibers are avoided, toughening and thermal stability are achieved, and the high-temperature nylon composite material is high in toughness, good in processing fluidity, high in thermal deformation temperature and excellent in long-acting thermal stability.

The application designs and synthesizes a nucleating agent with good compatibility with recycled polyethylene terephthalate. The nucleating agent can effectively solve the technical problems of slow crystallization rate and poor heat resistance of recycled polyethylene terephthalate. The nucleating agent is simple to synthesize, has good effect, can effectively improve the crystallization temperature, crystallization rate and heat distortion temperature of recycled polyethylene terephthalate, and further promotes the wide application of recycled polyethylene terephthalate.

This invention relates to the field of polymer molding technology, specifically to a high-temperature resistant, dimensionally stable acrylic sheet and its preparation and shaping process, comprising the following components: 80-95 parts by weight of polymethyl methacrylate matrix resin, 5-20 parts by weight of isoborneol methacrylate, 2-6 parts by weight of nano-silica, 0.4-1.2 parts by weight of silane coupling agent, 0.2-0.6 parts by weight of initiator, 0.5-1.5 parts by weight of crosslinking agent, 0.1-0.4 parts by weight of antioxidant, 0.1-0.3 parts by weight of light stabilizer, and 0.05-0.2 parts by weight of release agent. By introducing isoborneol methacrylate as a comonomer into the polymethyl methacrylate matrix, the glass transition temperature of the polymer is significantly increased by utilizing the cyclic rigid groups in its molecular structure. Combined with the reinforcing effect of nano-silica, the high-temperature resistance of the acrylic sheet is significantly improved, with a heat distortion temperature and Vicat softening temperature significantly higher than those of ordinary acrylic sheets.

The invention relates to liquid crystal polyesteramide, a composite material and preparation and application of the liquid crystal polyesteramide and the composite material, bio-based polyamide oligomer is introduced into a liquid crystal polyarylate main chain structure, high-strength thermotropic liquid crystal polyesteramide resin is obtained, and heat resistance and heat distortion temperature are further improved by adding glass fibers. The introduction of bio-based polyamide taking 1, 4-butanediamine as a raw material accords with the strategy of sustainable development, and the introduction of glass fibers effectively improves the mechanical properties and use temperature of the composite material, and the prepared thermotropic liquid crystal polyesteramide and the composite material thereof are suitable for the fields of new energy, aerospace and communication.

The invention discloses a modified PETG material and application thereof in preparation of a heat-resistant container, and the modified PETG material comprises the following raw materials by mass: 80-97% of PETG, 0.5-5% of a phthalazinone diphenol monomer, 0.5-5% of a styrene-maleic anhydride copolymer, 1-3% of a compatilizer, and 1-2% of nano-silica. Wherein acid anhydride in the styrene-maleic anhydride copolymer can be subjected to a ring-opening esterification reaction with phenolic hydroxyl groups of the phthalazinone diphenol monomer, and the formed cross-linked polymer can endow the modified PETG material with excellent high-temperature resistance (the thermal deformation temperature reaches 130 DEG C or above) and a rigid characteristic (the Young modulus reaches 3 GPa or above); and the nano silicon dioxide is beneficial to improving the good surface hardness (the surface hardness reaches 2H) of the modified PETG material.

The present invention relates to a single-layer or multi-layer extruded, biaxially stretched, and heat-set film. The film comprises a first polypropylene (PP1) and has a thermal deflection temperature greater than 75°C. The film can be used, for example, as a packaging material, particularly for food packaging. The present invention also relates to a method for producing the film and the use of the film, preferably for packaging food.

The invention relates to the technical field of high polymer materials, and discloses a polymethyl methacrylate composition and a preparation method thereof, and the polymethyl methacrylate composition is prepared from the following raw materials in parts by weight: 100 parts of polymethyl methacrylate resin, 0.2-3.2 parts of a Lewis acid center provider, 0.2-3.2 parts of a multifunctional bridging ligand, and 0.1-1.1 parts of a competitive replacement aid. The preparation method comprises the step of carrying out melt blending on the components. According to the invention, through the synergistic effect of the Lewis acid center provider and the multifunctional bridging ligand, a dynamic reversible supramolecular network is constructed in a polymethyl methacrylate matrix, and the structure of the supramolecular network effectively improves the impact toughness, rigidity and thermal deformation temperature of the material. The technical problem that toughness, rigidity, heat resistance and processability of a traditional polymethyl methacrylate material are difficult to consider at the same time is solved, and the polymethyl methacrylate composition with excellent comprehensive performance is prepared.

The invention discloses a method for improving heat resistance of toughened polylactic acid, and belongs to the technical field of polylactic acid material modification.The method comprises the steps that a, a toughened polylactic acid material is provided, the toughened polylactic acid material comprises an MBS / PLA composite material, and the content of MBS in the composite material is 5-15 wt%; and b, placing the toughened polylactic acid material in a crosslinking solution to carry out a crosslinking reaction, and constructing a crosslinked polylactic acid interface layer on the surface of the toughened polylactic acid material through the crosslinking reaction. According to the method, the heat resistance of the toughened polylactic acid composite material can be greatly improved, the heat distortion temperature HDT of the toughened polylactic acid composite material is remarkably improved, meanwhile, the basic toughness of the composite material is kept, the heat resistance improving method of the toughened polylactic acid can be regulated and controlled according to performance requirements, and flexibility is provided for meeting the requirements of different application scenes of the toughened polylactic acid.