722 results about "Melt blending" patented technology

The invention relates to an antistatic MLCC release film base film and a preparation method thereof. The antistatic MLCC release film base film is prepared by melt blending and biaxial stretching of PET master batch, an antistatic composition and a nano filler, wherein the antistatic composition is prepared by compounding modified PET-PEG and thiophene modified aromatic polyamide; the nano filler is prepared by carrying out melt extrusion on KH550 modified talcum powder and MAH-g-PET (maleic anhydride-grafted polyethylene terephthalate). The antistatic composition disclosed by the invention has the beneficial effects that the antistatic composition is formed by interweaving two polymers, and a stable three-dimensional conductive network is constructed in the PET film, so that the antistatic performance is more efficient, lasting and stable. In addition, through chemically bonded modified talcum powder, the smoothness and low roughness are provided, and meanwhile reinforcing and toughening are achieved; and the single-layer extrusion process can realize ultrathin thin film, the production process is simplified, and the production cost is greatly reduced.

The invention provides a method for optimizing the mechanical property of a bio-based composite material based on nano modification, and belongs to the technical field of high-molecular compound compounds.The method includes the steps that wood flour is subjected to silane coupling agent modification pretreatment, a functionalized nano particle dispersion liquid is prepared, the dispersity is evaluated through a graph theory model, and the mechanical property of the bio-based composite material is optimized. The modified wood flour and polyethylene are subjected to melt blending in a twin-screw extruder in proportion, the functionalized nanoparticle dispersion liquid is synchronously added, real-time regulation and control are performed by using an intelligent dispersion optimization model, and the network structure integrity is evaluated through gridding performance indexes. The tensile strength, the bending strength and the impact strength are comprehensively optimized by adopting a multi-objective optimization game model, the process parameters such as the nano-particle addition amount, the mixing temperature and the mixing time are adjusted according to the optimization result, and the optimization is repeated until the preset target values are reached, so that the problems that the nano-particles are non-uniformly dispersed, local stress concentration points are formed, and the stability of the nano-particles is improved are solved. The overall mechanical property is influenced.

The invention discloses a plastic hollow plate and a manufacturing method thereof, the plastic hollow plate comprises the following components by weight: 30%-60% of a polypropylene matrix and 40%-70% of phosphogypsum powder, and polypropylene provides thermoplastic formability and toughness. The preparation method specifically comprises the following steps: 1) pretreating ardealite; 2) melt blending granulation; (3) forming a hollow plate; and 4) post-processing. The ardealite hollow plate has the advantages that the ardealite filling amount is increased, meanwhile, the bending strength and impact strength of a traditional hollow plate are improved, and the performance is improved by 20% or above compared with that of a traditional hollow plate with the same filling amount; the moisture content of the pretreated phosphogypsum is less than 6%, so that bubbles in the processing process are avoided, and the interface bonding strength is improved; the comprehensive utilization rate of industrial byproduct phosphogypsum is improved, and the production cost is reduced.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The invention relates to a composite solid electrolyte and a preparation method and application thereof. The preparation method of the composite solid electrolyte comprises the following steps: S1, mixing an inorganic filler and a fluorine-containing compound, and reacting at 70-90 DEG C under an acidic condition to obtain an inorganic filler wrapped by a fluorinated layer; then adding a fluorine ion complexing agent and a silane coupling agent for reaction to obtain a modified filler; adding a thermal decomposition type cross-linking agent into the polymer, and carrying out melt blending to obtain a cross-linked polymer; s2, uniformly mixing the modified filler, a cross-linked polymer, a lithium salt and a solvent to obtain a plurality of slurries containing the modified filler with different volume concentrations; and molding the slurry to prepare the composite solid electrolyte. According to the method, the fluorinated layer and the siloxane network are constructed step by step, so that the interface impedance is reduced, and efficient dissociation of the lithium salt is promoted; a three-dimensional network structure is combined, so that the tensile strength is improved; the modified filler is further designed in a gradient manner to improve the lithium ion transference number.

The utility model discloses a melt blending extrusion device which comprises a mixing tank and an extrusion assembly, and the extrusion assembly is arranged below the mixing tank; a stirring shaft is arranged in the mixing tank, the first stirring spiral blade is arranged on the stirring shaft, a plurality of rotating shafts are movably connected with the lower part of the stirring shaft in the mixing tank at equal angles, and second stirring spiral blades are arranged on the rotating shafts. In conclusion, the material mixing device overcomes the defects in the prior art, is reasonable in design, can push materials in the middle of the material mixing tank downwards and diffuse the materials outwards, avoids precipitation or layering of the materials in the mixing process, improves the mixing effect, and has high social use value and application prospects.

The invention discloses a high-strength modified high-density polyethylene double-wall corrugated pipe and a preparation method thereof, and relates to the technical field of high-density polyethylene double-wall corrugated pipes. The high-strength modified high-density polyethylene double-wall corrugated pipe is prepared from the following components: high-density polyethylene, ultra-high molecular weight polyethylene, reinforcing filler, a compatilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: reinforcing filler surface modification; all the components are subjected to melt blending to prepare the modified composite material; the modified composite material is subjected to extrusion molding to form the double-wall corrugated pipe; and cooling, shaping and cutting. The UHMWPE and the reinforcing filler are introduced, and the compatilizer is combined to improve interface bonding, so that macromolecular chains of the UHMWPE are entangled to form a tough network, the reinforcing filler provides rigid support, and the high-temperature modulus and creep resistance are synergistically improved; high-temperature oxidative degradation is effectively inhibited through the antioxidant, the slow crack growth resistance time is prolonged, and the service life is prolonged.

The invention relates to the field of high polymer materials, and discloses a high-wear-resistance elastomer sole material and a preparation method thereof.The material comprises an elastomer matrix and surface-modified boron nitride nanosheets; the elastomer matrix comprises a first dynamic network and a second dynamic network which are formed through crosslinking of dynamic covalent bonds, and the first dynamic network and the second dynamic network are based on different types of dynamic covalent bonds and have different dissociation activation energy barriers or external stimulus response conditions. The surface-modified boron nitride nanosheet and the second dynamic network form a selective interface enhancement effect; the preparation method comprises the steps of polymer functionalization, nanosheet surface modification, melt blending reaction net forming, forming and the like. The obtained elastomer sole material not only has excellent wear resistance and mechanical properties, but also can realize self-repair of graded response aiming at damages of different degrees, and the service life of the material is remarkably prolonged.

The invention relates to the technical field of high polymer material processing, in particular to a blow molding method of a composite toughened film, which comprises the following steps: step 1, preheating matrix resin in preheating equipment; 2, feeding the mixed raw materials into a double-screw extruder for melt blending; 3, feeding the dried composite particles into a hopper of a single-screw blow molding extruder; 4, adjusting the air volume and the air pressure of the cooling system according to the monitoring result; and 5, the formed film pipe is folded into a flat shape through a guide component and led out through a traction roller, the traction speed and the extrusion speed are coordinated to control the traction ratio, corona treatment is conducted on the surface of the thin film to improve the surface energy, then rolling tension is controlled for rolling, and the rolling tension is controlled according to the elasticity and thickness of the thin film to prevent excessive stretching or loosening. The uniform distribution and proper compatibility of the composite toughening component improve the toughness of the film, and maintain the strength and barrier property of the film.

The invention relates to a special engineering plastic polyethersulfone microcellular foam material and a preparation method thereof, belongs to the technical field of high polymer material foaming, and solves the problem that high foaming ratio, a microcellular structure and excellent mechanical properties cannot be simultaneously obtained when a macromolecular polyethersulfone material adopts an injection foaming technology in the prior art. The method comprises the following steps: step 1, pretreating raw materials; 2, melt blending: mixing the PES base material, the second component, the functional filler, the cross-linking agent and the foam stabilizer, carrying out melt blending, granulating, and drying to obtain granules; 3, injection foaming: injecting the granules into an injection machine, adding a composite foaming agent into the injection machine, mixing, and performing injection foaming molding to obtain an injection-molded foaming material; and 4, curing: irradiating the injection-molded foam material with rays to obtain the special engineering plastic PES microcellular foam material.

The invention discloses a preparation method of an environment-friendly degradable single-sided perspective sticker, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) preparation of a multi-layer composite structure: mixing polylactic acid and poly (butylene succinate), adding nano-montmorillonite and a surface modifier, and carrying out melt blending to form a first-layer melt; stirring poly (butylene adipate-co-terephthalate) and fluorescent carbon nanodots to form a second layer of melt; the first layer, the pressure-sensitive adhesive layer and the second layer are co-extruded and compounded to form a film blank. And (2) construction of the nano-film: biaxially stretching the film blank, imprinting a micropore array, dipping in the silver nanoparticle suspension, and drying to obtain the nano-film. And (3) coating functionalization treatment: immersing into a fluorine-containing nano coating solution, and curing. And (4) post-treatment: carrying out secondary curing. The obtained single-sided perspective sticker is suitable for the fields of buildings, vehicle privacy films and the like, and solves the problems of serious pollution and slow degradation of a traditional sticker.

The invention relates to the technical field of high polymer material modification and processing, in particular to a modification formula and production process of an impact-resistant and high-heat-resistant MPP cable protection tube, and the formula comprises 60-80 parts of a polypropylene base material, 8-15 parts of a nano-composite reinforcing agent, 5-12 parts of a heat-resistant modifier, 3-8 parts of an impact-resistant modifier and the like. The production process comprises the steps of nanofiller surface functionalization, multi-stage melt blending, dynamic vulcanization forming, pulse type vacuum setting and online detection, and the prepared pipe is excellent in impact resistance and heat resistance and high in size precision. The pipe provided by the invention has the advantages of zero fracture in drop hammer impact, vicat softening temperature of 152 DEG C, ring stiffness of 60.16 kN / m < 2 > and small dimensional deviation; the process improves filler dispersity, has low rejection rate and energy consumption, has comprehensive performance superior to that of traditional products, and is suitable for complex working conditions.

The invention discloses a high transparency and high toughness polyamide fiber preparation method, which comprises: S10: carrying out melt blending on polyamide and an ethylene-alpha-olefin copolymer elastomer, and extruding under the high shear action to obtain a modified melt; s20, the modified melt is extruded through a spinneret plate to form nascent filaments, the nascent filaments are fed into a cooling area to be rapidly cooled, and nascent fibers are obtained; the retention time of the nascent filaments in the cooling area is 0.1-0.3 second, nitrogen is adopted as a cooling medium in the cooling area, and the temperature of the nitrogen is 10-14 DEG C; s30, carrying out hot stretching treatment on the nascent fiber to obtain a stretched fiber; and S40, carrying out heat setting treatment on the stretched fiber to obtain the polyamide fiber. The polyamide fiber prepared by the method has good toughness and relatively high transparency.

The invention relates to the technical field of rubber-plastic composite flame-retardant materials, and provides a graphite rubber-plastic composite flame-retardant material and a preparation method thereof.The preparation method comprises the following processes that nitrile rubber, polyvinyl chloride, dioctyl phthalate, modified expandable graphite, a stabilizer, sulfur and an anti-aging agent are added into a high-speed mixer and mixed to be uniform, and a premix is obtained; and feeding the premix into a double-screw extruder, and carrying out melt blending, extrusion and vulcanization to obtain the composite flame-retardant material. The preparation method has the beneficial effects that the modifier is combined with the expansible graphite and compounded with the nitrile rubber, the polyvinyl chloride and other base materials, so that the flame retardant property and the mechanical property of the prepared composite material are remarkably improved.

The invention relates to the technical field of environment-friendly materials, and discloses a high-strength degradable packaging material and application of the high-strength degradable packaging material in cosmetic packaging materials.The preparation method of the high-strength degradable packaging material comprises the steps that polylactic acid, vanillic aldehyde modified polyester, polyadipic acid, triethyl citrate, calcium stearate and an antioxidant are added into a high-speed mixing machine, and the mixture is stirred to be uniform; mixing at 60 to 80 DEG C for 10 to 20 minutes to obtain a mixed material; the mixed material is subjected to melt blending through a double-screw extruder, the blending temperature is 160-180 DEG C, the screw rotating speed is 250-300 rpm, extrusion granulation and drying are conducted, and the high-strength degradable packaging material is obtained. The high-strength degradable packaging material can be applied to cosmetic packaging materials such as bottle bodies, bottle caps, hoses and packaging boxes. The prepared packaging material is high in mechanical strength and has good degradability and flame retardance.

The invention relates to the technical field of films, in particular to a high-surface tension aluminized base film and a preparation method thereof. The method comprises the following steps: grafting modified fumed silica with a silane coupling agent KH-570, and grafting a ternary polymerization shell layer composed of 2-acrylamide-2-methylpropanesulfonic acid, lauryl methacrylate and glycidyl methacrylate on the surface of the modified fumed silica to obtain organic anti-sticking silica; secondly, synthesizing an aromatic sulfonated polyester prepolymer, loading nano titanium dioxide, and carrying out melt blending extrusion with polypropylene to form polar cluster polypropylene master batches; and finally, blending polypropylene resin, the master batch and maleic anhydride grafted polypropylene, and carrying out melt extrusion, air cooling and slow cooling and two-way stretching molding. The obtained base film is high in surface tension, high in aluminized layer adhesive force, excellent in oxygen and water vapor barrier property, good in thermal stability and suitable for the field of high-end packaging.

The invention discloses a recoverable high-barrier-property multilayer composite film and a preparation method thereof. The composite film adopts a five-layer symmetrical structure, namely a heat sealing layer, a first bonding layer, a blocking layer, a second bonding layer and a surface protection layer. Wherein the barrier layer is a montmorillonite modified ethylene-vinyl alcohol copolymer, and montmorillonite is modified by a carboxyl functionalized ammonium bromide intercalator; the bonding layer is maleic anhydride grafted polylactic acid; the heat sealing layer contains modified composite filler; the surface protection layer is a polyethylene / graphene modified coupling agent composite system. The preparation method comprises the steps of intercalation modified montmorillonite preparation, barrier layer material melt blending, five-layer co-extrusion casting, gradient hot pressing and curing treatment. The problems that a traditional high-barrier film is unrecyclable, the interlayer binding force is weak and the high-temperature stability is poor are solved, the ultrahigh barrier performance that the oxygen transmission rate is smaller than or equal to 0.5 cm < 3 > / (m < 2 >. 24 h) and the water vapor transmission rate is smaller than or equal to 1.0 g / (m < 2 >. 24 h) is achieved, and the mechanical property retention rate is larger than or equal to 85% after recycling and re-pelletizing.

The present invention discloses a self-degradable particle temporary plugging agent for fracturing and its preparation method and application, relating to the field of oilfield chemical technology. According to mass percentage, the temporary plugging agent is obtained by melt blending and crushing the materials including the following components: poly (3-hydroxybutyric acid-co-4-hydroxybutyrate), 70%-85%; auxiliary agent for auxiliary degradation, 2%~10%; nano silicon dioxide 10%~15%; sodium starch glycolate, 1%~7%. The temporary plugging agent of the present invention contains disintegrant sodium starch glycolate, which has a strong water absorption capacity and can quickly absorb water and expand its own volume by 250~300 times, so that the temporary plugging agent expands and cracks appear. On the one hand, in the early stage of plugging, the temporary plugging agent can reduce the gap between particles after absorbing water and expanding, thereby increasing the density of the entire plugging layer, thereby improving the plugging ability. On the other hand, cracks are generated on the surface of the temporary plugging agent after expansion, and water can penetrate into the interior of the temporary plugging agent particles from the cracks, which increases the contact area between the temporary plugging agent and water, thereby promoting its degradation and shortening the time of overall degradation.

The invention relates to the technical field of polymer composite materials, in particular to a polycaprolactone-based composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out surface grafting treatment on nano cellulose to obtain modified nano cellulose; mixing the modified nanocellulose, polycaprolactone and a solvent to obtain slurry; carrying out melt blending and granulation on the slurry to obtain composite granules; and carrying out melt blending and granulation on the composite granules, a metal soap stabilizer and a natural resin derivative to obtain the polycaprolactone-based composite material. The polycaprolactone-based composite material prepared by a novel composite process of nano cellulose graft modification-solvent replacement synergetic melt co-extrusion has the core advantages of high mechanical strength, excellent light transmittance, long-acting weather resistance and the like, is good in processing adaptability and simple and convenient to operate, can realize continuous large-scale production, and remarkably reduces energy consumption and raw material cost.

The invention discloses a recycled modified polypropylene composite material preparation system and a resource recovery method, and relates to the technical field of high polymer material science and engineering. The raw material pretreatment module adopts near infrared spectrum classification, multi-stage cleaning, drying and crushing, and the moisture content is controlled to be less than 0.5%; the melt blending module melts the materials at 180-220 DEG C, modifiers and additives are added, and vacuum degassing is performed to remove impurities; adding a reinforcing agent into the modification reinforcing module, and performing ultrasonic dispersion and dynamic vulcanization; the molding processing module is used for manufacturing a product through extrusion, injection molding or calendaring; the quality detection module is used for detecting mechanical and thermal properties; the waste recovery module is used for crushing and melting granulation to realize a closed loop; the intelligent control module uses a PLC to coordinate each module. Integrated treatment of waste polypropylene is achieved, the purity of raw materials and the performance of a composite material are improved, the resource utilization rate is increased through closed-loop recycling, manual intervention is reduced through intelligent control, product stability is guaranteed, economic and environment-friendly benefits are achieved, and high-valued circulation of waste plastic is promoted.

The invention provides a formaldehyde-removing hot-melt composite elastic material and bedding using the same. The material comprises 60-80 parts of a polymer matrix, 15-25 parts of a formaldehyde catalytic decomposition agent, 5-10 parts of a polarity regulator and 0.5-2 parts of a processing aid, and is formed in one step through melt blending-hot pressing foaming. A polymer matrix is in an island phase state constructed by thermoplastic polyurethane and an ethylene-vinyl acetate copolymer through melt blending, the Shore hardness of 80A-95A and the glass transition temperature smaller than or equal to 30 DEG C are both considered, and low-temperature high resilience is achieved. The catalytic decomposition agent is compounded by MIL-101 (Cr)-NH2 and aminated carbon quantum dots according to a ratio of (3-5): 1, and formaldehyde is continuously oxidized into CO2 and H2O at normal temperature without light. The silane-modified tourmaline is used as a polarity regulator, and particle agglomeration is inhibited and an interface polarization electric field is enhanced through epoxy group covalent bonding. The density of the obtained material is 40-60 kg / m < 3 >, the aperture ratio is larger than or equal to 80%, the air permeability is larger than or equal to 500 L / (m < 2 >. S), and the material is applied to comfortable layers of mattresses, pillows or back cushions and keeps efficient formaldehyde removal and mechanical supporting functions for a long time.

The invention discloses a high-performance polyether-ether-ketone modified sealing material and a preparation method thereof, and relates to the technical field of sealing materials. The high-performance polyether-ether-ketone modified sealing material is prepared from the following raw materials in percentage by mass: 5 to 10 percent of polytetrafluoroethylene micro powder, 5 to 10 percent of graphene nanosheets, 10 to 15 percent of silicon carbide whiskers, 0.5 to 2 percent of silane coupling agent and the balance of polyether-ether-ketone, the preparation method of the high-performance polyether-ether-ketone modified sealing material comprises the following steps: mixing graphene nanosheets with a silane coupling agent, deionized water and absolute ethyl alcohol, carrying out ultrasonic dispersion for 2 hours, carrying out pretreatment to obtain a graphene nanosheet suspension, mixing the graphene nanosheet suspension with silicon carbide whiskers, polytetrafluoroethylene micro powder and polyether-ether-ketone, carrying out melt blending, and carrying out compression molding to obtain the high-performance polyether-ether-ketone modified sealing material. And cooling to obtain the high-performance polyether-ether-ketone modified sealing material.

The invention belongs to the technical field of high polymer materials, and discloses a bio-based spiral macromolecular flame retardant as well as a preparation method and application thereof. The novel bio-based spiral macromolecular flame retardant PDVPA is successfully prepared on the basis of common industrial raw materials in combination with bio-based renewable vanillin, and the novel bio-based spiral macromolecular flame retardant PDVPA is applied to preparation of a flame-retardant TPEE composite material by adopting a melt blending process. The phosphorus element in the PDVPA molecular structure is used as a main flame-retardant functional group, and can promote the charring of the spiral structure of the PDVPA molecular structure; meanwhile, an imine bond can be subjected to a trimerization reaction under a high-temperature condition to form a cross-linked network structure, so that the molten drop phenomenon during TPEE combustion is effectively inhibited. The invention provides a new way for improving the safety performance of the high polymer material and reducing the dependence on fossil resources.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

The invention discloses a high-voltage-resistant brominated flame-retardant polyamide composition and a preparation method thereof, and belongs to the technical field of flame-retardant materials. The composition comprises the following components in percentage by mass: 30-80 wt% of aliphatic polyamide, 10-30 wt% of a brominated flame retardant, 0.5-10 wt% of an antimony-based synergist, 0.5-10 wt% of aromatic zinc carboxylate, 0.5-5 wt% of hydroxyapatite, 0.1-50 wt% of a reinforcing agent and 0-5 wt% of other auxiliaries, the sum of the contents of all the components is 100 wt%, and the raw material components are subjected to melt blending processing through a single-screw or double-screw extruder. The invention provides the high-voltage-resistant brominated flame-retardant polyamide composition, the relative tracking index (CTI) of the high-voltage-resistant brominated flame-retardant polyamide composition is greater than 400V, and the high-voltage-resistant brominated flame-retardant polyamide composition has high-level flame retardance and cost effect.

The invention discloses a protective base film for a polaroid and a preparation method of the protective base film, and belongs to the technical field of optical display equipment protective films. The protective base film comprises an antistatic PET base material layer and a self-adhesive layer, the antistatic PET base material layer is prepared by blending optical-grade PET slices and antistatic master batches, the master batches are prepared by taking ionic liquid dihydric alcohol as a comonomer, and the base film is endowed with lasting and stable intrinsic antistatic performance; the self-adhesive layer is formed by melting and blending a polyurethane acrylate prepolymer, a modified montmorillonite filler, other matrix materials and auxiliaries according to a specific ratio and carrying out an online UV curing process. Through innovative material design and an integrated forming process, the prepared protective base film has excellent optical transparency, lasting antistatic property, appropriate bonding strength, clean stripping property and outstanding damp-heat aging resistance, the comprehensive performance is remarkably superior to that of a traditional gluing protective film, and the production process is more environment-friendly and efficient.

The invention relates to the technical field of chemical fibers, in particular to a low-melting-point polyester FDY (fully drawn yarn) preparation process which comprises the following steps: preparing raw materials, selecting polyester chips and a low-molecular-weight polyester copolymer, mixing the polyester chips and the low-molecular-weight polyester copolymer according to a ratio, melting and blending the polyester chips and the low-molecular-weight polyester copolymer with the additive amount of 5-8wt% and the intrinsic viscosity of 0.65-0.70 dL / g, and performing extrusion molding to obtain the low-melting-point polyester FDY. And putting the mixed raw materials into a screw extruder, and carrying out melt blending and spinning treatment at 250-260 DEG C. According to the low-melting-point polyester FDY and the preparation method thereof disclosed by the invention, a component regulation end is arranged, so that a synergistic effect mechanism of a polyester matrix and a low-melting-point copolymer is accurately matched in a preparation process of the low-melting-point polyester FDY, and the uniformity of melt components is ensured; meanwhile, the copolymerization structure design directivity acts on molecular chain regularity regulation and control, thermal stability fluctuation in the spinning process is inhibited in real time, it is guaranteed that the continuous forming capacity of fibers is maintained under the high-speed spinning condition, and the stability of a production line is improved.

The invention discloses a multi-layer composite polypropylene color master batch and a preparation method thereof.The multi-layer composite polypropylene color master batch comprises an inner layer, a middle layer and an outer layer, the inner layer is coated with the middle layer, the middle layer is coated with the outer layer, matrix resin, a composite toughening agent and an interface modifier are subjected to melt blending in a double-screw extruder, nano reinforcing filler is added, extrusion granulation is performed, and the multi-layer composite polypropylene color master batch is obtained. Carrier resin, hyperbranched polyesteramide and a toner pre-dispersion body are mixed at a high speed and then uniformly coated on the outer surface of the inner layer through fluidized bed equipment, and a mixture of a weather-proof additive and a lubricant is attached to the outer surface of the middle layer by adopting an electrostatic spraying process to form the outer layer. According to the multi-layer composite color master batch, the matrix resin and the composite toughening agent have a synergistic effect, so that the impact strength of the color master batch is improved, the cavity structure of hyperbranched polyesteramide is coated with the toner, the silane is used for treating the nano filler to reduce agglomeration and chromatic aberration, the outer layer delays aging, the lubricant reduces the extrusion torque, and the multi-layer composite color master batch is adaptive to a high-speed pipe production line.

The invention belongs to the technical field of polymer composite materials, and discloses a large-scale preparation method of a PPS-based composite material with low expansion and high dimensional stability. According to the method, a multi-scale synergistic enhancement system of graphene and nano silicon dioxide is constructed, a maleic anhydride grafted PPS compatilizer is introduced into melt blending, and interface chemical anchoring is achieved through amino-maleic anhydride-epoxy ternary reaction. The filler is premixed according to the mass ratio of 1: 1 after being subjected to surface functionalization, the total content is 15-30 wt%, and the composite material is obtained through twin-screw reactive extrusion and injection molding. The invention provides the large-scale preparation method of the low-expansion high-dimensional-stability PPS-based composite material which is reasonable in structural design, high in process controllability, excellent in performance index and suitable for industrial production, and the problem that thermal expansion suppression and interface strengthening are difficult to consider at the same time in the prior art is solved.

The invention relates to the technical field of high polymer materials, in particular to a high-performance composite material based on TPU waste recovery and a preparation method of the high-performance composite material. The problem that the mechanical property and the elastic property of an existing TPU composite material cannot be considered at the same time is solved. Recycled TPU waste particles and EVA particles are used as main raw materials, an ethylene-acrylate-maleic anhydride terpolymer is added as a compatilizer, and modified nano silicon dioxide is introduced as a reinforcing and nucleating agent; carrying out melt blending in a twin-screw extruder, and adding a cross-linking system through a side feeding port to prepare composite particles; and carrying out foaming, sizing and curing treatment by adopting a two-stage high-pressure physical foaming process to obtain the final composite material. Through cooperation of multiple components and precise process control, the problem of poor compatibility is solved, and perfect consideration of mechanical properties and elastic properties is realized.