867 results about "Melt viscosity" patented technology

The invention belongs to the technical field of engineering plastics, and particularly relates to a high-flame-retardant composite material and a preparation method thereof. The composite material comprises the following components: long-carbon-chain semi-aromatic nylon, a fiber reinforced filler, a flexibilizer, alkyl aluminum phosphinate, nano montmorillonite, a zinc ion ionomer, a coupling agent, a lubricant and an antioxidant. Alkyl aluminum phosphinate is used as a main flame retardant, and nano-montmorillonite and a zinc ion ionomer are used as auxiliary flame retardants. The nano-scale montmorillonite has certain adsorption performance, and can prevent the alkyl aluminum phosphinate flame retardant from being separated out in the processing process. The zinc ion ionomer is easier to disperse in a long-carbon-chain semi-aromatic nylon resin matrix relative to alkyl aluminum phosphinate and nano-montmorillonite, and ion groups contained in the zinc ion ionomer can generate an ionic crosslinking effect with ions in alkyl aluminum phosphinate and nano-montmorillonite, so that the mechanical property and the thermal stability of the composite material are improved; and moreover, the melt viscosity is improved, and the molten drop phenomenon during combustion is prevented.

The invention discloses a biodegradable paper-plastic composite material and a preparation method thereof. The biodegradable paper-plastic composite material is prepared from the following components in parts by mass: 70-90 parts of poly (butylene adipate-co-terephthalate), 10-30 parts of carbon dioxide-based polyester-polycarbonate and 0.2-0.5 part of a processing aid. Polybutylene adipate terephthalate (PBAT) not only has better mechanical properties, but also has higher ductility and elongation at break, but has the defects of low modulus, easiness in curl deformation, higher melt viscosity, easiness in adhesion to equipment and poor barrier property. PPCP belongs to an amorphous polymer, is high in tensile strength and excellent in barrier property, but is low in elongation at break (-5%), is a brittle polymer and is poor in melt strength, and the higher the temperature is, the poorer the melt strength is. Therefore, the PPCP is ingeniously used for modifying the PBAT blown film, the obtained film combines the properties of the two plastics, the good ductility and elongation at break are kept, the modulus of the film is also improved, and meanwhile, the melt strength is also easy to process.

The invention discloses a preparation method of an interface-modified flame-retardant polypropylene-based bamboo-plastic composite material. According to the method, a modification solution composed of a polyphenol component and a boron-containing component is adopted, bamboo powder is treated under the normal-temperature stirring condition, and the interface modified bamboo powder is successfully prepared. The mechanism is that polyphenol and a boron-containing component are subjected to a coordination reaction on the surface of bamboo powder, and a reversible borate dynamic covalent bond is constructed. The dynamic bond has a temperature response characteristic: reversible dissociation is realized during high-temperature processing, so that the melt viscosity of a composite system is reduced, and the processing fluidity is improved; the interface bonding force between the bamboo powder and the polypropylene matrix and the mechanical strength of the composite material are remarkably enhanced. In addition, the introduced boron element is used as an efficient flame-retardant component and promotes generation of a compact protective carbon layer during combustion, so that the flame-retardant property of the composite material is comprehensively improved.

The invention discloses a bio-based isosorbide carbonate plasticizer and a preparation method and application thereof, and relates to the technical field of plastic processing assistants.The preparation method of the bio-based isosorbide carbonate plasticizer comprises the steps that in the atmosphere of protective gas, diester carbonate and isosorbide serve as raw materials to be subjected to transesterification with a catalyst; and after the reaction is completed, carrying out post-treatment to obtain the isosorbide carbonate plasticizer. The isosorbide carbonate plasticizer disclosed by the invention can effectively reduce the melting temperature and melt viscosity of a material, improve the processability of the material, increase the flexibility of the material and improve the optical transmittance of the material. The preparation method disclosed by the invention has the characteristics of being simple in process, green and environment-friendly, easily available in raw materials, easy in catalyst separation and relatively high in product yield, and is an efficient and environment-friendly preparation process of isosorbide carbonate.

The invention belongs to the technical field of temperature control, and discloses a temperature control method and device of a hot runner system for an inverted mold. The method comprises the following steps: defining a critical melt area in a physical sprue which directly influences the product quality in a sprue of a hot runner system as a virtual sprue; dynamically generating a melt viscosity target track of the virtual gate region according to the type of an injection molding material and an injection molding process stage; based on measurable injection molding process parameters and sprue area temperature, estimating a current melt viscosity value of a virtual sprue area in real time through a state observer; calculating to obtain an optimal power control sequence by adopting a multivariable model prediction controller; and driving a sprue area heater according to the optimal power control sequence, so that the actual change of the melt viscosity of the virtual sprue area tracks a melt viscosity target track. According to the invention, the defects such as salivation and wire drawing can be effectively eliminated, so that the sprue quality stability and the production efficiency are improved.

A method for producing low-molecular-weight polytetrafluoroethylene which includes: (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation to a dose of 250 kGy or higher substantially in the absence of oxygen to provide low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. Also disclosed is a powder containing the low-molecular-weight polytetrafluoroethylene, the powder being substantially free from any of perfluorooctanoic acid and salts thereof.

The invention relates to the technical field of process control, in particular to a polyphenylene sulfide polymerizer temperature self-adaptive control method, which comprises the following steps: acquiring melt viscosity, heat release power and residence time deviation of a polymerizer in real time, and constructing a normalized multi-dimensional time sequence input vector by using a sliding window technology; and then, through fusing a weight control model of a long short-term memory network and an attention mechanism, combining static working condition characteristics, and analyzing and outputting adaptive weight coefficients for different deviation dimensions in real time. Meanwhile, based on the shear heat effect and the reaction accumulation effect, specific temperature compensation components for the inlet of the heating medium jacket are calculated, and independent amplitude limiting processing is carried out on all the components. And finally, a target set temperature is synthesized through weighting, and an execution mechanism is driven to act accurately by utilizing cascade PID control and a valve flow characteristic inverse mapping model. According to the invention, through deep fusion and mechanism compensation, accurate steady-state control of the polymerization reaction is realized.

The invention belongs to the technical field of ETFE film preparation, and particularly relates to a preparation method of a high-strength ETFE film. The preparation method of the ETFE film comprises the following steps: preparing a mixture of modified nano cellulose and calcium magnesium silicate whiskers; carrying out modification treatment on the poly (p-benzamide) fiber; and preparing the ETFE film. According to the preparation method of the high-strength ETFE film, the perfluoroalkoxy copolymer and the ETFE resin are selected and mixed for use, during melt extrusion, the perfluoroalkoxy copolymer can lubricate the ETFE and reduce the overall melt viscosity, the critical shear rate of the perfluoroalkoxy copolymer is higher than that of the ETFE, melt fracture can be inhibited, the film is evenly extruded, the flatness of the film surface is improved, and the high-strength ETFE film is prepared. And meanwhile, the elastic retraction of the ETFE is inhibited during high-temperature setting. And the modified nano cellulose and calcium magnesium silicate whisker mixture and the modified poly-p-benzamide fiber are added to enhance the mechanical strength of the prepared ETFE film.

The invention relates to the technical field of aluminum alloy casting, and discloses a rare earth alloying modified 3102 aluminum alloy semi-solid casting method which comprises the following steps: S1, preparing ingredients: firstly preparing a raw material of a 3102 aluminum alloy and then preparing a rare earth element, S2, smelting: sequentially putting the raw material of the 3102 aluminum alloy into smelting equipment according to a sequence, S3, adding the rare earth element, and S4, casting. After the 3102 aluminum alloy raw material is smelted, S4, preparing semi-solid slurry, namely, cooling and stirring a smelted solution through stirring equipment, and adding a grain refiner while stirring until the smelted solution is formed into the semi-solid slurry, S5, performing die casting or injection molding, injecting the semi-solid slurry into a die casting mold of die casting equipment, and S6, cooling and demolding. And S7, heat treatment is conducted, specifically, the demolded casting is subjected to solution treatment, and a protective atmosphere is added. The yield strength and tensile strength of the alloy are improved through mechanisms such as solid solution strengthening, copper and aluminum can form an intermetallic compound to achieve dispersion strengthening, hardness increasing and wear resistance improving, silicon is beneficial for reducing melt viscosity and improving fluidity, and the alloy body performance is further improved through mixing of multiple materials, and the alloy is suitable for being used in various scenes.

The invention relates to the technical field of open-milling granulation production control, and provides an open-milling granulation production process control method and system, and the method comprises the steps: monitoring and recording the flow state parameters of a melt strand at the outlet of a granulator die head in real time; monitoring and recording the driving motor torque and the driving motor rotating speed of an extrusion screw of the granulator in real time, and judging the fluctuation trend of the melt viscosity according to the driving motor torque and the driving motor rotating speed to obtain melt viscosity fluctuation trend information; based on the melt strand flow state parameters and the melt viscosity fluctuation trend information, executing a judgment process of a starting strategy of a feed-forward compensation mechanism to obtain a feed-forward compensation judgment result; according to the feedforward compensation judgment result, the rotating speed of a rotating cutter head of the granulator or the heating power of a die head is adjusted, so that the open milling granulation production process is controlled. The method has the effect of improving the stability of the open milling granulation production process.

The invention relates to a flame-retardant high-temperature-resistant fiber woven fabric and a preparation process thereof, and belongs to the technical field of textiles. The preparation method comprises the following steps: grafting and crosslinking a self-made grafting monomer and polyvinyl chloride, and then weaving to obtain the modified polyvinyl chloride fiber fabric; a phosphate group in the monomer can promote surface carbonization to form a protective carbon layer, silicate generated by decomposition of a siloxy group at a high temperature is combined with the carbon layer to improve the strength and melt viscosity of the carbon layer, and the phosphate group and the siloxy group synergistically enhance the flame retardance and the molten drop resistance of the fabric; a cyclic phosphate group and a pyridine ring are connected to form a rigid structure with relatively high thermal stability, chain segment movement is limited, a plurality of siloxy groups in a monomer are crosslinked to form a crosslinked network, molecular chain segments are difficult to move, and the combination of the rigid group and the crosslinked network improves the high temperature resistance of the fabric and effectively improves the mechanical properties of the fabric; in addition, the positively charged quaternary ammonium salt structure in the monomer improves the antistatic performance of the fabric, and cooperates with trifluoromethyl to destroy the structural integrity of bacterial cells, so that the fabric achieves efficient bacteriostasis.

The invention belongs to the technical field of temperature control, and provides a temperature control system of a carbon nanotube master batch production line, which comprises a process data acquisition module for acquiring process state data of the production line in the production process of the carbon nanotube master batch; and the dynamic cooperative control module is used for dynamically generating and outputting a cooperative adjustment instruction when the process state data deviates from the control target by taking the preset melt viscosity range and the specific mechanical energy range as the control target based on the obtained process state data. A composite control mode of feed-forward prevention and feedback fine adjustment is formed through feedback adjustment of the disturbance feed-forward compensation module and dynamic cooperative control, technological parameter drift caused by internal and external interference is restrained, a production line can still keep high stability when facing frequent or unpredictable disturbance, and the reject ratio of products is reduced.

The invention discloses a basalt fiber wiredrawing control method, system, equipment and medium, and relates to the technical field of control systems.The basalt fiber wiredrawing control method comprises the steps that a preset time period is set, a current moment and a historical moment are obtained, a historical wiredrawing diameter data sequence is obtained, and a stability index is obtained; if the stability index exceeds a preset threshold value, a historical melt viscosity data sequence is obtained, the viscosity change direction is obtained, and the wire drawing diameter change direction is obtained; if the diameter change direction is decreased, the minimum viscosity value is obtained, a first pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is smaller than the first pretreatment reference viscosity value, the temperature of the bushing plate is decreased; if the diameter change direction is increased, the maximum viscosity value is obtained, a second pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is larger than the second pretreatment reference viscosity value, the temperature of the bushing plate is increased. The device has the advantages that the wire drawing quality is improved, the energy efficiency is optimized, and the control is accurate.

The invention discloses a basalt fiber wiredrawing adjusting method, system, equipment and medium, and relates to the technical field of basalt fiber wiredrawing control, and the basalt fiber wiredrawing adjusting method comprises the following steps: obtaining melt viscosity in a pouring furnace; judging whether the melt viscosity is within the range of a preset viscosity threshold value or not, if yes, returning to obtain the melt viscosity in the pouring furnace, and if not, continuously obtaining a plurality of wire drawing state images of the basalt fiber in unit time; according to the multiple wire drawing state images, whether wire drawing abnormal characteristics exist or not is recognized, if not, the operation is returned to the step of obtaining the melt viscosity in the pouring furnace, and if yes, a first temperature adjusting parameter is obtained; wherein the first temperature adjusting parameter is used for adjusting the melt temperature in the pouring furnace; the first temperature adjusting parameter is input into the viscosity-temperature initial curve of the wire drawing process so as to update and obtain the viscosity-temperature target curve, and the method has the advantages that self-adaptive adjustment can be achieved, and the adjusting efficiency is improved.

The invention belongs to the technical field of inorganic mineral fiber preparation, and provides a high-strength and high-modulus inorganic mineral fiber prepared from water-quenched slag and a preparation method of the high-strength and high-modulus inorganic mineral fiber. Firstly, the chemical purity of raw materials is improved through density separation and acid pickling, meanwhile, Na2CO3 and Fe2O3 are added, the tendency of crystal precipitation is reduced, and the vitrification characteristic of water-quenched slag is improved; secondly, the composite oxide modifier further optimizes the structure of the glass network, and B2O3 enhances the chemical stability of the glass network and reduces the melt viscosity by forming a B-O-Si bond; y2O3 provides high electric field intensity, inhibits crystal precipitation and enhances the crosslinking degree of a network; v2O5 provides a redox buffer function through a variable valence state, so that the chemical environment in the melting process is optimized, and the creep resistance is improved; and finally, a compact Al2O3 coating is formed on the surface of the fiber, so that the mechanical strength, the oxidation resistance, the corrosion resistance and the high-temperature stability of the fiber are improved.

The invention provides a dimer acid type polyamide hot melt adhesive and a preparation method thereof. The polyamide hot melt adhesive comprises the following components in parts by weight: 50-90 parts of dimer acid, 5-40 parts of dicarboxylic acid, 45-130 parts of diamine, 1-10 parts of a catalyst and 5-20 parts of an antioxidant. The polyamide hot melt adhesive disclosed by the invention has relatively high softening point and melt viscosity, the adhesive property of the polyamide hot melt adhesive can be improved, and the polyamide hot melt adhesive has relatively high tensile strength and elongation at break, so that the polyamide hot melt adhesive is excellent in mechanical property and relatively wide in application range.

The invention relates to the field of PET foaming core materials, in particular to a fine-pore supercritical foaming PET material and a preparation method thereof.The PET material is prepared from, by weight, 60-100 parts of PET and 0.5-5 parts of an organic nucleating agent; 0.1 to 0.5 part of a nano nucleating agent; 0.2 to 1 part of a surfactant; 0.5 to 1 part of a crystallization accelerant; 0.5 to 5 parts of an antioxidant; 0.5 to 5 parts of a chain extender; and 0.5-5 parts of a foaming agent. According to the invention, the organic nucleating agent, the nano nucleating agent, the surfactant and the crystallization promoter are mixed, and a multi-section filling mode of the foaming agent is combined, so that on one hand, low-temperature mixing of the foaming agent and the nucleating agent can be realized, and non-uniform dissolution of the foaming agent during high-temperature processing is avoided; the problems of low melt viscosity, low crystallization rate, low cell shaping rate and the like are solved; on the other hand, a large number of small-size crystal regions can be formed in the PET mixed melt to serve as heterogeneous nucleation points of bubbles, and finally the fine-hole PET foaming material can be obtained.

Provided is a curable silicone composition having excellent handleability, and curing properties during sealing due to good hot-melt properties and low melt viscosity, in addition to having excellent cured product mechanical strength and substrate bonding strength, making the composition suitable as a sealant for semiconductor devices. The curable silicone composition comprises: (A) a hot-melt organopolysiloxane resin containing M and T units in certain ratios and having alkenyl groups; (B) an organosiloxane compound containing a specific siloxane unit and containing 10 mass % or more of an alkenyl group; (C) an organohydrogensiloxane compound; (D) a hydrosilylation catalyst; and (E) a functional inorganic filler in an amount of 400 to 3,000 parts by mass per 100 parts by mass of the total of components (A) to (D). The composition is solid at 25° C. and has hot-melt properties at a temperature of 200° C. or lower.

The invention provides a thermoplastic polyimide prepreg preparation method and a special device thereof, and the preparation method comprises the steps of unwinding, cloth storage and desizing, primary impregnation, secondary impregnation, pre-drying, tertiary impregnation, drying and the like. The solvent method for preparing the high-performance thermoplastic prepreg is realized, and the problems that the prepreg is low in resin content, insufficient in impregnation, insufficient in flatness, easy to have air holes, hard spots and the like are solved; the method is high in preparation efficiency and low in abrasion, and the prepared prepreg fiber is uniform in impregnation, flat and smooth in surface and uniform in thickness, has high strength and impact resistance, can be stored for a long time and can be recycled; the method is suitable for manufacturing the resin prepreg which is high in melt viscosity and can be dissolved in a proper single or mixed solvent, and the prepared prepreg can be applied to manufacturing of light-weight high-performance parts in the fields of rail transit, aerospace, weapons and the like.

The invention discloses low-temperature curing high-toughness polyester resin as well as a preparation method and application thereof, and relates to the technical field of high-molecular polymer materials. The polyester resin is prepared from the following raw materials: a prepolymer A, a prepolymer B and an end-capping reagent, the prepolymer A is a hydroxyl-terminated prepolymer containing one or more cycloalkyl groups; and the prepolymer B is a carboxyl-terminated prepolymer containing a borneol structure. The polyester resin has relatively low melt viscosity and relatively high glass transition temperature, is good in leveling property and flexibility, can realize low-temperature curing and is suitable for preparing a powder coating, and the obtained powder coating not only has low-temperature curing performance, but also has relatively low cost compared with a conventional polyester powder coating obtained by low-temperature curing. The leveling property, the flexibility and the storage stability can be considered, and the better comprehensive performance is achieved. The powder coating is particularly suitable for coating thermosensitive substrates, such as substrates such as wood and plastic.

The invention provides an inorganic fiber prepared from industrial solid waste and a preparation method thereof, and belongs to the technical field of inorganic fiber preparation. According to the rare earth doped low-temperature co-melt, a silicon-oxygen network is destroyed and stabilized, the viscosity of solid waste melt is reduced, phase splitting is inhibited, and a uniform melt environment is created; the viscosity of the carbon-coated composite nanoparticles is reduced through in-situ carbon thermal reduction reaction in a synergistic manner, and meanwhile, a reactant gas is utilized to clarify a melt, so that internal defects are removed; the apatite surface modified core-shell nanocrystal is used as a microstructure construction core, a fine and uniform microcrystalline phase is formed in the fiber through induction, and a high-strength basis of the material is constructed; homogenization of the low-temperature co-melt is the premise of subsequent uniform dispersion of additives, core-shell nanocrystals construct a high-strength microcrystalline matrix, carbon-coated particle cores are positioned at a phase interface, the fibers are endowed with high toughness through a physical mechanism, and comprehensive mechanical properties are improved through cooperation of the core-shell nanocrystals, the carbon-coated particle cores and the core-shell nanocrystals.

The present application proposes a devolatilizer and a method for devolatilization using the devolatilizer, the devolatilizer comprising a devolatilizer tank body; an inverted cone distribution plate arranged in the inner cavity of the devolatilizer tank body, the inner wall of the inverted cone distribution plate forming a first working surface for material to pass through; a conical cap-shaped distribution plate arranged in the inner cavity of the devolatilizer tank body, the outer wall of the conical cap-shaped distribution plate forming a second working surface for material to pass through, wherein the inverted cone distribution plate is arranged adjacent to the conical cap-shaped distribution plate, so that the material passes through the first working surface and the second working surface in sequence or passes through the second working surface and the first working surface in sequence. The devolatilizer has a conical cap-shaped distribution plate and an inverted cone distribution plate, which can expand the surface of the melt, prolong the effective devolatilization time, and improve the devolatilization effect within a wider melt viscosity range and a wider operating elasticity range.

The invention discloses polyester resin as well as a preparation method and application thereof. The polyester resin is prepared from the following raw materials in parts by mass: 30 to 40 parts of polyhydric alcohol, 40 to 60 parts of polybasic acid, 3 to 20 parts of acidolysis agent, 0.1 to 2 parts of chain extender and 0.01 to 0.2 part of additive. The polyol comprises aliphatic polyol containing a side group; the polybasic acid comprises monocyclic aromatic polybasic acid and condensed ring aromatic polybasic acid; the chain extender is selected from a polymer containing an epoxy group. According to the invention, through combination of specific polybasic acid and polyhydric alcohol, the prepared polyester resin has appropriate acid value, melt viscosity, glass transition temperature and reaction activity; and the surface tension of the polyester resin is reduced by combining the use of the epoxy group-containing chain extender, so that the compatibility between macromolecular chain segments and between the resin and the filler in a coating film is enhanced in the film forming process, and the gas-liquid barrier property of the coating film is improved.

The invention discloses a high-fluidity and high-melting-point polyester copolymerization material which comprises terephthalic acid, dihydric alcohol I, dihydric alcohol II, aromatic dicarboxylic acid or derivatives thereof and an ethylene glycol antimony catalyst, and the terephthalic acid, the dihydric alcohol I, the aromatic dicarboxylic acid or the derivatives thereof and the ethylene glycol antimony catalyst are uniformly mixed and then subjected to esterification reaction; after the esterification reaction is finished, dihydric alcohol II is introduced for a pre-polycondensation reaction and a final polycondensation reaction to prepare the high-fluidity and high-melting-point polyester copolymerization material, aromatic dicarboxylic acid or derivatives thereof react with excessive dihydric alcohol I in the esterification stage, so that the aromatic dicarboxylic acid or the derivatives thereof are grafted into a polyester molecular chain, and the dihydric alcohol I is attached with a flexible chain segment, so that the high-fluidity and high-melting-point polyester copolymerization material is obtained. Dihydric alcohol I is connected into a polyester molecular chain through condensation polymerization to form the high-fluidity and high-melting-point polyester copolymer material with an aliphatic flexible chain segment. And the mechanical property is not lost while the fluidity of the polyester is improved, the melt viscosity drop is effectively controlled, the cost is low, and the application prospect is wide.

The present invention belongs to the field of polyester recycling, and specifically discloses an intelligent process system for recycling waste polyester and a method for intelligently regenerating waste polyester materials using the system. The waste polyester is mainly recycled with high viscosity and stability through an online viscosity detector and a multi-stage viscosity control system, thereby avoiding the problem of limited application range caused by low melt viscosity or large fluctuation range of the recycled polyester material. The present invention conducts a comprehensive investigation on the parameter fluctuation range of the waste polyester recycling material, and upgrades and transforms the traditional equipment by using an automated algorithm. The equipment has a small investment and a high degree of automation, can realize stable regeneration and processing of the waste polyester material, effectively reduces the production cost, and has broad market application prospects.

The present invention discloses a recyclable bio-based thermosetting polyurethane hot melt adhesive and its preparation method, which includes vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, macromolecular thermoplastic tackifying resin, isocyanate, furan compound containing active hydrogen, and bifunctional bismaleimide. First, the present invention reacts vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, and macromolecular thermoplastic tackifying resin with diisocyanate to generate a polyurethane prepolymer. Subsequently, the furan compound containing active hydrogen is reacted with the above prepolymer. Finally, bifunctional bismaleimide is added to form a dynamic covalent polymer therewith. The prepared bio-based thermosetting polyurethane hot melt adhesive has a low melt viscosity, a high ultimate peel strength, and recyclable characteristics. Some raw materials of the present invention are derived from biomass and renewable materials, which improves the green sustainability of the product's entire life cycle.

A polymer composition that comprises a polymer matrix containing a first liquid crystalline polymer that includes one or more monomers derived from bio-naphtha is provided. The polymer composition exhibits a melt viscosity of about 60 Pa-s or less as determined in accordance with ISO 11443:2021 at a shear rate of 1,000 seconds−1 and temperature that is 15° C. higher than the melting temperature of the composition.

The invention provides a high-flowability reclaimed material modified PET injection molding material and a molding method thereof. Comprising the following steps: mixing the following components in percentage by weight: 65%-70% of recycled PET, 8%-12% of a PET-BA block copolymer, 2%-4% of a bifunctional polar chain extender, 1%-3% of a nitrogen-doped MXene nanosheet, 3%-6% of a thermally induced reversible Diels-Alder structural monomer, 8%-12% of a plasma modified POE-g-COOH toughening agent, 2%-4% of a polyester-amino silane grafted elastomer and 1%-3% of an efficient phosphate metal salt nucleating agent, by adding the PET-BA block copolymer, the nitrogen-doped MXene nanosheet and the Diels-Alder structural monomer, the melt viscosity of the material is remarkably reduced, the fluidity is improved, and the resistance in the injection molding process is reduced; according to the present invention, the difunctional polar chain extender and the plasma modified POE-g-COOH toughening agent are adopted to enhance the tensile strength, the impact toughness and the bending modulus of the recovered PET so as to make the material meet various molding requirements, and the nitrogen-doped MXene nanosheet and the efficient phosphate metal salt nucleating agent are added to improve the thermal conductivity and the crystallization rate of the material.

To provide a thermosetting maleimide resin composition which has low melt viscosity during heating, has excellent flexibility of the cured film in its cured product, has low dielectric constant and dielectric loss tangent, has high glass transition temperature, has a low coefficient of thermal expansion, and has excellent long-term heat resistance and moisture resistance.SOLUTION: A thermosetting maleimide resin composition contains (A) a bismaleimide compound represented by the following formula (1) (in the formula (1), A represents a tetravalent organic group including a cyclic structure, B represents a divalent hydrocarbon group derived from a dimer acid skeleton, Q represents a divalent group having a fluorene skeleton or an indene skeleton, W is B or Q, n is 1 to 100, and m is 1 to 100, (B) a thermosetting resin having one or more maleimide group reactive functional groups selected from an alkenyl group, a maleimide group, an epoxy group, a cyanate group, a hydroxyl group, an acid anhydride group, a (meth)acrylic group and a thiol group, and (C) a reaction accelerator.SELECTED DRAWING: None

To provide a photocurable hot-melt composition which has high workability due to its moderate melt viscosity, exhibits good initial adhesion when bonding an adherend, and has improved adhesive strength because of its high peel strength.SOLUTION: The photocurable hot-melt composition contains a photocurable styrenic thermoplastic elastomer (A), a tackifier (B), a softener (C), and a photopolymerization initiator (D). The photocurable hot-melt composition contains, as the softener (C), an oil (c1) containing 35% or more of a naphthenic component.SELECTED DRAWING: None