281 results about "Binary acid" patented technology

The invention relates to polyurethane resin, synthetic leather and a preparation method and application thereof, and relates to the technical field of polyurethane, the polyurethane resin is prepared from the following raw materials: bio-based polyester polyol, polyolefin polyol, isocyanate, a chain extender, a pore-forming agent and a solvent; the bio-based polyester polyol is prepared from the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid and micromolecular branched chain-containing dihydric alcohol. The polyurethane resin provided by the invention is high in bio-based content, micromolecular branched chain-containing dihydric alcohol is introduced into bio-based polyester polyol, a branched chain structure provides scratch resistance for the synthetic leather taking the polyurethane resin as a coating layer, the crystallinity of the polyurethane resin is reduced by compounding the polyolefin polyol, the synthetic leather is endowed with soft hand feeling, and the synthetic leather has the advantages that the synthetic leather is not prone to being scratched, and the service life of the synthetic leather is prolonged. Due to the addition of the chain extender and the pore-forming agent, the polyurethane has excellent foaming performance, the synthetic leather has excellent water absorption, and the hand feeling of the synthetic leather is further improved.

The invention relates to the technical field of material preparation, and discloses a polyamide elastomer and a preparation method and application thereof, and the preparation method of the polyamide elastomer comprises the following steps: mixing raw materials, and carrying out amidation reaction to obtain an amide compound; then adding a catalyst B, and carrying out polyesterification reaction to obtain a polyamide elastomer; the raw materials comprise binary acid, diamine, polyether glycol, a catalyst A and water, the reaction temperature of the amidation reaction is 150-180 DEG C, and the addition amount of the water is 20-40% of the total mass of the binary acid, the diamine and the polyether glycol. The polyamide elastomer which is relatively regular in structure and excellent in comprehensive performance can be prepared, the reaction efficiency can be effectively improved, and the preparation method is suitable for industrial large-scale production.

The invention provides copolymerized flame-retardant nylon containing nitrogen and phosphorus as well as a preparation method and application of the copolymerized flame-retardant nylon. The copolymerized flame-retardant nylon containing nitrogen and phosphorus is formed by copolymerizing a structural unit I and lactam or copolymerizing the structural unit I, diamine and binary acid, the nitrogen and phosphorus-containing copolymerized flame-retardant nylon belongs to a halogen-free flame-retardant environment-friendly high polymer material and is intrinsic flame-retardant nylon, so that the problems of flame retardant migration, compatibility with a base material and the like do not exist, excellent flame-retardant performance can be achieved under the condition of relatively low introduction amount of a flame-retardant structural unit, and meanwhile, excellent mechanical property and spinnability can be kept.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The invention belongs to the technical field of polyurethane resin, and provides polyurethane resin, polyurethane synthetic leather and a preparation method and application thereof. The preparation raw materials of the polyurethane resin comprise the following components in percentage by mass: 11%-18% of modified polyol, 3%-9% of bio-based polyol A, 0.01%-0.02% of an antioxidant, 0.001%-0.003% of a catalyst, 5%-7% of isocyanate, 0.5%-3% of a chain extender, 0.1%-0.4% of a terminator, 0.02%-0.04% of an anti-visbreaking aid, 0.5%-3% of a polyether aid and 68%-73% of a solvent, wherein the preparation raw materials of the modified polyol comprise bio-based polyol, alcohol amine and binary acid; the bio-based polyol A comprises bio-based polypropylene carbonate dihydric alcohol. The polyurethane synthetic leather prepared by the preparation method disclosed by the invention has good slip resistance, excellent perspiration-resistant color fastness and relatively high blackness, and is suitable for yoga mats.

The invention discloses a sulfonate grafted polyether-polyester-polyamide block copolymer and a synthesis method thereof, and belongs to the field of materials. The invention provides a block copolymer elastomer material taking polycaprolactam as a hard segment and polyether and polyester as soft segments, and specific sulfonic acid groups are introduced to meet specific applications. According to the invention, caprolactam, 6-aminocaproic acid, aliphatic dibasic acid, aliphatic diamine, polyether glycol, sulfonate grafted polyester polyol BY-3305 and the like are used as raw materials, and macromolecular sulfonate grafted polyester polyol BY-3305 is used as a sulfonate grafting agent, so that the reaction efficiency is higher than that of a small molecular monomer containing a sulfonic acid group, and fewer reaction byproducts are generated; the polymerization reaction can be smoothly carried out. The sulfonate grafted polyether-polyester-polyamide block copolymer elastomer is obtained through one-step melt polymerization, and has the advantages of being simple and convenient in synthesis method, low in production cost, high in strength, adjustable in performance and the like.

The invention discloses an isosorbide-based heat-resistant yellowing-resistant biodegradable polyester and a preparation method thereof.The preparation method comprises the following steps that under the condition of an esterification catalyst, dibasic acid and dihydric alcohol are subjected to an esterification reaction, the dibasic acid is composed of terephthalic acid and 1, 1-cyclohexanedicarboxylic acid, and the dihydric alcohol is composed of 1, 1-cyclohexanedicarboxylic acid; the dihydric alcohol is composed of isosorbide and aliphatic dihydric alcohol; after the esterification reaction is finished, adding a polycondensation catalyst, a stabilizer and a toner into an esterification reaction product to carry out polycondensation reaction; after the polycondensation reaction is finished, the polycondensation product is subjected to bracing and grain-sized dicing, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained. 1, 1-cyclohexanedicarboxylic acid is introduced to replace part of terephthalic acid, aromatic ring structures on polyester chains are reduced, the yellowing resistance of polyester is improved, meanwhile, biomass-sourced isosorbide is added as a heat-resistant modified component, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained through a direct esterification method.

The invention relates to the field of polyester fiber production, and discloses modified copolyester, a preparation method thereof and a polyester fiber product. The modified copolyester contains a structural unit A as shown in a formula (I), a structural unit B as shown in a formula (II) and a structural unit C as shown in a formula (III), wherein R1, R2, R3 and R4 are each independently a C1-C10 alkyl group, and m is a positive integer greater than 3; rI, RII, and RIII are each independently hydrogen or a C1-C10 alkyl group. The preparation method comprises the following step: in the presence of a catalyst, carrying out contact reaction on a binary acid monomer, a dihydric alcohol monomer, a component a with a structure as shown in a formula (I), a component b with a structure as shown in a formula (II) and a component c with a structure as shown in a formula (III). The modified copolyester fiber material has good softness and crease resistance, the wearability of a polyester fiber product can be effectively improved, and the diversity and functionality of the polyester material are improved. # imgabs0 #

The invention relates to the field of 3D printing, and particularly discloses high-toughness and high-tack polyester for 3D printing and a preparation method thereof.The polyester is prepared from, by mass, 0.2-3% of antioxidant, 0.1-3% of dispersing agent and the balance matrix resin; the matrix resin comprises the following raw materials: binary acid, dihydric alcohol, a graft polymer, a catalyst and a protective agent. According to the polyester, a graft polymer containing active groups such as hydroxyl is introduced into matrix resin, so that the melt uniformity of a whole blending system is improved, the interface energy is reduced, a polyester molecular chain is easier to cross an interlayer interface to move and entangle, stronger physical connection is formed, layers are easier to bond and do not crack during 3D printing, and the 3D printing performance is improved. The adhesive has excellent interlayer adhesive force, meets the application requirement of high additional value in the field of industrial-grade 3D printing, and can be used in the fields of outdoor artware, construction industry, aerospace, medical instruments and the like.

The invention relates to acrylate modified polyester resin as well as a preparation method and application thereof. The method comprises the following steps: (1) performing esterification reaction on anhydride with polyfunctional groups and long-chain unsaturated monofunctional alcohol to obtain an unsaturated intermediate; (2) carrying out esterification reaction on the unsaturated intermediate obtained in the step (1), dibasic acid and dihydric alcohol, and then carrying out polycondensation reaction to obtain a polyester resin intermediate containing unsaturated double bonds; and (3) carrying out free radical polymerization reaction on the polyester resin intermediate containing the unsaturated double bond obtained in the step (2) and an acrylate monomer to obtain the acrylate modified polyester resin. The acrylate modified polyester resin obtained by the method provided by the invention has excellent non-polar base material bonding performance.

The invention belongs to the technical field of high polymer material preparation, and provides a low-melting-point toughened copolyester chip and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing hyperbranched polyester of which the surface is rich in carboxyl-terminated functional groups through core growth of polybasic acid alcohol and end group functionalization reaction of anhydride; the other chain extender is a linear chain extender which has a long flexible chain segment and two tail ends of which are also functionalized by carboxyl groups, and is obtained by carrying out end group esterification reaction on polyether glycol; then, in the synthesis process of the main polyester, carrying out multi-stage melt polycondensation on an aromatic dibasic acid component and a polyol component under the action of a composite catalyst system, introducing the hyperbranched polyester and a chain extender into a reaction system in the form of slurry, and covalently bonding a functional additive to a copolyester main chain through a polycondensation process, so as to obtain the hyperbranched polyester. An integrated network reinforced structure is formed, so that the copolyester chip has the characteristics of low melting point and excellent toughness.

The invention provides a method for preparing electrolyte-based homo-polyester based on a waste electrolyte, and belongs to the field of polymer synthesis and high-value utilization of resources, a high-boiling-point organic solvent in the waste lithium battery electrolyte and straight-chain dihydric alcohol are subjected to transesterification under the action of a catalyst to be converted into straight-chain carbonate dihydric alcohol ester; then, the straight-chain carbonic acid diol ester is used as a rigid monomer to be copolymerized with bio-based dibasic acid, and a high-performance homopolyester material with high thermal stability, excellent mechanical property and good biodegradability is prepared; the method not only solves the problem of innocent treatment of the waste electrolyte, but also realizes effective reutilization of resources, reduces the production cost of the polyester, and remarkably improves the comprehensive performance of the polyester; in addition, compared with traditional petroleum-based polyester, the novel material provided by the invention has better environmental protection characteristic, reduces dependence on non-renewable resources, and promotes green circulation and sustainable development.

The invention discloses a flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The desulfurization composite synergist is prepared from the following raw materials in parts by weight: 5 to 10 parts of citric acid, 20 to 30 parts of binary acid, 15 to 20 parts of sodium formate, 15 to 20 parts of sodium salt, 12 to 18 parts of magnesium salt, 2 to 4 parts of surfactant, 2 to 4 parts of pH buffering agent and 5 to 10 parts of calcium oxide. The preparation method comprises the following steps: carrying out a ring-opening reaction on 3-(2-aminoethylamine) propyl methyl dimethoxy silane and glucolactone to obtain an intermediate 1, and then carrying out a two-step quaternization reaction to synthesize the novel surfactant. The prepared desulfurization composite synergist has a good desulfurization effect and is suitable for limestone-gypsum wet flue gas desulfurization.

The invention discloses transparent copolyester, a preparation method thereof and a product prepared from the copolyester. The preparation method comprises the following steps: carrying out esterification or ester exchange reaction on dibasic acid or dimethyl ester of the dibasic acid and dihydric alcohol at 5-300kPaG to obtain an esterified substance or an ester exchange substance; then, the normal pressure of the system is recovered, the esterification or ester exchange temperature is kept unchanged, the negative pressure of the ester or ester exchange material is gradually reduced to high vacuum according to a certain pressure reduction rate, excessive monomers are removed, the content of impurities generated by the ester or ester exchange material is 0.3 wt% or below, and a prepolymer is obtained; and further heating the prepolymer, and carrying out final polycondensation reaction under high vacuum to obtain the target copolyester. The method can effectively weaken the side reaction in the synthesis process, improve the hue of the copolyester product, improve the light transmittance, reduce the haze and improve the heat resistance. Products prepared from the copolyester, such as bottle materials, sheets, plates and membrane materials, have the characteristics of light color, high transparency and good heat resistance.

The invention relates to the field of polyester, and discloses a halogen-free antimony-free flame-retardant polyester preparation method, which comprises: 1) grinding a magnesium compound catalytic promoter, and crushing under liquid nitrogen cooling; then dispersing a catalytic promoter in ethylene glycol to obtain a catalytic promoter dispersion liquid; 2) mixing and esterifying dibasic acid, dihydric alcohol and a flame retardant dihydric alcohol esterifying liquid; 3) after esterification is finished, adding a titanium catalyst and a catalytic promoter dispersion liquid; and carrying out preshrinking and final shrinkage reactions to obtain the halogen-free antimony-free flame-retardant polyester. According to the invention, a titanium catalyst is compounded with a magnesium compound to serve as a catalytic promoter, so that the problem of yellowing of polyester caused by the titanium catalyst can be solved on the premise of realizing antimony-free environmental protection; and meanwhile, the magnesium compound catalytic promoter can also form a magnesium oxide layer and water vapor when the polyester is combusted, so that heat transfer can be reduced, the oxygen concentration can be diluted, and molten drops generated when the polyester is combusted can be reduced.

The invention provides bio-based hyperbranched unsaturated polyester, a UV curing coating and application of the bio-based hyperbranched unsaturated polyester and the UV curing coating. The bio-based hyperbranched unsaturated polyester is obtained through polycondensation of preparation raw materials including bio-based hydroxyl-terminated hyperbranched polyester, unsaturated binary acid and / or anhydride thereof and maleic acid modified polyolefin. The preparation raw materials of the UV curing coating comprise the following components in parts by weight: 20-60 parts of bio-based hyperbranched unsaturated polyester, 20-80 parts of an active diluent monomer and 2-7 parts of a photoinitiator. The hyperbranched unsaturated polyester disclosed by the invention is high in reaction activity, low in viscosity and low in shrinkage rate; the UV coating prepared from the resin is low in viscosity and can be coated in a roller coating mode, a cured coating is compact, MEK wiping resistance reaches more than 1000 times, glossiness attenuation is lower than 10% after UVB illumination is adopted for 1600 h, haze is lower than 1%, hardness and abrasion resistance are excellent, adhesive force to multiple base materials is good, and the UV coating is very suitable for being applied to optical films.

The invention provides an ultraviolet-cured low-refractive-index UV resin and a preparation method thereof, and the preparation method comprises the following steps: A) mixing epoxy resin, fluorine-modified binary acid, a first catalyst, an antioxidant and a polymerization inhibitor, and carrying out a reaction to obtain a first product; b) mixing the first product, modified acrylate and a coupling agent, and reacting to obtain a second product; and C) mixing the second product with a modified acrylate monomer to obtain the UV-cured low-refractive-index UV resin. The perfluoropolyether and the silicon-containing hydroxyl acrylate are modified, so that the problems of poor compatibility, non-transparent paint film and the like caused by directly grafting the perfluoropolyether and the silicon-containing hydroxyl acrylate into a structural system are greatly improved, and the perfluoropolyether and the silicon-containing hydroxyl acrylate have obvious advantages in the application direction with requirements on the transparency of the paint film. The stability of the resin can be improved, so that the resin is not prone to gelling during production, and the problems of layering and the like are not prone to occurring during use.

The invention relates to an acrylic acid-organic silicon dual-modified polyester aqueous dispersion, which is prepared from the following components in percentage by weight: 1 to 5 parts of hexahydrophthalic anhydride, 10 to 15 parts of isophthalic acid, 1 to 5 parts of adipic acid, 15 to 20 parts of neopentyl glycol, 0.5 to 1 part of unsaturated binary acid, 1 to 2 parts of reflux solvent, 5 to 10 parts of acrylate mixed monomer, 0.5 to 1 part of acrylic acid, 5 to 10 parts of cosolvent, 1 to 5 parts of organic silicon modifier, 0.5 to 5 parts of dimethylethanolamine neutralizer and 40 to 45 parts of deionized water. The acrylic acid and the organic silicon are used for modifying the polyester at the same time, the weather resistance, the hydrolysis resistance and the adhesive force are remarkably improved while the high flexibility of the water-based polyester is kept, the synthesized water-based polyester dispersion can be used for preparing high-performance water-based coil steel coating or coil aluminum coating or other water-based amino coating with VOC smaller than or equal to 100 g / L, and good comprehensive performance is achieved.

The invention discloses weather-resistant and medium-resistant alkyd resin varnish and a preparation method thereof. The varnish is prepared from the following raw materials: modified alkyd resin, a composite drier, zirconium iso-octoate with the purity of 12%, an anti-skinning agent, 200 # solvent oil and xylene. The modified alkyd resin is prepared from the following raw materials: soya oil acid, pentaerythritol, benzoic acid, pyrrolidine-2-one-1-acetic acid, dimethylbenzene and a 200 # solvent. According to the invention, pyrrolidine-2-ketone-1-acetic acid is used as a binary acid component to partially or completely replace traditional phthalic anhydride, so that the reaction efficiency of alkyd resin synthesis can be improved, and the problems of yellowing, pulverization and poor water resistance of traditional alkyd resin can be solved; according to the varnish prepared by the invention, on the basis of maintaining the inherent gloss, flexibility and constructability of alkyd resin, the key properties such as weather resistance, water resistance and acid resistance are improved; the whole preparation process of the varnish continues to use mature alkyd resin production equipment and flow, and has good economical efficiency and industrial popularization prospects.

The invention belongs to the technical field of polymer materials, and particularly relates to a polyaromatic-carbonic acid-aliphatic copolyester production method which comprises the following steps: mixing aromatic dibasic acid and aliphatic dihydric alcohol, feeding into a first esterification kettle, and adding an esterification catalyst for esterification reaction to obtain an esterification product; uniformly mixing aliphatic dihydric alcohol, feeding the mixture into a second esterification kettle, adding diester carbonate and a transesterification catalyst into the second esterification kettle, reacting to obtain a transesterification product, and feeding the transesterification product into a demonomerisation kettle to obtain a demonomerisation product; mixing the esterification product and the demonomerisation product with a polycondensation catalyst and a stabilizer, shearing and homogenizing, feeding into a pre-polycondensation kettle for reaction to obtain a pre-polycondensation product, feeding the pre-polycondensation product into a final polycondensation kettle for reaction to obtain a copolymer, and performing water-cooling granulation to obtain a copolyester product. According to the production method provided by the invention, the final polycondensation time can be shortened, and the weight-average molecular weight and the mechanical strength of the prepared copolyester are improved.

The invention discloses a degradable bio-based polyurethane wood protective coating. The coating comprises the following components: 40-60 parts of modified bio-based polyester polyol, 10-20 parts of a cross-linking agent, 3-8 parts of an antibacterial agent, 1-3 parts of a weather-resistant agent, 2-5 parts of a hydrolysis stabilizer, 20-30 parts of a solvent, 1-3 parts of a coupling agent, 0.5-1.5 parts of a leveling agent and 0.5-1.5 parts of a defoaming agent. The preparation method of the degradable bio-based polyurethane wood protective coating comprises the following steps: firstly, esterifying binary acid, dihydric alcohol and renewable biomass resources to prepare bio-based polyester polyol, then modifying the bio-based polyester polyol by using a hydrophobic modifier, finally mixing and dispersing the bio-based polyester polyol with other auxiliaries uniformly, and curing to obtain the degradable bio-based polyurethane wood protective coating. The coating has a static water contact angle of 113 degrees at most after being coated, the QUV aging life reaches 480 h, the antibacterial rate reaches 90% at most, the 90-day compost degradation weight loss rate reaches 60% at most, and the coating is environmentally friendly, low in VOC emission and suitable for efficient and durable protection of wood. The invention also provides an application of the degradable bio-based polyurethane wood protective coating.

The invention provides a preparation method of modified epoxy acrylate resin, which comprises the following steps: (1) mixing epoxy-terminated polyisoprene liquid rubber, unsaturated binary acid and a catalyst A for reaction A, and then adding polyol and a catalyst B for reaction B to obtain a modifier; and (2) mixing epoxy resin, unsaturated monocarboxylic acid, a catalyst A and a polymerization inhibitor for reaction C, then adding the modifier and the cross-linking agent in the step (1), and uniformly mixing to obtain the modified epoxy acrylate resin. The synthetic process is simple, the reaction endpoint is clear, the resin toughness is improved, the resin curing shrinkage rate is reduced, and the wettability with glass fibers is improved.

This invention mainly provides a mechanochromic polyester polyol, its preparation method, and its uses. The mechanochromic polyester polyol is prepared by esterification and polycondensation reactions of raw materials comprising 100 moles of a diacid / anhydride, 110-400 moles of a polyol, and 5-30 moles of a trihydroxyrhodamine derivative. The polyester polyol prepared by this invention contains mechanosensitive groups, aromatic rings, and a bialicyclic structure. The resulting polyurethane material exhibits excellent mechanochromic properties and high wear resistance.

The invention relates to the field of rubber composite materials, and discloses a rubber / PTFE composition and a preparation method thereof. The composition comprises a rubber compound and surface-modified PTFE micro powder, the PTFE micro powder is grafted with a molecular chain with an imide structure through in-situ polymerization, the molecular chain is composed of a binary anhydride monomer residue Ar1 and a diamine monomer residue Ar2, and the structure is selected from the combination of a specific benzene ring, an ether bond, a fluoro group and the like. The preparation method comprises the following steps: carrying out plasma activation on PTFE micro powder, reacting the PTFE micro powder with aromatic monomers containing amino groups and anhydride groups in a mixed solvent to generate a polyimide grafted layer, and mixing the polyimide grafted layer with a rubber compound for vulcanization. According to the modification technology, the interface bonding force of PTFE and a rubber matrix is remarkably improved, and the problems of uneven dispersion and interface debonding of a traditional filler are solved. The high thermal stability of the imide structure and the synergistic effect of polar groups enable the composite material to have excellent tensile strength, wear resistance and aging resistance, and at the same time, the processing stability is maintained.

The invention provides a modified polyamide resin and a preparation method thereof, the modified polyamide resin comprises a structural unit derived from binary acid and diamine, and an end-capping structure derived from an oxetane compound of formula (I): (I) wherein R1 is C1-C6 alkyl, R2 is C1-C12 hydroxyalkyl or C2-C6 alkyl interrupted by an ether bond; wherein the molar ratio of the diamine to the binary acid is 1: (1-1.01); the mass of the oxetane compound is 1-3% of the mass of the modified polyamide resin; the number-average molecular weight of the modified polyamide resin is 25000 to 35000.

The application discloses a kind of high-temperature-resistant nylon copolymer and preparation method thereof, belong to high-temperature-resistant nylon field.The preparation method provided by the application includes the following steps: binary acid, binary amine, antioxidant, end-capping agent and catalyst are added into polymerization kettle to carry out salt making reaction, obtain salt solution;The salt solution is cooled, filtered, dried, and high-temperature-resistant nylon salt is obtained;High-temperature-resistant nylon salt is added into double-stage double-screw extruder, pre-polymerization is carried out in the first-stage double-screw extruder, and tackifying reaction is carried out in the second-stage double-screw extruder, and the finally extruded material is high-temperature-resistant nylon copolymer.The application carries out pre-polymerization and tackifying reaction by introducing double-stage double-screw extruder, based on the good blending and shearing effect of double screw, can promote the progress of pre-polymerization and tackifying reaction, can effectively reduce production energy consumption, and production efficiency is high, process condition is easy to control, and product stability is good.

The invention discloses bio-based unsaturated polyester resin for a high-thermal-conductivity powder coating, a preparation method of the bio-based unsaturated polyester resin, a powder coating composition and a high-thermal-conductivity coating. The bio-based unsaturated polyester resin for the high-thermal-conductivity powder coating is characterized by comprising the following components: A) unsaturated binary acid / anhydride; b) saturated binary acid / anhydride; c) a diol comprising from 30 to 70 mol% of isosorbide, from 20 to 50 mol% of bio-based 1, 3-propanediol and / or 1, 4-butanediol, and from 0 to 20 mol% of an auxiliary diol selected from one or more of ethylene glycol, neopentyl glycol, hydrogenated bisphenol A; d) an esterification catalyst; and a polymerization inhibitor. According to the bio-based unsaturated polyester resin for the high-thermal-conductivity powder coating, through unconventional bio-based monomers and a special molecular structure design, on the premise of ensuring proper Tg and processability, consideration of high bio-based content and high thermal conductivity is realized.

The invention relates to a block copolymer, a polyamide elastomer and application thereof, the block copolymer comprises a hard segment and a soft segment, the hard segment comprises a polyamide block, and the soft segment comprises a polyether block; wherein the polyamide block is obtained through reaction of pentamethylene diamine and long carbon chain dibasic acid, and the long carbon chain dibasic acid comprises more than three long carbon chain dibasic acid with odd number of carbon atoms or more than three long carbon chain dibasic acid with even number of carbon atoms. The block copolymer provided by the embodiment of the invention has excellent comprehensive performance, and can greatly improve the elongation at break and notch impact strength of a material when being used as a toughening agent of a polyamide material.

The present invention belongs to the technical field of unsaturated polyester resin materials, and specifically relates to an unsaturated polyester resin material containing a potassium bromide composite accelerator and a preparation method thereof. The unsaturated polyester resin material containing a potassium bromide composite accelerator comprises the following raw materials: an unsaturated polyester resin, a composite accelerator, and an initiator; the unsaturated polyester resin is composed of the following raw materials: a diol, a saturated dibasic acid, an unsaturated dibasic acid, an inhibitor, an antioxidant, and styrene. The unsaturated polyester resin material containing a potassium bromide composite accelerator of the present invention uses a composite accelerator to catalyze the isomerization and cross-linking of the unsaturated polyester resin, thereby increasing the curing speed of the unsaturated polyester resin, ensuring production efficiency, and reducing production costs; the product prepared using the composite accelerator has improved flexural strength and flexural modulus, and the impact resistance of the product is enhanced; the present invention also provides a preparation method thereof, and the preparation process is simple.

The invention discloses a composite adhesive for a reflective fabric material as well as a preparation method and application thereof. The composite adhesive comprises a polyurethane matrix, and the polyurethane matrix comprises a carboxylic acid monomer; the carboxylic acid monomer is hydroxy acid or binary acid and is used for introducing terminal carboxyl into a polyurethane molecular chain. Through the design, the excellent washing resistance of a polyurethane matrix is reserved, the binding strength with an aluminum-plated layer, a cloth base and glass beads is comprehensively improved through terminal carboxyl introduced by hydroxy acid or binary acid, and meanwhile, the crosslinking density and cohesive strength are enhanced. Compared with the prior art, the invention effectively solves the problems that the acrylic acid composite adhesive is poor in washing resistance and the folding part of the traditional polyurethane composite adhesive is easy to wear and delaminate, so that the reflective fabric can still keep higher retroreflection coefficient, smooth surface state and integrity of the folding part after being washed, dry-cleaned or industrially washed for many times; and the harsh use requirements of wearable reflective materials such as reflective clothing and the like are met.