223 results about "Binary acid" patented technology

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 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 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 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 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 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 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 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 invention discloses a hot-melt polyester with high washing resistance, which is prepared from the following raw materials: a binary acid composition, a dihydric alcohol composition, an antioxidant and a catalyst, and the molar ratio of the binary acid composition to the dihydric alcohol composition is 1: (1.8-2.2). According to the invention, the hydrophobicity and structural stability of polyester can be obviously improved, so that the reflective layer is not easy to peel off in the washing process, and good bonding strength and retroreflection coefficient are maintained after washing. The retroreflection coefficient is 180-300 cd.lx <-1 >. M <-2 > and the bonding strength is 1.2-1.8 MPa after the reflective material is washed for 50 times by an ISO 15797-part4 method, so that the reflective material meets the requirements of keeping high washing resistance and high brightness from a common mark to a high-end protective reflective material, and has a wide application prospect.

The application discloses a binary amine containing cyclohexane and norbornane structure, a preparation method and application in preparing transparent nylon. The application synthesizes a binary amine monomer containing cyclohexane and norbornane structure, and copolymerizes the binary amine monomer with aliphatic binary acid or norbornane-containing binary acid, aliphatic binary amine or norbornane-containing binary amine, to synthesize a transparent nylon containing norbornane structure. The cyclic structure with norbornane on the molecular chain can cause the regularity of the molecular chain to be destroyed, the crystallization ability to be reduced, the transparency of the nylon to be effectively improved, the processability of the nylon to be effectively improved due to the fact that a large number of cyclic structures are contained in the polymer chain and the polymer chain is a straight chain structure, the nylon has excellent thermal performance and mechanical performance, and the nylon has good solvent resistance and low dielectric constant.

This invention discloses a method and system for the continuous production of long-chain polyamides. The method includes: (1) feeding a diacid and a diamine into a prepolymerization reactor for a prepolymerization reaction, wherein the prepolymerization reactor is a horizontal screw reactor; (2) evaporating and dehydrating the product of the prepolymerization reaction; and (3) the output from step (2) entering a final polymerization reactor for continuous final polycondensation. The long-chain polyamides prepared by this method and system have a narrow molecular weight distribution, low viscosity, and stable performance. In particular, compared with batch methods, the process has a high degree of automation and high production efficiency.

The invention discloses a biodegradable anti-aging agent as well as a preparation method and application thereof, and belongs to the field of biodegradable high polymer materials. Dibasic acid, dihydric alcohol and an acid compound containing a hindered phenol structure or an ester derivative of the acid compound are used as raw materials, esterification and condensation polymerization are performed, and then esterification or ester exchange reaction is performed to prepare the macromolecular anti-aging agent, so that high dispersity and migration resistance are realized; the anti-aging agent and the biodegradable resin are mixed and directly subjected to blow molding, film forming, extrusion casting and other melt forming, the hot working process is simplified, and the loss of material mechanics and aging resistance is reduced; the phenolic hydroxyl group can capture free radicals, so that the aging resistance of the biodegradable material is remarkably improved, and the service life of the material is prolonged. The prepared anti-aging biodegradable material can be applied to thin film products, and is particularly suitable for high-performance degradable mulching films and environment-friendly packaging materials.

The application provides a polyester fiber composite hot melt batting, a preparation method thereof and a quilt. The preparation method comprises the following steps: S1. mixing diacid, dihydric alcohol and antimony trioxide, and performing esterification reaction in a protective gas atmosphere, dehydration, adding trimethyl phosphate, and performing polycondensation reaction; the diacid comprises terephthalic acid, isophthalic acid and adipic acid, and the dihydric alcohol comprises diethylene glycol and ethylene glycol; the melt is extruded, cooled, and cut into pieces; the modified polyester piece is vacuum dried and then melt-spun and stretched; S2. the modified polyester fiber is made into a fiber web together with polyester fiber and cotton fiber; S3. three layers of the fiber web are stacked and hot-pressed, and the molten modified polyester fiber bonds the three layers of the fiber web together to form a batting. The batting is safe and environmentally friendly, and the problem of environmental pollution caused by the use of adhesive in the preparation process of the synthetic batting in the prior art is avoided.

The invention discloses a modified PGA degradable material and a preparation method thereof, and belongs to the technical field of polyglycolic acid (PGA) preparation. The preparation method comprises the following steps: carrying out an esterification reaction on a mixed solution containing raw materials, an auxiliary agent and a catalyst until the mixed solution is clear and transparent, and then carrying out a condensation polymerization reaction to obtain the modified PGA degradable material, the raw material is glycollic acid and / or glycollate; the auxiliary agent is a polybasic acid auxiliary agent and / or a polyhydric alcohol auxiliary agent. Through use of the binary acid and dihydric alcohol combined auxiliary agent, the effects of reducing the melting point of the PGA and widening the processing window of the PGA are achieved, so that the PGA is smoother in the processing and forming process.

The present invention relates to a process for preparing a polyester carbonate on the basis of cycloaliphatic diacids and at least one 1,4:3,6-dianhydrohexitol and at least one further aliphatic dihydroxy compound, to a polyester carbonate and to a molding compound and a molded product containing the polyester carbonate. The polyester carbonates according to the invention are characterized by good mechanical properties and molecular weights.

The invention relates to the field of special copolyesters, in particular to a copolyester, a preparation method thereof and a transparent plastic product. The preparation method of the copolyester comprises the following steps: esterifying binary acid and polyol to form an esterified product; carrying out prepolymerization on the esterification product to form a prepolymer; carrying out first polycondensation on the prepolymer to form a first polycondensation product; adding an anthraquinone coloring agent into the first polycondensation product, and carrying out second polycondensation to form copolyester; the temperature of the first polycondensation and the temperature of the second polycondensation are 260-320 DEG C respectively and independently; the time of the first polycondensation is 1-6 hours; the time of the second polycondensation is 0.5-2 hours. The anthraquinone coloring agent is introduced in the later stage of polycondensation, so that the copolyester with high mechanical strength, low yellowness and high brightness can be prepared, and the application of the polyester in the field with high transparency requirements is realized.

The invention relates to a multiphase synergistic high-strength and high-elasticity polyester elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer material synthesis. The preparation method comprises the following steps: weighing dibasic acid I, dihydric alcohol and hydroxyl-terminated polyether, carrying out esterification reaction on the carboxyl-terminated polyether and the hydroxyl-terminated polyether to form an ester, and carrying out transesterification reaction on the hydroxyl-terminated polyether of the ester to prepare a polyester oligomer; adding caprolactam, carrying out a ring-opening reaction to generate aminocaproic acid, and carrying out an esterification reaction on aminocaproic acid and part of the polyester oligomer to form an amino-terminated and hydroxyl-terminated multi-component oligomer; adding binary acid II and a solvent, and carrying out salt forming reaction on the terminal carboxyl group and the terminal amino group at low temperature; and carrying out condensation polymerization in three forms, namely ammonium salt dehydration to form amido bonds, dehydration of terminal carboxyl groups and terminal hydroxyl groups to form ester bonds, and dihydric alcohol removal between the terminal hydroxyl groups to form ester bonds, so as to prepare the multi-block polyester elastomer. According to the invention, the interaction of hydrogen bonds is enhanced, and the tensile strength, tensile modulus and elastic recovery capability of the elastomer are improved.

The application provides a kind of bio-based polyamide polyester and its preparation method and application.The bio-based polyamide polyester is synthesized by using diacid containing amide bond, hydrophobic side chain and biological carbon atom, wherein the hydrophobic side chain reduces the crystallinity of the polyamide polyester and improves its optical transparency; the amide bond gives it excellent temperature resistance, wear resistance and mechanical properties, and the ester bond gives it good impact resistance, higher modulus and strength. The bio-based polyamide polyester provided by the application has the advantages of both engineering plastic polyamide and general plastic polyester, and is a new type of bio-based polymer material, which has potential application value in packaging materials or solar panels and other fields.

This invention relates to the field of polyesters, and discloses a copolyester, its preparation method, and its application. The copolyester contains structural unit A as shown in formula (I), structural unit B as shown in formula (II), and structural unit C as shown in formula (III). The preparation method includes: (1) under esterification reaction conditions, mixing a modified monomer having the structure shown in formula (I), a diacid monomer having the structure shown in formula (II), a diol monomer having the structure shown in formula (III), and a catalyst to carry out a first-stage reaction to obtain a prepolymer; (2) under polycondensation reaction conditions, carrying out a second-stage reaction on the prepolymer. This copolyester has good mechanical properties while improving its flame retardant properties, and can also improve the damping effect. Formula (I); Formula (II); Formula (III).

The invention provides aliphatic-aromatic polyester and application thereof. The aliphatic-aromatic polyester comprises binary acid residues and dihydric alcohol residues, the diacid residues comprise terephthalic acid residues and at least one aliphatic diacid residue; the dihydric alcohol residues comprise 1, 4-butanediol residues; the number-average molecular weight of the aliphatic-aromatic polyester and the mass percentage content of an oligomer with the number-average molecular weight of less than or equal to 1000 in the aliphatic-aromatic polyester, which is determined by GPC (Gel Permeation Chromatography), meet the following relation: Mn / q is 50000-110000; wherein Mn is the number-average molecular weight of the aliphatic-aromatic polyester, and q is the mass percentage content, measured by GPC, of the oligomer with the number-average molecular weight smaller than or equal to 1000. The shrink film prepared from the aliphatic-aromatic polyester has excellent thermal shrinkage performance.

The invention provides a heat-resistant poly (aromatic ester-ether)-based biodegradable material polyester and a preparation method thereof. The method comprises the following steps: by taking an allyl monomer containing an aromatic ester structure and a vinyl ether dihydric alcohol monomer containing an ether structure as main monomers, adding an N-substituted maleimide monomer and a thiol molecular weight regulator, synthesizing a heat-resistant poly (aromatic ester-ether) dihydric alcohol precursor through emulsion polymerization, and further, preparing the heat-resistant poly (aromatic ester-ether) dihydric alcohol through a one-step method. And carrying out esterification and polycondensation on the aromatic ester, aliphatic dibasic acid, a polyfunctional cross-linking agent and a stabilizer under the action of a catalyst to prepare the heat-resistant poly (aromatic ester-ether)-based biodegradable material polyester. According to the method, the generation of a by-product tetrahydrofuran (THF) is fundamentally avoided, meanwhile, the material is endowed with excellent biodegradability and heat resistance, and an effective scheme is provided for solving the problem of white pollution caused by difficult degradation and recovery after plastic products are discarded.

The application discloses a kind of bio-based dimer amine type polyamides and the preparation method of flexible sensor thereof, the preparation of the polyamide includes: under inert gas protection, bio-based dimer amine is added with binary acid according to mole ratio in reaction container, precondensation is carried out by controlling reaction temperature and stirring rate, and pre-polymer is generated;Melt condensation is carried out under vacuum condition, and high molecular weight bio-based dimer amine type polyamide is obtained.The polyamide is physically blended with conductive filler, and flexible sensor can be prepared.The application accurately controls molecular weight by regulating degree of polymerization, and the sensing performance is optimized by combining blending process, and the obtained sensor has excellent flexibility and high sensitivity;Its preparation process does not need complex equipment, and process is safe and simple, and raw material is derived from renewable vegetable oil, meets green chemistry concept;The polyamide product is endowed with outstanding resilience due to long branched chain dimer amine structure, and has significant application potential in the field of wearable health monitoring, human-computer interaction and other flexible sensing.