536 results about "Diethylene glycol" patented technology

The invention discloses preparation of a high-uniformity cerium oxide abrasive material and application of the high-uniformity cerium oxide abrasive material in a chemical mechanical polishing solution. According to a method, cerium nitrate or cerium oxalate is used as a cerium source, a cationic or nonionic surfactant is used as a structure-directing agent, and the high-uniformity cerium oxide abrasive material is prepared in a mixed solvent system formed by water and isopropanol or water and diethylene glycol according to a specific volume ratio. The preparation method comprises the following steps: regulating the particle size and the morphology structure through a solvothermal reaction, carrying out cleaning, drying and high-temperature calcination treatment on a reaction product to obtain sphere-like cerium oxide nano-particles with high particle size concentration ratio, moderate surface roughness and good dispersity, adding cerium oxide powder into deionized water, and carrying out ultrasonic dispersion to obtain the spherical cerium oxide nano-particles. And sequentially adding a dispersing agent and amino acid while stirring, uniformly stirring, fixing the volume, and adding a pH regulator to enable the solution to be weakly acidic, thereby obtaining the chemical mechanical polishing solution. The cerium oxide submicron powder which is different in surface appearance, particle size and distribution uniformity is prepared by adjusting the solvent ratio and other reaction conditions.

The invention belongs to the technical field of polyurethane, and particularly relates to a low-swelling-rate hydrophilic polyurethane sponge composite material as well as a preparation method and application thereof. The low-swelling-rate hydrophilic polyurethane sponge composite material is prepared from a component A and a component B according to the mass ratio of 100: (50-55), and the component A comprises the following raw materials: a foaming agent, wollastonite powder, an antibacterial agent, emulsifying wax and a polyether type cross-linking agent; the component B comprises polyether ester polyol and toluene diisocynate; the polyether type cross-linking agent is prepared by taking triethanolamine as an initiator and carrying out ring-opening polymerization reaction with EO; the polyether ester polyol is prepared by taking polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid as raw materials through esterification reaction. The hydrophilic polyurethane sponge prepared from the composite material is good in hydrophilicity, high in aperture ratio, fine and smooth in foam hole, low in swelling ratio and excellent in mechanical property.

The invention relates to a process method for separating out-of-service photovoltaic modules, and belongs to the field of organic chemical industry and the field of efficient recycling of secondary resources. The method comprises the following steps: placing the retired photovoltaic module and an organic solvent containing diethylene glycol monobutyl ether in a dynamic fluid circulation system for layering treatment; the dynamic fluid circulation system controls the organic solvent to circularly flow on the surface of the decommissioned photovoltaic module to complete layering of the decommissioned photovoltaic module, and waste liquid and solids are obtained through solid-liquid separation; the solid object contains glass, a crystalline silicon battery piece and a back plate. According to the method, an appropriate solvent is selected and a flow field is optimized, so that efficient layering of an EVA packaging layer and stripping of a photovoltaic module are realized, and complete recovery of glass, a crystalline silicon battery piece and a back plate is ensured.

The present invention relates to the technical field of plastic recycling, and disclosed are a method for preparing a regenerated resin from PET recyclate and a use thereof. The method comprises the following steps: mixing PET recyclate, a polyol, and a catalyst; carrying out elevated temperature reaction; after cooling, adding a polybasic acid or a polybasic acid anhydride for reaction; and after the reaction is finished, cooling to obtain a regenerated resin. The polyol is selected from at least one of diethylene glycol, tripropylene glycol, and polyethylene glycol; the average functionality of the polybasic acid is greater than 2; and the catalyst is selected from at least two of zinc acetate, manganese acetate, and tetrabutyl titanate. According to the present invention, the regenerated resin is applied to the preparation of water-based ink, so that the water-based ink achieves the same printing performance as acrylic resin ink. In the method of the present invention, no waste is generated during polymerization, achieving a 100% recycling rate for waste plastic. Fossil raw materials are saved, and PET recyclate is also fully utilized, achieving the objective of turning waste into wealth.

The invention discloses an ether polymerization inhibitor special for a butadiene extraction system and a preparation method of the ether polymerization inhibitor. The ether polymerization inhibitor comprises the following raw materials: a polymerization inhibitor intermediate, a solvent and a dispersing agent, the production process comprises the following steps: preparing a polymerization inhibitor intermediate, preparing a solvent, compounding, feeding and mixing, filtering, removing impurities and detecting. According to the method, firstly, a polymerization inhibitor 701 and diethylene glycol normal pressure etherification process is adopted, and beta-hydroxyethyl methyl ether is introduced to seal a terminal group, so that the power consumption is reduced, the generation of byproducts is inhibited, the solubility of an intermediate acetonitrile is improved to be greater than or equal to 30g / L, and the anti-interference performance is greatly enhanced; the solvent doped with a small amount of silane modified nano diatomite is prepared, impurities can be adsorbed, metal ions can be chelated, the dispersing agent can be assisted to be evenly distributed, the problems that a pure water solvent is single in function and the dispersing agent is prone to agglomeration are solved, and the polymerization inhibition efficiency and the stability of an extraction system are guaranteed.

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

A polymerization raw material obtained by the depolymerization of waste polyester is disclosed. The polymerization raw material contains recycled bis(2-hydroxyethyl) terephthalate in which the contents of acetate-based ester compounds and diethylene glycol ester compounds are adjusted to specific levels. The polymerization raw material is excellent in purity and quality, and free from the problem that thermal resistance characteristics deteriorate in the polymerization of a polymer from the recycled monomer.

The invention relates to the field of protective films, and discloses a liquid crystal display light guide plate TPE protective film and a preparation method thereof, the protective film comprises modified SBS, polypropylene, modified nano calcium carbonate, a lubricant and a plasticizer; the modified nano calcium carbonate is prepared by grafting a modified additive on the surface of nano calcium carbonate through chemical reaction and then coordinating with copper ions; the modified additive is prepared by preparing a chlorinated silicon-containing intermediate by using dichlorodiphenyl silane, diethylene glycol and cyanuric chloride as raw materials and then grafting a component I and 3-aminopropyltrimethoxysilane; the component I is prepared from 5-chloromethylthiazole and p-phenylenediamine through a reaction, and the modified SBS is prepared from epoxidized SBS and nano titanium dioxide subjected to amination modification by 3-aminopropyltriethoxysilane through a ring-opening reaction. The film material is endowed with excellent tensile strength, aging resistance and antibacterial and flame-retardant effects.

The present invention discloses a kind of ultrafine slag powder grinding aid and preparation method thereof, belong to the technical field of grinding admixture. The grinding aid of the present invention is prepared by including the following raw materials in parts by weight: 20-40 parts of small molecule polyether polyols, 10-20 parts of ethylene glycol and diethylene glycol mixed solution, 5-10 parts of water glass, 0.1-0.5 parts of sodium hexadecylsulfonate, 0.1-0.5 parts of defoamer and 20-40 parts of water. The present invention adopts ethylene oxide and glycolic acid to synthesize small molecule polyether polyol oligomers, which can adapt to slag of different particle sizes, achieve good adsorption and dispersion, effectively solve the agglomeration problem of slag differential during ultrafine grinding, and have a good grinding aid effect on slag. The obtained grinding aid can effectively improve the efficiency of ultrafine grinding of slag powder, shorten the time of ultrafine grinding, and increase the output by 20% per hour.

The invention belongs to the technical field of textile dyeing and finishing, and particularly relates to a long-acting hydrophilic, soft, fluffy and washable silicone oil composition as well as a preparation method and application thereof. The silicone oil composition is prepared from the following raw materials in parts by mass: 20 parts of modified silicone oil, 0.5 to 2.5 parts of anionic surfactant, 0.5 to 2 parts of nonionic surfactant, 0.1 to 1 part of polyhexamethylene biguanide hydrochloride, 0.2 to 0.5 part of glacial acetic acid and 76 to 79 parts of water, the modified silicone oil is prepared from the following raw materials: octamethylcyclotetrasiloxane, tetramethylethylenediamine, secondary aminated polyether amine, allyl epoxy polyether, polyether amine, allyl glycidyl ether, isopropanol, diethylene glycol butyl ether, an end-capping reagent and a catalyst. The silicone oil composition provided by the invention can endow a fabric with a long-acting hydrophilic effect, excellent hand feeling, low yellowing and washability; and the dye has excellent stability, is safe and stable to use, and does not influence the colored light of the dyed fabric.

The invention discloses a liquid organic hydrogen storage material and application thereof, and belongs to the technical field of liquid hydrogen storage. The liquid organic hydrogen storage material is an organic compound with a diol structure, the organic compound with the diol structure is one of 1, 5-pentanediol, diethylene glycol and diethanol amine, the liquid organic hydrogen storage material is low in melting point, high in boiling point, safe and low in toxicity, hydrogen is generated through liquid-phase dehydrogenation lactonization, the available hydrogen content is about 3.8%, and the 1, 5-pentanediol structure is one of 1, 5-pentanediol, diethylene glycol and diethanol amine. The 1, 5-pentanediol can be prepared from a biomass platform compound furfural through hydrogenation and hydrogenolysis, and the source is rich; the diethylene glycol and the diethanol ammonia are bulk chemical products, easy to obtain and low in price, and the liquid organic hydrogen storage material has high industrial application value.

The invention relates to the field of solid electrolyte preparation, and particularly discloses a solid electrolyte preparation method, a solid electrolyte and a battery, and the solid electrolyte preparation method comprises the following steps: step 1, synthesis of a pyridyl covalent organic framework (PCOF): dissolving 1, 3, 5-triformyl benzene and 2, 6-diaminopyridine pyridyl amine monomers in a mixed solvent of m-trimethylbenzene and 1, 4-dioxane, and stirring to obtain a solid electrolyte solution; the preparation method comprises the following steps: adding an acetic acid catalyst under the protection of argon, reacting at 100-130 DEG C for 48-96 hours, and then carrying out centrifugal separation, cleaning, neutralization, secondary cleaning and drying to obtain PCOF powder; by introducing the flexible diethylene glycol (DEG) group with relatively high polarity, the interface contact between the DEG-PMCOF and the lithium metal electrode is tighter, the interface impedance is effectively reduced, the overall performance of the battery is improved, meanwhile, the overall toughness of the material is remarkably enhanced through the flexible characteristic of the DEG, the problems of crack generation and layering in the cycle process of the battery are reduced, and the service life of the battery is prolonged. The mechanical property and the long-term stability of the material are improved.

The invention relates to the technical field of paint removers, and particularly discloses a paint removal composition, a paint stain cleaning agent and application of the paint stain cleaning agent. The paint stain cleaning agent provided by the invention is prepared from the following components in parts by weight: 30 to 40 parts of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 200 to 300 parts of caustic soda flakes, 140 to 170 parts of sodium alcohol ether sulphate, 160 to 180 parts of sodium xylene sulfonate, 400 to 450 parts of monoethanolamine, 1100 to 1300 parts of diethylene glycol monobutyl ether, 250 to 300 parts of limonene, 40 to 100 parts of saponin extract and 3700 to 3900 parts of water, the saponin extract is selected from one or more of soapnut saponin, fenugreek saponin and aescin; the invention further provides a paint stain cleaning agent prepared from the paint removal composition and application of the paint stain cleaning agent to cleaning of protective clothing. The paint stain cleaning agent provided by the invention can quickly permeate into paint and the contact surface of the paint and protective clothing, so that the paint on the surface of the protective clothing is dissolved and effectively stripped.

The invention discloses a method for preparing calcium hydroxide with a high specific surface area by digesting calcium oxide, and relates to the technical field of preparation of calcium hydroxide with a high specific surface area. The method is characterized in that diethylene glycol / triethanolamine / magnesium chloride is adopted as a compound digestion aid through two processes of wet digestion and dry digestion; and calcium hydroxide with high specific surface area can be controllably prepared. The specific surface area of the calcium hydroxide prepared through wet digestion can reach 70 m < 2 >. G <-1 > or above, the specific surface area of the calcium hydroxide prepared through dry digestion is 45 m < 2 >. G <-1 > or above, the reaction activity of the calcium hydroxide is effectively improved, and the novel controllable method for preparing the calcium hydroxide with the high specific surface area is provided.

The invention belongs to the technical field of antibacterial polyurethane, and particularly relates to a preparation method of antibacterial polyurethane foam. The preparation method comprises the following steps: (1) adding 0.5-1 part by weight of water, 1-3 parts by weight of a catalyst, 1-6 parts by weight of a foam stabilizer and 0.5-1 part by weight of an inorganic antibacterial filler into 100 parts by weight of antibacterial polyether under the condition of 25-35 DEG C to obtain a combined material; (2) adding 100-110 parts by weight of polyisocyanate into the combined material obtained in the step (1) under the condition of 25-35 DEG C, stirring, foaming and curing to obtain polyurethane foam; the number-average molecular weight of the antibacterial polyether is 550-650, guanidine hydrochloride, cane sugar, diethylene glycol and ethidene diamine are used as initiators and react with epoxypropane to prepare the antibacterial polyether, and the mass fraction of epoxypropane in the antibacterial polyether is 75-80%. The foam prepared by the method is high in strength and high in antibacterial property.

The invention provides polyurethane wet resin for soft embossing-resistant clothing leather as well as a preparation method and application of the polyurethane wet resin. The preparation raw materials of the polyurethane wet resin comprise the following components in parts by weight: 0.002-0.004 part of inorganic acid; 165 to 251 parts of polyester polyol; 42 to 64 parts of isocyanate; 7-11 parts of small molecular alcohol; 24 to 37 parts of an auxiliary agent; 560 to 840 parts of a solvent; the polyester polyol simultaneously comprises polyester polyol of an adipic acid-ethylene glycol-1, 4-butanediol system, polyester polyol of an adipic acid-phthalic acid-ethylene glycol-1, 4-butanediol system, polyester polyol of an adipic acid-phthalic acid-ethylene glycol-1, 4- The polyester polyol is prepared from polyester polyol of a 1, 4-butanediol system, polyester polyol of an adipic acid-diethylene glycol-ethylene glycol system, polyester polyol of an adipic acid-diethylene glycol system and polyester polyol of an adipic acid-ethylene glycol system. The polyurethane wet resin disclosed by the invention has the characteristics of good finger-pressing resilience, thick and soft hand feeling, good black color developing property and the like, and the prepared synthetic leather keeps good high-temperature embossing resilience and combines the thick and soft hand feeling, so that the additional value of the product is obviously improved.

A polyester-based woven hook-and-loop fastener including: a woven-fabric and engaging elements, in which the woven-fabric in which a polyethylene terephthalate-based multifilament yarn is a warp yarn and a polyester-based heat-fusible multifilament yarn is a weft yarn is a woven base fabric, a yarn for the engaging elements made of at least one kind selected from the group consisting of a polyethylene terephthalate-based monofilament yarn and a polyester-based multifilament yarn, is woven in parallel to the warp yarn into the woven base fabric, the engaging elements that are formed of the yarn for the engaging elements, that are made of at least one kind selected from the group consisting of a large number of hook shapes and loop shapes, and that rise up from a front face of the woven base fabric, exist on the front face of the woven base fabric, bases of the engaging elements are fixed to the woven base fabric by a melt-solidified material of a heat-fusible component of the the polyester-based heat-fusible multifilament yarn, and the polyethylene terephthalate-based multifilament yarn is made of a copolymerized polyethylene terephthalate containing, as copolymerization components, 1.0 to 2.0 mol % of isophthalic acid with respect to a total amount of dicarboxylic acids and 2.0 to 3.5 mol % of diethylene glycol with respect to a total amount of diols.

The invention relates to the field of chemical synthesis, in particular to a preparation method of chlorinated alkyl polyphosphate, which comprises the following steps: mixing diethylene glycol and gamma-valerolactone, slowly adding phosphorus oxychloride, and reacting at 20-50 DEG C to generate a reaction solution containing an intermediate; adding gamma-valerolactone and an IL (at) MOFs-P catalyst into the reaction solution, slowly adding epoxypropane, and reacting at 130-150 DEG C in a nitrogen atmosphere to generate a target product mixed solution; and recovering gamma-valerolactone through distillation, centrifugally separating the catalyst, regenerating and recycling, and purifying a crude product to obtain a final product. The green solvent gamma-valerolactone is adopted and recycled, the IL-coated MOFs-P catalyst is high in activity and can be recycled, side reactions are reduced by accurately controlling reaction conditions, the product yield reaches 90% or above, the purity exceeds 98%, and the method has the advantages of being green, environmentally friendly, economical and efficient.

The invention relates to the field of cosmetics, in particular to skin moistening oil containing a water-soluble active matter and a preparation method of the skin moistening oil. The skin moistening oil of the water-soluble active matter is prepared from the following raw materials in parts by mass: 0.1-1 part of a phase A, 3-15 parts of a phase B and 80-100 parts of a phase C, wherein the phase A is a water-soluble component, and the water-soluble component comprises one or more of deionized water, VC ethyl ether and nicotinamide; the phase B is a solvent, and the solvent comprises one or more of ethyoxyl diethylene glycol, 1, 2-pentanediol, isopentanediol and isostearic acid; the phase C is skin moistening oil, and the skin moistening oil comprises caprylic / capric triglyceride. The skin moistening oil product provided by the invention has the advantages of clear and transparent appearance, good fluidity, excellent stability, no need of adding a surfactant or a solubilizer, mildness, no irritation, simple process, controllable cost, good practical value and good application prospect.

The present invention is directed to methods for improving the therapeutic outcome of treatment with roflumilast. The therapeutic outcome is improved by consistent delivery and / or a longer plasma half-life of a topically administered roflumilast composition. The roflumilast composition preferably includes dicetyl phosphate, ceteth-10 phosphate, diethylene glycol I monoethyl ether, and / or hexylene glycol.

The invention discloses a highly flame-retardant and environmentally friendly modified PVC material without antimony trioxide and a preparation process thereof, and belongs to the technical field of modified PVC material preparation. The highly flame-retardant and environmentally friendly modified PVC material without antimony trioxide is composed of the following components in parts by weight: 40-60 parts of PVC, 2-8 parts of PVC modifier, 10-15 parts of microcapsule flame retardant, 2-8 parts of tetrahydrofuran, 0.5-2.1 parts of antioxidant, 2-4 parts of coupling agent, wherein the PVC modifier is prepared from diethylene glycol monovinyl ether, propylene acetate, azobisisobutyronitrile, ethyl acetate and methyl tert-butyl ether, and the microcapsule flame retardant is prepared from sodium hydroxide, choline chloride, phytic acid, corn starch, polyethylene glycol, toluene diisocyanate and pentaerythritol. PVC is modified using a PVC modifier, and a microcapsule flame retardant is added at the same time, and the prepared environmentally friendly modified PVC material has excellent flame retardant effect, rheology and toughness.

The invention relates to the technical field of high polymer materials, and provides a hard foaming polyester material and a preparation method thereof, the hard foaming polyester material comprises the following raw materials by mass: 10000 to 15000 parts of 1, 4-butanediol, 800 to 850 parts of diethylene glycol, 9000 to 11000 parts of terephthalic acid, 6000 to 8000 parts of isophthalic acid, 10 to 15 parts of a catalyst, and 15 to 25 parts of an antioxidant. The rigid acid, the flexible acid, the rigid alcohol and the flexible alcohol are jointly used, efficient environment-friendly catalysis and anti-aging components are combined, and a hard foaming polyester material system which is high in strength, high in melting point, uniform in foam hole, high in heat stability, environment-friendly and controllable is established.

The invention relates to the technical field of thermoplastic plastics, in particular to modified PCTG polyester and a preparation method and application thereof, and the modified PCTG polyester is formed by copolymerization of terephthalic acid, isophthalic acid, 1, 4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol. The problems that existing PCTG is insufficient in temperature resistance, transparency, mechanical property and chemical corrosion resistance can be solved.

The invention relates to the technical field of organic silicon catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof, the catalyst is prepared from a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethoxysilane, propylene carbonate and diethylene glycol dibutyl ether; the preparation method comprises the steps of solvent water removal, electronic relay adduct preassembly, active metal introduction, thermal induction aging and the like. An electron-deficient coordination center is constructed through a step-by-step process, the electron cloud density of the platinum center is reduced by utilizing the Lewis acid characteristic of triphenyl borate, and the solvent cage effect of propylene carbonate is matched, so that the high-temperature tolerance of the catalyst is improved, and the generation of platinum black is effectively inhibited; meanwhile, the solubilizing and bridging effects of diethylene glycol dibutyl ether are utilized, the compatibility problem of a high-polarity component and a non-polar silicone oil matrix is solved, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

The invention belongs to the technical field of fibers, and particularly relates to a preparation method of bionic tire fat fibers, and the preparation method comprises the following steps: preparation of 6-O-carboxymethyl chitosan, preparation of a modified chitosan monomer, preparation of a core material solution, preparation of a bionic tire fat composite material, blending, spinning and post-treatment. Chitosan is used for modifying carboxymethyl and unsaturated double bonds and then copolymerized with diethylene glycol monovinyl ether to coat the bionic tire fat component, so that the bionic tire fat component is protected and prevented from being lost due to the influence of an acid-base environment and temperature in the fiber preparation process, and meanwhile, a good slow-release effect is achieved; after multiple times of washing, the loss is less, and the functionality is durable and stable; through detection, the loss rate of the bionic body fat component in the fiber preparation process is lower than 1%, the loss rate of the bionic body fat component is lower than 5% after the fiber is washed with water for 50 times, and a good slow-release effect is achieved.

The invention relates to the technical field of coatings, in particular to an epoxy resin-based water-based corrosion-resistant and weather-resistant coating and a preparation method of the epoxy resin-based water-based corrosion-resistant and weather-resistant coating. A composite modified inorganic filler composed of siloxane modified epoxy resin, modified polysiloxane, rare earth cerium modified graphene, silane modified calcium carbonate oligomer and surfactant-silane composite modified kaolin is compounded; a composite modifier consisting of propylene glycol diacetate, dipropylene glycol butyl ether and diethylene glycol butyl ether and an isopropanol / water mixed solvent are matched, so that the contradiction between the water resistance and the structural stability of the existing water-based paint is effectively solved, and the anticorrosion durability, the weather resistance, the mechanical strength, the adhesive force and the storage stability of the coating are remarkably improved; good water-based dispersity and construction applicability are kept, and the coating can be suitable for long-acting corrosion protection of base materials such as metal components, industrial equipment and building outer walls and has a wide application prospect.

The invention discloses a detection method for simultaneously determining ethylene glycol and diethylene glycol in cetirizine hydrochloride drops, which comprises the following steps: step 1, setting chromatographic conditions: heating to 220 DEG C at a rate of 20 DEG C / min by using a capillary column with 6% propylphenyl-94% dimethyl polysiloxane as a stationary liquid, and maintaining for 10 minutes; step 2, solution preparation: preparing a blank solvent, a reference solution and a test solution; step 3, determination: taking the blank solvent, the reference substance solution and the test solution for sample introduction analysis, and recording a chromatogram; step 4, limit: calculating by peak area according to an external standard method, wherein the content of ethylene glycol is not more than 0.062%, and the content of diethylene glycol is not more than 0.025%; the method disclosed by the invention is simple, convenient, rapid, high in accuracy and good in specificity, can be used for simultaneously determining the contents of ethylene glycol and diethylene glycol in the cetirizine hydrochloride drops, and is suitable for quality research and control of the cetirizine hydrochloride drops.

Provided is a polyester film containing a first polyester resin that includes a first acid unit and a first alcohol unit. The first acid unit includes 90 mol% or more of terephthalic acid units with respect to the total amount of the first acid unit, and the first alcohol unit includes 50 mol% or more of ethylene glycol units, 5-40 mol% of 2,2-dimethyl-1,3-propanediol units, and 0.1-5 mol% of diethylene glycol units with respect to the total amount of the first alcohol unit. The content of the first polyester resin is 80 mass% or more with respect to the total amount of the polyester film, and the thickness of the polyester film is 25-100 μm.

The application discloses a preparation method of a low-TCR low-cost ceramic heating tube, and comprises the following steps: (1) preparing an organic carrier: 60 parts by weight of terpineol, 20 parts by weight of ethyl cellulose, 10 parts by weight of a binder and 10 parts by weight of diethylene glycol acetate are placed into a magnetic stirrer and uniformly dissolved and mixed; (2) weighing metal powder: Mo: 50-70 parts by weight; Re: 20-30 parts by weight; Mn: 0-5 parts by weight; Cr: 10-15 parts by weight; by adopting Mo, Re, Mn and Cr in a specific ratio as the metal powder, the traditional mode of adopting metal ruthenium powder or a mixture of metal ruthenium powder and other common metal powder is replaced, the prices of Mo, Re, Mn and Cr are low, so that the preparation cost of the ceramic heating tube is effectively reduced, the purpose of low TCR is achieved, and the scale production is facilitated; meanwhile, the ceramic heating tube prepared by adopting the application has higher overall bending strength, and can better meet the use requirement.

The invention provides a water-based fully-synthetic cutting fluid. The water-based fully-synthetic cutting fluid comprises the following raw materials in percentage by mass: 3-8% of boric acid, 1-5% of sodium dihydrogen phosphate, 5-10% of citric acid, 1-5% of graphene, 0.5-3% of triethyl phosphate, 2-8% of diethylene glycol, 5-15% of an antirust agent, 2-6% of polyoxyethylene stearate, 1-3% of a bactericide, 0.1-1% of a defoaming agent, 0.5-2% of a settling agent and the balance of water. The average sheet diameter of the graphene ranges from 120 nm to 160 nm. According to the graphene-containing water-based fully-synthetic cutting fluid disclosed by the invention, by optimizing a formula, particularly further adding a proper amount of triethyl phosphate and graphene into a proper formula, the lubricating property and the corrosion resistance of the water-based fully-synthetic cutting fluid can be effectively improved, and the service life is prolonged.