178 results about "Tetrachloroethane" patented technology

Described as one aspect of the invention are polyester compositions A polyester composition comprising at least one polyester which comprises:

• • (A) a dicarboxylic acid component comprising:
    • i) 70 to 100 mole % of cyclohexanedicarboxylic acid residues or an ester thereof comprising:
      • (a) 80 to 99 mole % trans-cyclohexanedicarboxylic acid residues or an ester thereof; and
      • (b) 1 to 20 mole % cis-cyclohexanedicarboxylic acid residues or an ester thereof;
    • ii) 0 to 30 mole % of aliphatic dicarboxylic acid residues, other than cyclohexanedicarboxylic acid residues, having up to 16 carbon atoms or esters thereof, other than cyclohexanedicarboxylic acid residues; and
    • iii) 0 to 10 mole % of aromatic dicarboxylic acid residues having up to 20 carbon atoms; and
  • (B) a glycol component comprising:
    • i) 5 to 35 mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and
    • ii) 65 to 95 mole % of 1,4-cyclohexanedimethanol residues, 1,3-cyclohexanedimethanol residues, 1,2-cyclohexanedimethanol residues or esters thereof or mixtures thereof,

wherein the total mole % of said dicarboxylic acid component is equal to 100 mole %;

the total mole % of said glycol component is equal to 100 mole %;

wherein the inherent viscosity of said polyester is from 0.35 to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at 25° C.; and wherein said polyester has a Tg of from 66 to 120° C. The polyesters may be manufactured into articles.

Described as one aspect of the invention are polyester compositions comprising at least one polyester which comprises: (a) a dicarboxylic acid component comprising: (i) about 90 to about 100 mole % of terephthalic acid residues; (ii) about 0 to about 10 mole % of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms; and (b) a glycol component comprising: (i) about 20 to about 40 mole % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and (ii) about 20 to about 40 mole % cyclohexanedimethanol residues; (iii) ethylene glycol residues, and (iv) less than about 2 mole % of a modifying glycol having from 3 to 16 carbon atoms; wherein the total mole % of the dicarboxylic acid component is 100 mole %, and wherein the total mole % of the glycol component is 100 mole %; and wherein the inherent viscosity of the polyester is from 0.50 to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.25 g/50 ml at 25° C. The polyesters may be manufactured into articles.

The invention discloses a preparation method of trifluoroacetic acid low in synthesis cost. The preparation method comprises the steps of (1) preparing 1,1-difluoro tetrachloroethane from 1,1-difluoroethane or chloride thereof through ultraviolet catalysis and a chlorine reaction; (2) implementing catalytic oxidation on the 1,1-difluoro tetrachloroethane to obtain 1,1-difluoro-1-chloroacetyl chloride, wherein in the catalytic oxidation, mol ratio of the 1,1-difluoro tetrachloroethane to an oxidizing agent is 1: (2-4), dosage of the catalyst is 0.5-5% of the total weight of an reactant, and reaction temperature is 50-70 DEG C; (3) carrying out hydrogen fluoride (HF) fluoridation on the 1,1-difluoro-1-chloroacetyl chloride under the catalyst to obtain trifluoroacetyl fluoride, wherein mol ratio of the 1,1-difluoro-1-chloroacetyl chloride to the HF is 1: (2-3), reaction temperature is 40-60 DEG C, and the catalyst is either antimony or antimony pentachloride; and (4) hydrolyzing the prepared trifluoroacetyl fluoride to obtain trifluoroacetic acid.

The invention provides a preparation method of bromized polystyrene. The method is characterized in that sulfur is taken as the scavenging agent of a small amount of water in the electrophilic bromination reaction of the polystyrene and as the quencher of free radical in the electrophilic bromination reaction of the polystyrene, and the mass of the sulfur is 0.1 to 12 percent of that of the polystyrene. In the organic solvent of dichloroethane, chloroform, bromochloromethane, carbon tetrachloride or tetrachloroethane, the anhydrous aluminium trichloride, the anhydrous ferric chloride, the titanium tetrachloride, the antimonous chloride, the aluminum powder, the zinc powder or the iron powder is taken as the catalyst, the sulfur is taken as the scavenging agent of the small amount of water and as the quencher of the free radical, and the bromized polystyrene is prepared by the electrophilic bromination reaction between the polystyrene and the bromine.

The invention discloses a nitrogen-doped activated carbon catalyst and application thereof. The preparation method of the nitrogen-doped activated carbon catalyst comprises the following steps: adding a nitrogen-containing compound into water to dissolve to obtain a nitride solution, wherein the nitrogen-containing compound is one or more of ammonia water, ammonia gas, pyridine, pyrrole, imidazole, acrylamide, polyacrylamide and polyvinylpyrrolidone; adding activated carbon into the nitride solution to soak; completely drying the soaked activated carbon, and calcining in nitrogen atmosphere, thereby preparing the nitrogen-doped activated carbon catalyst. The nitrogen-doped activated carbon catalyst disclosed by the invention has very good catalysis property in reaction of catalyzing tetrachloroethane and acetylene to generate trichloro ethylene and chloroethylene and catalyzing tetrachloroethane gas phase cracking to generate trichloro ethylene.

An inflaming retarding segmented copolymer containing phosphorus and silicon and a preparation method thereof relate to the segmented copolymer. The preparation method includes mixing 9,10-dihydro-9-oxa-10- phosphaphenanthrene-10-oxide and carbon tetrachloride and adding the mixture into a solvent to obtain a mixture A; mixing methyl-hydroxyethyl acrylate and a triethylamine salt solution, adding the mixture into the mixture A, conducting filtering after reaction and conducting washing to obtain HEDOPO; dissolving the HEDOPO, dithio-benzoic acid-cumyl-ester and AIBN into the solvent, conducting freeze thawing degasification post polymerization reaction, stopping reaction through liquid nitrogen sudden cooling and conducting sedimentation to obtain a PHEDOPO macromolecule chain transfer agent; dissolving the PHEDOPO macromolecule chain transfer agent, 3-(isobutene-acyl-oxygen)-propyl-trimethoxy silane and the AIBN into tetrachloroethane, conducting continuous freeze thawing degasification post polymerization reaction, stopping the reaction through liquid nitrogen sudden cooling and conducting sedimentation through a precipitant to obtain the product the inflaming retarding segmented copolymer containing phosphorus and silicon.

The present invention provides a biaxially oriented polyester film for a backsheet of photovoltaics which exhibits an excellent hydrolysis resistance and a low shrinkage rate. The present invention relates to a biaxially oriented polyester film for a backsheet of photovoltaics, comprising a polyester having an intrinsic viscosity of 0.65 to 0.90 dL/g as measured in a mixed solvent comprising phenol and tetrachloroethane at a mass ratio of 50/50 at 23° C., a carboxyl end group content of 0 to 26 equivalents/t, and a phosphorus element content of 0 to 170 ppm, which biaxially oriented polyester film has a shrinkage rate of not more than 0.8% as measured in a longitudinal direction thereof after subjected to heat treatment at 150° C. for 30 min.

The invention provides a biodegradable textile fiber adhesive-bonded fabric to prevent adhesion after the operation and its preparing method, which belongs to the domain of medical article, and relates to the preparation of a nanometre-sized fiber adhesive-bonded fabric and the application as the anti-block film after the operation. The said adhesive-bonded fabric is prepared by adopting electrostatic spinning method, which includes preparing spin dope, dissolving the aliphatic polyester in the flux and mixing intimately to prepare the aliphatic polyester spin dope. The used flux of the spin dope can be one or compound system of two of carrene, chloroform, acetone, acetylene tetrachloride,acetic acid dimethylamide. Secondarily on the electrostatic spinning machine, by filling spin dope, electrostatic spinning and collecting superfine fibre, the aliphatic polyester superfine fibre is prepared, which carries out the adhesive-bonded fabric of electronic spinning nanometre-grade fiber and which can be used as blocking agent after the operation by the decontamination and biocidal treatment. The cloth has good flexibility and toughness, which can overcome the defect of anti-block film reported in the past. Because the degradable materials are selected, the adhesive-bonded fabric begins to degrade after about one month and completely degrade finally, which comes up to the anti-block function.

To provide an aromatic polyester which is formed into a film having excellent heat resistance, color, mechanical properties, dimensional stability and gas barrier properties and a manufacturing process thereof;

• • the aromatic polyester comprises a dicarboxylic acid component and a diol component, wherein
  • (i) the dicarboxylic acid component contains 50 to 100 mol % of a recurring unit represented by the following formula (A):

wherein R is an alkylene group having 2 to 10 carbon atoms,

• • (ii) the aromatic polyester has an intrinsic viscosity measured at 35° C. by using a mixed solvent of P-chlorophenol and 1,1,2,2-tetrachloroethane (weight ratio of 40/60) of 0.4 to 3.0;
  • (iii) the aromatic polyester has a content of a recurring unit represented by the following formula (D) of less than 10 mol %:

—O—CH₂CH₂—O—CH₂CH₂—O—  (D)

• • (iv) the aromatic polyester has a terminal carboxyl group concentration of 200 eq/ton or less; and
  • (v) the aromatic polyester has an alkali metal content of 300 ppm or less.

An object of the present invention is to provide a polybutylene terephthalate pellet capable of producing a molded product which is excellent in color tone, hydrolysis resistance, transparency and molding stability, and has a less content of impurities. A polybutylene terephthalate pellet comprises polybutylene terephthalate containing titanium in an amount of not more than 90 ppm by weight, as calculated as titanium atom, and having an end methoxycarbonyl group concentration of not more than 0.5 μeq/g, wherein said pellet has an average intrinsic viscosity of 0.90 to 2.00 dL/g and a difference in intrinsic viscosity between a central portion and a surface layer portion of the pellet is not more than 0.10 dL/g. As preferred embodiments, there is exemplified a polybutylene terephthalate pellet having an end carboxyl concentration of 10 to 25 μeq/g, an end vinyl concentration of 0.1 to 10 μeq/g, and an solution haze of not more than 5%, when measured as a turbidity value of a solution prepared by dissolving 2.7 g of polybutylene terephthalate in 20 mL of a mixed solution containing phenol and tetrachloroethane at a weight ratio of 3:2.

Polybutylene terephthalate has an intrinsic viscosity of 0.7 to 1.0 dL/g and an end carboxyl group concentration of 0.1 to 18 μeq/g, which is produced in a presence of a catalyst comprising a titanium compound and a metal compound containing a metal of Group 2A of the Periodic Table. In the preferable embodiment of the present invention, the polybutylene terephthalate has a crystallization temperature of 170 to 195° C. as measured at a temperature drop rate of 20° C./min using a differential scanning calorimeter, an end vinyl group concentration of not more than 10 μeq/g, and not more than 10% of a solution haze of a solution prepared by dissolving 2.7 g of said polybutylene terephthalate in 20 mL of a mixed solvent containing phenol and tetrachloroethane at a weight ratio of 3:2.

The polybutylene terephthalate of the present invention exhibits excellent color tone, hydrolysis resistance, heat stability, transparency and moldability as well as a less content of impurities, which is suitably applicable to films, monofilaments, fibers, electric and electronic parts, automobile parts, etc.

A disclosed method for preparing a strong-hydrophilicity PET membrane comprises the following steps: a, dissolving stannous chloride, cupric chloride or calcium chloride into an acetone solution, so as to obtain a doping solution; b, adding nanometer silicon dioxide into deionized water, performing ultrasonic dispersing, then adding a silane coupling agent under stirring condition, and adjusting pH value of the solution with a hydrochloric acid, so as to obtain a modified nanometer silicon dioxide solution; c, adding a PET particle into a mixed solvent of tetrachloroethane and phenol, heating to completely dissolve PET particle, and then adding the doping solution obtained in the steps a, so as to prepare a PET membrane forming solution, and dropwise adding the PET film forming solution to a glass slide, and then putting in a vacuum baker for drying, so as to obtain a blended membrane; and d, immersing the blended membrane obtained in the step c in the modified nanometer silicon dioxide solution obtained in the step b, and taking out and naturally drying in air after immersion is finished, so as to obtain the strong-hydrophilicity PET membrane. The prepared strong-hydrophilicity PET membrane possesses strong anti-pollution capability and possesses relatively good application prospect in the fields of water processing industry and the like.

The invention relates to a preparation method of a high-molecular copolymer cationic polyacrylamide flocculant. The product is prepared by copolymerization of acrylamide-methacrylic acid-2-oxylactone trimethylammonium chloride. Acrylamide (AM), trimethylamine hydrochloride, chloropropylene oxide, tetrachloroethane, methacrylic acid and deionized water, etc. used as raw materials undergo aqueous solution polymerization at normal pressure. During the reaction process, an additive, a polymerization inhibitor, an emulsifier and an initiator are added, and monomer concentration is controlled to 30-50%. Then, a cationic flocculant which meets usage requirements and has 2-5*106 of viscosity-average molecular weight can be prepared stably. Yield is greater than 95.0%. The whole polymerization only takes 6-7 hours to prepare the flocculant. Water quality index of sewage treated by the use of the prepared flocculant is more superior, and usability of the flocculant is approximately the same as that of a foreign similar product.

The invention discloses a grafted copolymer of cellulose and derivatives thereof and a synthesizing method of the grafted copolymer. The method comprises the steps that 1, terephthalic acid and ethylene glycol are subjected to an esterification reaction according to the molar ratio of 1:(1.2-2) under the action of a catalyst at 200 DEG C to 240 DEG C, a condensation polymerization reaction is conducted for 10 min to 80 min on the condition that the temperature ranges from 250 DEG C to 285 DEG C and the vacuum degree ranges from 100 Pa to 6,000 Pa, and hydroxylation-terminated polyethylene glycol terephthalate with the molecular weight ranging from 2,000 to 15,000 is synthesized; 2, synthesized PET is dissolved in tetrachloroethane, diisocyanate and a catalyst are added, a reaction is conducted for 3 h to 6 h at 60 DEG C to 80 DEG C, and an isocyanate-terminated prepolymer is obtained; 3, the cellulose and derivatives thereof are ultrasonically dissolved into an acetone solution, the obtained product is added into the tetrachloroethane solution of the isocyanate-terminated prepolymer, a reaction is conducted for 3 days to 7 days, and the grafted copolymer is obtained after purification is conducted. The grafted copolymer is synthesized from the cellulose and derivatives thereof and small molecular weight PET, and the advantages of being simple in process and high in grafting ratio are achieved. The obtained grafted copolymer is used for cellulose and PET blending and can improve the compatibility of the cellulose and PET.

The present invention relates to a process for making polyester compositions containing: (I) at least one polyester which comprises: (a) a dicarboxylic acid component comprising: (i) 70 to 100 mole % of terephthalic acid residues; (ii) 0 to 30 mole % of aromatic dicarboxylic acid residues having up to 20 carbon atoms; and (iii) 0 to 10 mole % of aliphatic dicarboxylic acid residues having up to 16 carbon atoms; and (b) a glycol component comprising: (i) 1 to 99 mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and (ii) 1 to 99 mole % of cyclohexanedimethanol residues; and (II) at least one thermal stabilizer chosen from at least one phosphorus compound, reaction products thereof, and mixtures thereof; wherein the total mole % of the dicarboxylic acid component is 100 mole %, and wherein the total mole % of the glycol component is 100 mole %; wherein the inherent viscosity of the polyester is from 0.35 to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.25 g/50 ml at 25° C., wherein the polyester has a Tg from 85 to 200 C.

A composition is disclosed, comprising, based on the total weight of the composition, a combination of from 44 to 80 weight percent of a thermoplastic poly(butylene terephthalate); from 20 to 50 weight percent of a thermoplastic poly(ethylene terephthalate) having an intrinsic viscosity of 0.5 to 0.8 deciliters per gram, measured in a 60:40 by weight phenol/1,1,2,2-tetrachloroethane mixture at 23° C. using a relative viscometer operating with a closed loop system, which measures the solvent and sample viscosity simultaneously; from 5 to less than 20 weight percent of a talc filler having an average largest dimension of less than 0.9 micrometers, a median particle size of less than 0.9 micrometers, or both; and from 0.1 to 0.5 weight percent of a mold release agent. The compositions are useful in the manufacture of lighting articles, which can be directly metallized without the inclusion of a base coat.

A trichloro ethylene preparation method relates to chlorinated alkene. The method comprises the following steps: 1), mixing vaporized tetrachloroethane with acetylene to form a raw material mixture gas, and controlling the molar ratio of tetrachloroethane to acetylene at 1:(0.5-2); 2), pumping the raw material mixture gas into a reactor filled with a catalyst for reaction at controlled temperature, pressure and gas flow rate, so as to allow the conversion rate of acetylene or tetrachloroethane to reach more than 70 percent; and 3), cooling the reaction product obtained in the step 2 to a room temperature by water, and separating out liquid-phase product and gas-phase product, wherein the liquid-phase product passes through a rectification column to produce a trichloro ethylene product, the gas-phase product, which is subjected to compression and freezing, is adopted for further liquification separation of vinyl chloride, and the uncooled gas after the completion of compression and freezing is used for circulating and recycling. According to the method provided by the invention, tetrachloroethane is adopted to eliminate coupling between the reaction and an acetylene addition reaction so as to form intermolecular energy direct conversion; and accordingly, the energy transfer process is simplified, the reaction energy consumption is reduced, the technological process is also simplified, and the equipment investment is lower. In addition, as for by-products, vinyl chloride is higher than hydrochloric acid in additional value.