34 results about "Vinylchloride polymer" patented technology

The invention discloses a phosphate surfactant, of which the chemical formula is: H-(CF2)m-CH2-O-(CH2CH2O)n-PO(OM)2, wherein m is equal to 2, 4, 6 or 8, n is equal to 0 or 1, and M is NH4+ or Na+. The invention also discloses a method for preparing trifluorochlor oethylene polymer emulsion or solid with the phosphate surfactant as an emulsifier. The surfactant can be used for emulsion polymerization of fluoride-containing monomer. Used as the emulsifier, the surfactant can achieve a high polymerization rate, good dispersion stability, high yield, excellent copolymerization performance and/or multiple particle sizes (including small particle size). Besides, the method can realize polymerization by only using conventional equipment, is easy and convenient to operate and has a low cost, and does not cause environmental pollution during and after reaction.

There is provided a process for producing a vinyl chloride-based polymer, in which a suspension polymerization of either vinyl chloride monomer, or a mixture of vinyl chloride monomer and another copolymerizable monomer, is conducted in a polymerization vessel fitted with a reflux condenser, the process including the steps of: (A) adding to the reaction mixture a high-activity, oil-soluble polymerization initiator, with a 10-hour half life temperature of no more than 40° C. at a concentration of 0.1 mol/L in benzene, for a specified time within a period from the commencement of heat removal using the reflux condenser through to completion of the polymerization, and (B) adding an antioxidant either continuously or intermittently to the reaction mixture at least during the period from the commencement of addition of the high-activity, oil-soluble polymerization initiator through to completion of that addition. According to the present invention, the process for producing a vinyl chloride-based polymer by aqueous suspension polymerization in a polymerization vessel fitted with a reflux condenser can be improved, the heat removal capability can be utilized effectively to shorten the polymerization time, and a high quality vinyl chloride-based polymer with an extremely low level of fish eyes can be produced.

A production process for a vinyl chloride polymer is proposed in which either vinyl chloride, or a monomer mixture comprising vinyl chloride, is polymerized in an aqueous medium inside a polymerization vessel, while heat removal is conducted using a reflux condenser. In this process, the liquid level of the contents inside the polymerization vessel is monitored using an electric wave liquid level gauge, which is disposed on the polymerization vessel and radiates microwaves with a frequency of 4 to 20 GHz. The operating efficiency of the reflux condenser can be improved, and the quantity of heat removed by the reflux condenser can be increased. Furthermore, the time required to complete the process, including the raw material addition step and/or the washing step conducted following completion of the polymerization, can be shortened.

An image-forming method: by superposing a heat-sensitive transfer sheet on a heat-sensitive transfer image-receiving sheet so that a receptor layer can be contacted with a thermal transfer layer; and providing thermal energy in accordance with image signals; in which the heat-sensitive transfer image-receiving sheet comprises the receptor layer containing one of polyester and/or polycarbonate polymers, vinyl chloride polymers and/or a polymer latex; and

in which the heat-sensitive transfer sheet comprises the thermal transfer layer containing a dye represented by formula (1) or (2):

wherein, X¹⁴¹ represents an oxygen atom, a sulfur atom, or NR¹⁴⁶; X¹⁴² represents a hydroxyl group, a mercapto group, or NHR¹⁴⁷; R¹⁴¹ to R¹⁵⁴ each represent a hydrogen atom or a substituent; A¹⁵¹ represents a group of atoms necessary to form a hetero ring together with the two carbon atoms; and n¹⁵³ represents an integer of 0 to 4.

The invention discloses a preparation method of a vinyl chloride polymer ionic liquid porous membrane. The preparation method comprises the following steps: preparing vinyl chloride polymer ionic liquid (PVC-mimX), and then preparing the vinyl chloride polymer ionic liquid porous membrane by adopting an immersion precipitation phase inversion process. According to the preparation method of the vinyl chloride polymer ionic liquid porous membrane, the process is simple, raw materials are easily available, the reaction time is short, the reaction condition is mild, no expense instrument is required, the industrial implementation can be realized easily, the prepared vinyl chloride polymer ionic liquid porous membrane has the good antifouling property, good physical properties of a polyvinyl chloride membrane are kept, and the vinyl chloride polymer ionic liquid porous membrane has good stability and has the high-efficiency separation characteristic.

A heat-sensitive transfer image-receiving sheet, containing, on a support, a receptor layer containing at least one of vinyl chloride polymers, and an intermediate layer containing hollow polymer particles between the support and the receptor layer.

The invention discloses a method for preparing mesopore-micropore composite porous carbon on the basis of vinylidene chloride. The method includes steps of 1), adding 1,4-dioxane, vinylidene chloride, polyethylene-glycol-based macromolecular RAFT (reversible addition-fragmentation transfer) reagents and azodiisobutyronitrile into a reaction kettle, stirring the reactants at the room temperature to dissolve and mix the reactants together, charging nitrogen, removing oxygen, heating the mixture, enabling the reactants to have polymerization reaction to generate reaction liquid, adding precipitating agents into the reaction liquid, depositing the reaction liquid to obtain deposits, separating the deposits and drying the separated deposits to obtain segmented copolymers comprising vinylidene chloride polymers (copolymers) and polyethylene glycol; and 2), placing the segmented copolymers into a crucible, placing the crucible in a high-temperature furnace, heating the high-temperature furnace, keeping the temperature of the high-temperature furnace constant, and then slowly reducing the temperature of the high-temperature furnace to reach the constant temperature so as to obtain the mesopore-micropore composite porous carbon. The method is simple, a synthetic carbon precursor structure effectively corresponds to a porous carbon material structure, and the mesopore-micropore composite porous carbon has a mesopore-micropore aperture structure with narrow aperture distribution, and has a good application prospect in fields such as electrodes of super-capacitors, gas adsorption and industrial catalysis.

The present invention provides a vinyl chloride polymer composition which comprises (i) a vinyl chloride polymer (a) and (ii) a block copolymer (b) having a polymer block (I) comprising of a block copolymer, which may be hydrogenated, of an aromatic vinyl compound polymer block and a conjugated diene polymer block, and a polymer block (II) of a polyurethane, in a specific weight ratio. The vinyl chloride polymer composition of the present invention has non-tackiness, excellent handling properties, favorable flexibility and mechanical properties, and favorable melt-adhesiveness to other materials, and shows no migration of the component serving as a plasticizer. The vinyl chloride polymer composition of the present invention can be applied for various uses such as a production of various molded articles and a production of a laminated structure with other materials.

The disclosed technology relates to a novel coupled 6-amino uracil derivative, and the use of the coupled 6-amino uracil derivative as a stabilizer in halogen containing polymer compounds. In particular, the disclosed technology relates to the use of a coupled 6-amino uracil derivative as a stabilizer in vinyl chloride compounds, such as, for example, chlorinated polyvinyl chloride (CPVC) compounds.

The present invention relates to a vinyl chloride polymer and a method for preparing same and, more specifically, to a vinyl chloride polymer of which the polydispersity index is 2.0 to 2.3 and the porosity is 60% or higher, and a method for preparing the vinyl chloride polymer. More particularly, in the method for preparing the vinyl chloride polymer, a vinyl chloride polymerization seed having aconversion rate of 5 to 20% is first prepared by means of prepolymerization, and then a vinyl chloride monomer is input to the vinyl chloride polymerization seed and a vinyl chloride polymer is polymerized (main polymerization), wherein the temperature differential between the prepolymerization and the main polymerization is adjusted to 5 to 15 DEG C. The preparation method has the advantage of increasing polymerization productivity. The vinyl chloride polymer polymerized by means of the preparation method shows said physical properties and thus has the advantages of enhancing the fish eye quality and initial coloration as well as enabling excellent processability.

The invention discloses a material balance intelligent control method for post-treatment of polyvinyl chloride polymer. The material balance intelligent control method comprises the following steps: S1, calculating the feeding amount of a stripping tower on line; s2, adjusting and balancing the feeding amount of the stripping tower while the step S1 is carried out; and gradually iteratively adjusting the temperature and the feeding flow in the stripping tower according to a set flow adjustment target value by adopting a hill climbing algorithm. The online calculation of the feeding amount of the stripping tower is a fundamental way for solving automatic balance; meanwhile, in the flow adjusting process, the temperature and the feeding flow in the tower are gradually and iteratively adjusted according to a set flow adjusting target value by adopting a hill climbing algorithm similar to the nature, so that the effect of removing the residual vinyl chloride is ensured, and the material balance of polymerization kettle-polymer post-treatment in polyvinyl chloride resin production and the automatic control of the operation of the stripping tower are realized; the working condition is stable, collision-free switching is achieved, operation is safe, and material balance and process indexes are ensured.

The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method, a modifier is introduced at the end of a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the generation of dehydrochlorination due to heat or ultraviolet rays may be markedly restrained, thermal stability may be improved, and discoloration or the modification of physical properties may be prevented in the vinyl chloride polymer thus prepared.

The disclosed technology relates to hollow fiber membranes prepared from a coating solution comprising a vinyl chloride polymer (e.g., chlorinated polyvinyl chloride) and a thermoplastic polyurethane.

The invention relates to a film made of a vinyl chloride polymer mixture that, in addition to the conventional additives, contains 0.1 to less than 5 wt % of a semicrystalline or amorphous polyester, has a good thermal formability, and is suitable for the packaging of bulk goods. The film is produced by extruding or by calendering the plastified vinyl chloride polymer mixture, optionally followed by inline/offline stretching and, optionally, thermally formed immediately thereafter.

The present disclosure is directed to a thermoplastic polymer for additive manufacturing, wherein the thermoplastic polymer is derived from a chlorinated monomer unit, wherein the thermoplastic polymer has a melt flow rate (MFR) suitable for additive manufacturing. The present disclosure is also directed to a method of making a 3D product formed by additive manufacturing, wherein the 3D product comprises a thermoplastic polymer derived from a chlorinated monomer unit or a thermoplastic composition comprising at least one thermoplastic polymer derived from a chlorinated monomer unit; and at least one stabiliser, wherein the thermoplastic polymer or composition has a MFR suitable for additive manufacturing.

The invention relates to the technical field of plastics, in particular to a high-temperature-resistant plastic piece and a preparation method thereof, wherein the high-temperature-resistant plastic piece is prepared from the following components in parts by mass: 5-8 parts of mica, 4-6 parts of a silane coupling agent, 2-5 parts of an antioxidant, 1-4 parts of a plasticizer, 15-30 parts of a low-density polyethylene resin, 40-45 parts of a high-density polyethylene resin, 8-15 parts of a vinyl chloride polymer and 8-10 parts of an amino-terminated polymer A. The high-temperature-resistant plastic disclosed by the invention is reasonable in formula design, can effectively improve the stability of the plastic at high temperature, avoids the conditions of softening, bending, deformation and the like, and improves the use performance.