22 results about "Chain scission" patented technology

This invention provides a high-MFR polymer with balanced elasticity and strength, which is compatible with other polymer systems. [Solution] A bisbroken hydrogenated styrene-based block copolymer (m-HSBC) is provided. The m-HSBC comprises at least one vinyl-aromatic block "S" and at least one rubbery block "R" derived from a hydrogenated diene unit. It is produced by controlled chain scission of an HSBC precursor. The chain scission process forms low molecular weight species and increases the melt flow rate (MFR). The m-HSBC has a GPC main peak molecular weight (M) of 10-200 kg / mol. p ), has a maximum residual unsaturation (RU) of 0.5 meq / g, and a melt flow rate (MFR) of 10 to 2000 g / 10 min at 190°C / 2.16 kg. m-HSBC may be functionalized with anhydrous, epoxy, silane, or (meth)acrylate groups.

The invention discloses a polymer hydrogenation method, a catalyst and a preparation method of the catalyst. The hydrogenation method of the polymer comprises the following steps: carrying out hydrogenation reaction on the polymer and hydrogen under the action of a catalyst, the catalyst comprises Ni and a first non-metallic element; and the catalyst particles have nano-particle sizes. In the polymer hydrogenation method, the catalyst is high in activity, long in service life and low in polymer chain scission rate.

The application relates to the technical field of layered products, and discloses a high-elasticity weather-resistant composite waterproof roll material and a preparation method thereof. The roll material is a layered product, and sequentially comprises an upper reinforcing layer, a core layer and a lower reinforcing layer from top to bottom. The core layer is prepared from a bio-based polyurethane prepolymer prepared by reacting a microbial fermentation source long-chain polyester diol with an aliphatic diisocyanate, and is formed by thermal curing in cooperation with a chain extender, a catalyst and inorganic fillers. The long-chain polyester diol is obtained by polycondensation of a hydroxyl fatty acid monomer with a carbon chain length of ten to eighteen, and does not contain a double bond structure in the molecular chain. The application eliminates weak sites of photo-oxidative chain scission in the chain segment from the root of the molecular structure, blocks a chain scission path caused by ultraviolet rays, and maintains the elastic structure integrity of the roll material under long-term illumination.

A purpose of the present invention is to provide a positive-type resist composition that is capable of forming a highly distinct resist pattern at high sensitivity. The positive-type resist composition of the present invention includes a polymer A and a compound B. The polymer A is a main-chain scission polymer, the compound B is represented by formula (I), and when the content of the polymer A is WA and the content of the compound B is WB, the relationship WA ≥ WB is satisfied. Note that in formula (I), two or more of R1 to R3 may be bonded to form a ring structure which may have a substituent, and those of R1 to R3 that do not form a ring structure are each independently a hydrogen atom, a halogen atom, or an organic group, and may be the same or different.

The application discloses a kind of inhibiting main chain excessive cracking's regenerated rubber preparation process, belongs to waste rubber regeneration technical field.The process whole process normal pressure operation, 22 mesh-26 mesh vulcanized rubber powder, conventional softener, zinc soap type activator are mixed according to proportion, through high-speed stirring self-friction temperature to 154 DEG C-155 DEG C, at 90 DEG C, 148 DEG C twice fixed point adding special auxiliary, feeding ratio is 4:6-6:4, frequency conversion control speed reaction 10-13min, selective rupture sulfur-carbon bond and inhibit excessive cracking of rubber main chain.Subsequently at 120 DEG C-130 DEG C low-speed constant-temperature reaction is completed structure reorganization, after cooling, tail gas environmental protection treatment obtains finished product.The application uses conventional raw material to replace high-price environmental protection raw material, process low energy consumption, low pollution, and the prepared regenerated rubber rubber hydrocarbon content is high, and physical performance and environmental protection index are significantly better than traditional process.

The invention belongs to the technical field of plastic recovery, and particularly relates to a waste plastic recovery treatment method which comprises the following steps: S1, pretreatment: sorting, crushing and cleaning waste plastics; s2, low-temperature critical extraction: feeding the pretreated plastic into a high-pressure reaction kettle, injecting an extraction solvent into the high-pressure reaction kettle, extracting under the conditions that the temperature is 50-100 DEG C lower than the melting point of the plastic and the pressure is higher than the critical pressure of the extraction solvent, and separating to remove additives and small molecular impurities; s3, in-situ reconstruction: after extraction, adding a reconstruction agent into the high-pressure reaction kettle, and carrying out a molecular chain repair reaction in a supercritical fluid atmosphere; and S4, the reconstructed plastic melt is extruded and granulated. Extraction is carried out at the temperature lower than the melting point of plastic by 50-100 DEG C, a plastic polymer main body is kept in a solid state and is not molten, a thermal oxygen chain scission reaction is avoided, and a molecular chain structure is reserved; and reconnection and growth of the molecular chain are realized through reconstruction.

A recycling composition comprising a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream, wherein the low molecular weight polyolefin has a number average molecular weight (Mn) of less than 10,000 g / mol. A method comprising contacting a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream with a chain scission agent to form a reacted mixture; and conducting advanced recycling with the reacted mixture wherein the low molecular weight polyolefin has number average molecular weight (Mn) of less than 10,000 g / mol.

The present application relates to a kind of acetylene yield improvement pyrolysis method and system.The present application can set different reaction temperatures according to the needs in different reaction zones by designing segmented reaction zone;With methane or methane-rich mixed gas as carrier gas, it not only shortens the reaction time, but also can promote the cracking of methane, and the reaction product hydrogen of methane cracking is the activation component of high-temperature cracking of cracking raw material, which can promote the chain scission of cracking raw material to generate acetylene and improve the acetylene yield.

The invention provides a soluble component molecular weight change-based polymer material chain scission degree evaluation method, which comprises the following steps: extracting an original sample and an aged polymer material sample to obtain a soluble component; performing a gel permeation chromatography test on the soluble component to obtain a molecular weight distribution curve; calculating an effective chain number index A based on the molecular weight distribution curve; and calculating the chain fracture degree based on the effective chain number index A, and evaluating the aging degree. According to the method provided by the invention, the influence of a cross-linked network is eliminated by focusing on soluble low-molecular-weight substances which are extracted by a solvent and are generated due to chain fracture, so that the detection result can more objectively reflect the degree of chain fracture. On the basis, a GPC technology is combined to provide a chain fracture degree algorithm, so that quantitative calculation of the chain fracture degree is realized, and the method is further used for evaluating the aging degree.

The present invention relates to a composite that promotes polymer degradation by inducing radical generation and photothermal reactions. The composite has a core-shell structure and comprises: a core that generates radicals in response to ultrasound; and a photothermal conversion carrier shell that induces heat generation upon near-infrared irradiation. The present composite may be applied to a polymer structure inserted into a living body to precisely induce polymer chain scission and degradation according to external stimuli. Through this, the biodegradation rate may be accelerated and in vivo safety may be ensured.

The application discloses a recyclable blow molding grade thermoplastic polyester elastomer and a preparation method thereof, which is prepared from the following components according to weight parts: thermoplastic polyester elastomer 92-99 parts, isocyanate chain extender 1-3 parts, difunctional epoxy resin 0.8-2.4 parts, and antioxidant 0.1-0.8%. In the blow molding process, the chain extender dimer and the epoxy group become the source of chain extension slow release, part of the dimer decomposes into monomers, and the monomers are chain-extended again, and meanwhile the remaining epoxy groups also participate in chain extension. The loss of chain scission degradation at high temperature is made up, the melt index and other performance changes are still small, and 100% secondary material is independently used. Through 5 times of double screw extrusion test, the melt index of the thermoplastic polyester elastomer changes very little, which provides reliable guarantee for the separate multiple recycling of the blow molding grade thermoplastic polyester elastomer in the factory.

The invention relates to the technical field of PVC (polyvinyl chloride) gloves, in particular to a flexible and comfortable PVC synthetic glove and a preparation process thereof. The flexible and comfortable PVC synthetic gloves are prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride paste resin, 30-50 parts of dioctyl terephthalate, 20-30 parts of a vegetable oil-based plasticizer, 5-10 parts of tributyl citrate, 1-5 parts of a first elastomer, 3-7 parts of a second elastomer, 0.5-1.5 parts of a calcium-zinc stabilizer, 10-40 parts of a viscosity reducer and 0.2-1 part of a release agent. By optimizing the formula and dosage of the plasticizer and introducing the synthetic rubber subjected to chain scission treatment and nitrile rubber combined modified PVC system, the stability of the system is ensured, various gram weight production requirements are met, and the strength, rebound resilience, softness and other properties of the glove are greatly improved.

The invention belongs to the technical field of waste plastic chemical recovery and resource utilization, and particularly relates to a method for preparing fuel oil by adopting a waste chlorine-containing high polymer material. Comprising the following steps: S1, pretreating the waste chlorine-containing high polymer material and polystyrene; s2, adding a catalyst and uniformly mixing; s3, carrying out synergistic dechlorination and chain scission degradation reaction under the action of a catalyst; and S4, after the reaction is finished, cooling and separating the reaction system. According to the method, a waste chlorine-containing mixed plastic and rubber system which is complex in component and difficult to sort can be treated, and synergistic dechlorination and degradation conversion are achieved; compared with a traditional high-temperature pyrolysis route, conversion can be achieved at the low temperature or in an ultrasonic / mechanochemical mode, and reduction of energy consumption and side reactions is facilitated; through dechlorination and conversion, adverse effects of chlorine-containing components on equipment corrosion and product quality can be reduced, and the method has good engineering application potential.

This invention discloses a branched multi-arm polymer, its preparation method, and its applications. The branched multi-arm polymer contains a core group and at least three arm-like branches connected to the core group; wherein the core group is derived from a water-soluble small molecule compound containing at least three functional groups, selected from -NH2, -OH, -SH, and -COOH; the arm-like branches are polymer molecular chain segments containing an alkenyl backbone structures, derived from two or more of anionic monomers, cationic monomers, and nonionic monomers. The branched multi-arm polymer of this invention has a highly branched structure, which can weaken or eliminate the effect of high-temperature chain scission in chain polymer filtration reducers, and it also has excellent salt and calcium resistance, making it suitable as a filtration reducer for emulsion-type drilling fluids.

The invention discloses wastewater advanced treatment equipment with a wastewater recycling function, and belongs to the field of environmental protection and wastewater multi-stage treatment.The wastewater advanced treatment equipment comprises a shell and a liquid inlet part arranged on one side of the shell, and a pulsed electric field reaction treatment part, an electrolytic oxidation part and a magnetic flocculation separation part are arranged in the shell; the pulsed electric field reaction treatment part comprises a treatment cavity I formed in the shell and communicated with the liquid inlet part, a hollow ring body fixedly connected to the inner wall of the treatment cavity I, and a cathode I fixedly connected to the inner wall of the hollow ring body; a pulsed electric field can be formed in the treatment cavity I through an anode in the center of the treatment cavity I and a cathode I on the inner wall of the treatment cavity I, and macromolecular organic matters in the wastewater are subjected to electron bombardment, electrostriction and electroporation effects under the action of the high-intensity electric field; chemical bonds are selectively broken, so that ring opening and chain scission are realized, and the compound is converted into small and medium molecular fragments which are easier to be oxidized subsequently; efficient physical sterilization is realized, and biotoxicity is eliminated.

An end capped condensation polymer may be formed by heating a condensation polymer in the presence of an end capping compound to form cleaved condensation polymer reacting at least a portion of the cleaved condensation polymer with the end capping compound to form the end capped condensation polymer. The end capped condensation polymers may be used to form additive manufactured articles having high solids loading and improved processing due to improved rheological behavior.

The invention belongs to the technical field of plastic waste treatment, and particularly relates to a degradation method of polyethylene glycol terephthalate. The degradation method of polyethylene glycol terephthalate provided by the invention comprises the following steps: mixing polyethylene glycol terephthalate and a catalyst, and carrying out ball milling to obtain terephthalic acid and ethylene glycol; the catalyst includes a polyoxometallate. According to the invention, the catalyst can directionally attack ester groups in polyethylene glycol terephthalate in a nucleophilic manner under mechanical force activation of a ball mill, so that the ester groups are subjected to chain fracture, and the polyethylene glycol terephthalate is degraded into terephthalic acid and ethylene glycol. The degradation method provided by the invention does not need harsh reaction conditions such as high temperature, high pressure and an organic solvent, and has remarkable economical efficiency, high efficiency and environment friendliness, and a product obtained by degradation has very high selectivity.

This invention relates to the field of organosilicon surfactant technology, and more particularly to an acid and alkali resistant organosilicon surfactant and its preparation method. The acid and alkali resistant organosilicon surfactant comprises a hydrophilic portion and a hydrophobic portion. The hydrophilic portion is provided by polyether, and the hydrophobic portion is provided by an MDT' or MDD'T structured polysiloxane. The beneficial effects of this invention are: ① Increased Si-CH3 density, resulting in increased interfacial enrichment density and reduced water-induced chain scission attack on Si-O-Si; ② Excellent acid and alkali resistance; a 0.1% aqueous solution at pH=3 and pH=12 can withstand heat storage at 54℃ for 2 months; ③ Raw materials are readily available, and commercially available products already exist; ④ Simple process, easy to industrialize; ⑤ Non-ionic surfactant with strong compatibility and wide applicability.

The invention provides application of sulfur and alkyl mercaptan as a composite regulator in preparation of chloroprene rubber from chloroprene monomers. The alkyl mercaptan comprises n-dodecyl mercaptan and / or tert-dodecyl mercaptan; the mass ratio of the sulfur to the alkyl mercaptan is (3-5): 1. The invention also provides a sulfur-mercaptan synergistic regulation mixed regulation type chloroprene rubber synthesis process without chain scission. According to the designed composite regulator system, improvement of processability by sulfur is reserved, branching is inhibited through thiol, PDI is controlled, a chain scission process is not needed, the Mooney viscosity fluctuation of the product prepared from the mixed regulation type CR is smaller than or equal to 5ML (1 + 4) 100 DEG C according to the proportion, and sudden reduction of viscosity is effectively avoided. According to the synthesis method provided by the invention, Mooney viscosity controllability, molecular weight uniformity and stability are considered, and the mixed regulating chloroprene rubber with narrow molecular weight distribution, controllable chain scission and long storage period is obtained.