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35results about How to "Avoid excessive viscosity" patented technology

Polymerization process using separated flow

Disclosed is a polymerization process comprising feeding a monomer as a raw material, a polymerization catalyst, and optionally, an inert medium to a tubular reactor in a pressurized state; permitting a part of the raw material monomer and the inert medium fed to the reactor to form a gas phase and the remainder to form a liquid phase, so that both of the gas phase comprising the raw material monomer and / or the inert medium and the liquid phase comprising the raw material monomer and / or the inert medium are present in the reactor, wherein said liquid phase may contain a resulting polymer as a solid, and so that a gas-liquid separated flow or a gas-liquid-solid separated flow has the gas phase that is continuous in the direction of flow is formed in the reactor; and polymerizing the raw material monomer while carrying the liquid phase by the gas phase flow, wherein the ratio of a volume flow rate of the liquid phase to a volume flow rate of the gas phase at the outlet of the reactor is 0.00001 to 100,000. According to the polymerization process, polymerization can be accomplished with excellent thermal efficiency and small power energy, and besides various polymers almost free from restrictions on their properties such as viscosities and melting points can be produced.
Owner:MITSUI CHEM INC

A kind of biodegradable environmental protection lubricating oil

The invention discloses a preparation method of modified vegetable oil. The method comprises the following steps: 1) modifying vegetable oil with methyl hydrogen-containing silicone oil: adding methylhydrogen-containing silicone oil into a flask provided with a constant-temperature feeding funnel and a condensation pipe, replacing air in the flask with nitrogen or inert gas, opening condensate water, adding a catalyst, vegetable oil and isopropanol, stirring, heating to 80-85 DEG C, keeping the temperature for 6-7 hours, and performing reduced pressure distillation to remove low-volatility substances, thereby obtaining hydrogen-containing silicone oil modified vegetable oil; and 2) ester exchange: adding methyl hydrogen-containing silicone oil modified vegetable oil prepared in the step 1) and (2R,3S)-2,3,4-trihydroxyl-3-methylbutyl dihydrogen phosphate into an organic solvent, heating to 95-105 DEG C within 30-40 minutes under a vacuum pressure of 200 mbar; making the mixture carry out reactions for 2-3 hours under stirring at a stirring speed of 800-1000 rpm, and then carrying out rotary evaporation at 50-60 DEG C to remove low-volatility substances. The lubricating oil preparedfrom the modified vegetable oil is good in chemical stability, has an extreme pressure anti-wear effect, does not need to be added with an extreme pressure anti-wear agent additionally, is economicaland environment-friendly, and avoids the problem of overlarge viscosity caused by using a large amount of auxiliaries.
Owner:JIANGSU SHUANGJIANG ENERGY TECH CO LTD

A kind of hb(a-m) modified boron nitride nanotube reinforced PVA fiber and preparation method thereof

The invention relates to a HB(A-M) modified boron nitride nanotube reinforced PVA fiber and a preparation method thereof. The preparation method is as follows: PVA spinning solution containing HB(A-M) modified boron nitride nanotubes HB(A-M) modified boron nitride nanotubes reinforced PVA fibers were prepared by dry and wet spinning; HB(A-M) modified boron nitride nanotubes were obtained by dissolving HB(A-M) in In ionized water, add hydroxylated BNNT to it and carry out ultrasonic treatment to obtain; HB (A-M) is a hyperbranched polymer synthesized with AB as a monomer and dihydroxyethylamine as a core molecule, wherein AB is composed of mol The ratio is 1.0~1.2:1.7~2.4 aspartic acid reacts with dimethylolpropionic acid; the content of PVA in PVA spinning solution is 35~40wt%, and the viscosity of PVA spinning solution is 1500~2200Pa· s; the obtained HB(A-M) modified boron nitride nanotube reinforced PVA fiber has a fineness of 24.1-35.3 dtex, a breaking strength of 15.9-19.6 cN / dtex, and an elastic modulus of 376-389 cN / dtex. The invention effectively solves the problem of poor dispersibility of BNNT, and prepares the HB(A-M) modified boron nitride nanotube reinforced PVA fiber with excellent performance.
Owner:DONGHUA UNIV

OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and preparation method thereof

The invention relates to OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and a preparation method thereof. The preparation method comprises the following steps of carrying out dry-wet spinning on an OH-HBP-containing polyvinyl alcohol spinning solution to prepare the OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber. OH-HBP is HB(G-G) or HB(I-G); the HB(G-G) is a hyperbranched polymer synthesized by taking AB as a monomer and malic acid as a nuclear molecule, wherein the AB is formed by reacting glutamic acid and glycerin in a molar ratio of (1.0-1.2): 2; the HB(I-G) is a hyperbranched polymer synthesized by taking CD as a monomer and glycerol as a core molecule, wherein the CD is formed by reacting itaconic acid and hydroxylamine in a molar ratio of (1.0-1.2): 1; the content of polyvinyl alcohol in the polyvinyl alcohol spinning solution is 35-40 wt%, and the viscosity of the polyvinyl alcohol spinning solution is 1500-2200 Pa.s; and the fineness of the prepared high-strength coarse-denier polyvinyl alcohol fiber is 22.2 to 26.5 dtex, and the breaking strength of the prepared high-strength coarse-denier polyvinyl alcohol fiber is 14.5 to 15.6 cN/dtex. The method is simple; the problems that in the prior art, due to the fact that the viscosity of the polyvinyl alcohol spinning solution is too large, silk discharging is difficult and the spinnability is poor are effectively solved; and the prepared fiber can effectively overcome the defects that concrete is poor in crack resistance, large in brittleness and the like.
Owner:DONGHUA UNIV
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