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82results about How to "Improve storage stability" patented technology

Starch-based graft copolymer coal water slurry dispersant and preparation method thereof

The invention provides a starch-based graft copolymer coal water slurry dispersant and a preparation method thereof. The method comprises steps that: a 10% to 20% starch aqueous suspension is heated; an oxidizing agent which takes 0.1% to 5% of the mass of starch is added to the aqueous suspension of starch for carrying out an oxidization reaction for 10 to 60min; the mixture is heated to a temperature of 80 to 95 DEG C, and the mixture is gelatinized for 20 to 60min while maintaining the temperature; the temperature of the mixture is reduced to 40 to 70 DEG C, and meanwhile mixed monomer and an initiator are dropped into the mixture; the mixture is heated to a temperature of 80 to 95 DEG C, and is subject to a reaction while maintaining the temperature for 20 to 120min; the temperature is reduced to 20 to 40 DEG C, and the pH value of the mixture is regulated to 7-9 by using a sodium hydroxide solution. The dispersant is a viscous emulsion with a color of light yellow to off-white, a solid content of 25 to 35%, a pH value of 7 to 9, and a viscosity of 30 to 150mPa.s. According to the invention, strong dispersibility of styrene and carboxylic salt is fully utilized. Hydrogen bonding effect of polyhydroxy on starch straight chains upon hydrones is adopted, such that the storage stability of the coal water slurry is improved, the dispersibility of the coal water slurry is good, and the stationary phase of the coal water slurry is long-lasting.
Owner:SHAANXI UNIV OF SCI & TECH

Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof

The invention relates to a silicone caulking material for concrete expansion joints of ballastless tracks and a preparation method thereof. The caulking material is composed of the following raw materials in parts by mass: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10-35 parts of a plasticizer, 70-120 parts of filler, 0.5-10 parts of a thixotropic agent, 6-12 parts of a crosslinking agent, 1-8 parts of a chain extender, 0.3-3 parts of an adhesion promoter, 0.1-2 parts of a catalyst, 0.005-0.5 part of a pigment, 0.5-5 parts of a storage stabilizer, and 1-3 parts of a deep curing agent. The silicone caulking material is prepared by using the preparation method disclosed by the invention. The silicone caulking material has the characteristics of good construction performance, high displacement capacity, good interface adhesion, excellent aging resistance, long storage life, good deep-layer curing performance, and the like, is suitable for being applied to concrete expansion joints of ballastless tracks of high-speed rails, expansion joints of airport pavements and cement concrete pavements, and the like, and also can be applied to the failure repair of existing expansion caulking materials.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2

Emulsion carbon fiber sizing agent as well as preparation method and application of sizing agent

ActiveCN102828416AEnhanced storage and usage stabilityImprove storage stabilityFibre treatmentInterlaminar shearFiber size
The invention discloses an emulsion carbon fiber sizing agent and a preparation method and application of the sizing agent. The sizing agent comprises the following components by weight percent: 2-50% of epoxy resins, 35-97% of water, 0.5-15% of surfactants and 0.1-2.0% of inorganic ammonium salt. The emulsion carbon fiber sizing agent contains the stabilizing agent inorganic ammonium salt, so the storage stability of the sizing agent is greatly improved compared with the existing sizing agents; the emulsion can still maintain the stable property and layering and uneven concentration distribution can be avoided after the sizing agent is stored for more than three years under normal temperature; after the carbon fiber sized with the sizing agent has been stored for five years under normal temperature, the mass percentage of the sizing agent on the surface of the carbon fiber is not changed; when the sizing agent is used, stirring can be carried out at 200r/min to convey and dilute the sizing agent so that the sizing agent can not generate layering and demulsification; the interlaminar shear strength of carbon fiber composites made of the carbon fibers sized with the sizing agent is enhanced by more than 10% compared with the existing carbon fiber composites; and the mechanical properties of the carbon fiber composites are not obviously changed after the carbon fiber composites are stored for two years under normal temperature.
Owner:KINGFA SCI & TECH CO LTD +1

Unsaturated polyester resin with high cohesive force and high wettability and preparation method for unsaturated polyester resin

The invention discloses an unsaturated polyester resin with high cohesive force and high wettability and a preparation method for the unsaturated polyester resin, and belongs to the technical field of unsaturated polyester resins. The unsaturated polyester resin with high cohesive force and high wettability comprises the following components in percentage by weight: 28 to 33 percent of dibasic alcohol, 30 to 40 percent of dibasic acid or acid anhydride, 30 to 35 percent of diluent and 2 to 4 percent of glycerol. The unsaturated polyester resin obtained by the process according to the formula has high wettability and cohesive force, and has a good and quick effect of wetting glass fiber; and the cohesive force is subject to pressure and shear force tests, is increased by over 30 percent compared with an ordinary o-phthalate resin, and is over 20MPa. When quartz stone boards are produced, the average using amount of the resin of each board can be reduced from 25KG to 23KG; and the caking is difficult in the stirring process of the resin and quartz sand, so that the spreading and pressing are easier during production of manufacturers, the phenomena of deformation, cracking and the like which appear in the convention manufacturers can also be further improved, and the thixotropic property of the resin and gaseous silicon can be greatly improved additionally.
Owner:浙江天和树脂有限公司 +1

Preparation method for acrylic acid modified polyurethane water dispersion

InactiveCN101343341AImprove storage stabilityImprove poor hydrolytic stabilityCoatingsEmulsionDouble bond
The invention discloses a preparation method for acrylic acid modified polyurethane waterborne dispersion, which comprises three steps, namely polyesterglycol synthesis, polyurethane dispersion synthesis and acrylic acid modified polyurethane waterborne dispersion synthesis. In the preparation method of the invention, polyesterglycol is synthesized by adopting neopentylene glycol and isophthalic acid with the better hydrolytic stability, thus the storage stability of polyesterglycol is improved. A given mass of conjugated double bond is introduced in the trunk chain, the conjugated double bond can be copolymerized with acrylic monomers, thereby graft copolymer is formed. Because the product is the graft copolymer of polyurethane and acrylic acid, advantages of the two substances can be fully exerted, thus disadvantages of poor stability, poor water resistance and weatherability of single group modified water-based polyurethane hydrolization and poor adhesive force of acrylic acid emulsion, and the like, are ameliorated. By utilizing water as a dispersion medium in the acrylic acid modified polyurethane dispersion used for woodenware priming paint prepared through the invention, the capability of environment protecting without pollution is provided, therefore, the acrylic acid modified polyurethane waterborne dispersion is suitable for indoor decorating utilization, and has the advantages of being harmless and secure to human body.
Owner:WUXI HUHUANG PAINT

Polyurethane microcapsule dispersing agent preparation method and product thereof

The invention provides a polyurethane microcapsule dispersing agent preparation method and a product thereof. The preparation method comprises the following steps that excessive polyisocyanate and hydrophilic surfactant with a hydroxyl group is subjected to tetramethylethylenediamine catalytic reaction for 2-4 h at the temperature of 65-90 DEG C, and a polyurethane prepolymer is generated; the temperature of polyurethane prepolymer is lowered to be 25-40 DEG C, the polyurethane prepolymer is stirred and mixed with core materials to be uniform, and an oil phase is formed; the oil phase is added into a polyvinyl alcohol aqueous solution, homogeneous emulsification is conducted, and an O/W type emulsion is prepared; at the temperature ranging from 40 DEG C to 60 DEG C, a polyamine aqueous solution is slowly and dropwise added into the O/W type emulsion, after dripping is completed, heat preservation and curing are conducted for 1-2 h, and a polyurethane microcapsule dispersing agent is obtained. The polyurethane microcapsule dispersing agent has the excellent storage stability, dilution stability, centrifugal stability and acid and alkali resistant stability, harmful ingredients such as APEO, formaldehyde and aniline are not contained, and environmental protection is achieved; the polyurethane microcapsule dispersing agent preparation method and the product thereof have a wide application prospect and potential market value.
Owner:TAICANG BAONI IND CO LTD

Method for coating thermal expansion hollow microspheres with energy-containing additive

The invention relates to an energy-containing sensitizing agent and in particular relates to thermal expansion hollow microspheres with an energy-containing additive and a production method thereof. The energy-containing sensitizing agent is prepared from the following components: 1 to 10 parts of expanding agent, 60 to 95 parts of energy-containing additive and 10 to 30 parts of polymer monomer.The production method comprises the following steps: firstly, adding the expanding gent and the energy-containing additive into a ball grinding mill according to a certain ratio and mixing to form scattered expanding agent particle coating on the outer surface of the energy-containing additive; finally, adding an oil-soluble initiator into the polymer monomer and carrying out body pre-polymerization at certain temperature to obtain a cross-linked pre-polymer with proper viscosity; adding the coated energy-containing additive into the cross-linked pre-polymer; after uniformly mixing, dispersing, suspending and polymerizing in a water phase; then raising the temperature and curing to obtain compound type energy-containing microspheres; finally, carrying out heating, foaming and expansion andcooling treatment to obtain the energy-containing additive coated with the hollow microspheres.
Owner:ANHUI UNIV OF SCI & TECH

Rubber asphalt and preparation method thereof

The invention relates to rubber asphalt. The rubber asphalt is compounded from the following ingredients: base asphalt, waste rubber powder, an activating and recycling agent and a fixing and anti-aging agent. Accounted by total weight of the rubber asphalt, per 100% of the rubber asphalt comprises the ingredients in the following percentage: 70-89.4% of the base asphalt, 10-29.4% of the waste rubber powder, 0.1-1% of the activating and recycling agent and 0.5-1.5% of the fixing and anti-aging agent. A preparation method of the rubber asphalt comprises the following steps: heating the base asphalt to 120-160 DEG C; slowly adding the waste rubber powder and the activating and recycling agent into the heated base asphalt according to a certain proportion in a reaction kettle while stirring, wherein stirring speed is 300-1500 round/minute and stirring time is 5-20 minutes; raising temperature of the mixture to 170-180 DEG C, and performing high-speed shearing on the heated mixture by a shearing machine or a colloid mill for 5-30 minutes, wherein the shearing speed is 3000-5000 round/minute; and adding the fixing and anti-aging agent into the mixture and reacting the mixture while stirring for 2-5 hours. Compatibilities of the rubber powder and the asphalt are improved by the preparation method, so that the problem of instabilities of rubber asphalts in high-temperature storage is solved.
Owner:PETROCHINA CO LTD

Sulfur-containing glycidyl ether epoxy resin and preparation method thereof

The invention relates to the technical field of preparation of epoxy resin and particularly relates to sulfur-containing glycidyl ether epoxy resin and preparation method thereof. The preparation method comprises the steps of carrying out ultraviolet irradiation reaction on a sulfydryl compound and (2-methyl)allyl glycidyl ether in the presence of a photoinitiator and an organic solvent for 2-10 minutes, so as to obtain the sulfur-containing glycidyl ether epoxy resin. According to the preparation method, the epoxy resin can be synthesized from monofunctional, bifunctional and multifunctional sulfydryl compounds through one-step irradiation reaction, the reaction efficiency is high, the reaction time is short, and the yield reaches above 98%; the prepared sulfur-containing epoxy resin does not contain hydroxy, has relatively low viscosity and relatively high storage stability, is expected to be applied to the fields of environment-friendly low-volatility coatings, low-volatility resin, solvent-free epoxy resin insulating paints and the like and can be directly applied without being added with an organic solvent or an active diluent. Besides, the preparation method is simple, low in cost and easy for industrial production, and the pollution of waste water and water gas is avoided.
Owner:WUHAN HYPERBRANCHED POLYMER RESINS SCI& TECH CO LTD

Low-temperature high-efficiency crude oil pour point depressant

PendingCN109897620AAlleviate condensation and sedimentationImprove storage stabilityDrilling compositionIon exchangeIon
The invention relates to a low-temperature high-efficiency crude oil pour point depressant, and belongs to the field of petroleum industry. Sepiolite is subjected to secondary roasting after drying, an ion diffusion channel in the sepiolite is widened, in combination with ion exchange and charge effects, the sepiolite is retarded and prevented from settling, the storage stability is improved, acrylic acid and maleic anhydride are used as raw materials, an dispersion effect is improved through steric hindrance and charge effects, and agglomeration and coagulation of heavy components in crude oil are slowed down; and chitosan, stearic acid, sodium bentonite and the like are used as raw materials, larger steric hindrance is generated, stable dispersion performance is provided, phospholipid isadded when a paraffin treating material is prepared, a single phospholipid molecule has more negative charges and can be adsorbed and wrapped on the surface of colloid, microgels have the same charges and repel each other, so that the pour point depression effect is improved, agglutination deposition of components of the crude oil is slowed down, and the storage stability of the crude oil is further improved. The problems of poor viscosity reduction effect and poor storage stability of the conventional pour point depressant at a low temperature are solved.
Owner:广州市天河区车陂亚贝思烘焙店

Environment-friendly air filtration non-woven fabric as well as production process and application thereof

The invention provides a production process of an environment-friendly air filtration non-woven fabric, and belongs to the technical field of air filtration. Polypropylene, electret master batch and high-molecular electret are uniformly mixed, the prepared mixture is fed into a screw extruder, melt extrusion is performed through the screw extruder to form a melt, the melt is sprayed out through a spinneret plate to form fibers, the fibers are subjected to constant-temperature and constant-pressure hot air drafting, melt-blown cloth is formed on a web curtain, then infrared radiation heat treatment, high-pressure electret treatment and cooling treatment are sequentially conducted, then rolling is conducted, and the air filtration non-woven fabric is obtained, wherein electret master batches are composed of polypropylene, few-layer graphene nanosheets, an antioxidant, a compatilizer and a nucleating agent; the few-layer graphene nanosheet is prepared by taking magnesium oxide microcrystals with a face-centered cubic structure as a substrate and a template through a chemical vapor deposition method; and the electret master batch improves the electret degree of fibers, improves the storage stability of charges and further improves the filtering performance.
Owner:DONGGUAN CHUNXIA IND CO LTD
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