164 results about "Heat stabilization" patented technology

System, including methods, apparatus, compositions, and kits, for making and using compound droplets of a multiple emulsion to supply an amplification reagent, such as a heat-stable DNA polymerase or DNA ligase, to an aqueous phase in which the compound droplets are disposed. The compound droplets may be induced to supply the amplification reagent by heating the multiple emulsion, to achieve hot-start amplification.

The invention relates to a biodegradable polylactic acid material for 3D printing and a preparation method and an application thereof. The material provided by the invention contains, by weight, 50-90 parts of polylactic acid, 10-50 parts of aliphatic polycarbonate, 0.01-1 part of organic peroxide, 0.05-1 part of a cross-linking agent, 1-50 parts of a reinforcing agent, 0.3-5 parts of a compatilizer, 0.1-5 parts of a heat stabilizer and 0.1-1 part of an antioxidant. The biodegradable polylactic acid material provided by the invention can be used in a 3D printing technology. The material meets operating requirements of 3D printing, has various excellent properties of plastic, can remain good transparency, has high impact strength, can provide high toughness and thermal deformation strength, has good thermal stability and processing stability, and has low cost.

The invention discloses a PVC heat stabilizer of metal carboxylate of pentaerythritol ester and a preparation method thereof. The heat stabilizer has the following structure: M is Ca2+, Mg2+ or Zn2+, n is equal to 3-8, and R1 and R2 are -CH2C(CH2OH)2CH2OCH2C(CH2OH)3 or -CH2C(CH2OH)3; the heat stabilizer is formed as follows: salt forming reaction is carried out on one carboxylic acid group of dicarboxylic acid and oxides or hydroxides of zinc, calcium and magnesium, and esterification reaction is carried out on the other carboxylic acid group of the dicarboxylic acid and pentaerythritol or dipentaerythritol. The heat stabilizer is solid which can be melted, is white powder after being grinded, and has excellent heat stabilization for PVC.

The invention relates to a solar energy comprehensive utilization system, comprising a temperature difference heat power-generating device, and a heat radiation device which is contacted with the cold end of the temperature difference heat power-generating device of a semiconductor; the system further comprises a heat stabilization device, the heat stabilization device comprises a heat source and more than one heat storage core, and the heat storage core is contacted with the hot end of the temperature difference heat power-generating device. The solar energy comprehensive utilization system has the characteristics of high energy utilization efficiency, convenient installation and low energy utilization cost, in most cases, heat supplying and power generation can be carried out synchronously, and any mechanical power is not needed, so as to obtain cheap electricity. The size of the solar energy comprehensive utilization system is flexible and the solar energy comprehensive utilization system can be integrated with roofs of buildings through proper appearance design; in addition, the solar energy comprehensive utilization system is applied widely and can be widely applied to building, bridges, roads, deserts, grazing lands, large-scale farmlands, uninhabited islands and swimming pools and the like.

The invention discloses a heat stabilizer for processing and preparing polyvinyl alcohol granules by a dry method, a method for processing and preparing PVA granules or films by the dry method, and a product obtained by the method.

The invention relates to a composite fully-degradable material and a preparation method thereof. The composite fully-degradable material has a double-layer film structure and comprises a first layer film and a second layer film, wherein the degradation time of the first layer film is longer than the degradation time of the second layer film, the raw materials of the first layer film comprise a degradation agent, a heat stabilizer, a light stabilizer, an antioxidant, low density polyethylene and linear low density polyethylene, and the raw materials of the second layer film comprise polyadipic acid/butylene terephthalate and polylactic acid. According to the present invention, the composite fully-degradable material uses the double-layer structure, and various layers are prepared from the materials having different degradation characteristics and have different degradation rates, such that various parts can simultaneously achieve the degradation ending points during the actual use process of the prepared mulch film so as to significantly improve the practicality of degradation mulch film, reduce the influence of the residual film on the next crops, save the labor cost, and promote the development of agricultural productivity.

The invention relates to a preparation method of a polyacrylonitrile based heat stabilized fiber, and mainly solves the problem that the polyacrylonitrile heat stabilization process in the prior art affects the performance of heat stabilized fiber. Polyacrylonitrile precursors are subjected to heat treatment for not less than 40min in at least three ordinary pressure heat stabilization furnaces of oxygen-containing gas atmosphere, and the total draft is not higher than 6%. The heat treated fiber passes through at least one ordinary pressure heat stabilization furnace of inert gas atmosphere to undergo heat treatment at 240-270DEG C for not less than 5min, and the draft ranges from -2 to 0%, thus obtaining the polyacrylonitrile based heat stabilized fiber. The technical scheme well solves the problem, and can be used for the heat stabilized industrial production of polyacrylonitrile precursors.

The invention relates to a bacteriostatic PVC film, and belongs to the field of polymer materials. The bacteriostatic PVC film comprises the following raw materials: by weight, 100-120 parts of PVC resin powder, 0.1-0.5 parts of angelica essential oil, 22-28 parts of acetyl-tri-n-butyl citrate, 2-5 of a heat stabilizer, and 0.5-1 part of a lubricant. The bacteriostatic agent used in the bacteriostatic PVC film is a pure natural plant-extracted bacteriostatic agent, can inhibit breeding of bacteria around the film, to provide a healthy environment for people. At the same time, the bacteriostatic PVC film uses the acetyl-tri-n-butyl citrate as a plasticizer, health problems caused by the use of plasticizer products containing phthalate esters can be effectively avoided.

The invention provides a PVC rare-earth composite heat stabilizer and a method for making the same. The heat stabilizer is a wool acid metal rare-earth soap stabilizer and has a general chemical equation of xRE.yCa.zZn.(OOCR)n or x'RE.y'Ba.z'Zn.(OOCR)n. The method for making the heat stabilizer comprises the following steps that: sodium hydroxide is dissolved into an ethanol water solution and is stirred as well as is condensed and flowed back, the melting common and braid wool acid is added to adjust the pH value and decrease the temperature; water, chlorination rare-earth salt solution and salt are added in sequence to be pumped, filtered, washed by ethanol and water, dried and grinded into a product. The stabilizer adopts the common and braid wool acid as the raw material, thereby having wide resources, low cost, reasonable and scientific preparation method and great maneuverability; the product is straw yellow powder and has good primary and long-term heat stabilization performance of PVC and good effects in the aspects of material process and mechanical performance, is nontoxic and protects the environment, and can be applied to the processing and forming aspects of PVC water supply and drainage pipes and have evident social and economical benefits.

The invention provides an acetylacetone metal component, a precreation method for the acetylacetone metal component, a plastic and the application of heat stabilizer. The acetylacetone metal component has the following general formula: (OH)x.A<n+>y.Bz, wherein A expresses a metal ion, n expresses the valence of the metal ion, B expresses an acetylacetone anion, and a relationship among n, x, y and z is n*y=x+z. Metal hydroxide or metallic oxide reacts with salt of acetylacetonate to obtain the acetylacetone metal component. By use of the acetylacetone metal component disclosed by the invention, cost is lowered, and characteristic odors are reduced. The acetylacetone metal component is used for the plastic (especially polyvinyl chloride) as the heat stabilizer, and the heat stabilization effect of the acetylacetone metal component is equivalent to the heat stabilization effect of traditional calcium acetylacetonate.

The invention relates to a calcium-zinc stearate and adipic acid di-maltitol ester PVC stabilizer and a manufacturing method thereof, which belong to the field of heat stabilizers for polyvinyl chloride (PVC) processing. Through adding adipic acid di-maltitol ester to carry out compounding with zinc stearate, calcium stearate, beta-diketone, a lubricant and an auxiliary heat stabilizer, a high-performance calcium-zinc stearate and adipic acid di-maltitol ester PVC composite heat stabilizer is obtained. A novel heat stabilizer prepared by using the method disclosed by the invention has the characteristics of ideal initial color, good long-term heat stabilization effect, and capability of promoting the plasticizing, lowering the balance torque, and improving the processing performance. The heat stabilizer prepared by using the method disclosed by the invention has the advantages of high efficiency and environment friendliness.

The invention relates to the PVC material technology field, and concretely relates to a medical environmental protection PVC modified material and a preparation method therefor. The modified material comprises the following raw materials, by weight, 80-120 parts of PVC resin, 60-80 parts of plasticizer, 10-20 parts of filler, 3-7 parts of heat stabilizer and 0.4-0.8 part of lubricant. The modified material employs the above raw materials, the weight ratios of the raw materials are controlled strictly, various performances of the prepared modified materials exceed the national standards, and the provided modified material is advantaged by environmental protection, excellent temperature resistance and weather resistance, high intensity, excellent shock resistance, good flame retardation effect, excellent processing property and excellent comprehensive properties.

The invention discloses a compound stabilizer for polyvinyl chloride (PVC) and a preparation method thereof. The compound stabilizer for PVC is prepared from the following raw materials in parts by weight: 10-70 parts of main stabilizer and 30-90 parts of auxiliary stabilizer, wherein the main stabilizer is a compound of a maleic acid monoester, a maleic acid diester, a maleic acid monoester salt and a maleic acid compound salt. The preparation method of the compound stabilizer for PVC comprises preparation of the main stabilizer and compounding of the auxiliary stabilizer. Compared with the prior art, the compound stabilizer has the beneficial effects that a non-toxic and environment-friendly compound stabilizer for PVC with a good heat stabilization effect is provided; meanwhile, the compound stabilizer for PVC is simple and feasible in preparation method, cheap and available in raw materials, high in yield, low in cost, free of toxicity and environment-friendly. The compound stabilizer for PVC disclosed by the invention is applicable to different grades of PVC soft and hard products, and has a broad application prospect.

It is disclosed here that a protein with a heat-labile specific binding activity can be stabilized with a saccharide compound with regard to the binding activity. To heat-stabilize the protein, it is mixed with a saccharide compound in a liquid suspension and the suspension is then dried to produce a solid that contains the protein and the saccharide. The saccharide compounds that possess the protein heat-stabilization activity include monosaccharides, disaccharides, polysaccharides, alkylated monosaccharides, alkylated disaccharides, alkylated polysaccharides, monosaccharide alcohols and alkylated monosaccharide alcohols.

The invention discloses an auxiliary heat stabilizer for PVC (Polyvinyl Chloride) machining. According to the auxiliary heat stabilizer, calcium oxide and zinc oxide are added into a system which takes organic carboxylic acid as a catalyst so as to react with glycerinum, a prepared metal organic complex is just the stabilizer; the reaction comprises the following specific steps: taking calcium oxide, zinc oxide and glycerinum of equal moles, feeding calcium oxide, zinc oxide and glycerinum into an organic carboxylic acid environment, heating to 180 DEG C, reacting for 200 minutes, cooling to 120 DEG C when the reaction system is colorless and transparent, dropwise adding 6-amino-2-sulfydryl-pyrimidine-4-alcohol of which the total additive amount is equal to the mole of glycerinum at a speed of 1ml/s, then performing heat preservation for 60 minutes at 80 DEG C, filtering, drying and crushing so as to obtain the stabilizer. According to the auxiliary heat stabilizer, zinc components for improving the heat stabilization effect at the primary period in PVC machining and calcium components for inhibiting 'zinc combustion' are compounded together, so that the defect of poor stability of the stabilizer at the primary period is solved, and the auxiliary heat stabilizer can be directly used as a stabilizer independently.

The invention discloses a PBC (Poly Butylene glycol Carbonate) material for 3D (Three-dimensional) printing and a preparation method thereof. The technical scheme is as follows: 1, a formula comprises 75 to 95 percent by weight of PBS (Poly Butylene Succinate), 0.1 to 20 percent by weight of inorganic filler, 0.1 to 0.5 percent by weight of a chain extender, 0.1 to 0.5 percent by weight of a cross-linking agent, 0.1 to 2 percent by weight of a nucleating agent, 0.1 to 0.5 percent by weight of a heat stabilizer, 0.2 to 1 percent by weight of an antioxidant and 0.2 to 1 percent by weight of a lubricant; 2, the preparation method comprises the steps of (1) drying, (2) weighing, (3) high-speed kneading, (4) melt extrusion, (5) cooling drawing, and (6) rolling bundling. A high molecular material applicable to the 3D printing is prepared from an inorganic filler-modified completely-degraded biological material PBC, and has higher tensile strength and flexibility, and the class of 3D printing materials is expanded.