139results about How to "Improve long-term thermal stability" patented technology

The invention relates to a kind of high mineralization oil reservoir composite oil displacement agent comprising the following components by mass: 97.5%-99.9% of highly mineralized formation brine with the salt content of 32000mg / L-360000mg / L and the Ca2 + and Mg2 + content of being greater than 1000mg / L, 0-0.5% of xanthan gum, 0.1%-1% of a negative-non ampholytic surfactant and 0%-1% of a negative-positive ampholytic surfactant, and by use of the synergistic effect among metal monovalent and divalent cations, biological polymers and amphoteric surfactant molecules, the oil displacement agent not only has higher viscosity, low interfacial tension, and long-term stability, and can meet the requirements of great improvement of recovery efficiency, technical oil displacement system wave and volume enlargement, and improvement of oil displacement efficiency of a high mineralization oil reservoir.

The present invention includes a polyolefin composition having reduced coloration with aging. The polyolefin composition comprises at least one polyolefin, an effective amount of a primary phenolic antioxidant to promote long term thermal stability of the polymer composition, and an effective amount of a phosphite processing stabilizer to promote thermal stability of the polymer composition during melt processing. The polymer composition further comprises an effective amount of a sacrificial phosphite antioxidant to reduce the yellowness index of the polymer composition. The sacrificial phosphite antioxidant and the phosphite processing stabilizer are not the same compound.

The invention relates to a preparation method of compound thermal stabilizer in plastic processing additive and pertains to the technical field of plastic processing additive. The invention discloses a ternary hydrotalcite-rare earth-Ca/Zn innoxious compound thermal stabilizer and a preparation method thereof. The invention comprises the materials of the stabilizer such as ternary hydrotalcite, organic rare earth compound, Ca compound and Zn compound, a synthetic preparation method thereof and an optimal compounding method of ternary hydrotalcite-rare earth-Ca/Zn innoxious compound thermal stabilizer. The ternary hydrotalcite-rare earth-Ca/Zn innoxious compound thermal stabilizer provided by the invention serves as a new generation high-efficiency innoxious stabilizer, can replace the traditional lead salt and expensive organic stannum thermal stabilizer and can be widely applied to the fields of PVC pipe material, section material, wire and cable, medical instrument and membrane, etc.

The invention relates to a composite heat stabilizer used in PVC, the preparation and application thereof. The composite heat stabilizer is prepared by compounding mg-al hydrotalcite and zn-al hydrotalcite according to a certain proportion. The mg-al hydrotalcite and the zn-al hydrotalcite are reasonably modified and excellently compounded by stearic acid, which can greatly save the energy consumption, increases the efficiency, and increases the thermal stability performance. In the aspect of heat stability performance, the product is non-toxic and efficient, has low cost, good initial coloration, transparency, and excellent weather resistance and plasticity, and good compatibility with PVC. The use level of an additive in the course of processing does not influence the performance of products and is difficult to wear down process equipment. The products can directly use no-toxic products to finish the substitutions of cadmium free, lead free and bromine free of export products, further is applicable to other relative industries and fields, has wide application prospect.

The radiation-selective absorber coating, in particular for an absorber tube of a parabolic trough collector, includes a reflective layer which is reflective in the infrared range, at least one barrier layer arranged below the reflective layer, at least one absorption layer arranged above the reflective layer, an antireflection layer arranged above the absorption layer and at least one adhesion-enhancing layer arranged between the barrier layer and the reflective layer. The adhesion-enhancing layer preferably is a molybdenum layer, but can also be provided by a copper, titanium, titanium oxide, or silicon layer. The adhesion-enhancing layer preferably has a thickness of 5 to 50 nm.

The present invention relates to an extruded expanded thermoplastic polyurethane elastomer bead and a preparation method therefor. The bead consists of components of the following parts by weight: 100 parts by weight of a thermoplastic polyurethane elastomer, 0.01-0.5 parts of a foaming nucleating agent, and 0.01-0.2 parts by weight of an antioxidant. The preparation method comprises: mixing materials, then putting the mixture into an extruder for granulation to produce a particle raw material suitable for foaming, finally, putting the particle into a foam extruder, and die foaming then underwater pelletizing, thus obtaining a product bead. The present invention utilizes an extrusion method to prepare expanded thermoplastic polyurethane beads. Control of the working conditions of the foaming process could lead to acquiring an expanded=bead of a controllable density, the cell density evenly distribute. The overall production process is easy to operate. Without any special limit or requirement placed on the equipment, this method is suitable for industrial continuous production.

The invention discloses a rare earth complex. The rare earth complex is an N-alkyl maleamic acid-rare earth complex having a chemical formula of RE(OA)3.nH2O, wherein RE represents a rare-earth element; OA represents N-alkyl maleamic acid radical; and n is equal to 1 or 2. The invention also discloses a preparation method of the rare earth complex and a use of the rare earth complex in a polrvinyl chloride (PVC) heat stabilizer. The rare earth complex can be prepared by simple processes, and has a low cost and industrial application prospects. The rare earth complex or a composition of the rare earth complex as a PVC heat stabilizer overcomes the defects of the existing heat stabilizers, and improves primary dyeing properties and long-term thermal stability of PVC. Especially, the rare earth complex has good synergistic effects with calcium stearate, organic tin and pentaerythritol and thus under unified use, the thermal stability of PVC is improved. In addition, the rare earth complex can effectively improve mechanical properties of a PVC material.

The invention relates to a synthesis method for hydrocalumites and a hydrocalumites based PVC complex heat stabilizer. The synthesis method comprises the following steps: performing co-precipitation reaction on the water solution of calcium salt and the water solution of aluminium salt under the existence of soluble carbonate and caustic alkali, so as to synthesize hydrocalumites, wherein the calcium salt comprises hydrated calcium chloride, the aluminium salt comprises aluminium chloride and sodium metaaluminate, the soluble carbonate comprises Na2CO3 or K2CO3, the caustic alkali comprises NaOH or KOH, and the typical structure of the hydrocalumites is Ca6Al2(OH)16CO3 . 4H2O and Ca4Al2(OH)12CO3 . 4H2O; preparing the hydrocalumites based PVC complex heat stabilizer from the hydrocalumites , calcium soaps, zinc soaps, a lubricant, a chelating agent and an antioxygen according to an appropriate proportion. Compared with the conventional PVC complex heat stabilizer, the hydrocalumites based PVC complex heat stabilizer provided by the invention has better preliminary hue and longer color-maintaining effect on the PVC and other superpolymers containing chlorine, and the long-term heat stability is excellent; besides, the PVC complex heat stabilizer has the characteristics of no toxicity, environmental protection, low cost, rich raw materials, and great convenience for manufacture and the like.

The present invention discloses one kind of epoxy-zinc soap compound as heat stabilizer for compounding polyvinyl chloride plastic. The heat stabilizer includes epoxy-zinc soap compound as main stabilizer, organic compound as co-stabilizer, and polyethylene as outer lubricant, and may also includes anionic laminated material, antioxidant, inner lubricant and other assistants. The stabilizer system may be used in compounding plasticized and unplasticized polyvinyl chloride plastic. The stabilizer is superior to available calcium-zinc stabilizer as far as the performance of polyvinyl chloride product.

The radiation-selective absorber coating for absorber tubes of parabolic trough collectors includes two or more barrier layers (24a, 24b); an infrared reflective layer (21) on the barrier layers (24a, 24b); at least one cermet absorption layer (22) above the infrared reflective layer (21) and an antireflection layer (23) above the at least one cermet absorption layer (22). The two or more barrier layers (24a, 24b) include a first barrier layer (24a) of thermally produced oxide and a second barrier layer (24b) arranged above it. The second barrier layer (24b) is a cermet material including at least one oxide compound and at least one metal. The oxide compound is aluminium oxide, silicon oxide, nickel oxide and/or chromium oxide. The metal is molybdenum, nickel, tungsten and/or vanadium. The invention also includes an absorber tube with the absorber coating on it.

The high temperature water glass blocking agent for oil production contains water glass, cross-linking agent and water, and may have surfactant contained when some cross-linking agent is used. The blocking agent has wide application temperature range of 60-280 deg.c, and has the curing time of 5-8 hr at 100 deg.c, 3-5 hr at 200 deg.c and 2-3 hr at 250 deg.c. It has high post-curing strength, pressure strength of 0.2-0.5 MPa, excellent long term heat stability, and no obvious degradation in strength after curing and set at 200 deg.c for 2 months. It may be in-situ compounded simply and single-liquid injected, and has easy to control blocking effect. The blocking agent is suitable for use in avoiding blow-by in steam flooding and steam soaking oil wall.

The invention discloses an environment-friendly transparent zinc-based heat stabilizer for PVC and a preparation process thereof, and relates to the technical field of material chemistry. The heat stabilizer comprises the following components: in parts by weight, 15-35 parts of zinc stearate, 10-32 parts of hydrotalcite, 5-15 parts of gaseous silica, 2-8 parts of 6-amino-1,3-dimethyl uracil, 5-20parts of tris(2-hydroxyethyl)isocyanurate, 2-8 parts of glyceryl monostearate, 2-8 parts of pentaerythritol monostearate, 3-15 parts of phosphite, 1-15 parts of an antioxidant, 1-15 parts of an external lubricant and 0.5-5 parts of beta-diketone, and the preparation process of the heat stabilizer comprises preparation of zinc stearate and preparation of the transparent zinc-based heat stabilizer for PVC. The environment-friendly transparent zinc-based heat stabilizer for PVC does not contain lead, cadmium, mercury and other toxic heavy metal, has good long-term thermal stability, initial discoloration can be inhibited effectively, and the technical problems of poor transparency, high toxicity and poor environmental protection of existing transparent heat stabilizers are solved fully; and the process technology is simple, and rapid industrialization and large-scale production can be realized.

The invention provides a PVC compound stabilizer. The PVC compound stabilizer is characterized by being composed of, by mass, 85-90% of a main stabilizing agent and 5-15% of a subsidiary stabilizing agent; the main stabilizing agent is composed of polyvinylpyrrolidone, bis(5-oxo-L-prolinato-N1,O2) zinc, calcium disodium ethylenediamine tetraacetate and titanium tetraisopropanolate, and the subsidiary stabilizing agent is composed of N,N-ethylene bis-stearamide, pentaerythrityl tetrastearate, epoxidized linseed oil and mannitol. The invention further discloses a preparation method of the PVC compound stabilizer. The PVC compound stabilizer has the advantages of being free of toxin, environmentally friendly, good in lubricity and the like, is high in thermal stability, high in transparency, high in impact resistance and high in profile welded corner strength, can reduce damage to PVC molecules caused by ultraviolet light, improve outdoor aging performance of a product and further has good internal and external lubricating properties, and processing can be conducted stably.

The invention relates to a method for preparing a modified liquid metal soap thermal stabilizer through potassium ion characteristic doping, belonging to the technical fields of fine chemical engineering and high molecular material application. The invention researches and develops a potassium-ion-doped PVC (polyvinyl chloride) liquid metal soap thermal stabilizer. The synthesis method of the thermal stabilizer comprises the following steps: adding composite organic acid into a three-neck flask, stirring, and heating to 90-100 DEG C; adding solid potassium hydroxide in batches; after the reaction is complete, performing reduced-pressure distillation to dewater; cooling to 80 DEG C, then adding a liquid metal soap and a solvent, and continuously stirring to react; and finally, performing reduced-pressure filtration to obtain a yellowish transparent oily liquid. By utilizing the fact that metal potassium salt has fine long-term thermal stability, produces an obviously strong inhibition effect on zinc burning and has obvious cooperativity with other metal salt, the potassium-ion-doped PVC liquid metal soap thermal stabilizer is directly prepared through a solid-liquid one-step reaction method. The thermal stabilizer has the advantages of low cost, no toxicity, environment friendliness, simple process, fine performance, light appearance color and the like, and is easy to popularize and apply.

The present invention discloses a synthetic method of PVC thermal stabilizer dyadic carboxylic acid rare-earth salt. The method is characterized in that absolute ethyl alcohol is solvent; hydrogen peroxide is reducing agent; soluble rare-earth inorganic salt, alkali and dyadic carboxylic acid are reacted according to the mol ratio of 1: 2.5-3.5:0.3-2 under the temperature of 40 to 80 DEG C so as to produce the dyadic carboxylic acid rare-earth salt. The purpose is to be used as the thermal stabilizer of PVC plastic processing. The dyadic carboxylic acid rare-earth salt as the thermal stabilizer provided by the present invention not only overcomes the settlement of the prior thermal stabilizer but also increases the preliminary tinctorial property and long-term thermal stability; in addition, the present invention also greatly promotes the PVC plastication and has low cost, therefore, the present invention has the prospect of industrial application.

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 pertains to filled polyamide compositions [composition (C)] comprising: —at least one polyhydric alcohol-modified polyamide, comprising an amount of polyhydric alcohol (PHA, herein after) residues chemically bonded at least to a part of the polyamide [polyamide (A)] of at least 0.1% wt (based on the total weight of polyamide (A)); —at least one filler [filler (F)]; and —at least one polyamide, different from polyamide (A), more than 50% moles of recurring units thereof being of formula —HN—(CH₂)₅—CO— [polyamide (PA6)], in an amount of 5 to 50% wt, based on the combined weight of polyamide (A) and polyamide (PA6).

The invention discloses a rare earth composite stabilizing agent used for PVC and a preparation method thereof. The composite stabilizing agent is compounded by a main stabilizing agent and an auxiliary stabilizing agent; the main stabilizing agent is a small molecular weight benzoic acid rare earth salt, and the auxiliary stabilizing agent is polyol and stearate; and the weight ratio of each component is as follows: 1-10 parts of the small molecular weight benzoic acid rare earth salt, 1-5 parts of the polyol, and 1-5 parts of the stearate. The problem of low initial anti-staining ability ofsingle rare earth heat stabilizer can be solved; excellent long-term stability of the rare earth heat stabilizer can be reserved; and a coordination compound of rare earth and a benzoic acid ligand has an ultraviolet absorption property. The stabilizing agent also has light stability, is low in toxicity and environmentally friendly, and accords with production requirements of current PVC industries.

Disclosed herein are composite structures having improved heat aging, processes for making them, and end use articles. The composite structures comprise a polyamide matrix resin composition comprising a matrix heat stabilizer ; a fibrous material and a polyamide surface resin composition comprising copper based heat stabilizer; wherein: the matrix heat stabilizer is different than the copper based heat stabilizer; and wherein the fibrous material is impregnated with the polyamide matrix resin composition.

The invention relates to a displacement agent for ultrahigh-temperature, high-salt, high-calcium, high-magnesium and homogeneous oil reservoirs. Without alkali, the displacement agent can make the oil and water interface tension ultralow, namely the displacement agent can obviously reduce the oil and water interface tension in the oil reservoirs, thereby reducing capillary resistance, improving oil washing efficiency and largely improving extraction rate. The invention adopts a technical scheme that comprises: adding high-salt, high-calcium, high-magnesium imitation formation water or oil field formation water into a beaker; adding a certain amount of dialkyl ether bisulfonate surfactant, namely 1,2-bis(2-sodium oxypropylene sulfonate-3- alkyl ether-propyl)glycol ether, with stirring; then adding a certain amount of polyoxy ethrlene nonyl phinyl ether or fatty alcohol-polyoxyethylene ether; and finally adding a certain amount of absolute ethanol, dissolving for 30 minutes and obtaining the semi-transparent displacement agent. The displacement agent prepared by a simple method can provide the system with high interface activity and high temperature resistance, salt resistance and calcium and magnesium ion resistance and can be used in crude oil extraction in oil fields.

The invention provides a rare earth complex. The rare earth complex is an ethylene diamine bis(maleic amide) rare earth complex, and the chemical formula of the rare earth complex is [RE(H2O)2.L]OH, wherein RE represents a rare earth element and L represents an ethylene diamine bis(maleic amide) group. The invention also provides a preparation method and an application of the rare earth complex as a polyvinyl chloride (PVC) stabilizing agent. The preparation method is simple, the cost is low, and thus the rare earth complex has an industrial application prospect. The provided rare earth complex or a composition thereof can be used as a PVC stabilizing agent, the shortages of conventional thermal stabilizing agents can be overcome, moreover, the primary coloring performance and long term stability of PVC are both improved; the rare earth complex, calcium stearate, organic tin, and pentaerythritol can generate a good synergetic effect and are capable of cooperatively improving the thermal stability of PVC; and at the same time, the mechanical properties of PVC are effectively improved.

Thermoplastic compositions are described that exhibit heat stability in addition to flexibility. Methods for forming the thermoplastic compositions are also described. The compositions include a polyarylene sulfide, an impact modifier and a heat stabilizer. The composition includes the impact modifier in a relatively large amount in combination with the heat stabilizer to provide long term heat stability to the composition and products formed therefrom such as coated wires and cables.

A thermoplastic resin composition of the present invention comprises: (A) an aromatic polyamide resin; (B) an aliphatic polyamide resin; (C) a first chelating agent comprising at least one of a carboxylic acid and a salt thereof, and an amino group; (D) a second chelating agent comprising an aromatic dicarboxylic acid; and (E) a filler. The thermoplastic resin composition has an excellent long-term heat stability, and thus has an advantage of maintaining mechanical properties even when exposed to high temperatures for a long period of time.

The invention relates to an auxiliary agent for inhibiting zinc burning and a preparation method thereof. The auxiliary agent for inhibiting zinc burning is composed of the following raw materials in mass ratio: 5-7 parts of organic dibasic acid, 45-55 parts of polyhydric alcohol, lubricant 9-11 parts, 19-21 parts of inorganic additives, 13-15 parts of magnesium stearate; the auxiliary agent for suppressing zinc burning of the present invention has effectively suppressed the zinc burning phenomenon of zinc-containing stabilizer in polyvinyl chloride, and improved The thermal stability of the product improves its processing performance and prolongs the service life of the product.