48results about How to "Suitable glass transition temperature" patented technology

The invention discloses a low-temperature cured terminal carboxyl polyester resin for mixed powder coating. The polyester resin is prepared by performing melt polycondensation reaction on the following components in percentage by weight: 25 to 45 percent of polyalcohol, 35 to 65 percent of aromatic polyatomic acid, 0 to 10 percent of fat polyatomic acid, 0 to 2 percent of branching agent, 6 to 15 percent of acid hydrolysis agent, and 0.01 to 0.15 percent of esterification catalyst. The invention also discloses a method for preparing the low-temperature cured terminal carboxyl polyester resin. The prepared polyester resin has the characteristics of proper glass-transition temperature, softening point, good storage stability, and the like; the polyester resin, epoxy resin, filler and assistant in a certain proportion are mixed, and the mixture is prepared into powder through melt extrusion mixing, cooling, crushing and sieving; and the prepared powder can be cured at the temperature of 160 DEG C, and has the advantages of excellent leveling performance, good impact performance, and the like.

The invention discloses a mixed polyester resin for matte powder coating, which is obtained through the melting polycondensation by using the components with the following weight fraction: 23 percent to 50 percent of polyol, 35 percent to 65 percent of aromatic polybasic acid, 0 percent to 10 percent of fat polybasic acid, 0 percent to 2 percent of branching agent, 10 percent to 20 percent of acidulate agent and 0.01 percent to 0.15 percent of esterification catalyst. The invention also discloses a preparation method for a mixed polyester resin for matte powder coating. The polyester resin prepared through the method of the invention has the advantages of proper glass transition temperature,softening temperature, good storage stability, low cost, etc., and the matte powder coating with a gloss lower than 30 percent can be obtained by mixing the polyester resin with a certain proportion of the epoxy resin,stuffing, paint, flatting agent and matting agent and then melting, extruding, grinding and cribrating the mixtures and the obtained polyester resin has an outstanding mechanical performance and flatting effect.

The invention discloses weather resistant polyester resin with excellent water-boiling resisting performance, which is prepared through the melt polycondensation of the following components: 20-45 percent by weight of polyol, 40-55 percent by weight of aromatic polybasic acid, 0-8 percent by weight of fat polybasic acid, 0-5 percent by weight of branching agent, 5-15 percent by weight of acidolysis agent and 0.01-0.15 percent by weight of esterification catalyst. The invention also discloses a method for preparing the weather resistant polyester resin with excellent water-boiling resisting performance. The polyester resin prepared with the method has high glass transition temperature, high softening point, appropriate melt viscosity and appropriate storage stability. The powder coating produced from the polyester resin has excellent water-boiling resisting performance, good leveling performance and good impact performance, etc.

The invention discloses a polyester resin for a TGIC cured high-toughness powder coating. The polyester resin is obtained by a melting condensation polymerization reaction of the following raw materials in percentage by weight: 32-40% of a dihydric alcohol, 52-60% of an aromatic dibasic acid, 0.4-1.6% of a polyhydric alcohol, 2-8% of a fatty dibasic acid, and 0.01-0.15% of an esterification catalyst. The invention also discloses a preparation method of the polyester resin. The prepared polyester resin has an appropriate glass transition temperature, is suitable for a TGIC curing system; and a coating layer of the prepared powder coating has excellent flexibility, and also has excellent mechanical properties under conditions of the room temperature and the low temperature of about -10 DEG C.

The invention relates to a polyacrylate modified water-based enclosed isocyanate curing agent and a preparation method thereof. The curing agent is obtained by neutralizing and emulsifying a prepolymer formed by polyisocyanate semi-enclosed object and hydroxyl-containing polyacrylate, and the mole ratio of NCO to OH is 1-1.15:1. The hydroxyl-containing polyacrylate is prepared by: taking 10-50wt% of a solvent as the base material, and dripping a mixture composed of 5-15% of a carboxyl-containing vinyl monomer, 2-20% of a primary hydroxyl or secondary hydroxyl-containing acrylate monomer, 1-10% of a primary hydroxyl-containing epsilon-caprolactone modified vinyl monomer, 5-70% of other monomer containing a vinyl structure, 0.1-5% of a chain transfer agent and 0.05-3% of an initiator into the base material. The sealant and polyisocyanate for preparation of the polyisocyanate semi-enclosed object are in a mole ratio of 1.05-1.5:1. The curing agent has good miscibility with the matrix resin, high curing efficiency, low cost, flexibility and impact resistance.

The invention discloses an organosilicon modified carboxyl-terminated polyester resin for a heat-resistant powder coating. The organosilicon modified carboxyl-terminated polyester resin is formed by melt polycondensation reaction of the following components by weight percent: 5-25 percent of organosilicon, 25-45 percent of polyatomic alcohol, 35-65 percent of aromatic polyhydric acid, 0-5 percent of fat polyhydric acid, 4-15 percent of acidolysis agent and 0.01-0.15 percent of esterification catalyst. The invention further discloses a preparation method of the organosilicon modified carboxyl-terminated polyester resin for the heat-resistant powder coating. The polyester resin prepared by adopting the method has proper glass transition temperature, softening point and storage stability, and the powder coating prepared by the organosilicon modified carboxyl-terminated polyester resin has excellent heat resistance and is particularly suitable for polyester / TGIC curing systems.

The invention discloses a pure polyester resin for TGIC cured high temperature resistant powder coatings. The acid value, the glass transition temperature, the softening point and the 200DEG C melt viscosity of the pure polyester resin are 30-35mgKOH / g, 70-78DEG C, 112-118DEG C and 15000-20000mPa.s respectively. The pure polyester resin is obtained through a melt condensation polymerization reaction of monomers comprising 33-38mass% of diol, 58-65mass% of aromatic dibasic acid, and 1.5-5mass% of polyol. The invention also discloses a preparation method of the pure polyester resin. The pure polyester resin has a high glass transition temperature and is suitable for a TGIC curing system, and powder coatings prepared by using the pure polyester resin have the advantages of excellent heat resistance, and no gloss loss and high gloss retention of coating layers baked at 270DEG C for 2h or baked at 300DEG C for 0.5h.

The invention discloses polyester resin for a high-performance aqueous coating. The polyester resin is prepared by mainly carrying out melt polycondensation reaction on the following raw materials in percentage by weight: 25-70% of polylol, 1-20% of branching agent, 20-35% of aromatic polybasic acid, 5-20% of fat polybasic acid, 3-15% of acidolysis agent and 0.005-0.15% of esterification catalyst. The invention further discloses a preparation method of the polyester resin. The polyester resin provided by the invention is low in viscosity and good in storage stability, the adopted process is simple and feasible, and the polyester resin is used in a polyester resin / aqueous amino resin curing system; and the prepared aqueous coating has the advantages of excellent water-fast resistance, high glaze and excellent mechanical properties.

The invention discloses terminal hydroxy-carboxy bifunctional saturated polyester resin suitable for matting and transfer printing powder coatings and a preparation method of the polyester resin. Thepolyester resin provided by the invention is suitable for the matting and transfer printing powder coatings, the polyester resin has a proper glass-transition temperature and color lustre, and the prepared powder coating can be compounded with a matting agent to reach the gloss of 30 degrees, can be used in the field of thermal transfer, and has the advantages that the patterns are clear, paper iseasy to tear, and no glue imprints exist.

The invention relates to the technical field of film-forming materials and in particular relates to a self-crosslinking type waterproof emulsion, a preparation method of the waterproof emulsion and a waterproof base film prepared by utilizing the waterproof emulsion. The emulsion comprises the following raw materials in parts by weight: polyisocyanates, low polymer polyols, a chain extender, an end-capping reagent, a catalyst, a comonomer, an emulsifier, an initiator, a pH regulator and deionized water, wherein the comonomer is a mixture of a hard monomer, a soft monomer and a functional monomer according to a mass part ratio of (30-50):(10-20):(5-20). The emulsion can realize self-crosslinking and is high in crosslinking degree and high in weather resistance; the preparation method is simple in preparation process, and the environmental pollution is avoided in the preparation process; and the prepared waterproof base film is high in crosslinking degree, high in water resistance, high in impact resistance, high in tear resistance and high in binding force with the base surface and has relatively high flexibility and high weather resistance.

The invention provides an ultra-weatherproof carboxyl-terminated fluorine-containing polyester resin for a powder coating and a preparation method of the ultra-weatherproof carboxyl-terminated fluorine-containing polyester resin. The acid value of the fluorine-containing polyester resin prepared in the method is 23 to 35 mg KOH in every gram of resin, the hydroxyl value is smaller than 10 mg KOH in every gram of resin, the glass-transition temperature is 55 to 75 DEG C, the melt viscosity is 2000 to 22000 mPa.s per 200 DEG C, the number-average molecular weight is 2500 to 8000, and the fluorine content is 1% to 5% continuously adjustable. The ultra-weatherproof carboxyl-terminated fluorine-containing polyester resin has the advantages of appropriate glass-transition temperature, simple resin synthetic process, low cost and the like, and the powder coating prepared through curing of triglycidyl isocyanurate or hydroxyl alkyl amide has the advantages of ultra-weatherproof performance, high glossiness, excellent leveling, high impact property and the like.

The invention provides a high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for a powder coating and a preparation method thereof. Compared with the prior art, the fluorine-containing polyester resin prepared by the preparation method is a resin with acid value of 23-35 mgKOH / g, hydroxyl value of less than 10 mgKOH / g, glass-transition temperature of 55-75 degrees centigrade, melt viscosity of 2000-22000 mPa.s / 200 degrees centigrade and number-average molecular weight of 2500-8000. The high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating has the advantages of appropriate glass-transition temperature, storage stability, simple resin synthetic process, low resin cost and so on. The powder coating, which is prepared by curing the high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating together with triglycidyl isocyanurate or hydroxyl alkyl amide, has the advantages of super weather resistance, high gloss, superior levelling, excellent impact resistance and so on.

The invention discloses water boiling-resistant high-color fastness polyester resin for a TGIC powder coating. The water boiling-resistant high-color fastness polyester resin is prepared from 25 to 45% by weight of polyhydric alcohol, 40 to 60% by weight of polybasic acid, 5 to 15% by weight of a chain extender, 0.01 to 0.15% by weight of a catalyst and 0.05 to 2% by weight of a water boiling-resistant assistant through a melt phase polycondensation reaction. The invention also discloses a preparation method of the water boiling-resistant high-color fastness polyester resin for a TGIC powder coating. The polyester resin is TGIC gel-type resin, has good weatherability, has a moderate glass transition temperature and viscosity, has excellent resistance to water boiling and mechanical properties in an outdoor or humid environment and prevents coating fading after long-term use.

The invention provides glass powder used for silver paste on a front surface of a crystalline silicon solar cell and a preparation method of the glass powder. The glass powder is low-melting glass powder and comprises the following ingredients by weight percentage: 10-72% of PbO, 20-50% of TeO2, 2-20% of SiO2, 3-20% of B2O3, 1-5% of R2O, 0.5-10% of TiO2, 0.4-10% of V2O5, 1-20% of ZnO and 0.1-10% of P2O5, wherein R2O is selected from one or a mixture of metallic oxides containing Li, Na or K, so that the cost of raw materials of the glass powder is reduced on the premise that the property of the glass powder is not influenced. The glass powder is prepared by mixing and ball-milling of the raw materials weighed at a proportion; the glass powder is thinner and uniform in grain size and has the advantages that the cost is low, the melting point is low, the GTT (glass-transition temperature) is appropriate and the like, therefore, the utilization rate of the glass powder is greatly improved.

The invention discloses hydroxyl terminated polyester resin used for a powder coating, and belongs to the technical field of polymers. The hydroxyl terminated polyester resin is prepared from the following raw materials in parts: 30-45 parts of a polyhydric alcohol, 45-55 parts of an aromatic polybasic acid, 0.01-2 parts of a branching agent, 0.1-0.15 part of an esterification catalyst, 0.1-0.15 part of an antioxidant, 0.01-0.2 part of an inorganic pigment, and 0.2-0.3 part of a curing accelerant. The hydroxyl terminated polyester resin is obtained by performing melt esterification on the above components and performing a polycondensation reaction. The invention also discloses a preparation method of the hydroxyl terminated polyester resin and the powder coating prepared from the hydroxylterminated polyester resin. According to the method disclosed by the invention, the hydroxyl terminated polyester resin used for the powder coating prepared by the method not only has lower melt viscosity and a lower free-carboxyl content, but also has good storage stability; and the prepared powder coating is non-toxic and environmentally-friendly, has good levelling performance and weather resistance, is suitable for industrial large-scale production, and has great market application and promotion value.

The present invention relates to a material for preparing an intraocular lens. In particular, it relates to an ophthalmic medical material suitable for manufacture of micro-incision intraocular lens, having suitable water content and a suitable refractive index.

The invention belongs to the technical field of brick gum, and discloses quick-drying high-flexibility vitrified brick gum and a preparation method thereof. The vitrified brick gum comprises a liquid material component and a powder material component. On the basis of the total weight of the powder material component, the powder material component comprises the following components by weight: superfine Portland cement, aggregate, a water-retention thickening agent, an early strength agent and light calcium carbonate; and on the basis of the total weight of the liquid material component, the liquid material component comprises the following components by weight: styrene-butadiene latex, a mildew preventive, a defoaming agent, a sterilizing agent and water. The water-retention thickening agent is a mixture of a cellulose ether compound, xanthan gum and sepiolite. After being brushed, the gum can be quickly formed into a film and dried, so that the construction efficiency is improved, the bonding strength is ensured, and the gum has good flexibility.

The invention provides HAA (hydroxyalkylamide) cured carboxyl-terminated saturated polyester resin for thermal transfer powder coating and a synthesis method of the carboxyl-terminated saturated polyester resin. The resin is mainly prepared from raw materials in percentage by weight as follows: 30wt%-45wt% of polyol, 43wt%-55wt% of aromatic polyacid, 0.01wt%-3wt% of a branching agent, 8wt%-18wt% of an acidolysis agent, 0.03wt%-0.15wt% of an esterifying catalyst and 0.01wt%-2wt% of an antioxidant through melt polycondensation. The resin has the advantages that the resin has proper glass transition temperature and storage stability, the resin synthesis process is simple, the resin coat is low and the like, the resin components meet the requirement about polyester resin for powder coatings inGB / T 5237.4-2008 aluminum alloy building profile section 4: powder spray profile, a coating formed after the powder coating prepared from the resin and HAA is cured has good leveling and mechanical performance, has weather resistance meeting the class II standard in GB / T 5237.4-2008 aluminum alloy building profile section 4: powder spray profile, thermal transfer patterns are clear and have no offset print.

The invention relates to a transparent solid leveling agent which comprises the following raw materials in parts by weight: 4 to 14 parts of an initiator, 50 to 1,200 parts of a hard monomer, 0 to 450 parts of a functional monomer and 1 to 18 parts of a molecular weight regulator. The raw materials of the leveling agent do not contain any soft monomer; the leveling agent has extremely low surface tension and proper glass transition temperature, and is in a transparent solid state for a powder coating at normal temperature; a thermosetting powder coating prepared by compounding the leveling agent and another material is high in leveling performance, surface hardness, glossiness, durability and decoration performance; the leveling agent can be used for an indoor or outdoor metal section or building material, and is particularly suitable to be used as a special leveling agent for an optical coating of a transparent cover.

The invention discloses long-term anti-yellowing polyester resin as well as a preparation method and application thereof. The method comprises the following steps: mixing and performing condensation polymerization on one part of polyatomic acid, polyatomic alcohol, an esterification catalyst and a polymerization inhibitor, so as to obtain a first reaction system with the acid value being 10 to 18mg KOH / g; mixing the other part of the polyatomic acid and the first reaction system and performing transesterification, so as to obtain a second reaction system with the acid value being 48 to 56 mgKOH / g; performing vacuumizing condensation polymerization on the second reaction system, so as to obtain a third reaction system with the acid value being 28 to 35 mg KOH / g and the viscosity being 5000 to 15000 mPa.s; mixing the third reaction system and an antioxidant, and cooling and discharging, so as to obtain the long-term anti-yellowing polyester resin. Through the adoption of the method, the polyester resin with long-term anti-yellowing property can be obtained, is used for preparing white system powder coating, and has a wide application prospect in the field of white household appliances.

The invention provides a graphene oxide reinforced waterproof polymer emulsion preparation method, wherein 1000 parts of the graphene oxide reinforced waterproof polymer emulsion comprise the following raw materials: 3.3-5.5 parts of an amide hydrophilic small monomer for emulsification, 6.5-15.0 parts of an alkyl hydrophobic small monomer for emulsification, 0.12-0.35 part of an emulsion initiator a, 0.24-0.56 part of a chain transfer agent, 8.3-13.5 parts of an amide hydrophilic small monomer, 35-46 parts of a flexible small monomer, 23-32 parts of an ether polymer, 2.5-6.0 parts of an initiator b, 200-280 parts of an alkyl hydrophobic small monomer, 100-160 parts of an acrylate-based hard monomer, 2.6-7.5 parts of a cross-linking agent, 1.2-2.6 parts of a neutralizer, 2.3-4.0 parts of apH regulator, 0.64-1.35 parts of a functional monomer, and the balance of deionized water. According to the invention, the polymer emulsion with advantages of good stability, strong adhesion, excellent tensile strength, excellent wear resistance and excellent water resistance is synthesized by using the amide-based strong hydrophilic monomer and the long alkyl chain hydrophobic monomer as the rawmaterials through dispersion pre-emulsification, constant-temperature polymerization, variable-speed stirring, pH adjustment and a series of processes, wherein the amide molecules can enhance the adhesion of the polymer, and the tensile strength, the water resistance and the wear resistance of the film formed by the emulsion are remarkably enhanced by graphene oxide.

The invention discloses a low-temperature cured terminal carboxyl polyester resin for mixed powder coating. The polyester resin is prepared by performing melt polycondensation reaction on the following components in percentage by weight: 25 to 45 percent of polyalcohol, 35 to 65 percent of aromatic polyatomic acid, 0 to 10 percent of fat polyatomic acid, 0 to 2 percent of branching agent, 6 to 15 percent of acid hydrolysis agent, and 0.01 to 0.15 percent of esterification catalyst. The invention also discloses a method for preparing the low-temperature cured terminal carboxyl polyester resin. The prepared polyester resin has the characteristics of proper glass-transition temperature, softening point, good storage stability, and the like; the polyester resin, epoxy resin, filler and assistant in a certain proportion are mixed, and the mixture is prepared into powder through melt extrusion mixing, cooling, crushing and sieving; and the prepared powder can be cured at the temperature of 160 DEG C, and has the advantages of excellent leveling performance, good impact performance, and the like.

The invention provides triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin for thermal transfer printing powder coating and a synthesizing method of the triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin. The triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin is prepared by 30-45wt% of polyol, 43-55wt% of aromatic polyacid, 0.01-3wt% of branching agent, 8-18wt% of acidolysis agent, 0.03-0.15wt% of esterification catalyst, 0.01-2wt% of antioxidant and 0.01-1wt% of curing accelerator through melt polycondensation. The triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester is appropriate in glass-transition temperature and storage stability, simple in synthesizing process, low in cost and the like. The components of the triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin satisfy the requirements on polyester resin for powder coating in GB / T 5237.4-2008 Wrought Aluminum Alloy Extruded Profiles for Architecture-Part 4: Powder Coating Profiles, and the resin is applicable to the field of thermal transfer printing powder coating.

The invention provides a freeze-drying protective additive, a fluorescent PCR detection kit and a freeze-drying process, wherein the freeze-drying protective additive is used for freeze-drying a fluorescent PCR reagent, and the freeze-drying protective additive comprises the following components: trehalose, hydroxyethyl starch and Tween 20. According to the freeze-drying protective agent, the trehalose, the hydroxyethyl starch and the Tween 20 are adopted, so that the active conformation of protein is maintained in the freeze-drying process, the freeze-drying protective agent has a proper glass transition temperature, the protein is well protected in the freezing and dehydration processes, and the inhibition effect on PCR is avoided. The freeze-drying protective agent can be applied to freeze-drying of fluorescent PCR reagents of different manufacturers, and the product is high in universality and has no inhibition effect on the performance of the fluorescent PCR reagents.

The invention discloses a preparation method for a high polymer composite zirconia mobile phone back cover. Mullite whiskers are added to an aqueous solution of ethylene glycol, a suspension is formedthrough uniformly stirring, zirconia powder is added, and a precursor suspension is formed by uniformly mixing; the precursor suspension is transferred to a hydrothermal kettle for reaction to obtainprecursor powder; the precursor powder is transferred to a muffle furnace, the temperature is raised to 1200-1250 DEG C, and the temperature is maintained for 1-2h to obtain mullite whisker toughed zirconia ceramic powder; a polymer is heated to 260-265 DEG C, a filler, plasticizer and the mullite whisker toughened zirconia ceramic powder are added in turn, cutting and mixing are conducted at a high speed to form a viscous body, the viscous body is injection molded into a mold, the temperature is maintained for 6-10 min, warming treatment is conducted, and cooling is conducted to obtain the polymer composite zirconia mobile phone back cover. The method effectively increases the toughness and molding characteristics of the mobile phone back cover.

The invention discloses mixed polyester resin for an indoor thermal transfer printing matt powder coating. The resin is carboxyl-terminated saturated polyester resin, and has an acid value of 45-75 mgKOH / g, a glass transition temperature of 55-60 DEG C, a softening point of 93-103 DEG C, a melt viscosity of 3000-4500 mPa*s at 200 DEG C and reactivity of 150-250 s at 180 DEG C, and the resin is mainly prepared by performing a melt polycondensation reaction on the following monomer components in percent by mass: 30-37% of a diol, 0-3% of a trihydric alcohol, 55-62% of an aromatic dibasic acid,0-5% of a fatty acid, 5-10% of an acidolysis agent, 0.01-0.15% of an esterifying catalyst and 0.01-0.8% of a thermal transfer printing assistant. The polyester resin has a high glass transition temperature, good storage stability, and a good appearance levelling property. The invention also discloses a preparation method of the mixed polyester resin for the indoor thermal transfer printing matt powder coating.

The invention relates to the technical field of water-based acrylic acid waterproof emulsion preparation, in particular to transparent waterproof emulsion for an outer wall and a preparation method thereof, and the transparent waterproof emulsion comprises water, butyl acrylate, styrene, a cross-linking monomer, 2-ethylhexyl acrylate, a cross-linking assistant, an oxidizing agent, a reducing agent, a pH regulator, a defoaming agent, a preservative, an initiator, an emulsifier, a stabilizer and a special assistant. According to the transparent waterproof emulsion for the outer wall, the acrylic emulsion has strong ultraviolet resistance, and can improve the yellowing phenomenon of a coating film; the proper glass transition temperature can prevent the waterproof coating film from sticking dust and blackening in summer; the transparent waterproof emulsion has good film compactness, water resistance and water resistance recovery, has waterproof and breathable performance, and can avoid the phenomena that the waterproof film is whitened after being exposed to rain and the film is bulged and falls off after a period of time.

The invention provides a high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for a powder coating and a preparation method thereof. Compared with the prior art, the fluorine-containing polyester resin prepared by the preparation method is a resin with acid value of 23-35 mgKOH / g, hydroxyl value of less than 10 mgKOH / g, glass-transition temperature of 55-75 degrees centigrade, melt viscosity of 2000-22000 mPa.s / 200 degrees centigrade and number-average molecular weight of 2500-8000. The high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating has the advantages of appropriate glass-transition temperature, storage stability, simple resin synthetic process, low resin cost and so on. The powder coating, which is prepared by curing the high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating together with triglycidyl isocyanurate or hydroxyl alkyl amide, has the advantages of super weather resistance, high gloss, superior levelling, excellent impact resistance and so on.