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

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 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 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 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 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 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.