50results about How to "High retention rate of mechanical properties" patented technology

The invention discloses an immersion-resistant single-component deacidified organic silicon sealant composition and a preparation method thereof. The composition comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethyl siloxane, 5-50 parts of fumed silica, 10-30 parts of polydimethylsiloxane, 5-15 parts of a crosslinking agent, 0.01-0.5 part of a catalyst, 1-5 parts of a waterproof agent and 0.1-1 part of a tackifier. The single-component deacidified organic silicon sealant has excellent adhesive property, and the safety and stability of the single-component deacidified organic silicon sealant in the using process are ensured; and the single-component deacidified organic silicon sealant still has excellent adhesive property with a base material after being subjected to long-term immersion or short-term high-temperature boiling treatment and is high in mechanical property retention rate and better in waterproofness as comparison with a common silicone sealant.

A polarity-modified polypropylene composite material and a preparing method thereof are disclosed. The composite material comprises following components by weight: 60-90% of polypropylene, 5-15% of a flexibilizer, 0-30% of a mineral filling material, 1-3% of a polarity additive, 0.1-0.3% of an assistant polarity additive, 0.4-3% of an anti-ageing agent and 0-0.5% of a coloring agent. The assistant polarity additive is a nonionic ester type surfactant. According to the composite material and the preparing method thereof, by addition of an extremely low amount of the polarity additive and the assistant polarity additive, the adhesion force of the composite material and a coating is enhanced and the composite material maintains excellent mechanical properties. The method can be performed by adoption of a double-screw extruder at present and has characteristics of simple preparation, easy implementation and operation, easy industrial production and wide application prospect.

The invention provides a glass-fiber-reinforced hydrolysis-resistant polyester material which is prepared from the following raw materials in percentage by weight: 30-80% of polyester, 5-40% of glass fiber, 3-10% of compatilizer, 0.3-20% of hydrolytic reagent, 0.1-0.5% of antioxidant and 0.1-0.5% of lubricant. The invention also provides a preparation method of the glass-fiber-reinforced hydrolysis-resistant polyester material, which comprises the following steps: mixing the raw materials according to the percentage by weight, putting in a screw rod machine, extruding, and cooling with water to granulate, wherein the rotation speed of the screw rod machine is 180-600 rpm, and the temperature is 235-255 DEG C. The material provided by the invention has the advantages of better mechanical properties, high hydrolysis resistance, high mechanical property retentivity, favorable flowability, fewer surface floating fibers, excellent processability and low cost, and has very wide application prospects in the fields of electronics, electricity, automobiles, home appliances and the like.

The invention discloses a high-rigidity high-durability carbon fiber enhanced polyamide composite material and a preparation method thereof. The high-rigidity high-durability carbon fiber enhanced polyamide composite material is prepared from the following raw materials by weight percent: 60-90% of polyamide resin, 5-10% of flexibilizer, and 10-30% of surface treated carbon fibers, wherein the surface treated carbon fibers are carbon fibers treated with a polyurethane prepolymer previously. Compared with the prior art, the high-rigidity high-durability carbon fiber enhanced polyamide composite material has the advantages that on one hand, no any solvent is used in the surface treatment process of the carbon fibers, the process is simple, the attachment effect of the polyurethane prepolymer on the surface of the fibers is good and an excellent bonding interface layer can be provided for the composite material, and on the other hand, the interface debonding phenomenon caused by factors such as moisture diffusion and thermal expansion is effectively prevented by virtue of effective fiber surface treatment, and as a result, the durability of the composite material in complex environments, especially under a high-humidity condition, is improved.

The invention discloses a high polar polypropylene composite material. The raw material composition comprises the following components in percentages by weight: 50-88% of polypropylene, 5-15% of a flexibilizer, 0-30% of a mineral filler, 5-10% of modified polyvinyl chloride, 1-5% of hyperbranched polyesteramide, and 0.1-5% of an auxiliary agent. Modified polyvinyl chloride and hyperbranched polyesteramide are added, so that polarity of the polypropylene composite material is improved, excellent mechanical properties are maintained, and the product can be used as a material special for exteriortrim of automobiles. A preparation method of the high polar polypropylene composite material is provided, and the method employs a double screw extruder for realization, the preparation is simple, the method is easy to carry out and operate, industrial production is easy, and the method has wide application prospects.

The invention discloses a weather-resistant polyformaldehyde composition which is prepared from following raw materials, in a fusion manner, by mass, 91.5-97.5% of a copolymerized polyformaldehyde resin, 0.1-0.6% of a polymerization-type ultraviolet absorbent, 0.1-1.0% of a polymerization-type light stabilizer and 1.0-5.0% of an ultraviolet shield agent. In the polyformaldehyde composition, the large-molecularized ultraviolet absorbent and the large-molecularized light stabilizer are employed with addition of the ultraviolet shield agent, so that the polyformaldehyde composition can effectively absorb, shield and reflect ultraviolet in sun and prevent the ultraviolet from entering the polyformaldehyde, thereby effectively stopping photo-degradation of the polyformaldehyde, avoiding molecule chain interruption to form hydroxyl groups and carboxyl groups, so that the weather resistance of the polyformaldehyde composition is enhanced. In the invention, the ultraviolet absorbent and the light stabilizer are both large-molecularized ultraviolet absorbents so that the polyformaldehyde composition is excellent in weather resistance and meanwhile volatilization and migration of small molecules in an additive can be prevented. The polyformaldehyde composition is prolonged in service life under an illumination environment and a wet and hot environment, is increased in use value and can satisfy requirement in special fields.

The invention discloses an anti-ultraviolet aging and scratch-resistant polypropylene material and a preparation method thereof. The anti-ultraviolet aging and scratch-resistant polypropylene material is composed of polypropylene resin, coated nano-titanium dioxide, benzotriazole light stabilizer, inorganic filler, coupling agent, antioxidant and lubricant. At the same time, a preparation method of an anti-ultraviolet aging and scratch-resistant polypropylene material is also disclosed. In the present invention, a layer of dense and uniform silicon dioxide film is coated on the surface of nano-titanium dioxide particles by a liquid-phase deposition method to prepare coated nano-titanium dioxide, which can effectively avoid the degradation of polypropylene substrates by nano-titanium dioxide. The compound use of benzotriazole light stabilizers makes the prepared polypropylene material have strong UV shielding performance, high retention rate of mechanical properties after UV aging for 1000 hours, small degree of pulverization, high surface hardness and scratch resistance The effect is good, and it can be widely used in home appliance shells, automotive interiors and other products.

The invention discloses a high-performance carbon fiber reinforced polyamide composite material, which comprises the following components in percentage by weight: 60-85% of polyamide resin, 3-10% of flexibilizer and 10-30% of surface functionalized carbon fiber. The high-performance carbon fiber reinforced polyamide composite material has the beneficial effects that 1. the surface carboxyl functionalization of carbon fiber is realized, the surface structure of the carbon fiber is not damaged in the whole reaction process, the self mechanical property of the carbon fiber is not influenced, and the compatibility between the carbon fiber and a resin matrix can be improved by introducing the surface carboxyl functional group of the carbon fiber; and 2. the interface unsticking phenomenon caused by thermal expansion, water diffusion and other factors can be effectively prevented, and the carbon fiber reinforced polyamide composite material can be guaranteed to have high mechanical property conservation rate in an environment of high temperature and high humidity.

A non-halogen fire-retardant nylon6 and nylon66 alloy consists of nylon6 30-65wt%, nylon66 30-65wt%, fire retardantA0.1-15wt%, fire retardantB0.1-15wt%, carbon-forming agent 0.1-2wt%, antioxidant 0.1-1wt% and anti-ultraviolet agent 0.1-1wt%. It has no environmental pollution, has efficient fire-retardant performance, better rigid, heat-resisting performances and stable size. It can be used for various household electrical appliances.

The invention discloses a PBT composition resistant to cyclic injection molding and a preparation method thereof. The PBT composition resistant to cyclic injection molding is prepared from the following components in parts by weight: 50 to 80 parts of PBT, 10 to 40 parts of glass fiber, 1 to 3 parts of an epoxy resin, 0.1 to 0.3 part of an antioxidant, 2 to 8 parts of an ethylene-butyl acrylate copolymer and 0.5 to 2 parts of trimethylol propane triacrylate. According to the invention, through the synergistic effect of trimethylol propane triacrylate, an ethylene-butyl acrylate copolymer and an epoxy resin, breakage of a PBT molecular chain is effectively prevented, so that the degradation degree of the PBT material in multiple injection molding processes is reduced, and the mechanical property retention rate of the PBT composition after multiple injection molding is further improved; and the mechanical property retention rate of the PBT composition is greater than or equal to 97% after secondary injection molding, the mechanical property retention rate is greater than or equal to 91% after third injection molding, and the PBT composition is suitable for multiple times of cyclic injection molding.

The invention discloses a method for quickly and efficiently recycling a high-performance resin-based carbon fiber composite material. The method is used for solving the technical problem of poor practicability of an existing method for recycling the carbon fiber reinforcement resin-based composite material. According to the technical scheme, the method comprises the steps that a waste carbon fiber reinforcement resin-based composite material is put into glacial acetic acid and pretreated for 30-40 minutes at 108-112 DEG C. The pretreated waste carbon fiber reinforcement resin-based compositematerial is put into a drying oven of 90-95 DEG C for being dried, then put into a mixed solution degradation system with dimethyl sulfoxide and potassium hydroxide and degraded for 40-70 minutes at 150-180 DEG C, and the solid product after degradation is separated, cleaned through deionized water and dried. The dried solid product is weighed, and the degradation rate is calculated. According tothe method, the recycle efficiency is high, the conditions are mild, the surface appearance of recycled carbon fibers is good, and the retention rate for the mechanical properties is high.

The invention discloses an ultraviolet curing adhesive with high hydrophobicity. The ultraviolet curing adhesive consists of the following raw materials in percentage by weight: 30-60 parts of fluorine modified urethane acrylate resin, 20-40% of a silane modified acrylate monomer, 15-30% of a methacrylate monomer and 1-7% of a photoinitiator. The ultraviolet curing adhesive with high hydrophobicity, which is disclosed by the invention, is good in hydrophobicity, high in mechanical property retention rate after being soaked into water, large in contact angle with the water, excellent in cured substance property, high in adhesion reliability and wide in application range.

The invention discloses a high-weather-resistant high-tenacity reinforced polypropylene material for a post insulator and a preparation method of the reinforced polypropylene material. According to the key point of the technical scheme, the reinforced polypropylene material contains the following components in percentage by weight: 41%-70% of random copolymerization polypropylene, 5%-10% of a compatilizer, 0.5%-2% of a compound weather-resistant agent, 0.3%-1% of a lubrication dispersing agent, 0.4%-1% of an antioxidant, 20%-40% of glass fibers and 2%-5% of a toner. The high-weather-resistanthigh-tenacity reinforced polypropylene material for the post insulator has the advantages that the weather resistance and the tenacity are high, the retention rate of mechanical performance under a photothermal oxygen aging condition is high, the color stability is good, and the like.

The present invention provides a polypropylene material and its application as UV-ray resisting and anti-ageing material. The described polypropylene material is made up by adding beta nucleating agent into the polypropylene material, and the addition of beta crystal type nucleating agent can make the polypropylene material produce beta crystal type conversion, as compared with alpha crystal type polypropylene material, after it is irradiated by UV ray, the retaining rate of mechanical performance of said material can be greatly raised, and the effect obtained by means of beta crystal type conversion can be identical to that obtained by adding UV-photostabilizer.

The invention provides an adhesive resin for an anti-ultraviolet aging type steel wire mesh framework polyethylene composite pipe. The adhesive resin comprises the following components by mass: 20-40 parts of modified polyethylene; 30-50 parts of a functional polymer; 10-20 parts of phenol resin; 1-10 parts of filler; and 1-3 parts of a stabilizer. The adhesive resin provided by the invention has the advantages of high peel strength, high tensile strength, high bonding strength, excellent ultraviolet aging resistance and high mechanical property retention rate after long-time sunlight irradiation, has great significance in enhanced production of composite pipes, and due to the excellent ultraviolet aging resistance, the prepared steel wire mesh framework polyethylene composite pipe is long in service life, and the enhanced production and the service life prolonging of the composite pipe are greatly improved.

The invention discloses an ultraviolet curing adhesive with brine resistance, and a preparation method thereof, and belongs to the technical field of photocuring materials. In order to solve the problem that a conventional ultraviolet curing adhesive has obvious limitation in application of saline-resistant water, the invention provides the ultraviolet curing adhesive which consists of a polyurethane acrylate prepolymer with a polybutadiene structure, an acrylate monomer, a photoinitiator, a cross-linking agent and a flatting agent. The adhesive has the advantages of low water vapor transmission rate, good chemical resistance and excellent flexibility. Particularly, the adhesive has better salt water resistance, high mechanical property retention rate after being soaked in salt water, large contact angle with water, excellent cured product performance and high bonding reliability, and is suitable for various coatings requiring strict humidity control. In addition, the preparation method of the ultraviolet curing adhesive is simple, short in flow, low in equipment dependence and suitable for industrial large-scale production.

The invention discloses a polyester composite material. The polyester composite material comprises, by weight, 100 parts of polyester resin; 0.1 to 10 parts of an irradiation cross-linking agent; 10 to 35 parts of an epoxy polymer; and 100 to 300 ppm of tetrahydrofuran or derivatives thereof. According to the invention, the epoxy polymer and the tetrahydrofuran or the derivatives thereof are added into the irradiation cross-linked polyester composite material system, when the polyester composite material is damaged, the damaged part can be repaired through irradiation cross-linking, and the polyester composite material with good repairability (especially structural damage caused by oxidation and hydrolysis) is obtained.