62results about How to "Improve low temperature flexibility" patented technology

A preparation process of a bicomponent castor oil polyurethane waterproof coating is characterized in that the coating is obtained by interpenetrating a component A of polyurethane prepolymer and a component B of a colorful color paste system under the action of an initiator and a catalyst; wherein the component A is obtained by allowing castor oil and 2,4-toluene diisocyanate to react in an organic solvent dissolved with an initiator; the component B is obtained by mixing a blending agent, a solid pigment and / or a solid filler with a coupling agent, milling, orderly adding a alkene monomer, a catalyst, a polymerization inhibitor, and a light stabilizer, and stirring uniformly. The coating of the invention has excellent waterproofness, a good apparent state, abundant colors, good decorative effect, adjustable curing time, adjustable film flexibility and hardness, and simple operations.

The invention provides a hydroxy acrylic resin for a reflective film, which is prepared by reacting the following components in parts by weight: 35-60 parts of organic solvent, 15-25 parts of first acrylic monomer, 25-35 parts of second acrylic monomer, 5-10 parts of third acrylic monomer and 0.3-1 part of initiator, wherein the first acrylic monomer is a non-substituted acrylate compound, the second acrylic monomer is a methacrylate compound, and the third acrylic monomer is a hydroxyacrylate compound. In the invention, the hydroxy acrylic resin prepared from the first acrylic monomer and second acrylic monomer has both low glass transition temperature and favorable strength; and the third acrylic monomer provides a crosslinkable functional group for the resin, thereby enhancing the temperature resistance of the resin. The experimental result indicates that the brittle temperature of the hydroxy acrylic resin provided by the invention can be down to -51 DEG C.

The invention relates to a high-water resistance formaldehyde-free and environment-friendly wood adhesive and a preparation method thereof. The adhesive is prepared through adopting modified PVA as a protective agent, and carrying out core-shell emulsion polymerization on vinyl acetate monomers and functional monomers. The adhesive comprises the following main components: modified PVA, vinyl acetate, styrene, vinyl acetate-ethylene copolymer resin, carbonyl allyl ester, fluorinated acrylate, an emulgator, an initiator, ultrapure water, an antifreezing agent, and the like. Compared with like products at home and abroad, the prepared emulsion prepared through adopting core-shell emulsion polymerization is better in mechanical strength; besides, the stability and water resistance of the product can be improved through adding the novel protective agent; further, the water resistance, storage stability, freezing resistance, and the like, of the prepared emulsion can be significantly improved through adding the functional monomers.

The invention discloses a preparation method of road surface joint glue. The petroleum asphalt with a mass percentage of 50-75% is heated to 160-170°C to a flow state; in the stirring state, 15-45% styrene-butadiene is sequentially added ethylene-styrene block copolymer, 30-60% compatibilizer, 4-10% polymer; then grind in a colloid mill with a rotation speed of 2000-4000rpm for 15min-45min, and the grinding temperature is 165-185°C; Then add 25-50% waste rubber powder, then stir at 175-195°C for 60-90 minutes; then at 150-170°C, add high-temperature viscosity-reducing components and plasticizers, cool down to 120-140°C and stir Swell in the state for 2-5 hours; finally cut the mixture, add 0.06-0.2% stabilizer, and react for 1-5 hours to prepare the road surface joint glue. This improves high temperature stability, low temperature flexibility, elastic recovery and fatigue resistance, and is suitable for pavement crack treatment in cold and extremely cold climates.

The invention discloses an asphalt mixture seam plaster for alleviating pavement cracks and a preparation method thereof, and the asphalt mixture seam plaster comprises the components of 16-18% of petroleum asphalt, 4-6% of building asphalt, 23-26% of a compatilizer, 3-5% of a thermoplastic elastomer, 1-3% of high temperature resin, 25-32% of waster rubber powder, 20-26% of talcum powder and 0.2-0.6% of a stabilizer. The preparation method is as follows: heating the petroleum asphalt, then adding the petroleum asphalt into the building asphalt for even mixing, after heating, beating into a working tank, and adding the compatibilizer; adding the thermoplastic elastomer and the high temperature resin, and shearing and finely grinding by a colloid mill while stirring to obtain a mixture; beating the mixture into a development horizontal tank, adding the waste rubber powder, the talcum powder and the stabilizer, stirring at 165-185 DEG C for development for 3-4H to obtain a cementing material; extruding for molding the cementing material and packing. The asphalt mixture seam plaster has the advantages of strong adhesion and self restoring deformation ability, can greatly improve high temperature deformation resistance, low temperature cracking resistance and fatigue resistance of asphalt pavements, reduces effectively alleviates asphalt pavement cracks, increases driving comfort, and reduces road construction investment frequency.

The invention relates to the field of chemical product preparation, particularly discloses a modified phenolic resin and a preparation method thereof. The preparation method comprises following steps:conveying distilled water, paraformaldehyde, sodium hydroxide and ethanol sequentially into a reaction kettle to be stirred, heated and subjected to heat preservation; after the heat preservation isfinished, cooling and dropwise adding a catalyst into the reaction kettle; after dropwise adding is finished, adding molten phenol and carrying out heating reaction; cooling after reaction, adding salicylic acid and m-cresol, carrying out first reduced-pressure dehydration, after dehydration, adding polydimethylsiloxane and tetrabutyl titanate, heating to carry out secondary reaction, reducing thekettle temperature after reaction, carrying out second reduced-pressure dehydration until the viscosity reaches a set range, and finally adding m-cresol to dilute and adjust the viscosity, thereby obtaining a modified phenolic resin solution; adding polydimethylsiloxane, so that the thermal stability and low-temperature flexibility of the phenolic resin are improved. Adding of the modified phenolic resin into varnished wires is capable of improving the scratch resistance and impact resistance of the varnished wires, and improving coating film surface leveling property, smoothness and gloss.

The invention belongs to the technical field of traffic, and discloses a novel material which is mainly used for steel bridge deck pavement to improve the pavement performance of steel bridge deck pavement. The asphalt material is softened and toughened by adopting a MBS core-shell grafted copolymer as a toughening agent and adopting a phenolic compound as a compatibilizing agent through the characteristics that the flexibility of the MBS core-shell grafted copolymer is good at low temperature and the MBS core-shell grafted copolymer can be soluble with asphalt, the interfacial tension between the asphalt and epoxy resin is decreased by serving the phenolic compound as a third phase through the characteristic that the phenolic compound can be soluble with the asphalt and the epoxy resin, and then the purpose that the blend system is stable is achieved.

The invention discloses an ultrathin color sealing layer material and a preparation method thereof. The ultrathin color seal material comprises the following raw material components in parts by weight: 5-85 parts of a color cementing material, 50-180 parts of water, 0.1-4.5 parts of an emulsifier, 1-12 parts of a stabilizer, 0.1-8 parts of a modifier and 25-110 parts of aggregate. The ultrathin color sealing layer material provided by the invention is used for a pavement, has the characteristics of high-temperature stability, good ductility, difficulty in embrittlement and excellent waterproofness and wear resistance, is used for a paving sealing layer of the pavement and is thinner, and the thickness of the ultrathin color sealing layer material is not more than 2mm.