101results about How to "High tensile shear strength" patented technology

The invention relates to a latent microcapsule curing agent initiating thermosetting epoxy resin curing at medium temperature and a preparation method of an adhesive thereof. The latent microcapsule curing agent is technically characterized in that the high-activity medium temperature curing agent is taken as a core material, thermoplastic high polymer microspheres are taken as a wall material, the solvent evaporation technology is adopted for preparing the latent microcapsule curing agent with better curing performance and latent performance, and the latent microcapsule curing agent can be applied to an epoxy resin system for preparing the single-component medium temperature curing epoxy resin adhesive. Microcapsules prepared by the method are high in capsule core content, smooth in surfaces, narrow in particle size distribution and good in compatibility with matrix epoxy resin and can be better dispersed in the epoxy resin; and the prepared single component adhesive can realize curing at the medium temperature, the storage period at room temperature is longer and the tensile shear strength performance can be further improved.

The present disclosure relates to impact strength modifiers, the derivative products thereof, and the use thereof in producing two-component epoxy resin compositions. The disclosure in particular relates to amino group terminated impact strength modifiers prepared by reacting a polyurethane prepolymer having isocyanate groups, a primary diamine, and optionally at least one Michael acceptor. The two-component epoxy resin compositions thus formulated are characterized by a great increase in impact strength while retaining an acceptable tensile shear strength. The impact strength modifiers according to the disclosure and the epoxy resin compositions comprising same are in particular suitable for vehicle manufacturing.

The invention relates to a high-toughness high-heat-conduction epoxy-imine resin system and a preparation method and application thereof. The high-toughness high-heat-conduction epoxy-imine resin system comprises epoxy resin, carboxyl-containing polyimide resin solution, firming agent, filler and organic solvent in a weight ratio of 100:100-200:30-50:30-50:150-250. The preparation method includes sequentially adding the epoxy resin, the carboxyl-containing polyimide resin solution, the firming agent, the filler and the organic solvent into a mixer, and mixing well to obtain the high-toughness high-heat-conduction epoxy-imine resin system. The high-toughness high-heat-conduction epoxy-imine resin system is applicable to preparation of glass cloth reinforced composite material. The high-toughness high-heat-conduction epoxy-imine resin system is moderate in viscosity and fine in usability. The preparation process is simple and convenient to operate. The glass cloth enhanced composite is high in impact resistance, fine in heat conductivity, high in heat resistance, and fine in electrical insulation.

The invention discloses an adhesive for repairing a wood structure of ancient buildings, and a preparation method and application method of the adhesive. The adhesive for the wood structure of the ancient building is prepared from epoxy resin, a modified amine curing agent, tris(dimethylaminomethyl)phenol, plant fibers, hollow microbeads, other extender pigment and an active diluent. The preparation and use method of the adhesive comprises the following steps: mixing the epoxy resin, the plant fibers, the hollow microbeads, the active diluent and the like according to a certain ratio, then adding the modified amine and the tris(dimethylaminomethyl)phenol according to a certain ratio, and completing adhesion within 40 minutes. The adhesive has the characteristics that the curing speed is high, no toxic or harmful gas is released, the adhesive property is excellent, and the like, and has relatively high popularization value in the field of ancient buildings.

The invention provides an anti-impact epoxy adhesive composition. By adopting two different kinds of epoxy resin as raw materials and adding a composite toughening agent at least including a liquid rubber toughening agent with a core-shell structure, epoxy resin modified nitrile butadiene rubber, a ketoxime-capped reaction type polyurethane elastic prepolymer and an epoxy resin modified polysulfide rubber toughening agent, the obtained epoxy adhesive composition has good impact resistance in normal-temperature and low-temperature conditions; the steel-steel tensile shearing strength is also obviously improved.

The invention provides a light-cured adhesive and a preparation method and application thereof.The light-cured adhesive is prepared from sulfydryl-terminated hyperbranched polyester, urethane acrylate, epoxy resin, a reactive diluent, a silane coupling agent and a photobase generator. Compared with the prior art, sulfydryl-terminated hyperbranched polyester is adopted as a preparation raw material, and an active diluent is supplemented, so that the viscosity of the adhesive system can be further reduced, the uniform dispersion and migration of active components generated after illumination inthe system are facilitated, the concentration of active components at the bottom layer can be improved, and deep curing can be quickly realized after heating and drying. Sulfydryl-terminated hyperbranched polyester, urethane acrylate and epoxy resin are used as reaction monomers, and under the action of alkaline light initiation of a photobase generator, sulfydryl double bonds / epoxy can be subjected to a rapid click chemistry type deep photocuring reaction. The polyurethane acrylate and the silane coupling agent are introduced, so that the toughness, the adhesive force and the waterproof performance of the adhesive can be effectively improved.

Moisture curable adhesives of high tensile shear strength contain an alkoxysilyl-terminated polymer and an alkoxy-functional silicone resin.

The invention discloses polyurethane foam gum with expandable graphite and diatomite to cooperatively enhance flame retarding, which is prepared from, by weight, 150-160 parts of diphenyl methane diisocyanate, 100-105 parts of trihydroxy polyoxypropylene ether, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphate, a proper amount of a 1 mol / L sodium hydroxide solution, 13-15 parts of diatomite, 5-6 parts of distilled water, 2-3 parts of triethanol amine, 3-4 parts of dibutyltin dilaurate, 3-4 parts of lauryl sodium sulfate, 5-6 parts of silicon oil, 3-4 parts of the expandable graphite, a proper amount of anhydrous ethanol, 0.8-1 part of cetyl trimethyl ammonium bromide, and a proper amount of deionized water. The foam gum is used for sealing switch cabinets and machine cabinets, is high in strength and is wear-resistant, can achieve on-site foaming and reduce production cost, has high total sealing performance, has simple and easy-to-control production process, and is safe and environment-friendly.

The invention discloses a high-temperature-resistant benzoxazine resin adhesive and a preparation method thereof, relates to a benzoxazine resin adhesive and a preparation method thereof, and aims to solve the problems of poor resistance of an existing benzoxazine resin adhesive to high temperature and weak tensile shear strength at high temperature. The adhesive comprises acetylene-terminated benzoxazine resin, a toughening agent, an organic solvent, a coupling agent and an inorganic filler. The method comprises the following steps: 1, placing dihydric phenol, aminophenylacetylene and paraformaldehyde in a four-neck flask, performing heating reaction and cooling, adding trichloromethane for dissolution, performing extraction, performing washing to neutral with de-ionized water, and performing drying to obtain the acetylene-terminated benzoxazine resin; 2, uniformly mixing the acetylene-terminated benzoxazine resin, the toughening agent and the organic solvent to obtain a base adhesive; 3, sequentially adding the coupling agent and the inorganic filler into the base adhesive, and performing uniform mixing to obtain the high-temperature-resistant benzoxazine resin adhesive. The adhesive is resistant to high temperature, has strong tensile shear strength at high temperature, and is used in the field of adhesives.

The invention discloses an organic grouting material for a road and a preparation method of the organic grouting material for the road. The organic grouting material for the road is prepared by foaming black and white polyurethane materials, wherein an epoxy resin-diethanolamine affixture (EP-DEA affixture) is also added into the white polyurethane material, and the addition of the EP-DEA affixture accounts for 5-20wt% of the total mass of the black and white polyurethane materials. The EP-DEA affixture is prepared by using a method comprising the following steps of mixing EP and DEA, and uniformly dispersing in a reaction vessel by taking butanone as a solvent; heating to 70 DEG C, maintaining the temperature and reacting for 4h; and removing the superfluous solvent through reduced-pressure distillation to obtain a slightly-yellow oily liquid, namely the EP-DEA affixture. When the organic grouting material for the road, disclosed by the invention, is used for filling a gap of the road by grouting and solidifying, the adhesive property of solidification filler is better and the compression strength is more approximate to the use requirement on the premise that the grouting performance is not influenced, and therefore, the organic grouting material is an excellent improved product of a pure black / white polyurethane product, which is maximally used at present.