130results about How to "Extend the usable time" patented technology

The invention discloses an epoxy mortar used for repairing sea oil gas pipeline and a preparation method thereof, which belongs to the technical field of polymer mortar application. The epoxy mortar is composed of a component A, a component B and a component C, the component A is prepared by bisphenol A epoxy resin E44, E51 and a certain amount of auxiliary agent, the component B is prepared by mixing a T31-3 type modified phenolic amine curing agent and a NP440 amidoamines curing agent according to a certain proportion, and the component C is an aggregate by mixing cement and quartz sand according to a certain proportion. The preparation method comprises the following steps: heating the component A to the temperature of 30-50 DEG C, stirring to homogeneous phase, then mixing the component A and the component B according to a certain proportion, uniformly mixing, adding the component C according to a certain proportion, and uniformly blending to obtain the epoxy mortar. The preparation method has simple technology, the epoxy mortar has strong cohesiveness, the epoxy mortar through solidification has excellent anti-compression, anti-punching and anti-seawater corrosion performances, and the epoxy mortar can be used for repairing and reinforcing a concrete coating on the sea oil gas pipeline and a thin layer of an underwater concrete structure.

The invention discloses a casting inorganic binder suitable for curing by hot air, a preparation method and application thereof, wherein the binder contains 30-40 parts of 200-400-mesh aluminium hydroxide, 140-180 parts of 80-90% phosphoric acid, 6-12 parts of 200-400-mesh boric acid, 10-20 parts of 200-400-mesh magnesium carbonate, 5-10 parts of 200-400-mesh zinc oxide, and 150-280 parts of water. The binder disclosed by the invention is cured by hot air; dust pollution of adding a powder curing agent when the sand is mixed is avoided; core sand can be used for a long period of time; no substance with poison or pungent odor is discharged in the whole process; the poured cast oil sand is easily cleaned; and the workload of a worker is reduced.

The invention relates to a liposome calcium sulfate composite nanometer artificial boneware, as well as a preparation method and application thereof. The preparation method comprises the steps of well mixing liposome (1 to 40 percent), calcium sulfate powder (40 to 80 percent) and diluent (10 to 50 percent), curing the materials and then preparing a bone graft substitute containing nanometer liposome. The liposome can carry medicine and can modify surface, has two forms, namely solution and powder, and comprises traditional micromolecule liposome and macromolecule liposome having macromolecule characteristics. The invention can provide an artificial bone material which has nanometer reinforcing effects, function of sustaining and controlling medicine release, controllable degradation time, good biocompatibility and mechanical strength, can induce bone growth in vivo, and is beneficial to the healing of defective areas of bones.

The invention discloses a chill-free processing method of a wind-driven generator hub, and the method comprises the following steps: manufacture of a mould, manufacture of a sand mould and moulding by casting, wherein in the manufacture of the sand mould, a completely opened bottom gating system is utilized; an ingate is designed to be disc-shaped; a downgate on an upper sprue is a quantitative ladle stopper sprue gate; the ratio of the components is F(straight):F(transverse):F(internal)=1:(1.5-2):(25-28); a rectangular vent hole is arranged at the highest point at the top face of a casting; the total section area of the rectangular vent hole is greater than that of the ingate; a casting head is arranged on the top face of the casting; the height of the single casting head is greater than 400 mm; no chills are discharged during the manufacture procedure; in the moulding by casting, the casting speed of melted iron entering into a casting cavity is controlled within 0.5-1.0 m/s; the casting time is controlled within 150-210 seconds; and the casting temperature is between 1300 and 1310 DEG C. The chill-free processing method of the wind-driven generator hub disclosed by the invention has the advantages that the method adapts to the large scale production of low-temperature ductile iron castings for large wind-driven generator with quite high requirements, the process is simple, and the production cost is low.

The present invention discloses a characteristic aldehydeless cold core box resin. It includes two components of A and B. The component A is synthesized by using formaldehyde, benzophenol, modified animal fat and aromatic solvent as main raw material through chemical reaction, and the component B is made up by using polymeric isocyanate and modified animal fat as main raw material. Said invention can greatly raise the strength of sand core and sand mould.

The invention belongs to the technical field of isocyanate curing agents, and discloses a rapidly-dried water-dispersible isocyanate curing agent composition and a preparation method thereof. The rapidly-dried water-dispersible isocyanate curing agent composition disclosed by the invention comprises the following two parts: 50-95 parts by mass of a hydrophilically modified aliphatic polyisocyanatepart and 5-50 parts by mass of a non-hydrophilically modified aromatic polyisocyanate part. After emulsification in a water system, the non-hydrophilically modified aromatic polyisocyanate is partially wrapped by the hydrophilically modified aliphatic polyisocyanate, so that long usable time can be kept in a water phase. After water of coating construction is volatilized, the drying speed is greatly improved, and a long usable time is achieved while rapid drying is realized. The problem that an application is limited due to the fact that hydrophilically modified aliphatic polyisocyanate is fast in drying speed but very short in usable time and hydrophilically modified aliphatic polyisocyanate is slow in curing speed is solved.

The invention discloses a liquid curing agent for a phosphate bonding agent and application thereof. The curing agent comprises two components, wherein 45.16%-55.17% of silane coupling agent serves asthe component I; 44.83%-54.84% of the component II comprising water and citric acid, and the component II, the citric acid accounts for 9.68%-17.24%, and the water accounts for 27.59%-45.16%. The liquid curing agent disclosed by the invention is wide in ram material source, low in cost and simple in preparation and application process. The liquid curing agent is long in using time when used for self-hardening sand production and short in demolding time and is used for bowing hardening of cold core boxes. The adopted compressed air is low in cost, environment-friendly and free of pollution.

The invention provides water-based single-component modified epoxy resin as well as a preparation method and application thereof. The water-based single-component modified epoxy resin comprises the preparation raw materials: epoxy resin, a modifier, an adhesion promoter, a catalyst, an initiator, a hydrophilic monomer, a cosolvent and a neutralizer, wherein the epoxy resin comprises at least one of E20, E44, E51, E54, F51 and E12. The water-based single-component modified epoxy resin is convenient to use, long in service life, quick to dry, high in gloss, good in salt mist resistance, particularly good in adhesive force to substrates difficult to adhere, such as galvanized plates and aluminum plates, wide in universality and environmentally friendly. The invention also provides a coating composition containing the water-based single-component modified epoxy resin and a coating product.

The related preparation method for a controllable solidifying CaSO4 bone adhesive comprises: mixing 40-80wt% dehydrated CaSO4 and 1-20wt% adjuvant to age for 1-48h, mixing material and 10-50wt% solidifying solution for 2-5min, and hydrating to obtain the slurry. This invention has well performance for medical purpose.

In allusion to problems existing in the prior art, the invention provides a production method of a tung oil modified triethylamine cold-box resin component I. The production method of the tung oil modified triethylamine cold-box resin component I includes the following raw materials (by weight): 25-40% of phenol, 2-8% of tung oil, 0.01-0.04% of a catalyst 1, 11-19% of paraformaldehyde, 0.04-0.1% of a catalyst 2, 1-2% of a regulator, 12-24% of dibasic acid ester, 14-25% of high-boiling-point aromatic solvent oil, 2.5-5% of a high-boiling-point plasticizer, 2-6% of ethyl silicate and 0.5-1% of a reinforcing agent. According to the invention, tung oil and phenol are subjected to a cationic alkylation reaction under an acidic condition, and then modified phenol and formaldehyde react to generate tung oil modified phenolic resin. Then, the triethylamine cold-box resin component I which has high molding-sand strength, good high-temperature property and good wet resistance, has long service time and excellent environment protection property and can satisfy batch core production is obtained.

This invention relates to elasticity styrene - acrylate waterproof latices and its preparation method. It is polymerized by nine kind component and seed emulsion. The preparation method includes as follows steps: whip, vacuumize, whip, polymerization, thermal insulation, cooling, thermal insulation, cooling, filter, casing. This invention has low cost, stable color phase, moderate consistency, good acid and alkaline protection, and lower vitrification point. It can effectively eliminate liberation monomer, avoid enviroment pollution. This invention especially fit for cement group polymer waterproof, waterproofing work as well as impervious seal stuff.

The invention belongs to the technical field of water-based resin, and discloses a hydroxyl acrylic resin aqueous dispersion and a preparation method thereof. The hydroxyl acrylic resin aqueous dispersion comprises the following preparation raw materials: a hydroxyl-containing unsaturated monomer A1, a hydrophobic unsaturated monomer B1, a hydroxyl-containing unsaturated monomer A2, a hydrophobicunsaturated monomer B2, an unsaturated monomer C containing an HDI trimer structure, and a hydrophilic monomer D containing carboxylic acid or sulfonic acid. The hydroxyl acrylic resin aqueous dispersion prepared from the unsaturated monomer C containing the HDI trimer structure can be compounded with a solvent type isocyanate curing agent with low price, so that the high-gloss water-based two-component polyurethane coating is obtained. The water-based two-component polyurethane coating has excellent bubble-free film thickness, can be used for a long time and has water resistance.

The invention discloses water-based two-component matte white finish paint and a preparation method thereof, and relates to the technical field of water-based paint. The technical key points are as follows: the water-based two-component matte white finish paint comprises a component A and a component B. The component A comprises the following components in parts by weight: 15-40 parts of hydroxy acrylic resin; 15-40 parts of polyurethane; 0.3-0.8 parts of an amine neutralizer; 0.1-0.5 parts of a wetting agent; 0.5-1 parts of a de-foaming agent; 2-6 parts of a coalescing agent; 0.2-0.6 parts ofa thickening agent; 0.5-1 parts of a delustering agent; 25-30 parts of white pulp; 1-3 parts of a wax additive; 0.05-0.1 parts of a preservative; 5-10 parts of water; the component B is prepared fromthe following components in parts by weight: 32-64 parts of HDI; 20-60 parts of IPDI; 7-15 parts of PGDA; and 0.1-0.5 parts of a dehydrating agent. The water-based two-component matte white finish paint prepared by adopting the formula has the advantages of the long service life and recyclability.

The invention relates to the technical field of polymer films, in particular to a super-hydrophobic polyolefin hollow fiber membrane for an oxygenation membrane and a preparation method of the super-hydrophobic polyolefin hollow fiber membrane. Polyolefin is used as a raw material, a three-channel spinning nozzle is used, and the material is prepared through a thermally induced phase separation method. A membrane casting solution formed by a polyolefin solvent is a solution system with the highest critical dissolving temperature, polyolefin can be dissolved in the corresponding solvent when the temperature is higher than the highest critical dissolving temperature, and liquid-liquid phase separation occurs when the temperature is lower than the highest critical dissolving temperature. Thepore diameters of the inner surface and the main body structure of the prepared hollow fiber membrane are uniform, and the hollow fiber membrane is of a spongy bicontinuous network structure; the outer layer is composed of spherical crystals which have a certain thickness and are closely arranged; and a composite structure with a spherical crystal structure embedded into a bicontinuous reticular structure is formed close to the outer layer, namely the junction of the outer layer and the membrane main body structure. The hollow fiber membrane prepared by the invention has high gas transmissionproperty, blood compatibility and plasma leakage resistance, can be directly used for extracorporeal membrane pulmonary oxygenation, and can reduce the use of a blood compatibility coating.

The invention relates to a mould for producing multi-layer shaped parts of plastic comprising at least two mould halves (1, 2, 6) and a cavity (4), in which the plastic is held, a gating system (9) with a runner and an exchangeable separating mould insert (5), as well as a method for producing the multi-layer shaped parts of plastic.

An anti-collision alarm device for a shopping cart according to the present invention comprises a vehicle frame, an anti-collision module, a power supply module and an alarm module are arranged on the vehicle frame, the anti-collision module includes an arc-shaped anti-collision plate, and the anti-collision plate Located at the front end of the shopping cart, an anti-collision spring is clamped between the anti-collision plate and the shopping cart; the alarm module includes a first induction switch, a second induction switch and an alarm; the anti-collision plate A first connecting rod is provided between one end and the first induction switch, a second connecting rod is provided between the other end of the anti-collision plate and the second induction switch, and the first induction switch and the The second induction switch is electrically connected to the alarm respectively; its anti-collision module is retractable, and when it hits a person or an object, the anti-collision module retracts to reduce the impact force, prevent collision accidents, and alarm The module will emit an alarm sound to remind the pusher and the hit person to pay attention to avoiding.