11results about How to "Low gas permeability" patented technology

The invention relates to the technical field of organic coatings, in particular to a composite organic hydrogen-resistant coating for stainless steel and a preparation method thereof.The organic coating has an excellent hydrogen-resistant effect and meets the requirement of a stainless steel material for hydrogen resistance, the organic hydrogen-resistant coating comprises the chemical components of 40.5%-43.4% of epoxy resin, 28.9%-32.9% of a curing agent, 19.2%-24.8% of a diluent, 3.63%-4.13% of MoSe2, 0.21%-0.64% of silane modified graphene and 0.46%-1.07% of Ti3AlC2, the sum of the mass percentages of the chemical components is 100%. The prepared organic hydrogen-resistant coating is reasonable in chemical composition, good in hydrogen-resistant effect, simple in manufacturing method and easy to produce, and has remarkable production advantages, application value and social benefits.

This application relates to the field of rubber materials technology, and discloses a hybrid particle, its preparation method and application, and a low-gas-permeability rubber composite material. The general chemical structural formula of the hybrid particle is: M n+ ( ‑ OOC) n -RM n+ It is a coordinating metal cation, ( ‑ OOC) n -R represents the carboxylate ion. This application describes the preparation of novel hybrid particles by organic carboxylic acids and inorganic metal ions through organic-inorganic coordination hybridization. Benefiting from the partially organic properties and low surface polarity of these hybrid particles, they exhibit excellent compatibility with the rubber matrix. When introduced into rubber, they can disperse well in the rubber matrix and form excellent interfacial bonds without additional modification. This significantly extends the gas permeation path in the rubber network and effectively reduces gas escape at weak interfaces, thereby greatly improving the gas barrier properties of the rubber material and reducing gas permeation.

The invention discloses a composite diaphragm for alkaline water electrolysis as well as a preparation method and application of the composite diaphragm. The composite diaphragm sequentially comprises a polymer porous layer and a composite porous coating, wherein the composite porous coating contains a support body with a latticed structure; the polymer porous layer is composed of polysulfone and chitosan; the composite porous coating is composed of an alkali-resistant high-molecular polymer and inorganic nanoparticles. The composite diaphragm provided by the invention has high chemical and mechanical stability, high porosity and small aperture in a strong alkali medium, has good wettability to alkali liquor, low gas permeability and low surface resistance, and can restrain the problem of powder falling of the modified PPS diaphragm.

The present invention relates to the technical field of film preparation, and specifically discloses a biaxially oriented polypropylene oxygen barrier film and a preparation method thereof. The biaxially oriented polypropylene oxygen barrier film comprises a surface layer, a core layer and an inner layer; it is characterized in that the raw material for preparing the surface layer comprises the following components in parts by weight: 95-98 parts of copolymerized polypropylene resin and 2-5 parts of anti-blocking agent; the raw material for preparing the core layer is homopolymerized polypropylene resin; the raw material for preparing the inner layer comprises the following components in parts by weight: 95-98 parts of copolymerized polypropylene resin and 2-5 parts of anti-blocking agent. The biaxially oriented polypropylene oxygen barrier film has good oxygen barrier capability and also has good anti-slip performance.

The application provides a nanocellulose-based edible preservative liquid, a preparation method and a use method thereof. The nanocellulose-based edible preservative liquid comprises a nanocellulose solution, beeswax and glycerol. The preparation method comprises the following steps: mixing the nanocellulose solution, the beeswax and the glycerol according to a proportion and heating to melt the beeswax to obtain a mixed liquid; then, stirring and emulsifying the mixed liquid to obtain a nanocellulose emulsion; finally, performing vacuum defoaming treatment on the nanocellulose emulsion to obtain the nanocellulose-based edible preservative liquid. The application develops an edible and easy-to-wash preservative liquid based on nanocellulose, adopts a dipping coating mode to perform coating film treatment on fruits and vegetables, forms a micro-nano level preservative coating layer on the surface of the fruits and vegetables, can effectively reduce the loss of water and nutrients on the surface and inside of the fruits and vegetables, reduces the gas permeability of the preservative coating layer, and significantly enhances the mechanical strength of the preservative coating layer.

This invention discloses a high-barrier composite blown film of EVOH / organically modified mica powder and its preparation method, belonging to the field of polymer composite materials and food packaging technology. The composite blown film consists of 90-99 parts by weight of blow-molding grade ethylene-vinyl alcohol copolymer and 1-10 parts by weight of organically modified mica powder. The organically modified mica powder is obtained by surface modification of muscovite powder with silane coupling agent KH-570, with the amount of KH-570 being 1.5-3.0 wt% of the mass of the muscovite powder. In the preparation process, muscovite powder is first added to an alcoholic aqueous solution of KH-570, stirred, filtered, washed, and dried to obtain organically modified mica powder; then, dried EVOH and organically modified mica powder are premixed and melt-blended and granulated using a twin-screw extruder; finally, the composite granules are blown into a film. This invention utilizes the high aspect ratio and hydrophobic surface of organically modified mica powder to form a tortuous path effect in the EVOH matrix, significantly reducing oxygen and water vapor permeability. It exhibits good thermal stability, simple process, and is suitable for barrier packaging of lipid-based foods.

Provided is a condensation-reaction-curable silicone coating agent composition which contains, as a main component, a hydrolysable-group-containing organosiloxane mixture and also contains a curing catalyst, in which the hydrolysable-group-containing organosiloxane mixture contains an organotrisiloxane compound having a specified molecular structure in which there is at least one non-substituted, halogen-substituted or alkyl-substituted phenyl group in the molecule thereof and at least four hydrolysable groups are contained at molecule chain both ends thereof and an organodisiloxane compound having a specified structure in which there are at least two non-substituted, halogen-substituted or alkyl-substituted phenyl groups on one silicon atom in the molecule thereof and at least two hydrolysable groups are contained on the other silicon atom in the molecule thereof, and the organotrisiloxane compound and the organodisiloxane compound are contained in the hydrolysable-group-containing organosiloxane mixture at a specified blend ratio. The silicone coating agent composition has excellent storage stability although no organic solvent is contained, and can be cured rapidly at ambient temperature after being applied on a substrate to provide a cured coating film having excellent transparency, adhesiveness and the like, having excellent conformability to the shape of the substrate upon the bending of the substrate, and capable of preventing the corrosion of the substrate.

The invention discloses an offshore gas storage old well sealing layer superfine cement paste system which comprises the following components in parts by weight: 100 parts of oil well superfine cement, 1-3 parts of a suspending agent, 1-3 parts of a nano reinforcing agent, 1-3 parts of an expanding agent, 3-5 parts of micro silicon, 6-7 parts of a fluid loss agent, 0-0.35 part of a retarder, 0.05-0.06 part of a defoaming agent and 54-63 parts of water. The main technical indexes of the gas storage old well sealing layer superfine cement paste are as follows: the adaptive temperature is 60-100 DEG C; the density of the cement paste is 1.70-1.80 g / cm < 3 >; the initial consistency is less than 30Bc; the free liquid of the cement paste is 0; the upper and lower density difference of the cement stone column in a settlement stability test is less than 0.02 g / cm < 3 >; the water loss of the cement paste is less than 50ml; the 24-hour compressive strength of set cement is greater than or equal to 14 MPa; the gas permeability of the set cement is less than 0.05 * 10 <-3 > mu m < 2 >, the technical requirements of the gas storage old well seal layer superfine cement paste are met, and the field application result shows that the result meets the engineering requirements.

The invention discloses high-performance electric appliance insulation protection glue and a preparation method thereof, and the insulation protection glue comprises the following components in percentage by weight: 5%-20% of butyl rubber, 1%-5% of polyisobutene, 0.5%-3% of carbon black, 10%-40% of aluminum hydroxide, 20%-50% of talcum powder, 5%-15% of light calcium carbonate and 5%-15% of naphthenic oil. Meanwhile, the polyisobutene, the carbon black, the aluminum hydroxide, the talcum powder, the light calcium carbonate and the naphthenic oil are added, the butyl rubber is extremely low in gas permeability, the air permeability of the butyl rubber is only 1 / 7 of that of natural rubber, and the steam permeability of the butyl rubber is 1 / 200 of that of the natural rubber, so that the butyl rubber has relatively good sealing performance, the sealing effect of the insulating protection glue can be effectively improved, and the insulating protection glue has relatively high sealing performance; meanwhile, the butyl rubber shows good stability at a high temperature, can be used for a long time at 100 DEG C or a slightly low temperature, has relatively good anti-aging use performance, effectively improves the service life and the use stability, and has good shock absorption capability, so that the rubber has relatively good shock absorption and damping effects.

The application discloses a high-stability foam vacuum leak detection liquid and a preparation method thereof, relates to the technical field of foam vacuum leak detection, and is composed of the following components in percentage by weight: a foaming agent: 3-8%; a foam stabilizer: 0.5-3%; an anti-freezing agent: 5-15%; an anti-evaporation agent: 1-5%; a corrosion inhibitor: 0.1-1%; a tracer dye: 0.01-0.1%; and deionized water as the balance; wherein the foam stabilizer is a compound of hydrophobically modified hydroxyethyl cellulose and alkyl polyglycoside in a weight ratio of (1:2)-(2:1), and the foaming agent is a compound of an anionic fluorocarbon surfactant and a zwitterionic betaine surfactant in a weight ratio of (1:1)-(3:1). The high-stability foam vacuum leak detection liquid and the preparation method thereof have the advantages that the hydrophobically modified hydroxyethyl cellulose forms a tough polymer film at a gas-liquid interface, significantly reduces liquid film drainage speed and gas permeation rate, provides sufficient observation time for detection personnel, captures weak bubble signals generated by tiny leaks and intermittent leaks, and greatly reduces the missed detection rate.

The invention provides modified pulp and a paper-plastic product thereof. The modified pulp comprises 100 parts of paper pulp; and 0.01 to 20 parts of an additive. The additive at least comprises a biomass material, the biomass material comprises a component A, and the component A is selected from one or two of a biomass base material or a cationized biomass base material; the biomass base material and the cationized biomass base material are respectively of a dendritic structure, a fibrous structure, a sheet structure, a pinnate structure, a flocculent structure or a porous spongy structure. The modified slurry and the paper-plastic product thereof have good biodegradability, and meet the high efficiency of the technological process on the basis of having good mechanical properties, wear resistance and surface appearance properties.