15 results about "Vinylacetic acid" patented technology

The invention relates to the technical field of flame-retardant materials, in particular to a halogen-free low-smoke flame-retardant material and a preparation process thereof. The halogen-free low-smoke flame-retardant material is prepared from the following raw materials: an ethylene-vinyl acetate copolymer, linear low-density polyethylene, maleic anhydride grafted modified polyethylene, a composite flame retardant, magnesium hydroxide, a synergistic flame retardant, an interface modifier and the like. The composite flame retardant is prepared from a sulfydryl-containing silane coupling agent, aluminum hydroxide and vinyl acetate. A composite flame retardant is prepared from a mercapto silane coupling agent, aluminum hydroxide and vinyl acetate as raw materials, the composite flame retardant is introduced into a material system, the dispersity and compatibility of inorganic filler in a polymer group are improved, a more continuous cross-linked network structure is formed, high-speed dry mixing, melt mixing and extrusion molding by a double-shaft eccentric rotor extruder are adopted, and the flame-retardant composite material is prepared. The processability of the material and the quality of a final product are improved, and the flame retardant property of the material is improved through the synergistic effect of the synergistic flame retardant.

The invention relates to water-soluble polysiloxane as well as a preparation method and application thereof. The preparation method of the water-soluble polysiloxane comprises the following steps: mixing lipase, trehalose and a surfactant to prepare modified lipase; vinyl acetate, alkoxy silane, monomethoxy polyethylene glycol and the modified lipase are mixed, and the water-soluble polysiloxane is prepared. According to the preparation method, the lipase is coated with the trehalose to form the modified lipase, so that the modified lipase can keep efficient catalytic activity for a long time at a relatively high temperature, and further the water-soluble polysiloxane can be efficiently prepared through a lipase catalytic reaction one-step method. Compared with a traditional acid / alkali synthesis method, the preparation method of the water-soluble polysiloxane can obtain a higher conversion rate at a lower reaction temperature, meanwhile, an antioxidant does not need to be added, and the obtained water-soluble polysiloxane is good in water solubility, light transmittance and safety.

The invention relates to a plastic film (1) comprising at least one layer (2, 3). The at least one layer (2) consists essentially of ethylene-vinyl acetate (EVA), wherein the ethylene-vinyl acetate (EVA) has a vinyl acetate (VA) content of at least 15 wt.% to ensure a water vapor diffusion-equivalent air layer thickness (s d -value) of less than 15 m. At least one layer (2, 3) has a proportion of at least 5 wt% polylactic acid (PLA).

This application relates to water-soluble polysiloxanes, their preparation methods, and applications. The preparation method of water-soluble polysiloxanes includes: mixing lipase, trehalose, and a surfactant to prepare a modified lipase; and mixing vinyl acetate, alkoxysilane, monomethoxy polyethylene glycol, and the modified lipase to prepare the water-soluble polysiloxane. This preparation method utilizes trehalose to coat the lipase, forming a modified lipase that maintains high catalytic activity at higher temperatures for extended periods. This allows for the efficient one-step preparation of water-soluble polysiloxanes via lipase-catalyzed reactions. Compared to traditional acid / base synthesis methods, this method achieves higher conversion rates at lower reaction temperatures, eliminates the need for antioxidants, and yields water-soluble polysiloxanes with good water solubility, light transmittance, and safety.

The utility model discloses a novel antifouling film. The novel antifouling film comprises a rolled film body and an antifouling base layer, winding drums are inserted into the inner wall of the roll film body, spiral threads are formed in the left and right sides of the outer walls of the winding drums, and sleeves are installed on the left and right sides of the outer walls of the two winding drums through the spiral threads in a threaded mode. According to the utility model, the protective paper of the antifouling film is directly torn off for use by adopting a back adhesive technology instead of a back adhesive paper technology, the installation operation is convenient, and the oil-proof bonding layer is made of PVC (Polyvinyl Chloride) resin, so that the antifouling film is non-toxic and harmless, has excellent oil repellency and waterproofness and cannot permeate stains, thereby enhancing the waterproofness and moisture resistance of the film; by arranging the silicone oil and the oil-proof additive, the surface of the fireproof and oil-proof film is smoother and convenient to clean, and the adhesive is prepared from vinyl acetate, so that the fireproof and oil-proof film has good high-temperature resistance and chemical resistance, and the adhesion firmness and the adhesion covering rate between the fireproof and oil-proof film and a wall are enhanced; and therefore, the peeling phenomenon of the antifouling film is also prevented.

A multilayer permeation resistant article, such as a fuel transfer hose (100), includes an elastomeric layer (102) and a polyketone (PK) barrier layer (104). The elastomeric layer (102) may be directly bonded to the PK barrier layer (104) without an intervening adhesive layer. To facilitate such direct bonding, the elastomeric layer may be formed from a composition including one or more ethylene vinyl acetate elastomer(s). The elastomeric composition may include additional elastomer(s), such as chlorinated polyethylene (CPE), acrylonitrile butadiene rubber (NBR), hydrogenated nitrile rubber (HNBR), or chlorosulfonated polyethylene (CSM). The barrier layer may exhibit a permeation rate of less than 10 g / m2 / day. The bonding performance of the elastomeric layer to the PK barrier layer may be characterized by an average load per width of 10 Ibf / in or greater.

This invention belongs to the field of biochemical technology, specifically disclosing a 6′- O A whole-cell biosynthesis method for caffeoyl arbutin and its analogues includes the following steps: using aromatic carboxylic acids and vinyl acetates as substrates, performing a transvinylation reaction under palladium catalyst and base conditions to prepare aromatic vinyl esters; using the prepared aromatic vinyl esters as acyl donors, ... β Arbutin, using acyl acceptors, undergoes an aromatic acylation reaction in an organic solvent with whole cells of Aspergillus oryzae as a catalyst to yield the 6′- O Caffeoyl arbutin or its analogues. This invention develops a two-step whole-cell catalytic method for the efficient and sustainable synthesis of CA and its analogues. The synthesized compounds exhibit potent inhibitory activity against mushroom tyrosinase. This invention pioneers a novel green biosynthetic pathway for tyrosinase inhibitors, demonstrating significant application potential in the food preservation and cosmetics industries.

The present disclosure provides an aqueous composition comprising water and a polymer, the polymer comprises at least one hydrophobic monomer selected from the group consisting of n-hexyl (meth) acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, pentadecane (meth) acrylate, cetyl (meth) acrylate, oleyl (meth) acrylate, erucyl (meth) acrylate, vinyl acetate, vinyl propionate, and at least one of the following monomers. A vinyl versatate, a vinyl stearate, an allyl acetate, an allyl propionate, an allyl versatate, an allyl stearate, and combinations thereof; and at least one hydrophilic monomer selected from the group consisting of an acrylate, an acrylate, an acrylamide, a 2-acrylamido-2-methylpropanesulfonic acid, a 2-acrylamido-2-methylpropanesulfonic acid salt, and combinations thereof, wherein the composition exhibits a particle suspension time of at least 1 hour.

Provided are an active energy ray curable-type ink containing a resin-coated pigment in which a pigment is coated with a vinyl chloride-vinyl acetate copolymer resin and a polymerizable compound, in which the pigment is a magenta pigment which is PR146 and / or PR254 or a yellow pigment which is at least one of PY110, PY155, PY185, PY138, PY150, or Pigment Yellow184, a content mass ratio of the vinyl chloride-vinyl acetate copolymer resin with respect to the pigment is 0.25 to 4.00, and an Mp / D ratio, which is a ratio between a content Mp % by mass of the pigment with respect to a total amount of the ink and a specific gravity D of the pigment, is 2.00 or less; and applications thereof.

A seed or seedling is coated with underivatized guar, cationic hydroxypropyl guar, polyacrylamide, poly(methacrylic acid), poly(acrylic acid), polyacrylate, poly(ethylene glycol), polyethyleneoxide, poly(vinyl alcohol), polyglycerol, polytetrahydrofuran, polyamide, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, underivatized starch, cationic starch, corn starch, wheat starch, rice starch, potato starch, tapioca, waxy maize, sorghum, waxy sarghum, sago, dextrin, chitin, chitosan, xanthan gum, carageenan gum, gum karaya, gum arabic, pectin, cellulose, hydroxycellulose, hydroxyalkyl cellulose, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, or hydroxypropyl cellulose, the coated seed or seedling having a shelf-life at room temperature in ambient conditions in an unsealed container to at least two months.

To provide a method of preparing an ethylene vinyl acetate copolymer, as a solvent, using alkyl acetate, which has a low chain transfer constant and is easily separated from monomers in an ethylene vinyl acetate polymerization process and to provide a method of preparing an ethylene vinyl acetate copolymer that easily controls the molecular weight of the ethylene vinyl acetate copolymer and is applicable to ultra-high molecular weight ethylene vinyl acetate copolymer rubber.SOLUTION: There is provided a method of preparing ethylene vinyl acetate copolymer, comprising the step of adding a monomer comprising ethylene and vinyl acetate, and a solvent comprising alkyl acetate to a reactor and performing polymerization.SELECTED DRAWING: None

Integrations of carbon monoxide electrolyzers and chlor-alkali electrolyzers are disclosed herein. The disclosed integrations include novel process chains for the valorization of oxocarbons into hydrochloric acid, vinyl chloride, vinyl acetate, ethylene oxide, and other useful chemicals. The disclosed integrations further include novel ways to operate the electrolyzers in tandem to increase the efficiency of both reactors. This disclosure also includes novel ways to balance the operation of both electrolyzers to assure they are operating at an optimal level to take advantage of the benefits of the disclosed integrations.

Provided are an active energy ray curable-type ink containing a resin-coated pigment in which a pigment is coated with a vinyl chloride-vinyl acetate copolymer resin and a polymerizable compound, in which the pigment is a magenta pigment which is PR146 and / or PR254 or a yellow pigment which is at least one of PY110, PY155, PY185, PY138, PY150, or Pigment Yellow184, a content mass ratio of the vinyl chloride-vinyl acetate copolymer resin with respect to the pigment is 0.25 to 4.00, and an Mp / D ratio, which is a ratio between a content Mp% by mass of the pigment with respect to a total amount of the ink and a specific gravity D of the pigment, is 2.00 or less; and applications thereof.

The invention belongs to the field of rare earth separation, and particularly discloses a separation method of heavy rare earth ions. According to the separation method, a vinyl complexing agent comprising at least one of vinylphosphonic acid, vinylsulfonic acid, vinylacetic acid or 4-vinylbenzyl chloride is adopted to selectively complex heavy rare earth ions in a water phase, so that the partition coefficient among different heavy rare earth ions is obviously improved; and extracting and separating different heavy rare earth ions from the water phase of the complex containing the heavy rare earth ions and the organic phase containing the extracting agent to achieve the purpose of improving the separation efficiency.

Integrations of carbon monoxide electrolyzers and chlor-alkali electrolyzers are disclosed herein. The disclosed integrations include novel process chains for the valorization of oxocarbons into hydrochloric acid, vinyl chloride, vinyl acetate, ethylene oxide, and other useful chemicals. The disclosed integrations further include novel ways to operate the electrolyzers in tandem to increase the efficiency of both reactors. This disclosure also includes novel ways to balance the operation of both electrolyzers to assure they are operating at an optimal level to take advantage of the benefits of the disclosed integrations.