35results about How to "Low CMC value" patented technology

The invention relates to a bacterium S2 for efficiently generating biosurfactant and a fermentation culture medium thereof, belonging to the field of biotechnology. The bacterium S2 is gram-negative bacterium which is rod-shaped, is (6-8)*(8-12) micrometers in size and has no spores and capsules. The bacterial strain belongs to the pseudomonas aeruginosa through identifying by morphological and physio-biochemical characteristics and molecular biology, and the collection code is CGMCC No.3034. The best fermentation culture medium is a novel culture medium which takes 50g/L of rapeseed oil as the only carbon source. The rhamnolipid is the only fermentation product of the bacterial strain and has high yield. The CMC (Critical Micelle Concentration) value of the fermentation liquid is 0.25 g/L; compared with the common chemical surfactant, the bacterium has more obvious emulsification and durability on hydrophobic substances, such as oils and the like.

The invention discloses a leveling and deepening fixing agent and a preparation method thereof. The leather leveling and deepening fixing agent is a dyeing assistant with the functions of leveling, deepening and fixing colors, and an assistant molecule comprises the groups of -NR2, -NH2, -NHR, -COONa, and the like and is a compound with an amphoteric structure. Under an alkaline condition, the molecule carries negative charge and has a leveling function for dyeing acid dye, the auxochromic groups of -NR2, -NH2, -NHR, and the like on the assistant molecule act on the dye to deepen the color andplay a deepening function. Under an acidic condition, the groups of -NR2, -NH2, -NHR, and the like have positive charge and play a fixing function for the acid dye. The assistant is a multifunctionalproduct, can play the functions of leveling, deepening and fixing colors for dying leather and can simplify a leather preparing technology.

The invention relates to a pesticide adjuvant, in particular to a wetting agent for pesticide preparations, a method for preparing the wetting agent and application of the wetting agent to the pesticide preparations. The method for preparing the wetting agent for the pesticide preparations includes steps of adding salicylic acid and potassium hydroxide into a reactor, then adding triethylene tetramine into the reactor drop by drop to obtain intermediate monoamide, adding dehydroabietic acid into the reactor and carrying out a series of reaction to obtain intermediate asymmetric bisamides; adding the intermediate asymmetric bisamides and butanone into the reactor, adding propane suhone into the reactor drop by drop, carrying out suction filtration, repeatedly washing substances in the reactor by the aid of butanone, re-crystallizing the substances, neutralizing the substances by the aid of ethanol solution of alkali, separating white solid from the substances, carrying out suction filtration and drying the white solid under the vacuum condition to obtain the wetting agent for the pesticide preparations. The wetting agent, the method and the application have the advantages that the wetting agent for the pesticide preparations is of an asymmetric structure with the bisamides and bis-sulfonate and is excellent in surface activity, compound property and wetting property, and the pesticide absorption rate can be increased.

The invention relates to a novel dimeric cationic surfactant. The structural formula of the surfactant is indicated as formula (A). The dimeric cationic surfactant introduces groups at a polar head to reach chemical bonding, restrain separating force among the original single-chain single heads and improve appetency among carbon chains, thereby improving surface activity and opening a brand new pathway for practical application. The surfactant has good water solubility. Compared with the general single-head surfactant, the surfactant has low surface tension and a cmc value and is a novel surfactant with a wide application prospect. As shown in the specification, wherein, n=18, 16, 14 or 12.

The invention discloses styrene-acrylate copolymer seed emulsion. The emulsion is prepared from styrene serving as a monomer component, methyl methacrylate and butyl acrylate with the existence of reaction type emulsifier, non- reaction type emulsifier and water. The invention further provides a method for preparing the emulsion for stonelike paint from a monomer mixture composed of acrylic acid (AA), methacrylic acid (MAA), butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid 2- ethylhexyl acrylate (EHA) and crosslinking monomer with the existence of the seed emulsion. The invention further provides the stonelike paint containing colored sand and the emulsion.

The invention relates to a 1,1'-dialkyl-3,3'-(2-phosphate-1,3-propylidene)imidazolium compound and a preparation method thereof. The structural formula of the 1,1'-dialkyl-3,3'-(2-phosphate-1,3-propylidene)imidazolium compound is shown in the specification, wherein n is 6, 8, 10, 12 and 14, and the alkyl imidazole can be replaced with alkyl benzimidazole. The 1,1'-dialkyl-3,3'-(2-phosphate-1,3-propylidene)imidazolium is a amphoteric dimeric surfactant, and a concrete synthesis method comprises the following steps: synthesizing 1, 3-dichloro-2-propanol, synthesizing N-alkyl imidazole, synthesizing 1,1'-dialkyl-3,3'-(2-hydroxyl-1,3-propylidene)imidazole hydrochloride, and synthesizing 1,1'-dialkyl-3,3'-(2-phosphate-1,3-propylidene)imidazolium. The 1,1'-dialkyl-3,3'-(2-phosphate-1,3-propylidene)imidazolium compound and the preparation method are easily available in raw materials, the reaction technology conditions are easy to control, operation is simple, the product is easy to purify, and yield is high. The compound has low critical micelle concentration, and can be used as a wetting agent, an emulsifier, a foaming agent and a foam stabilizer. A molecular structure has macrocyclic cefpimizole group and phosphate ester, and thus the compound has good thermal stability, solubility, salinity resistance, temperature resistance and acid and base resistance.

The invention relates to a preparation method of urushiol-loading pH responsive amphiphilic copolymer micelle. The preparation method comprises the following steps: firstly, dissolving a certain amount of mPEG, hydrophobic amine monomer, 5-amino-1-pentanol and 1,4-butanediol diacrylate in DMSO to prepare a reaction solution with a certain concentration, performing polyreaction for 20-48h, then adding a certain amount of 1,3-pentanediamine, and continuing the reaction for 24h to synthesize polyethylene glycol-poly-beta-amino ester amphiphilic copolymer (mPEG-PBAE); and then taking and dissolving a certain amount of mPEG-PBAE and urushiol in DMF, performing uniform ultrasonic mixing, and performing dialyzing, centrifuging and filtering to obtain the urushiol-loading pH responsive amphiphiliccopolymer micelle. The drug-loading micelle has an average particle diameter of 140-160nm, good stability, obvious pH responsive drug-release property, good biocompatibility, and good targeting anti-tumor activity, can be applied to clinical targeting anti-tumor drugs, has very high added value, and can become a new technique for clinically developing urushiol targeting anti-tumor drugs.

The invention discloses a nano silver transparent amino acid handmade soap and a preparation method thereof. The handmade soap comprises following raw materials in percentage by weight: 30 to 42% of amino acid, 20 to 30% of a saponifying agent, 5 to 18% of ethanol, 15 to 25% of water, 1 to 10% of a hardness adjuster, 1 to 5% of a transparency adjuster, 1 to 4% of a nano silver water solution, and0.5 to 2% of a composite moistening agent. The provided nano silver transparent amino acid handmade soap has the advantages of glittering and translucent appearance, large hardness, washing resistance, weakly acidic property, mild property, and abundant and fine foams, can kill and prevent bacteria, and has the functions of moistening and whitening skin, preventing wrinkles, enhancing the protection and isolation performance of skin, preventing allergy, and repairing skin.

The invention discloses an activator for a fabric, i.e., an asymmetric dimeric surfactant, and preparation process thereof. The asymmetric dimeric surfactant is asymmetric bis(amidosulfonic acid)phosphate and has a structural formula as described in the specification; and in the formula, R is phosphate and M is Na or K.

The invention discloses a high-efficiency environment-friendly penetrant for fabric pretreatment (asymmetric Gemini surfactant) and a preparation method thereof. The asymmetric Gemini surfactant is particularly an asymmetric bisamide sulfonate phosphate of which the structural formula is disclosed in the specification, wherein R is phosphate, and M is Na or K.

The invention discloses a preparation method for a Si-C-Si type anionic organosilicon surfactant. The preparation method comprises the following steps: (1) performing a Grignard reaction: under the protection of N2, preparing a Grignard reagent by using chloromethylsilane; and under the protection of N2, adding vinyl alkoxysilane or vinyl chlorosilane into a four-necked flask containing anhydroustetrahydrofuran or anhydrous ether, and adding chloromethylsilane or a methyl Grignard reagent dropwise to synthesize vinyl carbosilane; and (2) performing a thiol-ene reaction: putting the product vinyl carbosilane obtained in the step (1) into a three-necked flask, adding a thiol compound, a solvent and a catalyst, performing the thiol-ene reaction for 0.5-4 h, performing extraction by using water-dichloromethane, drying the obtained solid for 24 h at pressure of 0.1 MPa and temperature of 40 DEG C, and performing cooling to obtain the Si-C-Si type anionic organosilicon surfactant. Accordingto the method disclosed by the invention, the surfactant prepared by the method has excellent surface activity and can be used in the fields of drug slow release, functional nano materials, textile processing auxiliary agents and the like.

The invention relates to a preparation method of mesoporous hollow carbon microspheres with an internal communication structure in the technical field of porous carbon nanomaterials, which sequentially comprises the following steps: adding 3-aminophenol and a gemini cationic Gemini surfactant into a mixed solution of water and ethanol, and magnetically stirring and dissolving the mixed solution ina water bath at 20-30 DEG C; adding concentrated ammonia water into the dissolved mixed solution, uniformly mixing the concentrated ammonia water and the dissolved mixed solution, adding formaldehyde, adding tetraethyl orthosilicate when milk white turbid substances exist, and continuing to react for 20-24 hours in a water bath of 20-30 DEG C; transferring the reactant into a reaction kettle, carrying out a constant-temperature hydrothermal reaction at 90-120 DEG C for 20-24 hours, naturally cooling, sequentially washing the cooled reactant with distilled water and absolute ethyl alcohol, andcarrying out freeze drying for 36 hours to obtain a powdery product; and 4, calcining the powdery product obtained in the previous step in a nitrogen atmosphere, and etching, washing and drying the calcined black solid to obtain the mesoporous hollow carbon microsphere with the internal communication structure.

The invention relates to a washing product and a preparation method thereof. The washing product comprises the following components in percentage by mass: 10-20% of surfactant, 0.2-5% of orange peel extracting solution and the balance of water, wherein the orange peel extracting solution contains a Dlimonene component. The washing product is high in cleaning capacity, small in irritation to skin and clothes and environmentally friendly.

The invention discloses low-water-absorptivity stone-like coating emulsion and a preparation method thereof, and belongs to the technical field of building coatings. The low-water-absorptivity stone-like coating emulsion is prepared from the following raw materials in parts by weight: 20 to 50 parts of methyl methacrylate, 5 to 20 parts of styrene, 20 to 40 parts of ethylhexyl acrylate, 2 to 5 parts of a functional monomer, 2 to 5 parts of a crosslinking monomer, 2 to 4 parts of an emulsifier, 1 to 3 parts of persulfate and 100 parts of water. The functional monomer is itaconic acid; the crosslinking monomer is at least one of glycidyl methacrylate and allyl methacrylate; the emulsifier is at least one of sodium dodecyl benzene sulfonate and ammonium fatty alcohol epoxy ester sulfate. The low-water-absorptivity stone-like coating emulsion disclosed by the invention has the characteristics of low water absorptivity, water white resistance and high hardness.

The invention relates to a star-shaped amphiphilic redox response type polymer and a preparation method and application thereof. The polymer has a molecular structure shown in the formula (I), whereinX is 15-45, Y is 5-15 and m is 15-67. The polymer disclosed by the invention takes pentaerythritol as a core, poly(lactic acid-co-glycolic acid) as a hydrophobic segment, methoxypolyethylene glycol as a hydrophilic segment and disulfide bonds on a main chain as oxidation-reduction response functional groups to be used for preparation of low-toxicity and stable star-shaped oxidation-reduction response type polymer micelles, and meanwhile the star-shaped oxidation-reduction response type polymer micelles have a good drug loading rate, a good encapsulation rate and good drug release performancesin a specific environment. Due to the fact that pentaerythritol is low in price and relatively small in steric hindrance, the reaction of each step is easier to carry out, good yield is achieved, andlarge-scale production can be achieved.

The invention relates to the technical field of building materials, and particularly discloses anti-freezing concrete and a preparation method thereof. The anti-freezing concrete comprises the following raw materials in parts by weight: 150-180 parts of water; 340 to 400 parts of a cementing material; 550 to 650 parts of fine aggregate; 1200 to 1400 parts of coarse aggregate; 2-4 parts of a water reducing agent; 0.01 to 0.03 part of an air entraining agent; the air entraining agent is prepared by heating, cooling and concentrating raw materials including an initiator, a catalyst, ethylene oxide, phosphoric acid and o-xylene. The method has the advantage of improving the frost resistance of the concrete.

The invention discloses a four-arm star-shaped polymer and a preparation method thereof. The polymer has a structure as shown in formula (I) which is described in the specification. In the formula (I), m is in a range of 40 to 150, and n is in a range of 100 to 200. The polymer is prepared through an ATRP reaction of a compound 1 with N-isopropylacrylamide, and the conversion rate of the raw materials during the reaction is improved. The four-arm star-shaped polymer of the invention has a low CMC value in an aqueous solution through the controlling of the polymerization degree of MMA and NIPAmin a block copolymer, indicating that a micelle formed by the four-arm star-shaped polymer has good stability.

The invention belongs to the field of daily chemicals. A composition containing strip-like crystals comprises the following components (by weight): 14-37% of an anionic surfactant, 4-10% of a crystalline ethylene glycol dialkyl acid ester compound, 4-10% of a polyol compound, 0.1-2% of a cationic guar gum derivative and the balance water. The composition of the invention has the ability of formingstrip-like crystals in an efficient and directional way. The formation of strip-like crystals enables the composition to have good stability, suspension capacity and higher melting point, and can effectively avoid the problem of suspension capacity decline caused by high-temperature ring-breaking structure and external force shearing. The composition of the invention can be used as a silicone oilsuspending agent in a system containing silicone oil, is simple and convenient to use, and can be pre-produced and stored for a long time.