- Preparation and characterization of antibacterial films based on polyvinyl alcohol/quaternized cellulose
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Quaternized cellulose (YM) was homogeneously synthesized by grafting 3-chloro-2-hydroxypropyldodecyldimethylammonium groups onto cellulose molecules in a NaOH/urea aqueous solution. YM was blended with a poly(vinyl alcohol) (PVA) matrix to prepare composite films via co-regeneration from the alkaline solution. The PVA film and the blend films were characterized by Fourier transform infrared spectroscopy, X-ray diffraction measurements, thermogravimetric analysis, and scanning electron microscopy. Mechanical properties, water vapor barrier properties, light transmission, and antibacterial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria were also evaluated. The results reveal that PVA and YM in the composite films interacted by hydrogen bonding. Compared with pure PVA film, the PVA/YM blend films had higher tensile strength, higher thermostability, lower water permeability, and especially, higher antibacterial activity. The blend films exhibited good UV-shielding performance. Our study demonstrates a simple and efficient method for preparing a functional, environment-friendly composite film.
- Hu, Dongying,Wang, Lijuan
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- A convenient synthesis of quaternary ammonium gemini surfactants from long-chain alkyldimethylamines and epichlorohydrin
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Aqueous micellar systems proved to be an excellent reaction medium for the selective synthesis of bis-quaternary ammonium salts 5a-c from epichlorohydrin 2 and long-chain alkyldimethylamines 1a-c, in the presence of the corresponding amine chlorohydrates
- Ricci,Cabrera,Luna,Grau
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- CATIONIC LATEX EMULSION INCLUDING DIQUATERNARY AMMONIUM SURFACTANT
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Various aspects of the present invention relate to cationic latex emulsions, methods of making the same, various materials including the cationic latex emulsion such as asphalt emulsions, and methods of making the asphalt emulsions. A cationic latex emulsion includes latex particles. The cationic latex emulsion includes an aqueous liquid emulsified with the latex particles. The cationic latex emulsion also includes a cationic surfactant that is a diquaternary ammonium surfactant.
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Paragraph 000103-000104; 000107-000110
(2021/08/13)
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- Preparation method of biquaternary ammonium salt intermediate (by machine translation)
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The double-quaternary ammonium salt intermediate is prepared by reacting 1, 3 -dichloropropanol and long-carbon-chain dimethylamine in acetone. By adopting 1 and 3 - dichloropropanol as the connecting group, the production chain of 1 and 3 - dichloropropanol is expanded, and the production chain and the application of the production chain and the 1 3 -dichloropropanol are expanded; the produced double quaternary ammonium salt intermediate is high in purity and easy to separate. (by machine translation)
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Paragraph 0014-0031
(2020/11/22)
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- Double electron type polymerizable surfactant monomer, and preparation method and applications thereof
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The invention discloses a double electron type polymerizable surfactant monomer. A preparation method comprises following steps: 1, epoxy chloropropane and a long chain tertiary amine are subjected toring-opening reaction in a hydrochloric acid solution so as to obtain an intermediate EPT; 2, EPT and N-dimethyl aminopropyl methacrylamide are subjected to quaterisation so as to obtain a finial product. The double electron type polymerizable surfactant monomer, acrylamide, acrylic acid, and 2-acrylamido-2-methylpropane sulfonic acid are subjected to polymerization, drying, crushing, and sievingat room temperature so as to obtain a polymer thickening agent powder; the polymer thickening agent powder is prepared into a 0.3wt% solution which is taken as a fracturing fluid. The preparation method is friendly to the environment; cost is low; yield and purity are relatively high; the hydrophobic associated polymer solution based on the monomer possesses excellent viscoelasticity and temperature resistance and salt resistance, so that the fracturing liquid prepared from the monomer is capable of solving technical problems in the prior art that conventional hydrophobic associated polymer fracturing liquid cost is high, and sand suspension capacity is poor.
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Paragraph 0029; 0030
(2019/07/04)
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- Phenylenediamine type positive ion asphalt emulsifier and preparation method thereof
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The invention discloses a phenylenediamine type positive ion asphalt emulsifier and a preparation method thereof. The structural formula of the emulsifier is shown as a general formula (I), wherein nis equal to 12, 16 or 18. The emulsifier does not need acid adjustment in practical application, the cost is saved, the pollution is reduced, the addition of a coagulant or retarder is not needed whenemulsified asphalt is prepared, and the emulsifier is more convenient to use.
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Paragraph 0035; 0037
(2018/07/06)
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- Guanidyl long chain gemini quaternary ammonium salt and preparation method thereof
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The invention discloses a guanidyl long chain gemini quaternary ammonium salt and a preparation method thereof, wherein long chain gemini quaternary ammonium salts and long chain alkyl tertiary amines are added into a solvent, are added with epichlorohydrin drop by drop in 40-90 DEG C, and obtain intermediate products by reacting after being added drop by drop; and the intermediate products are added into alcohol, are added with long chain guanidine drop by drop in 30-110 DEG C after being uniformly stirred, and react for 4-48h after being added drop by drop to obtain guanidyl long chain gemini quaternary ammonium salts. The guanidyl long chain gemini quaternary ammonium salt and the preparation method thereof adopt open loops of epoxide and bimolecular nucleophilic reactions, wherein H+ and epoxy groups are easy to combine in an open ring reaction of the epoxide, and enable tertiary amines which are used as nucleophilic reagents to be more rapid when attacking carbonium ions. Quaternary ammonium surfactants are in a system in a second reaction, are used as a surface active agent to greatly promote quaternization, and improve reaction speed as a whole. The guanidyl long chain gemini quaternary ammonium salt and the preparation method thereof are simple in reaction process, clear in target products, less in accessory substances and concise in purification process, and further reduces cost.
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Paragraph 0032; 0033; 0034
(2016/10/08)
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- Method of making emulsion containing quaternary ammonium functional silanes and siloxanes
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Oil-in-water (O/W) and water-in-oil (W/O) emulsions and microemulsions containing silanes or siloxanes having quaternary ammonium groups are made by reacting organic quaternary ammonium compounds having epoxide groups or halohydrin groups, with silanes or siloxanes having amino groups. The reaction is carried out in an aqueous polar phase containing a surfactant. The emulsions and microemulsions are especially useful for treating hair, skin, or the underarm.
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- Preparation of bis-quaternary ammonium salts from epichlorohydrin
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A novel bis-quaternary ammonium salt was prepared conveniently and almost quantitatively from N,N-dimethyldodecylamine, its hydrochloride, and epichlorohydrin. Reaction of N,N-dimethyldodecylamine with epichlorohydrin (in the presence of the amine hydrochloride) or various dichloro compounds was investigated by using 1H nuclear magnetic resonance. The reaction route was studied by examining the reactivity of reagents with the amine and the effect of reaction temperature. The ease of the reaction with epichlorohydrin was found to be due to the assistance of amine hydrochloride in opening the epoxide ring and to neighboring-group participation by the hydroxyl group of the intermediate mono-ammonium salt in the quaternization step. Neighboring-group participation by the hydroxyl group in these quaternization reactions is also discussed.
- Kim, Tae-Seong,Hirao, Toshikazu,Ikeda, Isao
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