66 results about "Laurolactam" patented technology

A task often encountered in very recent times is the rapid provision of prototypes. Particularly suitable processes are those based on pulverulent materials and in which the desired structures are produced layer-by-layer through selective melting and solidification. The invention provides the constitution, production and use of a copolyamide powder which was produced using the following monomer units: a) laurolactam or ω-aminoundecanoic acid, and also b) dodecanedioic acid, and either c) decanediamine or dodecanediamine, in shaping processes, and also to mouldings produced through a layer-by-layer process which selectively melts regions of a powder layer, using this specific powder. Once the regions previously melted layer-by-layer have been cooled and solidified, the moulding can be removed from the powder bed. The mouldless layer-by-layer processes for the production of components using the copolyamide powder result in simplified and more reliable conduct of the process and better recyclability.

A polyamide moulding composition with the following constitution is described:

• (a) from 40 to 90% by weight of a copolyamide, where this is composed of
• (a1) 1,6-hexanediamine and 1,10-decanediamine and also
• (a2) terephthalic acid and at least one other polyamide-forming monomer selected from the group of: dicarboxylic acid having from 8 to 18 carbon atoms, laurolactam, aminolauric acid, and/or mixtures thereof;
• (b) from 10 to 40% by weight of macromolecular plasticizers, with the proviso that these can have been replaced to some extent by low-molecular-weight plasticizers;
• (c) from 0 to 20% by weight of additives and/or added substances.

Uses of this type of moulding composition are also described, in particular for the production of a fuel line, cooling line, oil line or urea line for the automobile sector, as also are production processes to give mouldings.

The invention discloses a polyamide thermosol, containing the following copolymer monomers: A. one or many kinds of hexanolactam, amino-caproic acid, 11-aminoundeeanic acid and laurolactam; B. one or many kinds of mixtures formed of C4-C9 aliphatic dicarboxylic acid and equivalent C2-C12 aliphatic diamine or their nylon salts; C. one or many kinds of mixtures formed of C10-C15 long-carbon chain aliphatic dicarboxylic acid and equivalent C4-C12 diamine or vinyl-amine or their nylon salts. It has high melting point, narrow fusing temperature range, high bonding strength, good low-temperature flexibility and high-temperature resistance, and can be applied to binding metal material, metal-plastic laminated composite, and car light.

This invention provides a process for producing a new type of organic montmorillonite reinforced nylon, comprising the steps of: swelling the montmorillonite with a polar solvent, then adding an organic solution of the interlayer insertion agent, ªÏ-laurolactam, to obtain organic montmorillonite; adding the organic montmorillonite into hexanolactam and stirring the mixture at 100-120 deg.C for 4-8h under nitrogen atmosphere; vacuum pumping at a vacuum degree of 99331-99997Pa for 15-60min, then adding sodium hexanolactam, 2,4-toluene diisocyanate and other assistants to the mixture for casting or reactive extrusion to obtain the product. The process of this invention produces an interlayer insertion agent that can improve the adhesion between the montmorillonite and the nylon matrix, and the montmorillonite/nylon nanocomposite produced from the interlayer insertion agent treated montmorillonite has high strength, modulus, resistance, impact strength and rupture extension rate.

A good layer adhesion can be achieved in a composite having two or more layers wherein a layer I is obtained from a molding composition which has the following components: a) from 0 to 80 parts by weight of a polyamide selected from the group consisting of PA6, PA66, PA6/66 and a mixture thereof; b) from 0 to 100 parts by weight of a polyamine-polyamide copolymer; and c) from 0 to 80 parts by weight of a polyamide selected from the group consisting of PA11, PA12, PA612, PA1012, PA1212 and a mixture thereof; wherein a total of the parts by weight of components a), b) and c) is 100; wherein at least 20 parts by weight of components a) and b) is a monomer unit which is obtained from caprolactam and/or from a combination of hexamethylenediamine/adipic acid; and wherein at least 20 parts by weight of components b) and c) is a monomer unit which is obtained from omega-aminoundecanoic acid, laurolactam, a mixture of hexamethylenediamine and 1,12-dodecanedioic acid, a mixture of 1,10-decanediamine and 1,12-dodecanedioic acid, and/or a mixture of 1,12-dodecanediamine and 1,12-dodecanedioic acid.

The invention relates to a polyamide molding material or copolyamide molding material and the use of such a polyamide molding material or copolyamide molding material for producing steam-sterilizable transparent moldings and extrudates. This polyamide molding material is characterized in that it comprises at least one copolyamide formed from 35-42 mol% of bis(4-amino-3-methylcyclohexyl)methane (MACM), 35-42 mol% of isophthalic acid (IPS) and 16-30 mol% of laurolactam (LC12). MACM may be replaced up to 50% by bis(4-aminocyclohexyl)-methane (PACM) and IPA up to 50% by terephthalic acid (TPA). The polyamide molding material may also be a blend of copolyamides or a blend of copolyamides with polyamide 12. The relative viscosity (RV) of the polyamide molding material or copolyamide molding material is in any case adjusted to a value which is greater than 1.45. Steam-sterilizable and transparent standard specimens which are produced from such polyamide molding materials or copolyamide molding materials and whose composition corresponds to the transparent moldings and extrudates have a tensile strain at break which, after undergoing at least 140 and especially preferably at least 350 steam sterilization cycles, is above the stretching limit.

The present invention provides a method for purifying laurolactam from a crude lactam mixture. In the method of the present invention, laurolactam is selectively crystallized by melt crystallization with controlled cooling of the crude lactam mixture.

The invention discloses a modified cast nylon with good comprehensive performance, and provides a simple and feasible method for preparing the modified cast nylon. The invention is made of caprolactam, laurolactam, nano rare earth, sodium hydroxide, toluene isocyanate or polyisocyanate; the method is to add nano rare earth after heating caprolactam and laurolactam, and stir evenly; vacuumize and dehydrate; add After the catalyst is stirred evenly, it is poured into the mold, and after the polymerization reaction, it is solidified into a solid billet. The cast nylon prepared by the invention has high density, tensile strength, toughness and wear resistance, low water absorption and small wear coefficient.

Flame-retardant polyamide molding material for sheathing optical waveguides/cables, includes:

• (A) 40-71 wt.-% copolyamide MACMI/12;
• (B) 20-51 wt.-% of at least one aliphatic polyamide;
• (C) 6-2 0wt.-% melamine cyanurate;
• (D) 3-10 wt.-% aryl phosphate; and
• (E) 0-6 wt.-% further additives.

Components total 100 wt.-% of polyamide molding material. Copolyamide a MACMI/12 has laurin lactam content of 23-45 mol-% in relation to molar sum of monomers MACM, isophthalic acid, and laurin lactam of this copolyamide. Isophthalic acid in copolyamide MACMI/12 can be entirely/partially replaced by terephthalic acid. Test specimen produced from this polyamide molding material has Shore hardness D of at least 77, and buckling test using PA12 extrudate coated with this molding material is passed upon winding around metal rod having 12mm diameter. PA12 extrudate for buckling test has diameter of 1.5mm and coating 0.7 mm thick. Optical waveguides/cables sheaths made of this polyamide molding material have bite-inhibiting effect in relation to rodents.

Provided is a process for efficiently producing laurolactam by simple steps from cyclododecanone and hydroxylamine. This production process comprises the steps of: (a) reacting cyclododecanone with hydroxylamine in an aqueous solution in the presence of an oxime-formation solvent to produce cyclododecanone oxime; (b) separating the reaction mixture obtained after the oxime-forming step into an oil and an aqueous phases and collecting a solution of cyclododecanone oxime of the oil phase; (c) removing a part or all of the oxime-formation solvent and dissolved water from the solution of cyclododecanone oxime which is collected as an oil phase in the oil/aqueous phase separation step, whereby preparing a solution containing a rearrangement solvent to be used in a rearrangement reaction in a later step and the cyclododecanone oxime; (d) producing laurolactam from cyclododecanone oxime by rearrangement reaction using an aromatic-ring containing compound as a rearrangement catalyst; and (e) separating and removing the rearrangement solvent and the rearrangement catalyst from the reaction mixture after the rearrangement step, and purifying the laurolactam.

The present invention relates to processes for the production of lactams such as e-Caprolactam, w-Laurolactam, or of carboxylic acid amides such as acetaminophenol and benzanilide by Beckman rearrangement from the corresponding oximes in the presence of Nb-impregnated catalysts, such as Nb on SiO2, preferably in the gaseous phase but also in the liquid phase. The reactions in the gaseous phase can be performed in various reactors, such as fixed bed reactors, plate reactors, fluidized bed reactors, fluidized bed reactors having continuous regeneration in a second fluidized bed at temperatures between 200 DEG C and 500 DEG C and a pressure of 0.01 bar to 10 bar. In the liquid phase, the reactions can take place in different reactors such as autoclaves, stirred reactors, loop reactors, and trickle bed reactors at temperatures from 20 DEG C to 200 DEG C and a pressure between 0.5 and 20 bar. The invention further relates to the method of regeneration of said Nb-containing catalysts in oxidizing and non-oxidizing media at 200 DEG C to 600 DEG C.

The invention relates to hyaluronic acid freeze-dried microcapsule powder and a preparation method and application thereof. The hyaluronic acid freeze-dried microcapsule powder is prepared from the following raw material ingredients in parts by weight: 5 to 7 parts of micro-molecule hyaluronic acid, 130 to 170 parts of gulcomannan, 90 to 110 parts of poly-laurolactam and 3800 to 4200 parts of water. According to the hyaluronic acid freeze-dried microcapsule powder disclosed by the invention, micro-molecule hyaluronic acid with a molecular weight range of being less than50kDa is shrunk into microballoon through a freeze-drying technology, so that skin seepage force is greatly improved; when being applied to lip nursing products, the hyaluronic acid freeze-dried microcapsule powder can enter lip skin; volume can expand when meeting water to soften skin and smooth wrinkles, so that an effect of plumping lip is achieved.

A process for purifying laurolactam by means of integrated connection of distillation and crystallization is provided. The crystallization is performed as a solution or melt crystallization. The process reduces thermal stress applied to the laurolactam stream and improved yields are obtained. Raw materials are recovered and recycled in the production sequence.

The invention provides a method for hydrolysis polymerization of laurolactam. According to the invention, through multistage-series operation, smooth transition of a high-pressure hydrolysis stage and a pressure-reducing condensation polymerization stage and highly-efficient production are realized, and the conversion rate of a laurolactam monomer is 99.9% or above; meanwhile, the process has high flexibility, can realize addition and uniform dispersion of an additive and/or a copolymerization monomer in all stages of a reaction according to needs of a product, and prepares polydodecalactam modified resin.

The invention discloses a method for preparing a nano silicon dioxide composite material, which belongs to the field of material preparation. It is characterized in that it comprises the following steps: adding RNS-A and methyl acrylate in a flask, using methanol as a solvent, washing with methanol after magnetic stirring reaction and filtering, and obtaining half-generation SiO2 dendrimers after drying; in the flask Add half-generation SiO2 and ethylenediamine, and use methanol as a solvent for magnetic stirring reaction to synthesize SiO2 dendrimers; mix laurolactam, dendritic SiO2, water and phosphoric acid into the polymerization kettle, and replace the air in the kettle with carbon dioxide. Raise the temperature and increase the pressure, then react and pressurize under normal pressure, and then discharge the material. After the material is cooled by water, it is cut into pellets to obtain a nano-SiO2 composite material. Through the improvement of the original preparation process, the amine-type dendritic macromolecule is prepared by repeating the Michael addition reaction of amine groups and methyl acrylate. The preparation method of the nano-silica composite material described in this method is simple and easy. operation, has great promotion and application value.

Polymers can be prepared from monomers comprising laurolactam, by a process including a. Beckmann rearrangement of cyclododecanone oxime to give laurolactam in the presence of a Beckmann rearrangementcatalyst, b. removal of impurities from the laurolactam to obtain purified laurolactam, and c. polymerization of monomers comprising purified laurolactam. For avoidance of discoloration or yellowingunder ageing conditions, prior to the polymerization, polycyclic substances containing 24 carbon atoms and at least one heteroatom selected from oxygen and nitrogen and having a molar mass between 300and 380 g/mol are limited to 500 ppm, based on laurolactam.

The invention discloses a catalyst and a preparation method thereof, and a method for preparing laurolactam through a gas phase rearrangement reaction. The catalyst comprises fluoride modified rare earth doped Al2O3-SiO2-ZrO2 and fluorine-containing sulfonated polyetheretherketone, and the loading capacity of the fluorine-containing sulfonated polyetheretherketone in the catalyst is 20-50wt%, preferably 30-45wt%. When the catalyst is used for catalyzing gas-phase rearrangement of cyclododecanone oxime, the conversion rate of cyclododecanone oxime reaches 99% or above, the selectivity of laurolactam reaches 99.5% or above, the service life of the catalyst reaches 3000h or above, no ammonium sulfate byproduct is produced in the reaction, the mechanical strength of the catalyst is high, and the problems of equipment corrosion and environmental pollution of a traditional liquid-phase rearrangement process are solved.