48results about How to "No cross-linking reaction" patented technology

The invention discloses a polypropylene foaming material. The polypropylene foaming material comprises the following components according to proportioning by weight: 60-99 parts of polypropylene resin; 0.1-10 parts of nucleating agent; 0.1-5 parts of antioxidant; 0-5 parts of colorant; 0-5 parts of lubricant; and 0-20 parts of filling material; and the melt index of the polypropylene resin is 0.1-20 g/10 min, and the foaming process adopts supercritical fluid as the foaming agent, i.e. 0.1-20 parts of supercritical fluid (proportioning by weight). The invention also discloses a production method of the foaming material. Compared with the prior art, the invention has the advantages that the universal polypropylene can be adopted as a base material, no polymer is provided, the cross-linking reaction does not occur, the foaming process is free from environmental pollution, and the production method is safe; the quality of the obtained foaming material is stable, the foaming percentage and the cell density are high, the distribution is uniform, and the invention is suitable for the industrial production at a large scale; and meanwhile, the overall production method is simple, the operation is easy, and the production cost is relatively lower.

The invention provides a preparation method for hard hollow capsules from enteric plant cellulose derivatives and belongs to the technical field of pharmaceutic adjuvants. Plant cellulose is prepared from plant derivatives such as pine, purified cotton and the like. Colorless and transparent hard hollow capsules, colored hard hollow capsules, shading hard hollow capsules and the like can be prepared though the preparation method. The preparation method comprises steps of mixing of plant cellulose, surfactants, coagulant aids, coloring agents and water, molding, drying, coating and the like. The plant cellulose hard hollow capsules are advantaged by stable performances, low water content, environmental protection and safety. The plant cellulose hard hollow capsules can be filled by all kinds of contents.

The present invention discloses a blast bead sugar and a preparation method thereof. The blast bead sugar comprises a wrapping layer and a sandwich. A cavity is formed inside the wrapping layer; and the sandwich fills the cavity. The preparation method of the blast bead sugar comprises the steps of sandwich solution preparation, wrapping layer preparation, mold pouring and shaping and drying. Theblast bead sugar has a characteristic of blasting and is more interesting when being consumed, the sandwich components are nutritional and healthy, and the wrapping layer uses plant-derived materialsin a breakthrough manner and is safer. Besides, the blast bead sugar is unique in mouthfeel, and the wrapping layer is not liable to crack and strong in stability.

A hypromellose enteric empty capsule gelated by gellan gum and potassium chloride belongs to technical field of empty capsule production, is characterized in that hypromellose is used as a main raw material and mixed with the gellan gum and potassium chloride to prepare the empty capsule, and has the benefits that the disintegration is timely, moisture content is low, the empty capsule is suitable for medicines which have strong hygroscopicity and are sensitive to water, the influence of dissolved mediums on a capsule shell is small, the medication compliance is high, the storage period is long, the empty capsule can not go bad within 3-4 years, requirements on storage and transportation conditions are low, the empty capsule is less susceptible to fragmentation at a low-moisture environment, is insusceptible to deformation at a high-temperature environment, and has low probabilities of rottenness and deterioration; the empty capsule is made from pure vegetable fibers, and can meet requirements of all cultural backgrounds and religious groups; the manufacturing process is almost free from pollution, tailings can be again dissolved for reuse; frequently-used surface-active agents and plasticizers are eliminated, the gelating speed is accelerated only by using the potassium chloride to help the gellan gum to condense so as to reduce the gelating temperature, accordingly, the additives are reduced, and the production cost is reduced; the empty capsule is suitable for mass promotion.

The invention discloses a hydroxypropyl methylcellulose hollow capsule and a production process thereof. The glue solution of the hollow capsule is prepared from the following components: 120.0g of hydroxypropyl methylcellulose HPMC, 3.5g of carrageenan, 10.0g of titanium dioxide mother liquor, 0.08g of lauryl sodium sulfate, 530.0g of pure water and 0-0.15g of pigment. The production process comprises the following steps: preparing the titanium dioxide mother liquor; preparing HPMC sol; adding pigment into the glue solution; dipping glue, baking, demolding, cutting, registering, inspecting, packaging and putting in storage. The preparation process is simple and strong in operability, the capsule product has good molding property, high safety, good reliability and low water content, effectively takes the curative effect of content, is stable in molecule transmission, does not perform crosslinking reaction with the content, is sufficient in solubility, is little impacted by external temperature and humidity, has long preservation period, and is convenient for transporting and storing.

The deep wood chip gel plugging agent is used in water injecting well to plug the high penetrating band in thick oil stratum to lower ineffective water circulation. The deep plugging agent consists of high molecular weight anionic polyacrylamide of molecular weight over 19 million and hydrolysis degree of 25-30 % 0.15-0.5 wt%, phenol compounded polyamine 0.1-0.3 wt%, resorcinol 0.01-0.02 wt%, oxalic acid 0.1-0.2 wt%, wood chip 0.5-2.5 wt% and water 96.48-99.14 wt%, which are compounded into water solution of 0.86-3.52 wt% water solution. The present invention has low use concentration, controllable gel forming time and viscosity, low cost and simple compounding process.

The invention belongs to the technical field of high-molecular materials and particularly relates to a fully-biodegradable polylactic acid thermoplastic elastomer and a preparing method thereof. The polylactic acid thermoplastic elastomer is prepared from component a biology-base vulcanized lactoprene particles, a component b polylactic acid, a component c softening agent and a component d hydrolysis resisting agent; the weight ratio of the component a to the component b is 50:50-75:25, the content of the component c is 10-40 weight parts calculated according to 100 weight parts of the component a, and the content of the component d is 0.5-3 weight parts and 1-2 weight parts preferably calculated according to the total 100 weight parts of the component a and the component c. The polylactic acid thermoplastic elastomer has a full-biodegradation property, good biocompatibility, an excellent mechanical property and can be used as food packaging materials, child toy materials, medical materials and the like.

The invention provides a method for preparing a meta-xylylene diamine epoxy resin, which comprises the following steps of: reacting meta-xylylene diamine with chloroepoxy propane, an additive and alkali at a temperature of between 30 to 85 DEG C; recovering (or not) the rest chloroepoxy propane or meta-xylylene diamine; obtaining the meta-xylylene diamine epoxy resin after processing. The meta-xylylene diamine resin prepared through the method can be cured at a room temperature and be used at a high temperature with low viscosity and a high epoxide number.

The invention discloses a preservative and a preparation method thereof. The preservative comprises the following components in percentage by mass: 0.7-7 parts of isothiazolinone, 0.1-10 parts of a bromine-containing stabilizer and 40-90 parts of water. According to the preservative disclosed by the invention, introduction of heavy metals or nitrates is avoided, the environment is not avoided, andmeanwhile, the physical morphology of a protected product is not damaged. The preservation ensures long-term stability of the protected product, and the content of 5-chloro-2-methylisothiazolinone inthe system is not consumed after the protected product is stored in an environment of 54 DEG C for 30 days. The preservative provided by the invention can be diluted into different concentrations, cross-linking reaction is avoided, and the application range is wide.

The invention discloses a once-forming, fully-glazing and support pin type firing method of small fully-glazed porcelain. A seal is carved in the center of the bottom of the small porcelain related in the method. The fully-glazing and support pin type firing method comprises steps as follows: the part, excluding the seal, of the surface of the porcelain is uniformly dipped with glaze, the seal is taken as a support point, a support seat is used for a support, the porcelain fully dipped with the glaze and the support seat are put into a kiln together to be fired by the aid of support pins, the support seat is a seat plate which is as large as the porcelain and is used for supporting the porcelain, and a trapezoid support bulge matched with the seal is arranged at the center of the top of the seat plate. The method is simple and practical, and the small fully-glazed porcelain can be formed and fired once.

The invention provides a preparation method of poly(iminocarbonimidoyliminocarbonimidoylimino-1,6-hexanediyl)hydrochloride. The method comprises the following steps: (1), polycondensation reaction: firstly, 1,6-hexanediamine dihydrochloride, 1,6-bis(cyanoguanidino)hexane and water are added to an autoclave, nitrogen is introduced to maintain certain pressure in the autoclave, stirring and heatingare performed for a reaction; (2) salting out: the temperature in the autoclave is reduced, water is added to dissolve the material, sodium chloride is added, the mixture is stirred and left to stand,lower water is separated out, and upper poly(iminocarbonimidoyliminocarbonimidoylimino-1,6-hexanediyl)hydrochloride crude product is taken for later use; (3), pH adjustment: water is added to the upper crude product for dissolution, pH is adjusted with a hydrochloric acid solution, and a poly(iminocarbonimidoyliminocarbonimidoylimino-1,6-hexanediyl)hydrochloride aqueous solution is obtained; (4)drying: the aqueous solution is dried, and solid poly(iminocarbonimidoyliminocarbonimidoylimino-1,6-hexanediyl)hydrochloride is obtained. The defect that a solvent and small molecular impurities are difficult to remove in the prior art is overcome, the preparation method has mild reaction conditions and is simple, purity of the obtained product is 98% or higher, the yield can reach 96% or higher,and the method is suitable for large-scale industrial production and application.

The invention relates to a thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and a preparation method of the thermoplastic polyurethane elastomer, and belongs to the field of polyurethane materials. A soft chain segment of the thermoplastic polyurethane elastomer is composed of polytetrahydrofuran ether glycol, and a hard chain segment of the thermoplastic polyurethane elastomer is composed of 4, 4'-dicyclohexylmethane diisocyanate and a novel small-molecule binary secondary amine cyclic chain extender. The thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property is prepared by a two-step method through solution polymerization. The synthesis method is simple, the glass transition temperature can be as low as -104 DEG C, and the material is suitable for an extremely cold environment; and meanwhile, the mechanical property of the thermoplastic polyurethane elastomer is also considered, and the tensile strength reaches up to 47 MPa.

The invention relates to a retarded crosslinked gel, which is prepared from the following raw materials of anionic polyacrylamide, a polyglutamic acid, sodium bichromate, sodium sulfite and water. According to the retarded crosslinked gel, hexavalent chromium ions are firstly complexed with the polyglutamic acid to form a molecular group with certain stability; free hexavalent chromium ions are reduced into trivalent chromium ions by the sodium sulfite; the trivalent chromium ions are crosslinked with the polyacrylamide to form the gel of a mesh structure. The crosslinking rate of the trivalent chromium ions and polyacrylamide is controlled through a dissociation rate of the hexavalent chromium ions in a complexed state, so that retarding the final gelling time. In addition, the polyglutamic acid has a very strong water locking function, so that the gel is not easily bled or broken, the stability of the gel is strengthened, obvious crosslinking reaction is not generated in the production process; the injection pressure is not obviously improved; a working solution is still crosslinked into a semi-flow state polymer gel after being injected into a stratum to generate a profile modification (profile control and displacement) effect.