320 results about "Oxidised starch" patented technology

The invention relates to a 3D (three-dimensional) printing material, which comprises powered ink and a bonder, wherein the powdered ink comprises 100 parts by weight of polyamide, 50 to 80 parts by weight of oxidized starch, 10 to 30 parts by weight of rosin resin, 5 to 80 parts by weight of pigment, 5 to 30 parts by weight of filler and 0.1 to 0.5 part by weight of degassing agent; the bonder comprises 100 parts by weight of epoxy resin, 10 to 30 parts by weight of rosin resin, 5 to 30 parts by weight of filler, 0.1 to 1.5 parts by weight of leveling agent and 0.1 to 0.5 part by weight of degassing agent. According to the 3D printing material, the thermoplastic oxidized starch is adopted, and can be well bonded with the epoxy resin, so that the bonding power between the powdered ink and the bonder is improved, and a solid part with high bonding strength and high firmness is favorably obtained.

The invention discloses a modified starch adhesive and a method for preparing the same. The modified starch adhesive comprises the following components by weight: 30-50 parts of corn starch, 80-120 parts of deionized water, 25-40 parts of sodium hypochlorite solution, 0.5-2 parts of epichlorohydrin, 30-70 parts of polyvinyl acetate emulsion, 10-30 parts of epoxy resin, 2-7 parts of tertiary amine catalyst, 5-15 parts of filler, 0.2-1 part of surfactant, and 0.2-0.6 part of preservative, wherein the sodium hypochlorite solution serves as the oxidant, the polyvinyl acetate emulsion serves as the high-cohesive-energy reinforcement component, and the epoxy resin servers as the water-tolerant modified component. The method for preparing the modified starch adhesive comprises the following steps: mixing the oxidized starch emulsion prepared in advance, the polyvinyl acetate emulsion and the epoxy resin according to proportion uniformly, adding the catalyst, the filler and the preservative, and stirring quickly and uniformly. The modified starch adhesive disclosed by the invention has the advantages of high shear strength, high water-tolerant shear strength, moderate viscosity, good liquidity, moderate primary drying time, low cost and excellent integrated performance.

The invention discloses boilproof alumen-free sheet jellies and a processing method thereof. The boilproof alumen-free sheet jellies comprise the raw materials of starch, oxidized starch, sodium alginate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium carbonate, salt and water. The boilproof alumen-free sheet jellies have the advantages that: the oxidized modified starch is applied to the process for preparing the sheet jellies for the first time; the paste liquid of the oxidized starch is transparent; the paste strip is short; and gelatinous property and film-forming property are high. The oxidized starch has a coordinated compatible and complementary action with the sodium alginate, the sodium dihydrogen phosphate, the disodium hydrogen phosphate, the sodium carbonate and the salt to form a good network structure. Therefore, the prepared sheet jellies have the characteristics of good mouthfeel, boiling resistance, no turbid soup, no broken strips and high transparency. The used oxidized starch has the advantages of simple preparation, eating safety and low cost.

The invention discloses a preparation method for an environment-friendly starch-based binder. According to the method, oxidized starch and modified protein are mixed according to a mass ratio of 2:1 to 5:1; polyvinyl alcohol is added according to a mass ratio of oxidized starch to polyvinyl alcohol of 2:1 to 5:1 and uniformly mixed with oxidized starch and modified protein, and an obtained mixture is subjected to a reaction for 2 to 5 hours at a temperature of 50 to 80 DEG C; first liquid of the binder is prepared; the first liquid of the binder is taken out, an auxiliary agent is added, and the environment-friendly starch-based binder is prepared by uniformly mixing the first liquid of the binder and the auxiliary agent; the auxiliary agent is borax and/or citric acid, and the amount of the auxiliary agent accounts for 2 to 5% of the amount of dry starch base. The oxidation starch is prepared by using sodium periodate as an oxidizing agent and mixing the oxidizing agent with starch at a temperature of 20 to 50 DEG C; the raw material in the invention, starch, undergoes a chemical reaction with protein and produces firm chemical bonds, which enables a net structure of the binder to be formed; the net structure and the action of cross-linking agents allow the binder to have improved stability and enhanced water resistance; the invention enables cost to be saved and the goal of environmental protection to be realized.

The invention discloses starch-based special slurry for sizing a warp containing polyester staple fibers, belonging to the technical field of spinning warp sizing slurry. The starch-based special slurry comprises 10-40% of water-borne copolyether ester, 55-85% of modified starch and 2-5% of sodium carboxymethylcellulose, wherein the water-borne copolyether ester is water-soluble or water-dispersible multi-element block copolyether ester; and the modified starch comprises acidified starch, oxidized starch, carbamate starch, phosphate starch and acetate starch. The sodium carboxymethylcelluloseis modified carboxymethyl cellulose of which the carboxymethyl substitution degree is greater than or equal to 0.8. By adopting the special slurry to size a warp containing polyester staple fibers, the use of PVA (poly vinyl alcohol) slurry in the slurry formula can be remarkably reduced, and pollution of desizing wastewater on ecological environment is effectively reduced.

The invention relates to the field of fertilizers for crops and particularly relates to a preparation process for a urea formaldehyde slow-release and controlled-release compound fertilizer. The preparation process is characterized by comprising the following steps of: (1) adding 430kg of urea into a reaction kettle, adding water with the weight equal to 1.5-4 times of mass of the urea and stirring to dissolve the urea, regulating the pH to be 8-9 by utilizing borax and potassium hydroxide, and carrying out stirring reaction for about 1 hour at 75-80 DEG C; (2) adding oxidized starch with the weight equal to 8-10% of that of the urea, stirring for 15-20 minutes, and regulating the pH to be neutral by utilizing calcium oxide, so as to prepare a urea formaldehyde slow-release agent; and (3) weighing solid materials which are crushed to be 80 meshes according to the weight ratio of nitrogen to phosphorus to potassium to middle-trace elements being 4:1:2:1, putting the solid materials into a stirring machine to be uniformly stirred, putting the uniformly stirred materials into a pelletizer, and spraying the urea formaldehyde slow-release agent to carry out pelleting. With the adoption of the technical scheme, the novel slow-release and controlled-release compound fertilizer has the advantages that not only can the utilization rate of the fertilizer be improved, the food security can be guaranteed, and the environmental pollution can be alleviated; lifetime requirements of crops can be met after the fertilizer is applied once, the labor intensity of famers can be greatly alleviated, and the production inputs can be decreased.

The invention belongs to the field of auxiliary binders in the wallpaper industry and particularly relates to an esterified-starch-modified waxy corn wet glue. The esterified-starch-modified waxy corn wet glue is mainly prepared from the following raw materials in parts by weight through gelatinization, cross-linking and complexation: 76-77 parts of de-ionized water, 5-7 parts of esterified starch A, 3-5 parts of esterified starch B, 4-6 parts of oxidized starch, 4-6 parts of modified waxy corn starch, 0.5-0.8 part of acrylamide, 0.1-0.15 part of nonferrous aluminum sulfate, 0.4 part of sodium benzoate, 0.1-0.15 part of a defoaming agent, 2 parts of urea, 1-1.2 parts of ethylene glycol, 0.2-0.4 part of a bactericide and 2-4 parts of white latex. The invention also provides a preparation method of the modified waxy corn wet glue. The esterified-starch-modified waxy corn wet glue, disclosed by the invention, is extracted and purified from natural waxy corns, belongs to circular plant products and is a renewable resource, so that the policy of saving energy in China is performed better; and meanwhile, the esterified-starch-modified waxy corn wet glue has the advantages of strong bonding power and capabilities of being mixed with water for 100%, improving the bonding area of wallpaper and reducing decoration cost for a user.

A denatured starch for paper-making industry is prepared from the starch through oxidizing, esterifying and grafting. Its advantage is high performance.

The invention relates to a novel admixture for mineral binders, composed of a composition containing at the same time a sugar or an oxidized sugar and a hydrogenated sugar. The oxidized sugar may consist, in particular, of gluconic acid or one of its salts or an oxidized starch hydrolysate. The hydrogenated sugar may consist in particular of maltitol, sorbitol, mannitol, xylitol, arabitol, or a hydrogenated starch hydrolysate containing at least 40% by weight of maltitol. Within the admixture, this composition may be combined with conventional admixtures such as phosphates, borates, or amines. The combination of a sugar or an oxidized sugar and a hydrogenated sugar within this composition makes it possible to obtain synergistic effects, particularly in terms of plasticity and mechanical properties of the mineral binders. The admixtures claimed may be used equally well for admixing with cements, raw materials for cements as for admixing with mortars, slurries and concretes. They may also be used in other sectors such as, for example, the plaster industry, particularly as complexing agents or hydration or dehydration controllers.

The invention relates to a method for preparing compound modified starch for replacing gelatin, which comprises the steps of: first, mixing rice starch and water to form starch milk; adding an oxidant for reaction to obtain oxidized starch, then adding a cross-linking agent for reaction to obtain cross-linking starch, and then adding epoxypropane and alkali liquor for hydroxypropylate reaction to obtain the compound modified starch finally. The compound modified starch has performance advantages of various modified starches, good water-solubility, low pasting temperature, low viscosity of pasting, high stability, strong gelatinization, good freeze thawing stability and high transparency. The method has simple synthesizing process, low cost, high yield, and simple operation and is expected to replace gelatin and be applied actually in preparation of capsule wall material, jelly and candy.

The invention discloses a method for preparing a sulfoethyl-carboxymethyl-crosslinked starch based wallpaper adhesive, which comprises the following steps: (1) in a step of sulfoethyl-carboxymethyl-crosslinked starch preparation, through taking a chloroacetic acid as a carboxymethylated reagent, sodium 2-chloroethanesulfonate monohydrate as a sulfoethylated reagent, and epoxy chloropropane as a crosslinking agent, preparing sulfoethyl-carboxymethyl-crosslinked triple compound modified starches by using a solvent method; and (2) in a step of wallpaper adhesive preparation, through taking sulfoethyl-carboxymethyl-crosslinked starches, hydroxypropyl starches, oxidized starches and starch octenyl succinate anhydride starches as raw materials, adding sodium tetraborate as a crosslinker, and after the obtained mixture is reacted a period of time, adding an additive, uniformly stirring the obtained mixture, and filtering the obtained product so as to obtain the wallpaper adhesive. According to the invention, new varieties of modified starches are developed aiming at the wallpaper adhesive, and other three types of modified starches are compounded; and on the basis of synthesizing the advantages of various modified starches, a starch adhesive for green and environmental-friendly wallpaper, which is strong in adhesive property, high in solid content, rapid in drying speed and good in qualitative property, is prepared, and has the characteristics of non-toxicity and odourlessness.

The invention discloses glue for corrugated paper. The glue comprises, by weight, 10-30 parts of oxidized starch, 2-5 parts of borax, 2-6 parts of sodium hydroxide, 120-180 parts of water, 50-60 partsof polyvinyl alcohol and 15-25 parts of silicone oil. The glue has the advantages that the glue comprise the oxidized starch, borax and sodium hydroxide, and the oxidized starch after being glued promotes bonding of fiber in the corrugated paper, so that strength of the corrugated paper is improved; the oxidized starch is prepared by oxidizing one of wheat starch, corn starch and tapioca starch,thereby being convenient to obtain, easy to degrade and environment-friendly; polyvinyl alcohol has good film forming performance and forms a flexible film on the surface of the corrugated paper, so that the strength of the corrugated paper is further enhanced; the silicone oil is dispersed in raw materials of the glue, and the corrugated paper after being glued has good moistureproof performance,so that the strength, the moistureproof performance and environment-friendly effect of the corrugated paper are improved; the glue is applied in production of high-strength low-gram-weight corrugatedpaper.

The invention discloses a preparation method of compound water retention gel based on starch-grafted acrylic acid, sodium alginate and slag, which comprises the following steps: mixing sodium alginate as an organic matrix and slag as an inorganic porous filler to obtain a dispersion solution, oxidizing starch, grafting sodium hydroxide neutralized acrylic acid, mixing, and crosslinking sodium alginate and oxidized starch with acrylic acid and N,N'-methylenebis(acrylamide) as crosslinkers. The addition of calcium ions enhances the double effect of complexation between sodium alginate and oxidized starch, so that the three-dimensional grid of the prepared water retention gel has different sizes, which is in favor of improving the mechanical strength and water retention property of the water retention agent.

The invention relates to ecotype coal surface curing agent and the preparing method. It includes the following steps: using polyvinyl alcohol, corn starch as basic material, and water as solvent; grafting modification for the polyvinyl alcohol, corn starch; adding catalyst and oxidant to produce oxidized starch; adding caustic soda to gelatinize; adding water to dilute; adding stabilizer and cross-linking agent to prepare other component. It has the features of nontoxic, tasteless, satisfying environmental protection demand, strong coal cohesive force, wide material sources, economic, practical, and huge economic and social benefits for coal railway transportation.

The invention discloses a method for preparing etherification-oxidation-grafting multiple-modified starches. The method comprises the following steps: using native starch as a raw material, adding an etherifying agent, an oxidizing agent and a composite catalyst, and completing etherification and oxidation reaction with one step by adopting a microwave semidry method; using the obtained etherified and oxidized starch as a raw material, adding an initiating agent, a basic catalyst and a composite vinyl monomer, and carrying out graft copolymerization reaction by adopting an open system method in a microwave reactor. The three modification methods of etherification, oxidation and grafting are organically combined, and a variety of reactive groups are grafted in the molecular structure of starch, the method enhances the advantages and avoid weaknesses and has complementary advantages. By regulating a process formula, the method can obtain a series of multiple-modified starches with different ratios of reactive groups and different grafting ratios. The multiple-modified starches have various good characteristics of carboxymethyl-etherified and/or hydroxyalkyl-etherified, oxidized and grafting starches and can be applied to the fields of papermaking, food, textile, daily chemical industry, polymeric flocculants, super absorbent materials, oilfield chemical materials, biodegradable mulch film and plastics and the like.

The invention discloses an original-taste chicken steak and a processing method thereof. According to pickling materials, chicken breast is pickled with the pickling materials and then is coated with powder; pulp is coated and then the powder is coated; the powder for coating is wheat meal, potato starch, corn starch, oxidized starch, table salt, ground white pepper, garlic powder, sodium hydrogen carbonate, sodium carboxymethylcellulose and sodium alginate; and the pulp for coating comprises 3 parts of the table salt, 18 parts of the corn starch, 0.8 part of carrageenan, 0.5 part of a compound moisture retaining agent, 0.5 part of soybean oil, 1 part of egg white and 76.2 parts of water. According to the method, ingredients and additives are accurately selected and matched; the product processed by the method has low oil content and good water retaining property; and the outer-layer wrap is crispy and the inner-layer meat is delicious. The guarantee period of the product is increased by 5-15 days when being compared with that of similar products; the water retaining property is good, the oil content is low, the mouth feel is good and the taste of the chicken breast is improved; the appetite of people is improved and the eating convenience is increased; and by virtue of powder coating and oil frying processes, the product has a crispy taste when people eat.

The invention discloses a preparation method of oxidized starch. Corn starch, sulfuric acid, sodium hydroxide, potassium permanganate and sodium borate are used as main raw materials, and the oxidized starch is prepared via crude starch pretreatment, oxidation, pasting and complexation. The mass parts of the raw materials of the oxidized starch are: 100-110 parts of the corn starch, 11-12 parts of the sulfuric acid, 60-70 parts of the potassium permanganate, 36-40 parts of the sodium hydroxide, 95-105 parts of the sodium borate and 260-280 parts of water. The potassium permanganate is used as an oxidant, and the prepared oxidized starch has the advantages of low gelatinization temperature, good fluidity, white color and good film-forming performance.

The invention discloses a preparing method of sodium starch carboxymethyl oxide based on sweet potato starch, wherein the oxidant is 30% hydrogen peroxide; the alkalizer is sodium hydroxide; the etherifying agent is monochloroacetic acid; the solvent is anhydrous alcohol; these reactions are proceeded in the same reactor simultaneously.

The invention discloses a preparation technology of oxidized hydroxypropyl starch. The preparation technology is characterized by comprising the following steps: S1, preparing starch milk; S2, performing a hydroxypropylation reaction on propylene oxide; S3, oxidizing hydroxypropyl starch; and S4, performing centrifugation, washing, oven drying, smashing and screening to obtain the oxidized hydroxypropyl starch. The oxidized hydroxypropyl starch prepared by the preparation technology has the characteristics of high whiteness, low gelatinization temperature, low paste viscosity, good freeze-thawstability, high transparency and the like, and has common characteristics of oxidized starch and hydroxypropyl starch. By controlling the usage amount of propylene oxide and the hydroxylation time, the content of hydroxypropyl in the starch can be increased, and the oxidized hydroxypropyl starch has strong freeze-thaw stability, and high transparency, salt resistance and acid resistance; and at the same time, after the hydroxylation is finished, oxidation of the starch is continued, and by controlling the usage amount of an oxidant and the oxidation temperature, the content of carboxyl in thestarch can be effectively increased, and the oxidation efficiency can be improved.

A process for the oxidation of starch to obtain carbonyl-substituted starch using V, Cr, Mn, Fe, Co or Cu, wherein Fe and/or Cu are preferred as catalyst. The oxidation of the starch proceeds in quasi-dry form by spraying the dry starch with solutions containing hydrogen peroxide and/or the catalyst and mixing the moistened powder. Oxidized starch containing up to approx. 10 carbonyl groups per 100 glucose units is obtainable.

The invention relates to a modification for styrene acrylic emulsion, which including adding Composite emulsifier which is 1.0-15.5% by weight of all monomer into a four-mouth bottle equipped with agitator, reflux condenser pipe, thermometer and charging device, deionizing and emulsifying for 10min-3h, charging seed monomer and oxidized starch which is 1-50% by weight of all monomer under strong stirring to prepare transparent microemulsion of seed, heating slowly to 40-110 DEG C., charging initiator to initiate emulsion polymerization, adding surplus monomer drop by drop after emulsion being blue for 10min-4h, keeping temperature between 60-110 DEG C. for 30min-6h, regulate pH value to 6.5-10.5 with alkaline materials, continuously stirring for another 15min, then stopping heating, cooling. Then translucent styrene acrylic polymer emulsion modified by oxidized starch with content of solid material between 5% and 65% is obtained. The invention uses oxidized starch to modify styrene acrylic emulsion, enhances solid content of the emulsion, reduces content of free monomer, prolongs storage period, and reduces environmental pollution.

The invention discloses a light paper surface sizing method, belonging to the technical field of pulping and papermaking. The light paper surface sizing method comprises the steps of starch dissolution, starch pasting reaction, and amylase inactivation, dilution, cooling as well as batching for the starch. By improving a traditional oxidized starch surface sizing method, and adopting corn starch, starch amylase, liquid calcium and a water repellent agent to perform a surface sizing technology, the light paper surface sizing method disclosed by the invention has the advantages of not only improving whiteness, glossiness, surface fine and smooth degree and surface intensity of the light paper, but also reducing consumption of a sizing agent in a light paper production process, and having an important significance on improving quality of the product and lowering the production cost.