CN111087543A - Preparation method of modified starch for biological latex - Google Patents
Preparation method of modified starch for biological latex Download PDFInfo
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- CN111087543A CN111087543A CN201811238291.2A CN201811238291A CN111087543A CN 111087543 A CN111087543 A CN 111087543A CN 201811238291 A CN201811238291 A CN 201811238291A CN 111087543 A CN111087543 A CN 111087543A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/18—Oxidised starch
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/02—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to polysaccharides
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Abstract
The invention discloses a preparation method of modified starch for biological latex, which comprises the following steps of dissolving starch in distilled water, adding copper sulfate solution and hydrogen peroxide, adding sodium sulfite solution, dissolving oxidized starch after suction filtration, washing and drying in distilled water, stirring uniformly, keeping the temperature to obtain viscous starch paste, cooling, adding α -amylase, stirring, heating to 75-85 ℃ to obtain starch milk with proper viscosity, dissolving PVA in distilled water, adding potassium persulfate, oxidizing, adding starch milk, continuing to oxidize, adding anhydrous sodium sulfite solution, keeping the temperature, cooling starch slurry, adding potassium permanganate solution, adjusting the pH value to 3.2-3.6, transferring into a three-neck flask, adding acrylonitrile, adding hydroquinone solution after reaction, and cooling to room temperature.
Description
Technical Field
The invention relates to a preparation method of modified starch for biological latex.
Background
The adhesive is a common papermaking chemical in the paper surface processing process. In the surface processing process, the hole on the surface of the paper can be filled and covered by the paper surface filling and covering agent, and the smoothness and the tensile strength of the paper are improved, so that the surface strength and the surface performance of the paper and the paperboard are effectively improved.
As a synthetic adhesive, polyvinyl alcohol is a water-soluble high molecular polymer and has good adhesive property and colloid protection property. Because of its good film-forming property and strong adhesive force, it is extensively used in paper sizing coating material. However, polyvinyl alcohol is expensive, and has the disadvantages of easy foaming, so researchers have tried to develop a new adhesive, namely, a biological latex to replace it. The biological latex is an environment-friendly adhesive taking starch as a raw material, and has the advantages of good stability, low cost, wide raw material source, low carbon, environmental friendliness and the like. However, domestic and foreign studies have shown that the adhesion of biological latex is inferior to that of synthetic latex. Other researchers have grafted acrylonitrile onto the molecular chain of starch to improve the bond strength. Although the method has certain effect, the prepared biological latex has insufficient bonding strength, low substitution rate for the biological latex and poor moisture resistance.
Disclosure of Invention
The invention aims to provide a preparation method of modified starch for biological latex.
The invention is realized by the following technical scheme:
a process for preparing modified starch used for biological latex includes such steps as dissolving starch (20-30 portions) in distilled water (80-90 portions), adding copper sulfate solution (0.2 mol/L) and hydrogen peroxide (25-35 portions), regulating pH value of starch milk to 7.4-7.6, reaction at 30-40 deg.C for 4-5 hr, regulating pH value to 6.2-6.4, adding sodium sulfite solution (1 mol/L) (50-60 portions), stopping reaction, dissolving oxidized starch after suction filtering, washing and baking in distilled water, stirring, holding temp at 65-75 deg.C for 15-25min to obtain viscous starch paste, cooling to 45-55 deg.C, adding α -amylase, stirring for 40-50min to obtain viscosity, holding temp at 75-85 deg.C for 40-50min to inactivate amylase, obtaining starch milk with proper viscosity, dissolving PVA in distilled water (70-80 portions), cooling to 70-9 deg.C, adding sodium sulfate, stirring to 5-10.4-20.4-20 mol/L, adding potassium persulfate, reacting, cooling to 5-4.4-4.4.4-4.4.4.4-4.4, adding sodium sulfate, stirring, adding potassium sulfate, stirring to 5-5.4.4, stirring to 5-4-5-4-10-4-one-4-one-5-4-10-4-10-one, stirring, adding pure potassium sulfate, stirring, heating, stirring, adding pure potassium sulfate, stirring, heating to obtain white starch milk, stirring, heating, adding sodium.
Preferably, in the preparation method, the pH value of the starch milk is adjusted to 7.5.
Preferably, in the preparation method, the reaction is carried out for 4.5 hours at 35 ℃.
Preferably, in the preparation method, the pH value is adjusted to be 6.3.
Preferably, in the preparation method, the mixture is placed in a water bath kettle at 70 ℃ for heat preservation for 20 min.
Preferably, in the preparation method, the temperature is raised to 80 ℃ and kept for 45min to inactivate the amylase.
Preferably, in the preparation method, the oxidation is carried out for 40 min.
Preferably, in the preparation method, the temperature is raised to 70 ℃ for curing and the temperature is kept for 20 min.
Preferably, in the preparation method, the reaction is carried out for 4.5 hours.
The invention has the technical effects that:
the method is simple, convenient, fast and easy to operate, and the prepared modified starch has high bonding strength, so that the prepared biological latex has good film forming property, bonding strength, mechanical stability and storage stability.
Detailed Description
The following describes the substance of the present invention with reference to the examples.
Example 1
A preparation method of modified starch for biological latex comprises the following steps of dissolving 25 parts of starch in 85 parts of distilled water, adding 35 parts of copper sulfate solution with the concentration of 0.2mol/L and 30 parts of hydrogen peroxide, adjusting the pH value of starch milk to 7.5, reacting for 4.5 hours at 35 ℃, adjusting the pH value to 6.3, adding 55 parts of sodium sulfite solution with the concentration of 1mol/L, stopping reaction, dissolving oxidized starch after suction filtration, washing and drying in distilled water, stirring uniformly, placing in a 70 ℃ water bath kettle, preserving heat for 20 minutes to obtain viscous starch paste, cooling to 50 ℃, adding 8 parts of α -amylase, stirring for 45 minutes to obviously reduce the viscosity of the starch paste, heating to 80 ℃, preserving heat for 45 minutes to inactivate the amylase to obtain starch milk with proper viscosity, dissolving 20 parts of PVA in 75 parts of distilled water, stirring uniformly, placing in an 80 ℃ water kettle, cooling until the PVA is completely dissolved, cooling to 45 ℃, adding 25 parts of potassium persulfate, adjusting the pH value after 40 minutes, adjusting to 40 minutes, adding pure starch milk to 0.5 minutes, adding acrylonitrile, cooling to 5.5 minutes, adding pure starch solution with the concentration of 5.5 minutes, adding acrylonitrile, adding water, stirring, reacting to 0.5 minutes to obtain pure starch solution, cooling, adding acrylonitrile, adding sodium sulfite solution with the concentration of 1.5 parts of 1.5 minutes to 0.5 minutes to 0 mol/L, and reacting, cooling to obtain pure starch solution, and reacting, and cooling to obtain pure starch solution, and reacting to obtain a potassium sulfite solution with the reaction solution of 0.4 parts of 0.5 hours, and the reaction.
Example 2
A preparation method of modified starch for biological latex comprises the following steps of dissolving 20 parts of starch in 80 parts of distilled water, adding 30 parts of copper sulfate solution with the concentration of 0.2mol/L and 25 parts of hydrogen peroxide, adjusting the pH value of starch milk to 7.4, reacting for 4 hours at 30 ℃, adjusting the pH value to 6.2, adding 50 parts of sodium sulfite solution with the concentration of 1mol/L, stopping the reaction, dissolving oxidized starch after suction filtration, washing and drying in distilled water, stirring uniformly, placing in a 65 ℃ water bath kettle, preserving heat for 15 minutes to obtain viscous starch paste, cooling to 45 ℃, adding 7 parts of α -amylase, stirring for 40 minutes to obviously reduce the viscosity of the starch paste, heating to 75 ℃, preserving heat for 40 minutes to inactivate the amylase to obtain proper starch milk, dissolving 15 parts of PVA in 70 parts of distilled water, stirring uniformly, placing in a 75 ℃ water bath kettle, cooling to completely dissolve, adding 20 parts of potassium, adding 35 minutes after oxidation, adjusting the viscosity, adjusting the PVA to 70 parts of PVA, adding to 70 parts of pure PVA, cooling to 4.4 minutes, adding pure PVA, adjusting the pH value to 10.4 minutes, adding sodium sulfite solution, adding pure water, stirring, cooling to 10 parts of sodium sulfite solution, adding water, adjusting the concentration to 2.2 mol/L, adding pure potassium sulfite solution, stirring to 6.4 to react, adding to 0.4 to 0 to 6 minutes, cooling to obtain pure sodium sulfite solution, adding water, cooling, adding sodium sulfite solution, cooling to react, adding 10 parts of sodium sulfite solution, cooling to 45 parts of sodium sulfite solution, cooling to obtain pure starch, cooling to react, adding 10 parts of sodium sulfite solution, adding 10 parts of sodium hydrosulfite, cooling to react, cooling to obtain pure starch solution, adding 10 parts of sodium sulfite solution, cooling to obtain pure starch.
Example 3
A preparation method of modified starch for biological latex comprises the following steps of dissolving 30 parts of starch in 90 parts of distilled water, adding 40 parts of copper sulfate solution with the concentration of 0.2mol/L and 35 parts of hydrogen peroxide, adjusting the pH value of starch milk to 7.6, reacting for 5 hours at 40 ℃, adjusting the pH value to 6.4, adding 60 parts of sodium sulfite solution with the concentration of 1mol/L, stopping the reaction, dissolving oxidized starch after suction filtration, washing and drying in distilled water, stirring uniformly, placing in a 75 ℃ water bath kettle, keeping the temperature for 25 minutes to obtain viscous starch paste, cooling to 55 ℃, adding 9 parts of α -amylase, stirring for 50 minutes to obviously reduce the viscosity of the starch paste, heating to 85 ℃, keeping the temperature for 50 minutes to inactivate the amylase to obtain proper starch milk, dissolving 25 parts of PVA in 80 parts of distilled water, stirring uniformly, placing in an 85 ℃ water bath kettle, cooling to the temperature until the PVA is completely dissolved, then, adding 30 parts of potassium, oxidizing for 45 minutes, adjusting the viscosity, adjusting the PVA to 80 parts of PVA, adding to 8.8 minutes, adding pure PVA, cooling to 20 parts of starch solution, adding sodium sulfite solution, cooling to 20.8 parts of pure starch solution, adding acrylonitrile, adjusting the pH value to 5 minutes, cooling to obtain a 1.8 parts of pure starch solution, keeping the pH value of sodium sulfite solution, adding water solution, keeping the solution, cooling to react to 5 parts of sodium sulfite solution, keeping the concentration of 0.8, cooling to 5 minutes, adding the solution, cooling to obtain a white starch solution, keeping the solution with the sodium sulfite solution with the concentration of 1.8 parts of 1.4 parts of sodium sulfite solution, adding the sodium sulfite solution, cooling to the sodium sulfite solution, cooling.
The method is simple, convenient, fast and easy to operate, and the prepared modified starch has high bonding strength, so that the prepared biological latex has good film forming property, bonding strength, mechanical stability and storage stability.
Claims (9)
1. A process for preparing modified starch used for biological latex includes such steps as dissolving 20-30 portions of starch in 80-90 portions of distilled water, adding 0.2mol/L copper sulfate solution (30-40 portions) and hydrogen peroxide (25-35 portions), regulating pH value to 7.4-7.6, reaction at 30-40 deg.C for 4-5 hr, regulating pH value to 6.2-6.4, adding 1mol/L sodium sulfite solution (50-60 portions), stopping reaction, dissolving oxidized starch after suction filtering, washing and baking in distilled water, stirring, holding temp in 65-75 deg.C water bath for 15-25min to obtain viscous starch paste, cooling to 45-55 deg.C, adding α -amylase (7-9 portions), stirring for 40-50min to obtain viscosity, holding temp at 75-85 deg.C for 40-50min to inactivate starch, obtaining starch milk with proper viscosity, adding PVA (15-25 portions), distilling to 70-70 portions, stirring for 40-50min, cooling to 60-50 min, adding 5-10 portions of PVA, adding 5-10 portions of potassium persulfate solution, cooling to 5-4.4-20.4-4-20-4-5-4-1-4-5-1-60-4-5-4-60-one-5-one-two-one-two-one-two.
2. The method of claim 1, wherein: adjusting the pH value of the starch milk to 7.5.
3. The method of claim 1, wherein: the reaction was carried out at 35 ℃ for 4.5 h.
4. The method of claim 1, wherein: the pH was adjusted to 6.3.
5. The method of claim 1, wherein: placing in 70 deg.C water bath, and keeping the temperature for 20 min.
6. The method of claim 1, wherein: heating to 80 deg.C, and keeping the temperature for 45min to inactivate amylase.
7. The method of claim 1, wherein: and (5) oxidizing for 40 min.
8. The method of claim 1, wherein: heating to 70 deg.C for aging and keeping the temperature for 20 min.
9. The method of claim 1, wherein: the reaction was carried out for 4.5 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811238291.2A CN111087543A (en) | 2018-10-23 | 2018-10-23 | Preparation method of modified starch for biological latex |
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| CN201811238291.2A CN111087543A (en) | 2018-10-23 | 2018-10-23 | Preparation method of modified starch for biological latex |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113861299A (en) * | 2021-10-19 | 2021-12-31 | 山东寿光巨能金玉米开发有限公司 | Environment-friendly production method of surface glue starch for papermaking |
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2018
- 2018-10-23 CN CN201811238291.2A patent/CN111087543A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113861299A (en) * | 2021-10-19 | 2021-12-31 | 山东寿光巨能金玉米开发有限公司 | Environment-friendly production method of surface glue starch for papermaking |
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