阅读说明：本技术 一种新型氧化阳离子施胶淀粉 (Novel oxidized cationic sizing starch ) 是由 王明华 乐晓旺 张鹏 程晓冰 李辉龙 徐文辉 于 2019-11-11 设计创作，主要内容包括：本发明涉及淀粉技术领域,且公开了一种新型氧化阳离子施胶淀粉,包括以下步骤：S1：准备原料：玉米淀粉10份、淀粉酶8份、盐酸20份、稀氢氧化钠溶液10份、蒸馏水200份、无水乙醇20份、丙酮20份、氧化剂20份、阳离子醚化剂30份和氢氧化钾溶液30份；S2：原料配制：取玉米淀粉加入到装有蒸馏水的溶解槽内进行溶解,得到淀粉悬浮液；S3：加酶转化：将淀粉悬浮液转入烧瓶中,并使用搅拌器搅拌,向烧瓶内加入淀粉酶和催化剂,加温转化。该新型氧化阳离子施胶淀粉,能够解决施胶液渗透性差,施胶效果不理想的问题。(The invention relates to the technical field of starch, and discloses novel oxidized cationic sizing starch, which comprises the following steps: s1: preparing raw materials: 10 parts of corn starch, 8 parts of amylase, 20 parts of hydrochloric acid, 10 parts of dilute sodium hydroxide solution, 200 parts of distilled water, 20 parts of absolute ethyl alcohol, 20 parts of acetone, 20 parts of an oxidant, 30 parts of a cationic etherifying agent and 30 parts of potassium hydroxide solution; s2: preparing raw materials: adding corn starch into a dissolving tank filled with distilled water for dissolving to obtain a starch suspension; s3: adding enzyme for conversion: the starch suspension is transferred into a flask, stirred by a stirrer, added with amylase and catalyst, and heated for conversion. The novel oxidized cationic sizing starch can solve the problems of poor permeability of a sizing liquid and unsatisfactory sizing effect.)

1. A novel oxidized cationic sizing starch, comprising the steps of:

s1: preparing raw materials: 10 parts of corn starch, 8 parts of amylase, 20 parts of hydrochloric acid, 10 parts of dilute sodium hydroxide solution, 200 parts of distilled water, 20 parts of absolute ethyl alcohol, 20 parts of acetone, 20 parts of an oxidant, 30 parts of a cationic etherifying agent and 30 parts of potassium hydroxide solution;

s2: preparing raw materials: adding corn starch into a dissolving tank filled with distilled water for dissolving to obtain a starch suspension;

s3: adding enzyme for conversion: transferring the starch suspension into a flask, stirring by using a stirrer, adding amylase and a catalyst into the flask, and heating for conversion;

s4: and (3) reducing viscosity of starch: controlling the temperature of the flask obtained in the step S3 by using a water bath, dropwise adding hydrochloric acid with the mass fraction of 5% into the flask by using a constant-pressure dropping funnel, uniformly shaking the flask, adjusting the PH to 7 by using a dilute sodium hydroxide solution after the reaction is finished, performing suction filtration through a reduced-pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain acidolyzed starch;

s5: starch modification: acid-hydrolyzed starch was transferred to another flask and added to 1: 3, preparing a suspension by using distilled water, uniformly shaking the flask, controlling the temperature by using a water bath, adding an oxidant, heating to 60-65 ℃, reacting for 1.5-2 hours, adding a cationic etherifying agent into a potassium hydroxide solution to prepare a mixed solution, adding the mixed solution into the flask under the optimal reaction condition, reacting at constant temperature, adjusting the pH to 7 by using diluted hydrochloric acid after the reaction is finished, carrying out suction filtration by carrying out reduced pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain the low-viscosity oxidized cationic starch.

2. A novel oxidized cationic sizing starch according to claim 1, characterized in that: and the reaction temperature of dropwise adding hydrochloric acid in the step S4 is 35 ℃, and the reaction time is 3 h.

3. A novel oxidized cationic sizing starch according to claim 1, characterized in that: the rotating speed of the stirrer in the step S3 is 50-60 rpm.

4. A novel oxidized cationic sizing starch according to claim 1, characterized in that: the amylase conversion time in the step S3 is 15-20min, and the conversion temperature is 60-80 ℃.

5. A novel oxidized cationic sizing starch according to claim 1, characterized in that: the optimal reaction condition in the step S5 is that the reaction temperature is 15 ℃ and the reaction time is 30 min.

6. A novel oxidized cationic sizing starch according to claim 1, characterized in that: the cationic etherifying agent in the step S5 is 3-chloro-2-hydroxypropyl trimethyl ammonium chloride.

Technical Field

The invention relates to the technical field of starch, in particular to novel oxidized cationic sizing starch.

Background

With the development of paper products towards high-grade and diversified directions, the speed of the paper machine is continuously improved, and higher and finer functional requirements are provided for modified starch. The cationic starch is used in paper pulp making, can improve the retention rate of a pulp machine and fillers, can be used for surface coating and sizing, can obviously improve the strength of paper, improves the anti-fuzz performance, and is suitable for high-viscosity ink printing. More and more manufacturers select cationic starch as a surface sizing agent of paper, but the general industrial cationic starch has high viscosity, is not beneficial to preparing sizing solution with high solid content, and has poor permeability and unsatisfactory sizing effect.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the novel oxidized cationic sizing starch which has the advantages of low viscosity of the sizing liquid, good stability, good surface sizing performance and the like, and solves the problems of poor permeability of the sizing liquid and unsatisfactory sizing effect.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a novel oxidized cationic sizing starch comprising the steps of:

s1: preparing raw materials: 10 parts of corn starch, 8 parts of amylase, 20 parts of hydrochloric acid, 10 parts of dilute sodium hydroxide solution, 200 parts of distilled water, 20 parts of absolute ethyl alcohol, 20 parts of acetone, 20 parts of an oxidant, 30 parts of a cationic etherifying agent and 30 parts of potassium hydroxide solution;

s2: preparing raw materials: adding corn starch into a dissolving tank filled with distilled water for dissolving to obtain a starch suspension;

s3: adding enzyme for conversion: transferring the starch suspension into a flask, stirring by using a stirrer, adding amylase and a catalyst into the flask, and heating for conversion;

s4: and (3) reducing viscosity of starch: controlling the temperature of the flask obtained in the step S3 by using a water bath, dropwise adding hydrochloric acid with the mass fraction of 5% into the flask by using a constant-pressure dropping funnel, uniformly shaking the flask, adjusting the PH to 7 by using a dilute sodium hydroxide solution after the reaction is finished, performing suction filtration through a reduced-pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain acidolyzed starch;

s5: starch modification: acid-hydrolyzed starch was transferred to another flask and added to 1: 3, preparing a suspension by using distilled water, uniformly shaking the flask, controlling the temperature by using a water bath, adding an oxidant, heating to 60-65 ℃, reacting for 1.5-2 hours, adding a cationic etherifying agent into a potassium hydroxide solution to prepare a mixed solution, adding the mixed solution into the flask under the optimal reaction condition, reacting at constant temperature, adjusting the pH to 7 by using diluted hydrochloric acid after the reaction is finished, carrying out suction filtration by carrying out reduced pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain the low-viscosity oxidized cationic starch.

Preferably, the reaction temperature of the dropwise addition of hydrochloric acid in the step S4 is 35 ℃, and the reaction time is 3 hours.

Preferably, the rotation speed of the stirrer in the step S3 is 50-60 rpm.

Preferably, the amylase conversion time in the step S3 is 15-20min, and the conversion temperature is 60-80 ℃.

Preferably, the optimal reaction conditions in the step S5 are a reaction temperature of 15 ℃ and a reaction time of 30 min.

Preferably, the cationic etherifying agent in the S5 step is 3-chloro-2-hydroxypropyl trimethyl ammonium chloride.

(III) advantageous effects

Compared with the prior art, the invention provides a quantitative cement and material feeding device capable of automatically adding water, which has the following beneficial effects:

this novel oxidation cation sizing starch, the paper surface fiber after the sizing is still loose, and the space is great between fibre and the fibre, because the capillary action in space, the glue solution can fine infiltration paper's hole, and the fibre on paper surface combines inseparabler, and fibre stick together tightly to reduce the capillary action that leads to because the space, effectively reduce the speed that the liquid permeates the page, thereby realize better water-resistant effect, also improved paper smoothness degree, the glueing effect is better.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. A novel oxidized cationic sizing starch comprising the steps of:

s1: preparing raw materials: 10 parts of corn starch, 8 parts of amylase, 20 parts of hydrochloric acid, 10 parts of dilute sodium hydroxide solution, 200 parts of distilled water, 20 parts of absolute ethyl alcohol, 20 parts of acetone, 20 parts of an oxidant, 30 parts of a cationic etherifying agent and 30 parts of potassium hydroxide solution;

s2: preparing raw materials: adding corn starch into a dissolving tank filled with distilled water for dissolving to obtain a starch suspension;

s3: adding enzyme for conversion: transferring the starch suspension into a flask, stirring by using a stirrer, adding amylase and a catalyst into the flask, and heating for conversion;

s4: and (3) reducing viscosity of starch: controlling the temperature of the flask obtained in the step S3 by using a water bath, dropwise adding hydrochloric acid with the mass fraction of 5% into the flask by using a constant-pressure dropping funnel, uniformly shaking the flask, adjusting the PH to 7 by using a dilute sodium hydroxide solution after the reaction is finished, performing suction filtration through a reduced-pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain acidolyzed starch;

s5: starch modification: acid-hydrolyzed starch was transferred to another flask and added to 1: 3, preparing a suspension by using distilled water, uniformly shaking the flask, controlling the temperature by using a water bath, adding an oxidant, heating to 60-65 ℃, reacting for 1.5-2 hours, adding a cationic etherifying agent into a potassium hydroxide solution to prepare a mixed solution, adding the mixed solution into the flask under the optimal reaction condition, reacting at constant temperature, adjusting the pH to 7 by using diluted hydrochloric acid after the reaction is finished, carrying out suction filtration by carrying out reduced pressure filtration operation, repeatedly washing a filter cake after the suction filtration by using distilled water, dehydrating by using anhydrous ethanol and acetone, and heating and drying to obtain the low-viscosity oxidized cationic starch.

The reaction temperature of the hydrochloric acid dropwise added in the step S4 is 35 ℃, and the reaction time is 3h, which is the optimal time and temperature for the hydrochloric acid to react with the hydrochloric acid.

The rotation speed of the stirrer in the step S3 is 50rpm, so that the stirrer is not easy to precipitate, and the uniform conversion is ensured.

The conversion time of the amylase in the step S3 is 18min, and the conversion temperature is 60-80 ℃, which is the optimal conversion time and conversion temperature of the amylase.

The optimal reaction condition in the step S5 is that the reaction temperature is 15 ℃ and the reaction time is 30 min.

The cationic etherifying agent in the step S5 is 3-chloro-2-hydroxypropyl trimethyl ammonium chloride.

In conclusion, the novel oxidized cationic sizing starch has the advantages that the fibers on the surface of the paper after sizing are still loose, the gaps between the fibers are large, the glue solution can well penetrate into the pores of the paper due to the capillary action of the gaps, the fibers on the surface of the paper are more tightly combined, and the fibers are tightly adhered together, so that the capillary action caused by the gaps is reduced, the speed of the liquid penetrating into the paper is effectively reduced, the good water-resistant effect is realized, the smoothness of the paper is also improved, and the sizing effect is better.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.