阅读说明：本技术 一种纸浆糊及其制备方法 (Paper pulp paste and preparation method thereof ) 是由 郭邦武 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种纸浆糊及其制备方法,所述制备纸浆糊的方法包括以下步骤：首先,按重量比重添加550份一次清水,蒸汽加热至35-39℃,加入35份一次淀粉,搅拌混合均匀后加入70份一次碱液,继续搅拌得到熟糊A,然后,按重量比重继续添加750份二次清水,蒸汽加热至35-39℃,加入335份二次淀粉,搅拌混合均匀,得到熟糊B,接下来,在得到的熟糊B中加入50份二次碱液和4.6份的安定剂,在搅拌条件下混合,然后先后加入4.6份的硼砂和16份的架桥剂,继续搅拌至成糊状,得到浆糊C,最后,在54-61℃下糊化形成糊黏度为12-21Pa·s的纸浆糊D。本发明纸浆糊中添加架桥剂和安定剂,能够抑制淀粉颗粒继续澎润,增加接著力,接著层防水,从而提高纸浆糊的防水性。(The invention discloses a paper pulp paste and a preparation method thereof, wherein the preparation method of the paper pulp paste comprises the following steps: firstly, adding 550 parts of primary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 35 parts of primary starch, stirring and mixing uniformly, adding 70 parts of primary alkali liquor, continuously stirring to obtain cooked paste A, then, continuously adding 750 parts of secondary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 335 parts of secondary starch, stirring and mixing uniformly to obtain cooked paste B, then, adding 50 parts of secondary alkali liquor and 4.6 parts of stabilizing agent into the obtained cooked paste B, mixing under the stirring condition, then, sequentially adding 4.6 parts of borax and 16 parts of bridging agent, continuously stirring to form paste to obtain paste C, and finally, pasting at 54-61 ℃ to form pulp D with the paste viscosity of 12-21Pa s. The bridging agent and the stabilizer are added into the paper pulp paste, so that starch particles can be inhibited from being continuously swelled, the adhesive force is increased, and the adhesive layer is waterproof, so that the waterproofness of the paper pulp paste is improved.)

1. A method of making a paper pulp paste, comprising the steps of:

step S1: adding 550 parts of primary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 35 parts of primary starch, stirring and mixing the mixture uniformly, adding 70 parts of primary alkali liquor, and continuing stirring to obtain cooked paste A;

step S2: continuously adding 750 parts of secondary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 335 parts of secondary starch, and uniformly stirring and mixing to obtain cooked paste B;

step S3: adding 50 parts of secondary alkali liquor and 4.6 parts of stabilizer into the obtained cooked paste B, mixing under stirring, then sequentially adding 4.6 parts of borax and 16 parts of bridging agent, and continuously stirring to form paste to obtain paste C;

step S4: gelatinizing at 54-61 deg.C to obtain pulp paste D with paste viscosity of 12-21 Pa.s.

2. The method for preparing a paper pulp paste according to claim 1, characterized in that: the specific gravity of the alkali liquor used for preparing the paper pulp paste is 10-12 g/L.

3. The method for preparing a paper pulp paste according to claim 1, characterized in that: the optimal temperature of the steam heating in step S1 and step S2 is 37 ℃.

4. The method for preparing a paper pulp paste according to claim 1, characterized in that: in step S4, the gelatinization time is 45 minutes, and the paste viscosity is 16Pa · S.

5. A pulp paste produced by the method of claim 1, comprising the following components in parts by weight: 1320 portions of clear water 1170-.

6. The paper pulp paste of claim 5, wherein: the starch comprises one of corn starch and cassava starch.

7. The paper pulp paste of claim 5, wherein: the bridging agent is CA601, and the stabilizer is SB 101.

8. The paper pulp paste of claim 5, wherein: the components are preferably as follows in parts by weight: 1300 parts of clear water, 370 parts of starch, 120 parts of alkali liquor, 4.6 parts of borax, 16 parts of bridging agent and 4.6 parts of stabilizer.

Technical Field

The invention relates to the field of adhesives, in particular to a paper pulp paste and a preparation method thereof.

Background

Starch is a natural polymer, when a starch suspension is heated, the appearance of starch grains is not changed before the starch grains reach a certain critical temperature, and when the starch suspension reaches the critical temperature, some starch grains suddenly swell and lose the cross-shaped characteristic, and the two phenomena occur from the center and quickly diffuse to the periphery. The swelling temperature of each particle of the same starch grain is different, but the swelling temperature is about 10 ℃, and the gelatinization temperature of each particle is different, probably because of the different combination between starch molecules. The gelatinization may start in the region of the amorphous complex of starch grains where the bond is weakest, and it is clear that the bonding of these amorphous regions varies in degree of bonding in each starch grain, so that the gelatinization temperature is not a single temperature, but rather a range of temperatures.

Starch viscosity is a very important factor affecting the water resistance of the paste produced and is one of the simplest variables for the operator to control, the general rule being that high paste viscosity resists retrowetting of the paper and retains water on the paste line. Conversely, when the paste is too viscous, the moisture quickly leaves the batter lines, which have a white appearance because of the lack of water associated with raw starch or because the batter lines on the tops appear glossy because the adhesive is almost completely absorbed by the core paper and gels before contacting the backing paper. Currently, the waterproof property of the paste used in the market needs to be improved so as to be applied to more scenes.

Disclosure of Invention

In view of the above problems, the present invention is to develop a pulp paste with high water resistance, which can meet the demands of more scenes on the pulp paste, and to solve the above problems in the prior art, the technical solution of the present invention is:

a method of making a paper pulp paste comprising the steps of:

step S1: adding 550 parts of primary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 35 parts of primary starch, stirring and mixing the mixture uniformly, adding 70 parts of primary alkali liquor, and continuing stirring to obtain cooked paste A;

step S2: continuously adding 750 parts of secondary clear water according to the weight proportion, heating the mixture to 35-39 ℃ by steam, adding 335 parts of secondary starch, and uniformly stirring and mixing to obtain cooked paste B;

step S3: adding 50 parts of secondary alkali liquor and 4.6 parts of stabilizer into the obtained cooked paste B, mixing under stirring, then sequentially adding 4.6 parts of borax and 16 parts of bridging agent, and continuously stirring to form paste to obtain paste C;

step S4: gelatinizing at 54-61 deg.C to obtain pulp paste D with paste viscosity of 12-21 Pa.s.

Preferably, the specific gravity of the alkali liquor used for preparing the paper pulp paste is 10-12 g/L.

Preferably, the optimal temperature of the steam heating in step S1 and step S2 is 37 ℃.

Preferably, the gelatinization time in step S4 is 45 minutes, and the paste viscosity is 16Pa · S.

In order to solve the technical problems, the invention also provides a pulp paste prepared by the method, which comprises the following components in parts by weight: 1320 portions of clear water 1170-.

Preferably, the starch comprises one of corn starch and tapioca starch.

Preferably, the bridging agent is CA601, and the stabilizer is SB 101.

Preferably, the components are preferably in parts by weight: 1300 parts of clear water, 370 parts of starch, 120 parts of alkali liquor, 4.6 parts of borax, 16 parts of bridging agent and 4.6 parts of stabilizer

The paper pulp paste can inhibit starch granules from being continuously swelled and moistened by adding the bridging agent and the stabilizer, and the hydration process is carried out at the starch pasting moment to generate bridging reaction with starch hydroxyl to form a solidification phase with stable key joint, so that the adhesion force is increased, and the adhesion layer is waterproof, thereby greatly improving the waterproofness of the paper pulp paste and enabling the paper pulp paste to be applied to more scenes.

Drawings

FIG. 1 is an overall flow diagram of a process for preparing a paper pulp paste according to the present invention;

FIG. 2 is a diagram of experimental parameters for four embodiments of the present invention.

In the figure, S1-step 1, S2-step 2, S3-step 3, S4-step 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only some 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.

As shown in fig. 1, in a flowchart of a method for preparing a paper pulp paste according to the present invention, the flow of the method for preparing a paper pulp paste includes: firstly, adding 550 parts of primary clear water according to the weight proportion, heating steam to 37 ℃, adding 35 parts of primary starch, opening a stirrer, stirring for 1 minute, adding 70 parts of primary alkali liquor, and continuously stirring for 5 minutes to obtain cooked paste A; then, continuously adding 750 parts of secondary clear water according to the weight proportion, stirring for 0.5 minute, heating to 37 ℃ through steam, adding 335 parts of secondary starch, stirring for 2 minutes, and uniformly mixing to obtain cooked paste B; next, adding 50 parts of secondary alkali liquor and 4.6 parts of stabilizer into the obtained cooked paste B, mixing for 2 minutes under the stirring condition, then adding 4.6 parts of borax, continuing to stir for 2 minutes, adding 16 parts of bridging agent, and stirring to form paste to obtain paste C; finally, the temperature is raised to 54-61 ℃, stirring is stopped, and gelatinization is carried out for 45 minutes, so that pulp paste D with the viscosity of 16 pas is formed.

In specific example 1 of the present invention, the pulp paste comprises the following components in parts by weight in the single-watt summer case: 1280-1320 parts of clear water, 350-390 parts of starch, 100-140 parts of alkali liquor, 4.3-5.3 parts of borax, 13-17 parts of bridging agent and 2.5-6.5 parts of stabilizing agent, wherein the steam heating temperature is 35-39 ℃, the specific gravity of the alkali liquor adopted for preparing the paper pulp paste is 10-12g/L, the gelatinization temperature is 56-60 ℃, and the viscosity of the gelatinized paper pulp paste is 12-16 Pa.s.

In specific example 2 of the present invention, the pulp paste comprises the following components in parts by weight in the case of a single-watt winter season: 1280-1320 parts of clear water, 410 parts of 370-410 parts of starch, 150 parts of 110-6.5 parts of alkali liquor, 3.5-4.5 parts of borax, 13-17 parts of bridging agent and 2.5-6.5 parts of stabilizing agent, wherein the steam heating temperature is 35-39 ℃, the specific gravity of the alkali liquor adopted for preparing the paper pulp paste is 10-12g/L, the gelatinization temperature is 57-61 ℃, and the viscosity of the gelatinized paper pulp paste is 15-19 Pa.s.

In specific example 3 of the present invention, the pulp paste comprises the following components in parts by weight in the summer season of application: 1230 parts of clear water 1170-.

In specific example 4 of the present invention, the pulp paste comprises the following components in parts by weight in the case of application to winter: 1230 parts of clear water 1170-

Specifically, in various embodiments, the starch in the composition comprises one of corn starch and tapioca starch; the bridging agent in the component has the model of CA601, and the stabilizer has the model of SB 101; the components have the following preferable parts by weight: 1300 parts of clear water, 370 parts of starch, 120 parts of alkali liquor, 4.6 parts of borax, 16 parts of bridging agent and 4.6 parts of stabilizer.

In the preparation process, if the temperature is raised to be lower than 54 ℃, the paste is not gelatinized completely, and if the temperature is raised to be higher than 61 ℃, excessive gelatinization can affect the viscosity and the water resistance of the paste, so that the temperature is optimally in the range of 54-61 ℃; the addition of the bridging agent and the stabilizing agent is favorable for inhibiting the starch granules from being continuously swelled, and the hydration process is carried out at the starch gelatinization moment to generate bridging reaction with starch hydroxyl to form a solidification phase with stable key joint, so that the adhesion force is increased, the adhesion layer is waterproof, and the waterproofness of the paper pulp paste is greatly improved.

In conclusion, the preparation method of the paper pulp paste has the advantages of simple operation, low manufacturing cost and the like, and the water resistance of the paper pulp paste can be greatly improved by adding the bridging agent and the stabilizing agent, so that the preparation method of the paper pulp paste is beneficial to the application of the paper pulp paste in different scenes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the changes or modifications within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.