CN109487620A - A kind of papermaking dry-strengthening agent and preparation method thereof - Google Patents
A kind of papermaking dry-strengthening agent and preparation method thereof Download PDFInfo
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- CN109487620A CN109487620A CN201811485041.9A CN201811485041A CN109487620A CN 109487620 A CN109487620 A CN 109487620A CN 201811485041 A CN201811485041 A CN 201811485041A CN 109487620 A CN109487620 A CN 109487620A
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- strengthening agent
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- papermaking dry
- cationic starch
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
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Abstract
The invention discloses a kind of papermaking dry-strengthening agents, by forming following weight percentage components: soyabean protein powder 8%~15%, polyacrylamide emulsion 20%~30%, cationic starch with high substitution degree 10%~20%, diatomite 0.5%~5%, nonionic guar gum 0.5%~3%, anti-crosslinking agent 0.5%~2%, multiplex catalyst 0.1%~1%, pH adjusting agent 0.05%~0.5% and deionized water surplus.Papermaking dry-strengthening agent of the invention can effectively increase interfibrous bonded area and bond strength in paper making pulp, form more hydrogen bonds, to improve the physical strength of paper.Meanwhile the retention of fiber and filler also can be improved in papermaking dry-strengthening agent of the invention, to reduce the resource loss in paper production, mitigate the processing pressure of paper waste, preparation method is simple, and used raw material sources are extensive, preparation process no three wastes generates, safety and environmental protection.
Description
Technical field
The present invention relates to pulp technology for making paper, and in particular to a kind of papermaking dry-strengthening agent and preparation method thereof.
Background technique
With the continuous improvement of social and economic level, requirement of the consumer to the quality and grade of paper is also higher and higher.
Intensity is a kind of structural property of paper, depends primarily on the property of combination situation and fiber in page between fiber itself.
The intensity combined between fiber is directly related with the quality and quantity of hydrogen bond, covalent bond that connecting inner is formed.Paper strength mentions
Height can be realized by being beaten, improving long stapled proportion and using reinforcing agent.In the influence of environmental pollution and shortage of resources
Under, more and more waste paper fibres are recycled in paper making, and therefore, the application of paper making intensifier is for improving paper
Intensity is particularly important.Drying strengthening agent is a kind of binding force between reinforcing fiber, improves paper physical intensity without shadow
Ring the fine chemicals of its wet strength.
Currently, most commonly used in papermaking dry-strengthening agent preparation is polyacrylamide.Polyacrylamide (PAM) is water-soluble
High-molecular compound, acrylamide can prepare the polyacrylamide derivative of different molecular weight and charge density by polymerization.
Amide groups and double bond on polyacrylamide molecular backbone have fine reactivity, can by neutralize charge, be crosslinked bridge formation,
It is embedded in or is adsorbed in paper pulp fiber and carry out net distribution, reach good retention aid and filtering aid and strengthening for paper effect.But due to
Polyacrylamide is to be obtained by acrylamide polymerization, therefore can have the problems such as molecular weight distribution is uneven, is increased as paper
The effect of strong agent is bad, and linear structure also leads to that fine and close reticular structure can not be formed with cellulose, for small short fibers
Retention and drainage effect it is undesirable.
Summary of the invention
It is an object of the invention to overcome above-mentioned shortcoming and defect of the existing technology, provide a kind of papermaking dry-strengthening agent and
Preparation method.The papermaking dry-strengthening agent can effectively increase interfibrous bonded area and bond strength in paper making pulp, be formed
The retention of fiber and filler in slurry also can be improved to improve the physical strength of paper in more hydrogen bonds.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of papermaking dry-strengthening agent, by forming following weight percentage components: soyabean protein powder 8%~15%, poly- third
Acrylamide lotion 20%~30%, cationic starch with high substitution degree 10%~20%, diatomite 0.5%~5%, nonionic Guar
Glue 0.5%~3%, anti-crosslinking agent 0.5%~2%, multiplex catalyst 0.1%~1%, pH adjusting agent 0.05%~
0.5% and deionized water surplus.
Soyabean protein powder is the byproduct for obtaining the Soybean Meal for extracting soya-bean oil after low temperature desolventizing, is by nearly 20 kinds of ammonia
The high polymer of base acid composition, is a kind of circulation renewable resource, and abundance is cheap, has gelation, emulsibility and holds
The properties such as aqueous, processing performance is good, safety non-pollution.
Polyacrylamide emulsion is a kind of novel polyacrylamide product form, is produced with traditional polyacrylamide dry powder
Condition ratio has the characteristics that solution rate is fast, low energy consumption, environmentally friendly, safe and effective content is high.Polyacrylamide emulsion is applicable in
PH value range is wide, and charge stability is high, can form ionic bond with the anion on fiber, amide groups therein can also on fiber
Hydroxyl formed hydrogen bond.The polyacrylamide emulsion that the present invention uses is purchased from Henan Xin Quan for what is produced using antiphase emulsifiable method
Chemical Industry Science Co., Ltd, CAS:9003-05-8, molecular weight height (6,000,000~20,000,000), performance are stablized, can without demulsification
It directly uses, water-soluble strong, solution rate is fast, is able to carry out various chemical reactions.
Cationic starch belongs to converted starch, affinity to negatively charged substance.High substituted degree cation
Starch has polymolecularity and dissolubility, and energy cold water expansion, the clarity and stability of dispersion liquid are high, viscosity stabilization, encompassing property
It is good.The positive charge of cationic starch with high substitution degree is easy to tie with filler negatively charged in paper pulp and fiber (including fiber fines)
It closes, thus to the retention of fiber fines and filler when improving copy paper, moreover it is possible to enhance the dry and wet intensity of paper, while reach retention
With the effect of enhancing.Preferably, the degree of substitution of the cationic starch with high substitution degree is 0.2~0.3.
The present invention has found that soyabean protein powder, polyacrylamide emulsion and high substituted degree are cationic by lot of experiments
Starch is compounded with inventive formulation, has synergistic function in terms of strengthening for paper, so that the paper of papermaking dry-strengthening agent be made to increase
Potent fruit is more preferable.
Preferably, the mass ratio of the soyabean protein powder, polyacrylamide emulsion and cationic starch with high substitution degree is,
Soyabean protein powder: polyacrylamide emulsion: cationic starch with high substitution degree=10~14:22~28:12~16.At this point, soybean
The synergistic function of albumen powder, polyacrylamide emulsion and cationic starch with high substitution degree in terms of strengthening for paper is preferable, makes
The strengthening for paper effect of paper drying strengthening agent is also preferable.
Preferably, the mass ratio of the soyabean protein powder, polyacrylamide emulsion and cationic starch with high substitution degree is,
Soyabean protein powder: polyacrylamide emulsion: cationic starch with high substitution degree=12:25:15.At this point, soyabean protein powder, polypropylene
The synergistic function of amide lotion and cationic starch with high substitution degree in terms of strengthening for paper is best, the paper of papermaking dry-strengthening agent
Reinforcing effect is preferably also.
Diatomite is a kind of harmless natural minerals, and main chemical compositions are silica, has porosity
Greatly, the characteristics such as strong adsorption, bulk density is small and nontoxic.The diatomite resource in China is abundant, but conventional use is single, is mainly limited to
Filter aid product.The present invention is found through experiments that, in papermaking dry-strengthening agent formula of the invention, suitable diatomite, energy is added
Papermaking dry-strengthening agent is effectively increased to the enhancing efficiency of paper.
Nonionic guar gum is a kind of seed glue extracted from natural leguminous plant, good water solubility, is had and cellulose
Very similar monomers and polysaccharide structure, thus have very strong affinity to fiber, can forcefully be adsorbed on paper pulp fiber and
Generate reinforcing effect.
Preferably, the papermaking dry-strengthening agent by forming following weight percentage components: soyabean protein powder 10%~
14%, polyacrylamide emulsion 22%~28%, cationic starch with high substitution degree 12%~16%, diatomite 2%~4%, non-
Cationic guar 1%~3%, anti-crosslinking agent 1%~2%, multiplex catalyst 0.4%~0.8%, pH adjusting agent 0.1%
~0.4% and deionized water surplus.
Most preferably, the papermaking dry-strengthening agent by forming following weight percentage components: soyabean protein powder 12%, poly- third
Acrylamide lotion 25%, cationic starch with high substitution degree 15%, diatomite 3%, nonionic guar gum 2%, anti-crosslinking agent
1.5%, multiplex catalyst 0.6%, pH adjusting agent 0.3% and deionized water surplus.
Preferably, the anti-crosslinking agent includes at least one of sodium sulphate, sodium chloride.
Preferably, the multiplex catalyst includes at least one of potassium peroxydisulfate, Ammonium Persulfate 98.5.
Preferably, the pH adjusting agent is at least one of hydrochloric acid, sulfuric acid, acetic acid, acetic acid, citric acid.
Preferably, the preparation method of the papermaking dry-strengthening agent includes the following steps: polyacrylamide emulsion and high substitution
It spends cationic starch to be added in deionized water, stir evenly, soyabean protein powder and diatomite is then added, stirs evenly, then
Nonionic guar gum, anti-crosslinking agent, multiplex catalyst and pH adjusting agent are continuously added, 1~2h is stirred at 70~80 DEG C,
It is finally cooled to room temperature, the papermaking dry-strengthening agent is made.
Compared with prior art, the beneficial effects of the present invention are:
1, papermaking dry-strengthening agent of the invention can effectively increase interfibrous bonded area and bond strength, shape in paper making pulp
At more hydrogen bonds, to improve the physical strength of paper.
2, papermaking dry-strengthening agent of the invention is in paper making wet part, preparation method to be simple, and used raw material sources are wide
General, preparation process no three wastes generates, safety and environmental protection.
3, the retention of fiber and filler in slurry also can be improved in papermaking dry-strengthening agent of the invention, reduces in paper production
Resource loss, also mitigate the processing pressure of paper waste.
Specific embodiment
It to facilitate the understanding of the present invention, below will be to invention is more fully described.The present invention can be with many not
With form realize, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of invention is more thorough and comprehensive.
The degree of substitution for the cationic starch with high substitution degree that the embodiment of the present invention uses is 0.2, is purchased from Shandong east up to biology
Chemical Co., Ltd..
Embodiment 1
The embodiment of the present invention 1 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 12%, polyacrylamide emulsion 25%, cationic starch with high substitution degree 15%, diatomite 3%, nonionic guar gum 2%, sulphur
Sour sodium 1.5%, potassium peroxydisulfate 0.6%, hydrochloric acid 0.3% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium sulphate, potassium peroxydisulfate and hydrochloric acid, stir 2h at 75 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Embodiment 2
The embodiment of the present invention 2 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 10%, polyacrylamide emulsion 28%, cationic starch with high substitution degree 12%, diatomite 2%, nonionic guar gum 3%, chlorine
Change sodium 1%, Ammonium Persulfate 98.5 0.8%, sulfuric acid 0.1% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium chloride, Ammonium Persulfate 98.5 and sulfuric acid, stir 2h at 70 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Embodiment 3
The embodiment of the present invention 3 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 14%, polyacrylamide emulsion 22%, cationic starch with high substitution degree 16%, diatomite 4%, nonionic guar gum 1%, chlorine
Change sodium 2%, Ammonium Persulfate 98.5 0.4%, citric acid 0.4% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium chloride, Ammonium Persulfate 98.5 and citric acid, stir 1h at 80 DEG C, be finally cooled to room temperature, is made described
Papermaking dry-strengthening agent.
Embodiment 4
The embodiment of the present invention 4 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 15%, polyacrylamide emulsion 20%, cationic starch with high substitution degree 20%, diatomite 0.5%, nonionic guar gum
0.5%, sodium sulphate 1%, potassium peroxydisulfate 1%, acetic acid 0.05% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium sulphate, potassium peroxydisulfate and acetic acid, stir 2h at 80 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Embodiment 5
The embodiment of the present invention 5 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 8%, polyacrylamide emulsion 30%, cationic starch with high substitution degree 10%, diatomite 5%, nonionic guar gum 3%, sulphur
Sour sodium 0.5%, Ammonium Persulfate 98.5 1%, acetic acid 0.5% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium sulphate, Ammonium Persulfate 98.5 and acetic acid, stir 1.5h at 75 DEG C, be finally cooled to room temperature, is made described
Papermaking dry-strengthening agent.
Embodiment 6
The embodiment of the present invention 6 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 10%, polyacrylamide emulsion 30%, cationic starch with high substitution degree 15%, diatomite 1%, nonionic guar gum 2.5%,
Sodium chloride 1%, Ammonium Persulfate 98.5 0.1%, hydrochloric acid 0.1% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium chloride, Ammonium Persulfate 98.5 and hydrochloric acid, stir 2h at 75 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Embodiment 7
The embodiment of the present invention 7 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 10%, polyacrylamide emulsion 30%, cationic starch with high substitution degree 12%, diatomite 3%, nonionic guar gum 2%, sulphur
Sour sodium 1.5%, potassium peroxydisulfate 0.6%, hydrochloric acid 0.3% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium sulphate, potassium peroxydisulfate and hydrochloric acid, stir 2h at 75 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Embodiment 8
The embodiment of the present invention 8 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soybean protein
Powder 15%, polyacrylamide emulsion 20%, cationic starch with high substitution degree 17%, diatomite 3%, nonionic guar gum 2%, sulphur
Sour sodium 1.5%, potassium peroxydisulfate 0.6%, hydrochloric acid 0.3% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, and soyabean protein powder and diatomite is then added, stirs evenly, and then proceedes to add
Enter nonionic guar gum, sodium sulphate, potassium peroxydisulfate and hydrochloric acid, stir 2h at 75 DEG C, be finally cooled to room temperature, is made described and makes
Paper drying strengthening agent.
Comparative example 1
Comparative example 1 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: polyacrylamide emulsion
32.5%, cationic starch with high substitution degree 19.5%, diatomite 3%, nonionic guar gum 2%, sodium sulphate 1.5%, persulfuric acid
Potassium 0.6%, hydrochloric acid 0.3% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent, include the following steps: by polyacrylamide emulsion and high substituted degree sun from
Sub- starch is added in deionized water, stirs evenly, diatomite is then added, stir evenly, and then proceedes to that nonionic Guar is added
Glue, sodium sulphate, potassium peroxydisulfate and hydrochloric acid stir 2h at 75 DEG C, are finally cooled to room temperature, and the papermaking dry-strengthening agent is made.
Comparative example 2
Comparative example 2 provides a kind of papermaking dry-strengthening agent, by forming following weight percentage components: soyabean protein powder
17%, polyacrylamide emulsion 35%, diatomite 3%, nonionic guar gum 2%, sodium sulphate 1.5%, potassium peroxydisulfate 0.6%,
Hydrochloric acid 0.3% and deionized water surplus.
The preparation method of the papermaking dry-strengthening agent includes the following steps: for polyacrylamide emulsion to be added in deionized water,
Stir evenly, soyabean protein powder and diatomite be then added, stirs evenly, then proceed to be added nonionic guar gum, sodium sulphate,
Potassium peroxydisulfate and hydrochloric acid stir 2h at 75 DEG C, are finally cooled to room temperature, and the papermaking dry-strengthening agent is made.
Effect example
The papermaking dry-strengthening agent of testing example 1~8 and comparative example 1~2 is to the reinforcing effect of paper, while with commercially available poly-
Acrylamide drying strengthening agent (i.e. drying strengthening agent A) is as control.
Method: papermaking dry-strengthening agent is wet end addition, and dosage 15kg/t is tested and used reclaimed waste paper, and waste paper passes through
The processes such as mill paddle are made certain density paper paddle and use, and use Recirculating white water handsheet (the tiny fibre of laboratory plain boiled water in laboratory
Dimension hplc about 0.13%, PCD is -487ueq/L, and the conductivity of plain boiled water is 2800us/cm).Finally paper obtained is surveyed
It tries (measurement of testing standard GB/T 24323-2009 paper pulp laboratory page physical property), the results are shown in Table 1.
1 strengthening for paper effect of table
It can be seen that from the result of table 1, the papermaking dry-strengthening agent of the embodiment of the present invention 1~8 can significantly improve the physics of paper
The retention of fiber and filler in performance and slurry, it is especially optimal with the effect of embodiment 1, followed by embodiment 2 and implement
Example 3, therefore, the present invention is using the formula of embodiment 1 as being most preferably formulated.In addition, can be seen that from the result of embodiment, soybean egg
White powder: polyacrylamide emulsion: when cationic starch with high substitution degree=10~14:22~28:12~16 (mass ratio), papermaking is dry
The reinforcing effect of strong agent is more excellent, and soyabean protein powder: polyacrylamide emulsion: cationic starch with high substitution degree=12:25:15
When (mass ratio), the reinforcing effect of papermaking dry-strengthening agent is optimal.
Comparing embodiment 1 and comparative example 1~2 are it is found that soyabean protein powder, polyacrylamide emulsion and high substituted degree cation
Starch is compounded with inventive formulation, has synergistic function in terms of strengthening for paper, so that the paper of papermaking dry-strengthening agent be made to increase
Potent fruit is more preferable.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (10)
1. a kind of papermaking dry-strengthening agent, which is characterized in that by forming following weight percentage components: soyabean protein powder 8%~
15%, polyacrylamide emulsion 20%~30%, cationic starch with high substitution degree 10%~20%, diatomite 0.5%~5%,
Nonionic guar gum 0.5%~3%, anti-crosslinking agent 0.5%~2%, multiplex catalyst 0.1%~1%, pH adjusting agent
0.05%~0.5% and deionized water surplus.
2. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the soyabean protein powder, polyacrylamide emulsion and
The mass ratio of cationic starch with high substitution degree is soyabean protein powder: polyacrylamide emulsion: cationic starch with high substitution degree=
10~14:22~28:12~16.
3. papermaking dry-strengthening agent as claimed in claim 2, which is characterized in that the soyabean protein powder, polyacrylamide emulsion and
The mass ratio of cationic starch with high substitution degree is soyabean protein powder: polyacrylamide emulsion: cationic starch with high substitution degree=
12:25:15。
4. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the papermaking dry-strengthening agent is by following weight percent
Group is grouped as: soyabean protein powder 10%~14%, polyacrylamide emulsion 22%~28%, cationic starch with high substitution degree 12%
~16%, diatomite 2%~4%, nonionic guar gum 1%~3%, anti-crosslinking agent 1%~2%, multiplex catalyst
0.4%~0.8%, pH adjusting agent 0.1%~0.4% and deionized water surplus.
5. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the papermaking dry-strengthening agent is by following weight percent
Group is grouped as: soyabean protein powder 12%, polyacrylamide emulsion 25%, cationic starch with high substitution degree 15%, diatomite 3%,
More than nonionic guar gum 2%, anti-crosslinking agent 1.5%, multiplex catalyst 0.6%, pH adjusting agent 0.3% and deionized water
Amount.
6. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the degree of substitution of the cationic starch with high substitution degree is
0.2~0.3.
7. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the anti-crosslinking agent includes sodium sulphate, in sodium chloride
At least one.
8. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the multiplex catalyst include potassium peroxydisulfate,
At least one of Ammonium Persulfate 98.5.
9. papermaking dry-strengthening agent as described in claim 1, which is characterized in that the pH adjusting agent is hydrochloric acid, sulfuric acid, acetic acid, second
At least one of acid, citric acid.
10. the preparation method of papermaking dry-strengthening agent as described in any one of claims 1 to 9, which is characterized in that including walking as follows
It is rapid: polyacrylamide emulsion and cationic starch with high substitution degree being added in deionized water, stirred evenly, soybean egg is then added
White powder and diatomite, stir evenly, and then proceed to that nonionic guar gum, anti-crosslinking agent, multiplex catalyst and pH tune is added
Agent is saved, 1~2h is stirred at 70~80 DEG C, room temperature is finally cooled to, the papermaking dry-strengthening agent is made.
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