阅读说明：本技术 一种造纸用的粉末化学助剂 (Powdered chemical assistant for papermaking ) 是由 是小昌 于 2020-12-08 设计创作，主要内容包括：本发明提供了一种造纸用的粉末化学助剂,该化学助剂由如下重量份的原料制成：双醛淀粉20-30份,三甲基氨氯酰肼3-5份,玻璃纤维20-25份,纳米二氧化硅1-2份,助留剂20-30份。本发明含有膨润土助留剂以及改性的双醛淀粉,不仅使得该助留剂在使用后能够有效保留纸张内部的细小纤维、填料、湿部化学助剂,改善成纸均匀度,而且该纸张能够在提高纸张的干湿强度的同时延长纸张的保存期,极大的确保了成纸的质量。(The invention provides a powdery chemical additive for papermaking, which is prepared from the following raw materials in parts by weight: 20-30 parts of dialdehyde starch, 3-5 parts of trimethyl amlodipine hydrazide, 20-25 parts of glass fiber, 1-2 parts of nano silicon dioxide and 20-30 parts of retention aid. The bentonite retention aid and the modified dialdehyde starch are contained, so that the retention aid can effectively retain fine fibers, fillers and wet-end chemical additives in paper after being used, the uniformity of finished paper is improved, the dry and wet strength of the paper can be improved, the storage life of the paper is prolonged, and the quality of the finished paper is greatly ensured.)

1. A powder chemical additive for papermaking is characterized in that: the chemical auxiliary agent is prepared from the following raw materials in parts by weight: 20-30 parts of dialdehyde starch, 3-5 parts of trimethyl amlodipine hydrazide, 20-25 parts of glass fiber, 1-2 parts of nano silicon dioxide and 20-30 parts of retention aid.

2. Chemical adjuvant according to claim 1, characterized in that: the retention aid is a BT-302 type bentonite retention aid, and the glass fiber is alkali-free glass fiber.

3. Chemical adjuvant according to claim 1, characterized in that: the dialdehyde starch, the trimethyl amlodipine hydrazide, the glass fiber, the nano silicon dioxide and the retention aid are powdery substances.

4. A method of using a chemical adjuvant according to any of claims 1 to 3, characterised in that: the method comprises the following steps:

step (1): sequentially adding dialdehyde starch and trimethylamlodipine hydrazide into the aqueous solution, and fully heating and stirring, wherein the heating temperature is maintained at 90-100 ℃ to prepare a positive dialdehyde starch solution for later use;

step (2): sequentially adding glass fiber and nano silicon dioxide agent into the solution prepared in the step (1) and fully stirring;

and (3): and (3) adding the retention aid into the solution prepared in the step (2) again until the solution is in a uniform paste state, and uniformly paving the solution in each layer of paper pulp by using an external variable frequency screw pump so as to put the chemical aid into use.

5. The method of using a chemical adjuvant according to claim 4, wherein: the stirring time in the step (1) is 10-15 minutes.

Technical Field

The invention belongs to the technical field of chemical additives for papermaking, and particularly relates to a powdery chemical additive for papermaking.

Background

Papermaking aids are auxiliary chemicals added during the pulping process to impart certain properties to the process and product. The papermaking auxiliary agent plays an important role in the modern papermaking industrial production, particularly in the aspects of improving the quality and increasing the variety.

However, the existing papermaking auxiliary agents can only singly enhance the dry strength and the wet strength of paper in the using process, so that the paper forming uniformity and the dry and wet strength of the paper are poor, and the paper forming quality of the paper is reduced.

Disclosure of Invention

In view of the above, the present invention is directed to a powdered chemical assistant for papermaking, which contains a bentonite retention aid and modified dialdehyde starch, so that the retention aid can effectively retain fine fibers, fillers and wet chemical assistants inside paper after use, and improve the uniformity of finished paper, and the paper can improve the dry and wet strength of paper and prolong the storage life of paper, thereby greatly ensuring the quality of finished paper.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a powdered chemical assistant for papermaking is prepared from the following raw materials in parts by weight: 20-30 parts of dialdehyde starch, 3-5 parts of trimethyl amlodipine hydrazide, 20-25 parts of glass fiber, 1-2 parts of nano silicon dioxide and 20-30 parts of retention aid.

Further, the retention aid is a BT-302 type bentonite retention aid, and the glass fiber is alkali-free glass fiber.

Furthermore, the dialdehyde starch, the trimethyl amlodipine hydrazide, the glass fiber, the nano silicon dioxide and the retention aid are powdery substances, the dialdehyde starch can improve the dry and wet strength of paper and simultaneously prolong the storage life of the paper, the glass fiber and the nano silicon dioxide can effectively enhance the strength of the paper, and the retention aid can effectively retain fine fibers, fillers and wet chemical auxiliaries in the paper, so that the uniformity of finished paper and the physical properties of the paper are improved.

Furthermore, the dialdehyde starch is modified starch, the modified starch has short molecular chain, contains certain free hydroxyl and substituent groups, has strong film forming capability, low viscosity and good fluidity, and particularly the cationic starch also has positive charges, and the surfaces of particles such as raw material fiber fillers and dyes for forming paper have negative charges; adding starch into paper pulp can effectively promote fine fibers, fillers and other material particles to form flocculent, also can enable starch chain molecules and cellulose molecules to form aggregates through hydrogen bond connection or through the electrostatic action of positive and negative charges, and reduce the hydrophilic capacity of the fibers, so that the forming process of paper sheets is beneficial to improving the water filtering speed of the paper pulp and forming a compact fiber layer, plays a role in filter aid and retention aid, and improves the water resistance of the paper sheets; meanwhile, the modified starch is filled in gaps among fibers, plays a role in bridging among the fibers, and improves the strength of paper by improving the bonding force among the fibers.

The use method of the chemical auxiliary agent comprises the following steps:

step (1): sequentially adding dialdehyde starch and trimethylamlodipine hydrazide into the aqueous solution, and fully heating and stirring, wherein the heating temperature is maintained at 90-100 ℃ to prepare a positive dialdehyde starch solution for later use;

step (2): sequentially adding glass fiber and nano silicon dioxide agent into the solution prepared in the step (1) and fully stirring;

and (3): and (3) adding the retention aid into the solution prepared in the step (2) again until the solution is in a uniform paste state, and uniformly paving the solution in each layer of paper pulp by using an external variable frequency screw pump so as to put the chemical aid into use.

Further, the stirring time in the step (1) is 10-15 minutes, so that the double-full starch can be fully stirred in the using process.

Compared with the prior art, the chemical auxiliary agent disclosed by the invention has the following advantages:

the bentonite retention aid and the modified dialdehyde starch are contained, so that the retention aid can effectively retain fine fibers, fillers and wet-end chemical additives in paper after being used, the uniformity of finished paper is improved, the dry and wet strength of the paper can be improved, the storage life of the paper is prolonged, and the quality of the finished paper is greatly ensured.

Detailed Description

Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs.

The present invention will be described in detail below.

A powdered chemical assistant for papermaking is prepared from the following raw materials in parts by weight: 20-30 parts of dialdehyde starch, 3-5 parts of trimethyl amlodipine hydrazide, 20-25 parts of glass fiber, 1-2 parts of nano silicon dioxide and 20-30 parts of retention aid.

In this embodiment, the retention aid is a BT-302 type bentonite retention aid, and the glass fiber is an alkali-free glass fiber.

In this embodiment, the dialdehyde starch, the trimethylamlodipine hydrazide, the glass fiber, the nano-silica and the retention aid are all powdery substances, the dialdehyde starch can improve the dry and wet strength of paper and simultaneously prolong the storage life of the paper, the glass fiber and the nano-silica can effectively enhance the strength of the paper, and the retention aid can effectively retain fine fibers, fillers and wet chemical auxiliaries in the paper, so as to improve the uniformity of finished paper and the physical properties of the paper.

In the embodiment, the dialdehyde starch is modified starch, the modified starch has short molecular chain, contains certain free hydroxyl and substituent groups, has strong film forming capability, low viscosity and good fluidity, particularly the cationic starch also has positive charge, and the surfaces of particles such as raw material fiber fillers and dyes for forming paper have negative charge; adding starch into paper pulp can effectively promote fine fibers, fillers and other material particles to form flocculent, also can enable starch chain molecules and cellulose molecules to form aggregates through hydrogen bond connection or through the electrostatic action of positive and negative charges, and reduce the hydrophilic capacity of the fibers, so that the forming process of paper sheets is beneficial to improving the water filtering speed of the paper pulp and forming a compact fiber layer, plays a role in filter aid and retention aid, and improves the water resistance of the paper sheets; meanwhile, the modified starch is filled in gaps among fibers, plays a role in bridging among the fibers, and improves the strength of paper by improving the bonding force among the fibers.

The use method of the chemical auxiliary agent comprises the following steps:

step (1): sequentially adding dialdehyde starch and trimethylamlodipine hydrazide into the aqueous solution, and fully heating and stirring, wherein the heating temperature is maintained at 90-100 ℃ to prepare a positive dialdehyde starch solution for later use;

step (2): sequentially adding glass fiber and nano silicon dioxide agent into the solution prepared in the step (1) and fully stirring;

and (3): and (3) adding the retention aid into the solution prepared in the step (2) again until the solution is in a uniform paste state, and uniformly paving the solution in each layer of paper pulp by using an external variable frequency screw pump so as to put the chemical aid into use.

In this embodiment, the stirring time in the step (1) is 10 to 15 minutes, so that the double-full starch can be sufficiently stirred in the using process.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.