阅读说明：本技术 一种瓦楞纸板粘合剂 (Corrugated board adhesive ) 是由 刘少富 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种瓦楞纸板粘合剂,其中固体物质的质量含量为25％-30％,所述固体物质包括按质量百分含量计量的以下成分：木薯淀粉80％、烧碱4％、硼砂1％、安定剂1％、渗透剂8％、消泡剂1％和固化剂5％。本发明所述的粘合剂具有高渗透性和高粘接性,可减小胶线宽度、提高粘接强度,降低粘合剂用量,缓解了宽胶线带来的纸板显楞问题。增强粘合剂渗透弥散到纸张内部的能力,提升内部结合度促进湿态的粘合快速固化干燥粘结,形成强的表面黏合,整个配方粘合剂用量少、糊化温度低、生产车速快。(The invention discloses a corrugated board adhesive, wherein the mass content of solid matters is 25-30%, and the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent. The adhesive has high permeability and high adhesiveness, can reduce the width of adhesive lines, improve the adhesive strength, reduce the using amount of the adhesive and relieve the problem of paperboard corrugation caused by wide adhesive lines. The capability of the adhesive to penetrate and disperse into the paper is enhanced, the internal combination degree is improved, the wet-state adhesion, rapid curing and drying adhesion are promoted, strong surface adhesion is formed, the using amount of the adhesive in the whole formula is small, the gelatinization temperature is low, and the production speed is high.)

1. The corrugated board adhesive is characterized in that the mass content of solid matters in the adhesive is 25-30%, and the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

2. Corrugated board adhesive according to claim 1, characterised in that the mass content of solid matter in the adhesive is 25%, which solid matter comprises the following components, measured in mass percentages: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

3. Corrugated cardboard binder according to claim 1, characterised in that the binder has a mass content of 28% of solid matter comprising the following components in mass percent: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

4. Corrugated cardboard binder according to claim 1, characterised in that the binder has a mass content of solid matter of 30%, which solid matter comprises the following constituents in mass percent: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

5. The corrugated cardboard binder as claimed in any one of claims 1 to 4, wherein the tapioca starch has a water content of not more than 14%, the grain size of the starch is 98-100 mesh, and the protein content of the starch is less than 0.4% by mass.

6. Corrugated board adhesive according to any one of claims 1 to 4, characterised in that the purity of the caustic soda is 97-99%.

7. Corrugated cardboard binder according to any of claims 1 to 4, characterised in that the curing agent has Na as the main component₂B₄O₇·10H₂O。

Technical Field

The present invention relates to an adhesive, and more particularly, to an adhesive for corrugated cardboards.

Background

The main components of the corrugated board adhesive are starch, caustic soda, borax and additives. In the cardboard industry, corn starch or tapioca starch is basically used, and the two starches have good and bad properties. The corn starch is characterized by high gelatinization temperature (60-62 ℃), slow viscosity generation (small particles with average size of 20 microns), and viscosity generation only after expansion to a certain degree. And meanwhile, the drying speed is slow, and the viscosity and the sticking capability are weak. The cassava starch has better performance than the corn starch, but the cassava starch material has high unit price, and the use cost is high if the dosage of the adhesive cannot be obviously reduced.

CN108659736A discloses a novel corrugated board adhesive and a preparation method thereof. It is prepared from cassava starch, borax, caustic soda, water, adhesive, penetrant and aluminum sulfate through mixing, copolymerization and dissolution in carrier tank and main tank. The corrugated board adhesive prepared by the technical scheme has insufficient capability of permeating and dispersing into paper, so that the width of an adhesive line is too large, and the adhesive strength of the corrugated board is still to be improved.

Disclosure of Invention

The invention overcomes the defects of the prior art, and provides an implementation mode of the corrugated board adhesive, so that the problems of the corrugated board and the like caused by low bonding strength, poor permeation and dispersion performance, overlarge glue line width and the like of the adhesive can be solved.

In order to solve the technical problem, the invention provides a technical scheme that: the adhesive for the corrugated boards comprises 25-30% of solid matters, wherein the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

The non-solid matter in the corrugated board adhesive may be, in addition to solid matter, water, such as 70% to 75% water.

The invention also provides the following technical scheme: the mass content of solid matters in the adhesive is 25 percent, and the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

The invention also provides the following technical scheme: the mass content of solid matters in the adhesive is 28 percent, and the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

The invention also provides the following technical scheme: the mass content of solid matters in the adhesive is 30 percent, and the solid matters comprise the following components in percentage by mass: 80% of cassava starch, 4% of caustic soda, 1% of borax, 1% of a stabilizer, 8% of a penetrating agent, 1% of a defoaming agent and 5% of a curing agent.

In the corrugated board adhesive, the water content of the cassava starch is less than or equal to 14 percent, the grain mesh number of the starch is 98-100 meshes, and the protein mass content of the starch is less than 0.4 percent.

In the corrugated board adhesive, the purity of caustic soda is 97-99%.

In the corrugated board adhesive, the main component of the curing agent is Na₂B₄O₇·10H₂O。

The technical solution of the present invention is further explained below.

The cassava starch is the main body of biochemical reaction, and the dosage of the cassava starch reaches more than 70% of the mass of solid matters, so the quality of the adhesive has a direct relation with the mass and dosage of the starch. The moisture content, fineness and protein of the starch are all main factors influencing the quality of the glue. In order to obtain good bonding performance, the invention adopts cassava starch with the water content not higher than 14%, the mesh number of 98-100 meshes and the protein mass content of less than 0.4%.

Caustic soda is an oxidant, plays a role in gelatinization and is capable of wetting softened paper boards. The purity of the caustic soda has an influence on the capability of the caustic soda to infiltrate and soften the paper board, and researches show that the capability of the caustic soda to infiltrate and soften the paper board is higher when the purity of the caustic soda reaches 97-99%.

Borax plays a role in complexing and thickening, and the dosage of borax influences the cohesive force of the adhesive.

The stabilizer stabilizes the adhesive properties so that the adhesive is not emulsified.

The anti-foaming agent can reduce foaming caused by too high a protein content in the binder.

The penetrating agent can promote the adhesive to penetrate into the corrugated board, reduce the line width and prevent the corrugated board at the gluing part from being corrugated. When the amount of the penetrant is small, the penetrant can promote penetration to some extent, but the line width cannot be obviously reduced, and the paperboard is prevented from being corrugated.

Sodium tetraborate Na₂B₄O₇·10H₂The O curing agent can promote the wet adhesive to be quickly cured, dried and bonded to form strong surface adhesion.

The invention uses 8% penetrant and 5% curing agent in the solid component of the corrugated board adhesive, the amount of the penetrant is about 8 times of CN108659736A, so that the adhesive has high permeability, the technical proposal that sodium tetraborate is used as the curing agent and added into the adhesive is not seen in the industry, and the amount of the sodium tetraborate is about 5%, so that the adhesive has high adhesive property, under the combined action of the penetrant and the curing agent, the adhesive has enough time and speed to permeate into the corrugated board in the using process, the line width of the adhesive is reduced, the corrugation is prevented from being formed, and the adhesive with high adhesive property can ensure that the corrugated board is well adhered under the condition of small amount, so that the amount of the adhesive is reduced.

Compared with the prior art, the invention has at least the following beneficial effects:

The adhesive disclosed by the invention has high permeability and high adhesiveness, the width of a glue line can be reduced, the using amount of the adhesive is reduced, the adhesive strength of a paperboard is ensured and improved by 5-8%, and the problem of paperboard corrugation development caused by wide glue lines is relieved. The capability of the adhesive to penetrate and disperse into the paper is enhanced, the internal combination degree is improved, the wet-state adhesion, rapid curing and drying adhesion are promoted, strong surface adhesion is formed, the using amount of the adhesive in the whole formula is small (low consumption), the gelatinization temperature is low (room temperature), and the production speed is high (high speed).

Drawings

Fig. 1 is a schematic view showing a state of penetration of an adhesive on a corrugated cardboard.

In the figure, a is shallow penetration and b is penetration.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The solid starting materials used in the examples meet the following requirements:

The curing agent is: na (Na)₂B₄O₇·10H₂O；

The penetrant is sodium sulfamate, sodium alkyl benzene sulfonate or fatty alcohol-polyoxyethylene ether.

The defoaming agent is octyl phenol polyethenoxy ether or organic silicon defoaming agent.

The stabilizer is SB-100 which is a special stabilizer for corrugated boards.

The purity of the caustic soda is 98%.

The water content of the cassava starch is about 10 percent, the grain mesh number of the starch is 98-100 meshes, and the protein content of the starch is about 0.2 percent.