阅读说明：本技术 一种防潮包装纸表面施胶液组合物及制备方法 (Moisture-proof packaging paper surface sizing liquid composition and preparation method thereof ) 是由 李丹 朱宏伟 吴恒 刘春景 周金涛 于 2020-06-06 设计创作，主要内容包括：本发明公开了一种防潮包装纸表面施胶液组合物,属于造纸技术领域,其组分以质量份数计：玉米淀粉100～150份、聚乙烯醇50～100份、抗水剂5～10份、淀粉酶0.01～0.02份、椰壳粉20～50份；还公开了一种防潮包装纸表面施胶液组合物的制备方法,该方法不仅回收了废弃的椰子壳,避免了资源浪费,节约成本,且通过制备的表面施胶液组合物对包装纸进行施胶使纸具有很好的防潮性,满足了食品包装纸对防潮性的要求。(The invention discloses a surface sizing liquid composition for moistureproof packaging paper, which belongs to the technical field of papermaking and comprises the following components in parts by mass: 100-150 parts of corn starch, 50-100 parts of polyvinyl alcohol, 5-10 parts of a water repellent agent, 0.01-0.02 part of amylase and 20-50 parts of coconut shell powder; the method not only recovers the waste coconut shells, avoids resource waste and saves cost, but also enables the paper to have good moisture resistance by applying the prepared surface sizing liquid composition to the packaging paper, and meets the requirement of the food packaging paper on the moisture resistance.)

1. The moisture-proof packaging paper surface sizing liquid composition is characterized by comprising the following components in parts by mass: 100-150 parts of corn starch, 50-100 parts of polyvinyl alcohol, 5-10 parts of a water repellent agent, 0.01-0.02 part of amylase and 20-50 parts of coconut shell powder.

2. The moisture resistant wrapping paper surface sizing composition as defined in claim 1, wherein said corn starch is industrial corn starch.

3. The moisture-proof wrapping paper surface sizing solution composition as claimed in claim 1, wherein the polymerization degree of the polyvinyl alcohol is 400-600, and the alcoholysis degree is 50-88%.

4. The moisture resistant wrapper paper surface sizing composition as defined in claim 1, wherein said water-repellent agent is a polyamide polyurea polymer oligomer; the amylase is an alpha-amylase.

5. The surface sizing liquid composition for the moisture-proof wrapping paper as claimed in claim 1, wherein the coconut husk powder is prepared by the following specific steps: crushing the waste coconut shells for 10-20 min by using a double-roller crusher, crushing by using a ball-milling crushing device for 20-50 min, and sieving by using a 450-500-mesh sieve to obtain the coconut shell powder.

6. The surface sizing liquid composition for the moisture-proof wrapping paper as claimed in claim 5, wherein the obtained coconut husk powder is bleached by hydrogen peroxide, then is put into washing equipment for washing, and is dehydrated and dried to obtain the coconut husk powder.

7. The surface sizing agent composition for the moisture-proof wrapping paper as claimed in claim 6, wherein the hydrogen peroxide is added in an amount of 2-5% by mass based on the weight of the coconut shell powder, the whiteness of the coconut shell powder is controlled to be 25-30% ISO, the drying temperature is 100-120 ℃, and the drying time is 50-80 min.

8. The preparation method of the moisture-proof wrapping paper surface sizing agent composition according to any one of claims 1-7, characterized by taking corn starch as a raw material, adding water into the corn starch in parts by mass to prepare a starch suspension with the mass concentration of 0.3-0.5 g/mL, adding the polyvinyl alcohol, the water-resistant agent, the amylase and the coconut shell powder in parts by mass, uniformly stirring, heating to 90-95 ℃, keeping the temperature for 20-40 min, adding water to dilute to the solid content of 10-15%, and finally uniformly mixing to obtain the moisture-proof wrapping paper surface sizing agent composition, wherein the pH value of the composition is 6-9, and the viscosity is 30-50 mpa.s.

Technical Field

The invention belongs to the technical field of papermaking, and particularly relates to a moisture-proof wrapping paper surface sizing liquid composition and a preparation method thereof.

Background

With the improvement of the technical level of the paper industry, the surface sizing of paper has become a conventional paper processing procedure, and especially in recent years, the development of printing technology has made higher requirements on the surface performance and the surface strength of cultural paper and packaging paper, so that the paper industry is continuously seeking new surface sizing technology.

Surface sizing is a process in the production process of paper making, and is usually positioned at the tail end of a drying part of a paper machine, so that a layer of glue solution is sprayed when paper sheets are not completely dried but have certain strength, and a layer of glue film is formed on the surfaces of paper and paper boards through subsequent drying, thereby achieving the purpose of changing the surface performance of the paper or the paper boards.

The packaging paper is generally made from sulfate softwood pulp serving as a raw material on a fourdrinier papermaking machine after pulping, is tough in texture, high in strength and tawny in paper surface, and has a quantitative range of 60-120 g/m². The main quality requirements of the packing paper are that the packing paper has very high tension, is flexible and firm, has high bursting strength, can bear larger tension and pressure without breaking, and the kraft paper has the advantage of tensile resistance so that the packing paper is very suitable for the requirement of packing. The packaging paper has the characteristics of environmental protection, recycling, cost saving and the like, and does not cause pollution to the environment compared with other packaging materials. With the increasing requirement of the whole international market on the environmental protection of the packing materials, more and more packing printing industries select packing paper with high strength as a preferred packing material. The packaging paper is widely applied to various packaging materials such as cement bag paper, paper bag paper, file bag paper, food packaging paper and the like.

The wrapping paper generally has high strength and toughness, and is classified into general wrapping paper, special wrapping paper, trademark paper, oil-proof wrapping paper, moisture-proof wrapping paper, and the like according to the purpose and use of the wrapping paper. Each type of wrapper has different properties and uses. The common packaging paper is mostly used for packaging common commodities, and the quality requirement is not strict; the special fruit wrapping paper is thin and soft; the photosensitive protective paper is light-tight; the oil-proof packaging paper is required to have oil and grease penetration resistance; moisture-proof wrapping paper is required to have moisture-proof properties. In recent years, with the vigorous development of electric power merchants, the demand of food packaging paper is increased rapidly, and the common packaging paper has insufficient waterproof and moistureproof functions and is difficult to meet the requirements of food packaging.

In the south, coconut is a common fruit, and coconut shells left after coconut juice is drunk are garbage which is large in size and difficult to treat, and the coconut shells bring problems to garbage treatment and waste of resources, so that how to recycle the coconut shells is a problem to be solved urgently at present.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide the surface sizing agent composition for the moisture-proof wrapping paper and the preparation method thereof.

In order to realize the purpose, the invention adopts the technical scheme that:

the moisture-proof wrapping paper surface sizing liquid composition comprises the following components in parts by mass: 100-150 parts of corn starch, 50-100 parts of polyvinyl alcohol, 5-10 parts of a water repellent agent, 0.01-0.02 part of amylase and 20-50 parts of coconut shell powder.

Further, the corn starch is industrial corn starch.

Further, the polymerization degree of the polyvinyl alcohol is 400-600, and the alcoholysis degree is 50-88%.

Further, the water repellent agent is polyamide polyurea high molecular oligomer; the amylase is an alpha-amylase.

Further, the specific preparation process of the coconut husk powder comprises the following steps: crushing the waste coconut shells for 10-20 min by using a double-roller crusher, crushing by using a ball-milling crushing device for 20-50 min, and sieving by using a 450-500-mesh sieve to obtain the coconut shell powder.

Further, bleaching the obtained coconut shell powder by using hydrogen peroxide, washing the bleached coconut shell powder in washing equipment, and dehydrating and drying the washed coconut shell powder to obtain the coconut shell powder.

Furthermore, the adding amount of the hydrogen peroxide is 2-5% of the weight of the coconut shell powder, the whiteness of the coconut shell powder is controlled to be 25-30% ISO, the drying temperature is 100-120 ℃, and the drying time is 50-80 min.

A preparation method of a moisture-proof packaging paper surface sizing liquid composition comprises the steps of taking corn starch as a raw material, adding water into the corn starch in parts by mass to prepare a starch suspension liquid with the mass concentration of 0.3-0.5 g/mL, adding polyvinyl alcohol, a water repellent agent, amylase and coconut shell powder in parts by mass, uniformly stirring, heating to 90-95 ℃, keeping the temperature for 20-40 min, adding water to dilute the mixture until the solid content is 10-15%, and finally uniformly mixing to obtain the moisture-proof packaging paper surface sizing liquid composition, wherein the pH value of the composition is 6-9, and the viscosity is 30-50 mpa.s.

The invention has the beneficial effects that: (1) the invention provides a moisture-proof wrapping paper surface sizing agent composition and a preparation method thereof, the method not only recycles waste coconut shells, avoids resource waste and saves cost, but also enables the wrapping paper to have good moisture resistance by sizing the prepared surface sizing agent composition, and meets the requirement of food wrapping paper on moisture resistance;

(2) the existing moisture-proof packaging paper needs small air permeability, has certain water resistance and also has certain water vapor isolation capacity, the water-resistant agent added in the invention is only used for isolating water from the surface, and cannot isolate the water vapor from the microcosmic air, so the invention also adds the coconut husk powder, the length of the coconut husk fiber is 10-25 cm, and the density is 1.12cm³The long fiber with a multicellular aggregation structure is a long fiber which does not belong to needle leaves or broad leaves, is used for surface sizing of packaging paper, is combined with a common fine fiber slurry raw material of the packaging paper, and can form pores with different sizes due to different fiber lengths and densities, so that the prepared packaging paper has high air permeability, and water vapor in air is easy to permeate, so that the moisture resistance of the packaging paper is poor;

(3) the surface sizing liquid composition adopted by the invention has a simple preparation method, the surface sizing mode can adopt roller type or metering rod type sizing and pressing treatment, special treatment equipment such as pigment dispersion, paint preparation, coating and the like is not needed, and the production process is simplified.

Detailed Description

For a better understanding of the present invention, embodiments of the present invention are described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.