阅读说明：本技术 一种防霉抗菌白卡纸及其加工工艺 (Mildew-proof antibacterial white cardboard and processing technology thereof ) 是由 李树伟 李建强 于 2018-09-11 设计创作，主要内容包括：本发明白卡纸加工技术领域,具体涉及一种防霉抗菌白卡纸,包括原纸和涂布层,所述涂布层包括如下重量份的原料组分：纳米碳酸钙50-80份,微晶纤维素1-5份,桃胶30-50份,葡萄柚种子提取物0.5-3份,分散剂0.1-0.5份和消泡剂1-3份,还提供了该白卡纸的加工工艺；利用纯天然植物作为抗菌组分,复配得到涂布层涂布于面层与底层表面,不仅具有抗菌的作用,而且天然无公害,对人体不存在潜在的危害；该涂布层还提高了纸基的防潮性能,有效的避免了受潮霉变的问题。(The invention belongs to the technical field of white cardboard processing, and particularly relates to a mildew-proof antibacterial white cardboard which comprises base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent, and also provides a processing technology of the white cardboard; pure natural plants are used as antibacterial components, and the coating layers are obtained by compounding and coated on the surfaces of the surface layer and the bottom layer, so that the coating has an antibacterial effect, is natural and pollution-free, and has no potential harm to human bodies; the coating layer also improves the moisture resistance of the paper base and effectively avoids the problem of wetting and mildewing.)

1. The mildew-proof antibacterial white cardboard is characterized by comprising base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent.

2. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the coating layer comprises the following raw material components in parts by weight: 60-70 parts of nano calcium carbonate, 2-4 parts of microcrystalline cellulose, 35-45 parts of peach gum, 1-2 parts of grapefruit seed extract, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent.

3. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the coating layer also comprises 1-5 parts of silica gel powder.

4. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the base paper comprises a surface layer, a core layer and a bottom layer, wherein the surface layer has the quantitative weight of 25-35g/m²The bottom layer has a quantitative content of 23-33 g/m²。

5. The mildew-proof antibacterial ivory board as claimed in claim 4, wherein the core layer comprises the following raw material components in parts by weight: 300 parts of bleached chemithermomechanical pulp and 130 parts of bleached willow wood pulp.

6. The mildew-proof antibacterial white cardboard according to claim 4, wherein the surface layer comprises the following raw material components in parts by weight: 80-90 parts of bleached hardwood pulp and 10-25 parts of bleached softwood pulp.

7. The mildew-proof antibacterial white cardboard according to claim 4, wherein the bottom layer comprises the following raw material components in parts by weight: 70-80 parts of bleached hardwood pulp and 20-35 parts of bleached softwood pulp.

8. A processing technology of the mildew-proof antibacterial ivory board according to any one of claims 4-7 is characterized by comprising the following operation steps:

(1) obtaining surface pulp, core pulp and bottom pulp by pulping and jordaning;

(2) respectively making the surface pulp, the core pulp and the bottom pulp to obtain wet paper sheets with a surface layer, a core layer and a bottom layer, and sequentially squeezing and drying the wet paper sheets to obtain base paper;

(3) uniformly coating the surface layer and the bottom layer of the base paper with the coating layer, and then sequentially performing calendaring, drying, cooling, reeling and rewinding to obtain the mildew-proof antibacterial white cardboard.

9. The processing technology of the mildew-proof antibacterial white cardboard according to claim 8, characterized in that: in the step (3), after drying until the moisture content of the base paper is 5.0-6.5%, cooling operation is carried out.

10. The processing technology of the mildew-proof antibacterial white cardboard according to claim 8, characterized in that: the coating layer is coated by a surface scraper, and the coating weight is 10-12g/m²。

Technical Field

The invention relates to the technical field of white cardboard processing, in particular to a mildew-proof antibacterial white cardboard and a processing technology thereof.

Background

The white cardboard is a kind of white cardboard made of thick, solid and high-quality wood pulp, and is mainly used for packaging and decorating printing stock after being calendered or embossed. Classified according to the application, there are special papers, such as single-coated white cardboard for cigarette packaging, called cigarette card, uncoated base paper for liquid food packaging, called liquid food wrapping paper, various anti-counterfeit label papers, etc. Others are coated white cardboard used for packaging various goods, such as wine bottles, cosmetics, pharmaceuticals, health products, chocolate or dessert products, dry food, frozen or frozen food, tea, coffee, clothing, toys, paintings and calligraphy, game pieces, photographic products, etc. However, whatever the product used for printing, there is a characteristic of frequent direct contact with humans. If the paper base is not subjected to antibacterial treatment, the paper base is polluted by various bacteria and fungi in the processes of printing processing, circulation, sale, use and the like, and once a contact person touches the paper base, the paper base is easily infected, various diseases are caused, and the health of people is influenced.

The time required for the organic antibacterial material to exert the antibacterial action is shorter, namely the immediate effect is good, but the antibacterial durability is worse; the inorganic antibacterial material has poor immediate effect but better antibacterial durability. With the rapid development of science and technology, various antibacterial materials have appeared, which can be roughly classified into organic antibacterial materials and inorganic antibacterial materials. Today, green and environmental protection are the focus of attention, people are aware that a great amount of organic antibacterial materials are harmful to human bodies and the environment, and when the organic antibacterial materials are used as antibacterial agents, the organic antibacterial materials cannot be guaranteed not to harm human health, and particularly, the organic antibacterial materials are applied to products frequently contacting with human bodies and need careful research, so that the use of the organic antibacterial agents is limited.

The invention patent with the patent number of 200620113237.1 discloses an antibacterial paper with antibacterial layers coated on the upper and lower surfaces of a paper fiber layer, wherein the antibacterial layers are formed by mixing a hydroxyapatite inorganic antibacterial agent containing silver and zinc ions and a surface sizing agent; because of high oxidation activity of zinc ions, the zinc ions are easy to generate chemistry with substances in the airThe antibacterial effect is influenced by the reaction, and the specific gravity of the hydroxyapatite is over high and reaches 3.2g/cm by adopting the hydroxyapatite as a carrier of silver and zinc ions³The specific gravity of the paper is increased, the printing activity of the paper base is influenced, and the subsequent processing and use are troublesome; and the inorganic antibacterial agent is coated on the surface layer of the paper base for a long time, has potential corrosivity on the paper base, has no influence in a short time, and increases the corrosivity after the paper base is damped, so that the paper base is mildewed and rotten.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the mildew-proof antibacterial white cardboard, which uses pure natural plants as antibacterial components, is compounded to obtain a coating layer, and the coating layer is coated on the surfaces of a surface layer and a bottom layer, so that the mildew-proof antibacterial white cardboard has an antibacterial effect, is natural and pollution-free, and has no potential harm to human bodies; the coating layer also improves the moisture resistance of the paper base and effectively avoids the problem of wetting and mildewing.

The purpose of the invention is realized by the following technical scheme:

the mildew-proof antibacterial white cardboard comprises base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent.

By adopting the technical scheme, the nano calcium carbonate has small specific gravity which is about 2.0g/cm³The proportion of paper cannot be influenced, the calcium carbonate resource is wide in distribution and large in content, the raw materials are sufficiently supplied, and the cost is reduced; the nano calcium carbonate serving as a carrier of the antibacterial component has a slow release function, so that the antibacterial effect is more durable, and the nano calcium carbonate serving as a common filler for papermaking does not have adverse effects on the performance of paper, but has a certain reinforcing effect, so that the formed antibacterial film is beneficial to improving the strength of the paper, and the paper base has better printability. Microcrystalline cellulose (MCC) has special properties of low polymerization degree and large specific surface area, hydrogen bonds exist among molecules of the MCC, and the MCC is associated with the hydrogen bonds under pressure, so the MCC has high compressibility and is used for enhancing the physical strengthThe adhesive properties of the coating layer of the invention; and the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed to form a super-strong carrier of the antibacterial component, so that the reduction of the antibacterial performance of the antibacterial component can be effectively prevented. In addition, the superstrong combination of nano calcium carbonate and microcrystalline cellulose has a high specific surface area, can effectively play the moisture absorption and damp-proof effects, and effectively avoids the problem that the paper base is affected with damp and mildewed. Peach gum is resin secreted from bark of peach or mountain peach of Rosaceae, also called peach oil, peach fat, peach flower, peach gum and peach gel, and is naturally secreted from peach tree or secreted from wound under external force, and has sufficient water solubility and proper viscosity. The grapefruit seed Extract, GSE, is called grapefruit seed Extract, is extracted from natural plant materials, belongs to plant natural products, and has no harm to human body. GSE has strong antibacterial effect, is applied to fresh-keeping and sterilization of fruits and vegetables, has good effect, and has no report of applying the GSE to an antibacterial layer of a paper layer at present. The coating layer is successfully compounded by the novel antibacterial and mildewproof agent to obtain the coating layer, the high efficiency performance can be shown even under very diluted dosage, the compounding raw materials are simple, and the unexpected antibacterial and mildewproof effect is achieved.

Preferably, the coating layer comprises the following raw material components in parts by weight: 60-70 parts of nano calcium carbonate, 2-4 parts of microcrystalline cellulose, 35-45 parts of peach gum, 1-2 parts of grapefruit seed extract, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent.

By adopting the technical scheme, the component proportion of the coating layer is further optimized, so that the antibacterial and mildewproof effects are better.

Preferably, the coating layer further comprises 1-5 parts of silica gel powder.

By adopting the technical scheme, the silica gel powder is matched with the super-strong combination of the nano calcium carbonate and the microcrystalline cellulose, so that the moisture absorption and damp-proof performance is further improved, and the problem that the paper base is damped and mildewed is effectively avoided.

Preferably, the base paper comprises a surface layer, a core layer and a bottom layer, wherein the surface layer has the quantitative weight of 25-35g/m²The bottom layer has a quantitative content of 23-33 g/m²。

Preferably, the core layer comprises the following raw material components in parts by weight: 300 parts of bleached chemithermomechanical pulp and 130 parts of bleached willow wood pulp.

By adopting the technical scheme, only the bleached chemithermomechanical pulp is arranged in the core layer of the traditional white cardboard, so that the thickness requirement of the core layer can be met on one hand, and the white cardboard has certain stiffness on the other hand, so that the forming effect of the finished paper is good. To achieve better bulk and stiffness, the amount of bleached chemithermomechanical pulp needs to be increased continuously. However, if the amount of the white cardboard is simply adjusted, although the thickness is increased, the stiffness cannot meet the corresponding requirement, and the continuous increase of the bulk can cause problems of folding bubbles, even delamination and the like of the cardboard, thereby affecting the printing effect of the white cardboard. The willow fiber has the advantages of strong toughness, no upwarp and crack, no moth and the like, the bulk and the stiffness are balanced by adding the bleached willow wood pulp and matching with the bleached chemical thermomechanical pulp, and the toughness, the formability, the compression and deformation resistance and the printing effect of the ivory board are improved.

Preferably, the surface layer comprises the following raw material components in parts by weight: 80-90 parts of bleached hardwood pulp and 10-25 parts of bleached softwood pulp.

Preferably, the bottom layer comprises the following raw material components in parts by weight: 70-80 parts of bleached hardwood pulp and 20-35 parts of bleached softwood pulp.

By adopting the technical scheme, the paper base with high surface smoothness, good stability and durability is obtained.

The invention also provides a processing technology of the mildew-proof antibacterial white cardboard, which comprises the following operation steps:

(1) obtaining surface pulp, core pulp and bottom pulp by pulping and jordaning;

(2) respectively making the surface pulp, the core pulp and the bottom pulp to obtain wet paper sheets with a surface layer, a core layer and a bottom layer, and sequentially squeezing and drying the wet paper sheets to obtain base paper;

(3) uniformly coating the surface layer and the bottom layer of the base paper with the coating layer, and then sequentially performing calendaring, drying, cooling, reeling and rewinding to obtain the mildew-proof antibacterial white cardboard.

By adopting the technical scheme, the coating layer is uniformly coated on the surfaces of the surface layer and the bottom layer, so that the white cardboard has the antibacterial and mildewproof effects.

Preferably, in the step (3), the drying is performed until the moisture content of the base paper is 5.0 to 6.5%, and then the cooling operation is performed.

By adopting the technical scheme, the coating layer is ensured to be gradually and fully compounded with the paper layer into a whole along with the evaporation of water, the water content is controlled to be 5.0-6.5%, and the adhesion strength of the coating layer is ensured to be optimal while the performance of the white cardboard finished product is ensured.

Preferably, the coating layer is coated by surface doctor blade coating, and the coating amount is 10-12g/m²。

By adopting the technical scheme, the paper layer can be fully covered by the coating layer, the durability and the stability of the white cardboard are improved, and the mildew-proof and antibacterial effects of the coating layer can be exerted for a long time.

In conclusion, the invention has the following beneficial effects:

(1) the coating layer is obtained by compounding and is coated on the surface of the surface layer and the bottom layer by using the extract of the grapefruit seed as an antibacterial component, and the coating has high-efficiency antibacterial effect under very diluted dosage, is natural and pollution-free, and has no potential harm to human bodies;

(2) the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed to form a super-strong carrier of the antibacterial component, so that the reduction of the antibacterial performance of the antibacterial component can be effectively prevented;

(3) the combination body formed by mutual adsorption of the microcrystalline cellulose and the nano calcium carbonate has high specific surface area, effectively plays a role in moisture absorption and moisture prevention, and avoids the problem that the paper base is affected with damp and mildewed.

Detailed Description

The raw material components used in the invention are all commercial products and are not subjected to secondary processing treatment. The parts described in the following examples are parts by weight, and 1 part by weight represents 1 kg.