阅读说明：本技术 一种防霉纸及其制备方法和应用 (Mildew-proof paper and preparation method and application thereof ) 是由 张敏盛 张益盛 潘玉丽 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种防霉纸及其制备方法和应用。一种防霉纸,制备原料包括：农作物秸秆、香樟木、芸香科果皮和烟草茎。本发明的防霉纸,通过各种植物原料的配合,能够从源头上解决纸质发霉的问题,且安全、无毒。(The invention discloses mildew-proof paper and a preparation method and application thereof. The mildew-proof paper is prepared from the following raw materials: crop straw, camphorwood, rutaceae pericarp and tobacco stems. The mildew-proof paper can solve the problem of mildew of paper from the source by matching various plant raw materials, and is safe and nontoxic.)

1. The mildew-proof paper is characterized in that the preparation raw materials comprise: crop straw, camphorwood, rutaceae pericarp and tobacco stems.

2. The mildew-resistant paper as claimed in claim 1, wherein the preparation raw materials comprise, by weight:

3. the mildew-resistant paper as claimed in claim 2, wherein the preparation raw materials comprise, in parts by weight:

4. the mildew-proof paper as claimed in any one of claims 1 to 3, wherein the raw material for preparing the mildew-proof paper further comprises at least one of sodium ascorbate and ginger powder; preferably, the addition amount of the sodium ascorbate is 1-3 parts by weight; preferably, the ginger powder is added in an amount of 5-8 parts by weight.

5. A method for preparing the mildew-proof paper as claimed in any one of claims 1 to 4, characterized by comprising the following steps:

s1, preparing corresponding paper pulp from crop straws, camphorwood, rutaceae peel and tobacco stems respectively by adopting a chemical pulping method, and mixing a camphorwood soak solution, a rutaceae peel soak solution and a tobacco stem soak solution generated in the chemical pulping process to obtain a mildew-proof solution;

s2, washing the paper pulp obtained in the step S1, and preparing the obtained various paper pulps into finished pulp according to a proportion;

and S3, forming the finished pulp obtained in the step S2 through a forming net, spraying the mildew-proof liquid obtained in the step S1 on the surface of the semi-finished mildew-proof paper obtained after forming, and drying to obtain the mildew-proof paper.

6. The method as claimed in claim 5, wherein in step S1, the chemical pulping comprises cooking, bleaching and pulping steps.

7. The method according to claim 5, wherein in step S1, the pulp has a solid content of 10-16%.

8. The method according to claim 5, wherein the step S1 of preparing the mold preventive solution further comprises mixing the above-mentioned camphorwood maceration extract, rutaceae pericarp maceration extract and tobacco stem maceration extract, and concentrating; preferably, the concentration treatment is stopped when the concentration is carried out to 40 to 70% of the original volume.

9. The preparation method of claim 5, wherein in the step S2, the solid content in the finished slurry is between 0.1 and 1.2%.

10. Use of the mildew-resistant paper according to any one of claims 1 to 4 in the fields of text printing and food packaging.

Technical Field

The invention belongs to the technical field of papermaking, and particularly relates to mildew-proof paper and a preparation method and application thereof.

Background

Although the popularity of electronic books is higher and higher with the development of science and technology, paper books are still very important for students to study and paper book enthusiasts.

In the process of collecting paper books or using textbooks, the problems of yellowing, mildew, moth-eating and the like of paper often occur, and are particularly serious in southern areas with high humidity, which brings great disadvantages to the storage of paper materials and the development of study and life of students.

The existing method for solving the mildew of the paper book mainly comprises remedial treatment methods of controlling the humidity of the book, placing a bactericide, conducting wiping after mildew occurs and the like. These methods, although effective to some extent, have not achieved source mold resistance. At present, in the industry, in order to realize source mildew resistance, partial mildew-proof paper has been developed, and the existing mildew-proof paper preparation methods are generally two, one is to coat a mildew-proof and waterproof layer on the surface of conventional paper/paperboard, and although the method is the most effective mildew-proof method, the waterproof coating is usually a hydrophobic coating, which is not beneficial to writing, i.e. is not suitable for making paper books; in the other method, an industrial mildew preventive is sprayed in the paper forming process, although the method can achieve a certain mildew preventive effect, the industrial mildew preventive usually has certain toxicity, and paper books, particularly textbooks for students, are closely contacted with human life and have the risk of being eaten by the students in the low ages by mistake, so that the method for directly spraying the mildew preventive is not safe enough.

In summary, the conventional mildew-proof paper can prevent mildew from the source, but has problems of writing disadvantage or unsatisfactory safety.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the mildew-proof paper provided by the invention can solve the problem of mildew of the paper from the source by matching various plant raw materials, and is safe and nontoxic.

The invention also provides a preparation method of the mildew-proof paper.

The invention also provides application of the mildew-proof paper in the fields of character printing and food packaging.

According to one aspect of the invention, the mildew-proof paper is prepared from the following raw materials: crop straw, camphorwood, rutaceae pericarp and tobacco stems.

According to a preferred embodiment of the present invention, at least the following advantages are provided:

(1) in recent years, in order to save the application of woody raw materials, the textbook paper is generally prepared by using herbaceous raw materials such as reed, but the paper obtained after bleaching has low strength and poor drainage performance due to the poor fiber length, strength and the like of the herbaceous raw materials, and thus the requirements of the printing paper are difficult to meet; the invention combines the herbaceous raw materials of crop straws, tobacco stems and the like with the woody raw material of camphorwood, thereby not only reducing the price of the raw materials for preparing the paper, but also improving the strength of the paper which is prepared from the herbaceous raw materials.

(2) In the traditional method, in order to obtain the mildew resistance of paper, an industrial mildew preventive is usually added, so that hidden danger is brought to the safety of the paper; according to the invention, traditional plants are used as raw materials of the mildew-proof paper, so that the mildew-proof effect is achieved, and the safety is improved compared with an industrial mildew-proof agent; for example, the camphor has the functions of preventing mildew and inhibiting insects, and is one of raw materials for preparing camphor balls; rutaceae plants are traditional mildew-proof raw materials, and the Rutaceae plants are placed in books from ancient times to achieve the mildew-proof effect; the tobacco also has antibacterial effect.

(3) The raw materials used in the invention mostly belong to byproducts in industrial production, have low price, reduce the cost of paper preparation, and also reduce the influence of the raw materials on the environment: for example, crop straws are usually treated by methods such as incineration and the like, so that air is polluted; rutaceae pericarp, except that orange peel can be used for preparing tangerine peel, the rest is discarded in the form of kitchen garbage; in tobacco plants, it is common to use lamina for the preparation of cigarettes, while the stems and roots of tobacco are typically discarded.

In some embodiments of the present invention, the mildew-proof paper is prepared from the following raw materials in parts by weight:

in some embodiments of the present invention, the mildew-proof paper is prepared from the following raw materials in parts by weight:

in some embodiments of the invention, the crop stalks comprise at least one of wheat stalks, rice stalks and corn stalks.

In some embodiments of the invention, the camphorwood, comprises the woody portion of cinnamomum camphora.

In some embodiments of the invention, the rutaceae pericarp comprises at least one of rutaceae pericarp, citrus pericarp, lemon pericarp, and mandarin pericarp.

In some embodiments of the invention, the tobacco stems comprise at least one of stems and roots of tobacco.

In some embodiments of the present invention, the raw material for preparing the mildew-proof paper further comprises at least one of sodium ascorbate and ginger powder.

In some embodiments of the present invention, the sodium ascorbate is added in an amount of 1 to 3 parts by weight.

The sodium ascorbate is an antioxidant and a color retention agent and can prevent the mildew-proof paper from discoloring and yellowing in the using process; meanwhile, the vitamin C sodium is a nutritional supplement for human bodies, and is safe and non-toxic.

In some embodiments of the present invention, the ginger powder is added in an amount of 5 to 8 parts by weight.

The ginger powder also has an antibacterial effect, and is derived from ginger which is a common seasoning, so that the ginger powder is safe and non-toxic.

In the preparation raw materials, the camphor wood, the Rutaceae pericarp and the tobacco stem all have the mildew-proof effect, and the camphor wood, the Rutaceae pericarp and the tobacco stem are matched with each other, so that the synergistic effect can be generated, and the mildew-proof effect is improved together.

In the preparation raw materials, the camphorwood, the Rutaceae pericarp and the tobacco stem all have fragrance, and the mildew-proof paper with different fragrance types and meeting the requirements of different crowds can be obtained by adjusting the proportion of the camphorwood, the Rutaceae pericarp and the tobacco stem.

In conclusion, most of the raw materials of the mildew-proof paper provided by the invention are from natural plants, the safety is high, and even if children eat part of the mildew-proof paper by mistake, the mildew-proof paper has no great toxicity.

According to another aspect of the invention, a preparation method of the mildew-proof paper is provided, which comprises the following steps:

s1, preparing corresponding paper pulp from crop straws, camphorwood, rutaceae peel and tobacco stems respectively by adopting a chemical pulping method, and mixing a camphorwood soak solution, a rutaceae peel soak solution and a tobacco stem soak solution generated in the chemical pulping process to obtain a mildew-proof solution;

s2, washing the paper pulp obtained in the step S1, and preparing the obtained various paper pulps into finished pulp according to a proportion;

and S3, forming the finished pulp obtained in the step S2 through a forming net, spraying the mildew-proof liquid obtained in the step S1 on the surface of the semi-finished mildew-proof paper obtained after forming, and drying to obtain the mildew-proof paper.

The preparation method according to a preferred embodiment of the present invention has at least the following advantageous effects:

(1) the preparation method provided by the invention has good matching performance with the traditional papermaking method, and does not need to modify an instrument, so that the cost is low.

(2) The preparation method provided by the invention fully utilizes fiber components (made into paper pulp) in the raw materials for preparing the mildew-proof paper and components (mostly existing in soaking liquid of various raw materials) such as mildew resistance, fragrance and the like in the raw materials, and accords with the concept of green production.

In some embodiments of the invention, in step S1, the pulp has a solid content of between 10 and 16%.

In some embodiments of the present invention, in step S1, the chemical pulping includes cooking, bleaching and pulping steps.

In some embodiments of the present invention, in step S1, the preparation process of the pulp corresponding to crop straws comprises:

s1a, mixing the crop straws with a cooking agent, and cooking;

s1b, performing solid-liquid separation on the mixture obtained in the step S1a to obtain a crop straw soaking solution and crop straw residues;

s1c, bleaching the crop straw residues after washing;

and S1d, mixing the solid obtained in the step S1c with water and pulping to obtain paper pulp corresponding to the crop straws.

In some embodiments of the invention, in step S1a, the cooking agent comprises a mixture of at least one of a sodium compound, a potassium compound, and an ammonium compound with a cooking aid.

In some embodiments of the present invention, in step S1a, the components of the cooking chemical in the crop straw are, by mass:

in some embodiments of the present invention, the sodium compound is at least one of sodium hydroxide, sodium carbonate, sodium sulfide, sodium sulfite, and sodium bisulfite.

In some embodiments of the invention, the potassium compound is at least one of potassium hydroxide, potassium carbonate, potassium sulfide, potassium sulfite, and potassium bisulfite.

In some embodiments of the present invention, the ammonium compound is at least one selected from the group consisting of ammonium sulfite, ammonium bisulfite and urea.

In some embodiments of the invention, the cooking aid is an anthraquinone and its derivatives.

In some embodiments of the invention, in step S1a, the mixing further comprises water, the weight ratio of the water to the crop straw is 1: (5-7).

In some embodiments of the present invention, in step S1a, the cooking is performed at 100-200 ℃ for 150-500 min.

In some embodiments of the present invention, in step S1b, the solid-liquid separation is at least one of filtration (including filter pressing and normal temperature filtration) and centrifugation.

In some embodiments of the invention, in step S1c, the washing is washing the straw residue obtained in step S1b with water for a plurality of times.

In some embodiments of the invention, in step S1c, the bleaching agent is sodium dithionate.

In some embodiments of the present invention, in step S1d, the beating is performed with a high frequency beater.

In some embodiments of the invention, in the step S1d, the mass percentage of the solid obtained in the step S1c in the pulp corresponding to the crop straw is 10-12%.

In some embodiments of the present invention, in step S1, the pulp corresponding to camphorwood is prepared by a similar method to the pulp corresponding to crop straw, except that in step S1d, the obtained pulp corresponding to camphorwood has a solid content of 10-16%.

In some embodiments of the present invention, in step S1, the pulp corresponding to rutaceae pericarp is prepared similarly to the pulp corresponding to crop straw, with the difference that in step S1d, the solid content in the pulp corresponding to rutaceae pericarp is 10-13%.

In some embodiments of the present invention, in step S1, the pulp corresponding to tobacco stalks is prepared similarly to the pulp corresponding to crop straws, with the difference that in step S1d, the solid content in the pulp corresponding to tobacco stalks is 10-15%.

In some embodiments of the present invention, in step S1, the step of concentrating the mold-proof solution further includes mixing the camphor wood soak solution, the rutaceae pericarp soak solution, and the tobacco stem soak solution.

In some embodiments of the invention, the concentration process is stopped when the concentration is 40 to 70% of the original volume.

In some embodiments of the present invention, in step S1, the mold inhibitor further includes at least one of the sodium ascorbate and the ginger powder.

In some embodiments of the present invention, in step S2, the solid content in the final slurry is between 0.1% and 1.2%.

In some embodiments of the invention, in the step S3, the spraying is performed 5 to 9 times.

In some embodiments of the invention, in step S3, the spraying amount is 50% or more of the mold preventive.

According to a further aspect of the invention, the application of the mildew-proof paper in the fields of word printing and food packaging is provided.

The application according to a preferred embodiment of the invention has at least the following advantageous effects:

the mildew-proof paper has certain strength, excellent printability, excellent mildew resistance and natural plant fragrance, adopts plant raw materials, is high in safety, can meet the application requirements of various fields, and is strong in universality.

In some embodiments of the invention, the field of text printing includes preparation of textbooks and literary books, and the like.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

Example 1

The embodiment prepares the mildew-proof paper, and the specific process is as follows:

s1, preparing corresponding paper pulp from crop straws, camphorwood, rutaceae peel and tobacco stems respectively by adopting a chemical pulping method, and mixing a camphorwood soak solution, a rutaceae peel soak solution and a tobacco stem soak solution generated in the chemical pulping process to obtain a mildew-proof solution; wherein the furnish of each pulp is as shown in table 1; the specific preparation method of the paper pulp comprises the following steps:

s1a, mixing crop straws, camphorwood, rutaceae pericarp and tobacco stems with a cooking medicament respectively, and cooking; in the cooking process, heating to 113 ℃ for the first time, preserving heat for 30min at the temperature, relieving pressure for 27min, heating to 170 ℃ for the second time, and preserving heat for 85 min; the formula of the medicament cooked in the step is shown in table 1;

s1b, performing solid-liquid separation on the mixture obtained in the step S1a to obtain crop straw residues, camphorwood residues, Rutaceae peel residues, tobacco stem residues and corresponding soaking liquid; mixing the obtained lignum Cinnamomi Camphorae soaking solution, Rutaceae pericarp soaking solution and tobacco stem soaking solution, adding 1kg vitamin C sodium, heating to 80 deg.C, and isolating air evaporation to 70% of original volume to obtain mildew-proof solution;

s1c, bleaching the crop straw residues after washing; washing specifically, washing the obtained slag with deionized water 3 times the volume of the slag obtained in the step S1b, and washing the slag three times respectively; the bleaching operation is as follows: mixing the washed slag with sodium dithionate accounting for 20 percent of the mass fraction of the slag in water, and extruding and filtering the mixture after treating the mixture for 24 hours;

s1d, mixing the solid obtained in the step S1c with water and pulping to obtain paper pulp corresponding to the crop straws; the solids content (mass) in each pulp was as follows:

s2, washing the four paper pulps obtained in the step S1 with water, wherein the specific method refers to the step S1c, all the obtained paper pulps are mixed, and water is added to prepare finished pulp with the solid content of 0.5%; the configuration process is carried out in a high-speed beater;

and S3, forming the finished pulp obtained in the step S2 through a forming net, spraying the mildew-proof liquid obtained in the step S1 on the surface of the semi-finished mildew-proof paper obtained after forming for 7 times, wherein the mildew-proof liquid is 60% of the mildew-proof liquid obtained in the step S1, and drying to obtain the mildew-proof paper.

Table 1 example 1 preparation of raw materials for each pulp in step S1

Example 2

In this example, a mildew-proof paper was prepared, and the specific process was different from that of example 1:

(1) in step S1b, sodium ascorbate was not included.

Comparative example 1

The comparison example prepares the mildew-proof paper, and the specific process is different from that of the example 1:

(1) the preparation raw material does not contain camphorwood.

Comparative example 2

The comparison example prepares the mildew-proof paper, and the specific process is different from that of the example 1:

(1) the raw materials for preparation do not include tobacco stalks.

Test examples

The test examples tested the odor, color, mechanical properties and mold resistance of the mold resistant papers prepared in the examples and comparative examples. Wherein: testing is carried out according to color reference GB T24999-;

the smell is directly sensed by olfaction;

the folding endurance performance is tested by referring to GBT 457-1989;

the method for testing the mildew resistance comprises the following steps: after pulverizing (20g) the mildew-proof paper obtained in examples and comparative examples, mixing with PDA culture medium to obtain mixed culture medium, wherein the PDA culture medium is composed of 200g of potato, 20g of cane sugar, 18g of agar and 1000ml of water; the thickness of the mixed culture medium in the culture dish is 6mm, aspergillus niger is inoculated in the culture dish, the inoculation amount of each culture dish is the same, the control group 1 is added with the same mass, the culture dish A4 paper of the coral sea, no paper is added in the control group 2, no aspergillus niger is inoculated in the control group 3, and any paper is also added. Culturing the groups of culture dishes at constant temperature of 30 ℃ for 5 days; and then measuring the diameter of the aspergillus growth on the culture dish by using a ruler, and measuring each diameter for 3 times to obtain an average value, wherein the bacteriostasis rate is (D-D)/D, D is the diameter of the PDA culture medium which is 100mm, and D is the diameter of the aspergillus growth. The results are shown in table 2:

the aspergillus niger is not inoculated in the control group 3, the bacteriostasis rate is 100 percent, which indicates that no additional strains are introduced in the environment, no paper is added in the control group 2, the bacteriostasis rate is 0 percent, which indicates that the aspergillus niger can be normally propagated; the comparison groups 2-3 show that the mildew-proof test result obtained in the experimental example is real;

the mildew-proof test result shows that the mildew-proof paper has obvious mildew-proof effect, but if any one of camphorwood, tobacco stems and the like is absent, the mildew-proof effect is obviously reduced.

The folding resistance test result shows that the mechanical property of the mildew-proof paper obtained by using the pure herbal raw materials is poor.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.