CN108867192B

CN108867192B - Preparation method of vermiculite preservative paper and vermiculite preservative paper prepared by using same

Info

Publication number: CN108867192B
Application number: CN201810850471.XA
Authority: CN
Inventors: 田维亮; 葛振红; 刘晓静
Original assignee: Tarim University
Current assignee: Tarim University
Priority date: 2018-07-28
Filing date: 2018-07-28
Publication date: 2021-10-01
Anticipated expiration: 2038-07-28
Also published as: CN108867192A

Abstract

The invention relates to a preparation method of vermiculite preservative paper and vermiculite preservative paper prepared by the method, wherein the preparation method comprises the following steps: (1) expanding and stripping natural laminated vermiculite to obtain vermiculite sheets; (2) adding strains into licorice root residues for reaction, adding alkali, sulfur-containing salt and a penetrating agent, putting the mixture into an ultrahigh pressure reaction kettle, performing rotary shearing and crushing reaction, rapidly blasting and discharging materials at low pressure, and washing and pulping to obtain fiber paper pulp; (3) adding a modifier or inorganic salt and a binder into fiber paper pulp, adding vermiculite sheets, reacting and mixing uniformly to obtain a paper pulp raw material; (4) and coating and drying the obtained paper pulp raw material liquid to obtain the vermiculite preservative paper capable of developing color according to humidity. The vermiculite preservative paper provided by the invention has the effects of moisturizing, preserving, sterilizing and disinfecting.

Description

Preparation method of vermiculite preservative paper and vermiculite preservative paper prepared by using same

Technical Field

The invention relates to the technical field of papermaking, in particular to a preparation method of vermiculite preservative paper and vermiculite preservative paper.

Background

Vermiculite is one of nonmetallic minerals with better resource prospect and potential advantages in China, is an important nonmetallic mineral, is also a magnesium-containing aluminosilicate secondary metamorphic mineral with a layered structure, belongs to layered silicate, and is cheap and easy to obtain. The vermiculite can resist high temperature, is a poor thermal conductor and has good electrical insulation; the expanded vermiculite has water absorption and moisture absorption; it expands at high temperature and is easy to peel. Vermiculite has the characteristics of good interlayer cation exchange capacity, expansion capacity, adsorption capacity, sound insulation, heat insulation, fire resistance, freezing resistance and the like, is stable in chemical property, is insoluble in water, is non-toxic and tasteless, has no side effect, and is mainly used for treating wastewater containing heavy metals and organic cations by utilizing good adsorption performance and ion exchange performance in industry, preparing antibacterial materials and heat insulation materials, vermiculite filter aid, purifying agent, organic vermiculite and the like.

The moisture preservation of various fruits is an effective method for prolonging the fruit preservation. Vermiculite is a natural mineral with moisture retention and moisture release, and has the nature of natural moisture retention. Meanwhile, the vermiculite two-dimensional layered structure material can obtain a thin layer, can be used for preparing a vermiculite film, has the functions of moisture preservation, fresh keeping and the like, and has obvious advantages in food packaging. However, vermiculite is mainly used in the fields of agriculture, building, water treatment and the like at present, and the application potential of the vermiculite needs to be excavated.

Disclosure of Invention

The invention aims to provide a vermiculite preservative paper and a preparation method thereof.

In order to achieve the aim, the invention provides a preparation method of vermiculite preservative paper, which comprises the following steps:

(1) expanding and stripping natural laminated vermiculite to obtain vermiculite sheets;

(2) adding strains into licorice root residues for reaction, adding alkali, sulfur-containing salt and a penetrating agent into the licorice root residues, putting the licorice root residues into an ultrahigh pressure reaction kettle, performing rotary shearing and crushing reaction, quickly blasting and discharging materials at low pressure, and washing and pulping the materials to obtain fiber paper pulp;

(3) adding a modifier or inorganic salt and a binder into the fiber paper pulp, adding vermiculite sheets, reacting and mixing uniformly to obtain a paper pulp raw material;

(4) and coating and drying the obtained paper pulp raw material liquid to obtain the vermiculite preservative paper capable of developing color according to humidity.

Optionally, the expansion stripping conditions in step (1) include: the expansion temperature is 600-1200 ℃, the time is 0.5-60min, and the peeled vermiculite sheets are 10000-1 nm.

Optionally, in the step (2), the alkali is sodium hydroxide or potassium hydroxide; the sulfur-containing salt is sodium sulfide or sodium sulfite, and the penetrating agent is sodium dioctyl sulfosuccinate, fatty alcohol-polyoxyethylene ether, isooctanol sodium sulfate, isomeric tridecanol ether phosphate, isotridecyl alcohol ether or phosphate potassium salt.

Optionally, in the step (2), on the basis of the total weight of the materials added into the reaction kettle, the mass concentration of the alkali is 0.01-80%, the mass concentration of the sulfur-containing salt is 0.1-90%, the mass concentration of the penetrating agent is 0.01-10%, the solid-liquid ratio is 1:5, the reaction pressure is 0.5-10Mpa, the blasting pressure is 1-10Mpa, and the reaction time is 0-300 min; preferably, the alkali concentration is 0.25%, the sulfur-containing salt concentration is 2%, the penetrant concentration is 0.1%, the solid-to-liquid ratio is 1:5, the bursting pressure is l.6MPa, and the reaction time is 15 min.

Optionally, in the step (2), in the rotating shearing and crushing reaction, the rotating speed of the cylinder of the ultrahigh pressure reaction kettle is 1-1000rpm, and the internal crushing and shearing rotating speed is 1-30000 rpm.

Optionally, in the step (3), the modifier is methyl red, methyl violet or congo red, the inorganic salt is cobalt chloride, the binder is polyvinyl alcohol, and the reaction time is 0-200 min.

Optionally, the solid content of the fiber pulp is 1-95%, and the mixing weight ratio of the vermiculite pieces and the pulp is 0.1-100%.

Optionally, the drying temperature in the step (4) is 6-300 ℃, and the drying time is 10-350 min.

Optionally, the strain in step (2) is white rot fungus, brown rot fungus or soft rot fungus, and the weight ratio of the strain to licorice root residue is 0.1-60%.

The invention also provides the vermiculite preservative paper obtained by the method.

The invention has the following advantages:

the invention prepares the vermiculite lamella, prepares the vermiculite preservative paper through self-assembly, constructs the new vermiculite functional material, and the invention makes the two-dimensional vermiculite lamella into the film, combines with the organic matter, constructs the organic-inorganic composite material, prepares the vermiculite preservative paper, expands the application field of the vermiculite, and has simple process, easy popularization and obvious economic value.

The vermiculite preservative paper prepared by the method disclosed by the invention keeps the moisture-keeping and fresh-keeping functions of vermiculite, and has obvious advantages compared with the conventional preservative paper, and natural vermiculite has the advantages of no toxicity and the like.

Drawings

FIG. 1 is a schematic flow diagram of one embodiment of the method of the present invention.

Fig. 2 is a photograph of vermiculite preservative paper prepared by the embodiment of the present invention.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1, the invention provides a preparation method of vermiculite preservative paper, which comprises the following steps:

According to the invention, the expansion stripping is used for stripping off the vermiculite lamina so as to be mixed with the pulp uniformly, and the conditions of the expansion stripping in the step (1) can comprise: the expansion temperature is 600-1200 ℃, the time is 0.5-60min, and the peeled vermiculite sheets are 10000-1 nm. The prepared vermiculite sheet can be dried to remove moisture, self-assembled vermiculite paper can be obtained, and the toughness of the vermiculite paper can be improved by reducing the thickness and the particle size of the vermiculite sheet due to low toughness of the prepared paper.

According to the invention, in step (2), the lignin structure is directionally decomposed by using strains (white rot fungi, brown rot fungi and soft rot fungi), and then the residual cellulose is dissociated by a chemical method. In the process, most lignin is decomposed and opened by organisms, the chemical method is only used as an auxiliary effect, and the used chemical products are fewer than the traditional method, so that the method can realize the purpose of discharging little or no waste liquid, and is an environment-friendly pulping and clean pulping method.

The invention will be further illustrated by the following examples, but is not to be construed as being limited thereto.

Examples

50 g of natural raw ore vermiculite is expanded for 5 minutes at 900 ℃ to obtain expanded vermiculite. And placing the obtained expanded vermiculite into a shearing stripping machine, stripping to obtain a vermiculite flake solution, and centrifuging at a high speed of 15000rpm for 120 minutes to obtain vermiculite nanosheets for later use.

Adding white rot fungus strain into Glycyrrhrizae radix residue of waste after Glycyrrhrizae radix extraction, fermenting to obtain white rot fungus with content of 0.5 wt% of total materials, decomposing lignin in Glycyrrhrizae radix residue, and dissociating cellulose. Adding sodium sulfide with the concentration of 2 mass percent, sodium dioctyl sulfosuccinate with the penetrant concentration of 0.1 mass percent, the sodium hydroxide concentration of 0.25 mass percent and the solid-to-liquid ratio of 1:5, putting the mixture into an ultrahigh pressure reaction kettle, carrying out rotary shearing and crushing reaction at the reaction pressure of 8MPa for 100min, the rotating speed of a cylinder body of the ultrahigh pressure reaction kettle of 1000rpm and the internal crushing and shearing rotating speed of 25000rpm, and rapidly blasting and discharging the material at low pressure, wherein the blasting pressure is l.6 MPa. And discharging, washing and pulping to obtain fiber paper pulp (the solid content is 85%) for later use.

The obtained vermiculite pieces were modified with cobalt chloride having a concentration of 15 mass% and polyvinyl alcohol having a binder concentration of 0.1 mass%, to obtain modified vermiculite.

Adding hexadecyl ammonium bromide into fiber paper pulp, modifying for 12 hours at 60 ℃, washing, adding the modified vermiculite, uniformly mixing, controlling the vermiculite content to be 85 mass percent, obtaining a paper pulp raw material, coating and drying at the drying temperature of 110 ℃ for 60 minutes, and obtaining the vermiculite preservative paper capable of developing color according to humidity, wherein the vermiculite paper capable of changing blue into pink according to humidity is shown in figure 2.

Comparative example

Substantially the same as in the examples, except that no vermiculite was added to the fiber pulp, the preservative paper was prepared.

Test example

The preservation effect of biological preservative paper on Zhonghua birthday peaches [ J ] Jiangsu agricultural science 2015, 43 (11): 343- & 345' method for testing the vermiculite preservative paper prepared in the example and the preservative paper prepared in the comparative example, the specific results are shown in Table 1:

source of fresh-keeping paper	Initial time of browning	60d weight loss
			Examples	50d	1.325％
Comparative example	35d	0.516％

As can be seen from the test examples, the vermiculite preservative paper has good preservation and moisture preservation effects.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The preparation method of the vermiculite preservative paper is characterized by comprising the following steps:

(2) adding strains into licorice root residues for reaction, adding alkali, sulfur-containing salt and a penetrating agent, putting the mixture into an ultrahigh pressure reaction kettle, performing rotary shearing and crushing reaction, rapidly blasting and discharging materials at low pressure, and washing and pulping to obtain fiber paper pulp;

(3) adding a modifier or inorganic salt and a binder into fiber paper pulp, adding vermiculite sheets, reacting and mixing uniformly to obtain a paper pulp raw material; vermiculite tablets: the mixing weight ratio of the paper pulp is 0.1-100%;

(4) coating and drying the obtained paper pulp raw material liquid to obtain vermiculite preservative paper capable of developing color according to humidity;

the swelling and stripping conditions in the step (1) comprise: the expansion temperature is 600-1200 ℃, the time is 0.5-60min, and the peeled vermiculite sheets are 10000-1 nm;

in the step (2), the reaction pressure in the ultrahigh pressure reaction kettle is 8MPa, and the explosion pressure of the low-pressure rapid explosion is 1.6 MPa;

the solid content of the fiber pulp in the step (3) is 1-95%;

the strain in the step (2) is white rot fungus, brown rot fungus or soft rot fungus, and the weight ratio of the strain to the licorice root residue is 0.1-60%.

2. The method according to claim 1, wherein in the step (2), the alkali is sodium hydroxide or potassium hydroxide; the sulfur-containing salt is sodium sulfide or sodium sulfite, and the penetrating agent is sodium dioctyl sulfosuccinate, fatty alcohol-polyoxyethylene ether, isooctanol sodium sulfate, isomeric tridecanol ether phosphate, isotridecyl alcohol ether or phosphate potassium salt.

3. The method as claimed in claim 1, wherein in the step (2), the mass concentration of the alkali is 0.01-80%, the mass concentration of the sulfur-containing salt is 0.1-90%, the mass concentration of the penetrating agent is 0.01-10%, the solid-liquid ratio is 1:5, the reaction pressure is 0.5-10MPa, the explosion pressure is 1-10MPa, and the reaction time is 0-300min based on the total weight of the materials added into the reaction kettle.

4. The method according to claim 1, wherein in the step (2) of the rotary shearing and crushing reaction, the rotating speed of the cylinder of the ultrahigh pressure reaction kettle is 1-1000rpm, and the rotating speed of the internal crushing and shearing is 1-30000 rpm.

5. The method according to claim 1, wherein in the step (3), the modifier is methyl red, methyl violet or congo red, the inorganic salt is cobalt chloride, the binder is polyvinyl alcohol, and the reaction time is 0-200 min.

6. The method according to claim 1, wherein the drying in step (4) is carried out at a temperature of 6 to 300 ℃ for a time of 10 to 350 min.

7. Vermiculite preservative paper prepared by the method of any one of claims 1 to 6.