A method of manufacturing a biostable paper

 

(57) Abstract:

Usage: in the pulp and paper industry, as well as the protection of documents on a paper basis in the process of restoration by the method of topping up paper pulp missing parts of the sheet. The inventive prepare a paper weight. Give it a biocide. The resulting mass is then cast the paper web. As biocide use polyhexamethyleneguanidine in the amount of 1.5 to 2.5% by weight of air-dried fibers. table 1.

The alleged invention relates to the field of production of biostable fibrous materials and can be used in the pulp and paper industry, as well as to protect documents on paper with mechanical restoration by the method of adding the missing pieces of sheet paper weight restoration-casting machine.

Among the factors affecting the status of the documents in the storage process, plays an important role biofactor.

Emergency and violation of storage conditions in the stacks, create favorable conditions for damage of the documents by filamentous fungi.

To protect paper products from such exposure using the substance, the basis as a biocide is used aqueous dispersion of a copolymer of tributylammonium with butyl acrylate, the Acrylonitrile and acrylic acid with a particle size of 0.10 to 0.15 μm when the flow rate of 0.45 to 0.55% by weight of air-dry cellulose. After topping carry out the pressing and drying at 75 80oC.

The biocide is injected at the stage of preparation of paper pulp, used to tint the paper web or refilling missing parts restored documents.

Use as a biocide complex of the composition of the specified copolymer due to the high viscosity of the latter leads to non-uniform distribution in the paper pulp and reduce the effectiveness of protection of the finished sheets from fungi.

The closest analogue is the way to obtain paper pulp for the manufacture of bactericidal paper, which as a biocide use polyhexamethyleneguanidine (Phthlate) with molecular weight of 10000 to 100000. The biocide treatment is carried out by introducing into the fibre suspension specified product in an amount of 0.1 to 2.0% by weight of the absolutely dry fiber. Then produce the sheen of the paper web or individual sheets, followed by drying. Component of this biocide is chlorine ion, which are deposited on the paper during its production.

It is known that chlorine ion, showing the and paper during its storage.

In addition, the integral indicators of toxicometric Phthlate is a toxic product, regardless of the route of entry into the body.

The present invention is to increase the biostability of cellulose-containing materials, creation of new consumer qualities of paper, ensuring safety when working with antimicrobial drugs.

This object is achieved in that in the known method of manufacturing a biostable paper, comprising preparing a paper pulp processing the biocide by introducing the latest in pulp and sheen of the paper web, according to the invention as a biocide used is a water-soluble polyhexamethyleneguanidine (Phillott) 1,50 2,50% by weight of air-dried fiber.

The essence of the invention lies in the fact that the use as a biocide of Phillopino in aqueous solution with quantitative characteristics allows to suppress the growth of fungi, destructors, to increase the biological stability of cellulose-containing materials, their strength and give them a new consumer qualities.

To implement the method of Phillott in the amount of 1.5 to 2.5% of the lead ebb paper web or individual sheets, followed by drying.

The ability of the proposed method is confirmed by the following example.

Before forming the paper are preparing semi-finished product, i.e., 200 g of bleached Kraft pulp grind the roll to the extent of the grinding 55oSHR. Phillott take in the amount of 1.5% by weight of air-dry cellulose, which is 3.0, Prepare an aqueous solution of Phillopino and under stirring injected into the pulp suspension. Then cast paper weighing 50 g/m2and dried by contact.

Determination of the biological stability of the paper are according to GOST 9.048 89 "Product. Laboratory test methods for resistance to moulds on a 6-point scale, where a score of 0 corresponds to a maximum gribomont, and 5 points minimum.

Paper cut into samples of size 10 x 10 mm, placed on the surface of agar medium in Petri dishes and infect it with an aqueous suspension of spores of each of the test cultures: Aspergillus niger van Tieghem, Aspergillus terreus Thom. Aureobasidium pullulans (de Bary) Arnaud. Paecilomyces vauiotii Bainier. Penicillium funiculosum Thom. Penicillium ochxo-chloron Biourge. Scopulariopsis brevicaulis Bainier. Trichoderma viride Pers. ex S. F. Gray with a title (1 2) x 106conidia/ml to 0.1 ml of the Cultivation is carried out in a period of 28 days under 280 T is s, given in the table shows that funginertness the paper samples not containing biocide, estimated 4 to 5 points and is characterized by the presence of a significant amount of mushrooms-destructors. Sample paper Phillopino (in the amount of 0.25% by weight of air-dry pulp) is not observed inhibition of growth of fungi decomposers. The increase in the concentration of biocide to 1.5 to 2.5% provides reliable protection paper from fungi decomposers of cellulose materials. Mushrooms or didn't grow up completely (0 points), or there are only the signs of recovery of inoculum (1 point). Further increase in the content of Phillopino does not improve gribomont paper.

The value of the rupture load paper with the increase in the content of Phillopino increases the fracture resistance increases and reaches the maximum value when the content of biocide 1.5 to 2.5% by weight of air-dry cellulose. With further increase of the content of Phillopino fracture resistance is reduced.

Therefore, based on the data table has a recommended range of concentration of 1.5 to 2.5% of Phillopino to the weight of air-dry cellulose.

A method of manufacturing a biostable paper, comprising preparing a paper mA is as a biocide use polyhexamethyleneguanidine in the amount of 1.5 to 2.5% by weight of aerial fiber.

 

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