JP2010095804A - Biodegradable resin-impregnated paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide biodegradable resin emulsion-impregnated paper improved in delamination strength. <P>SOLUTION: There is provided the biodegradable resin emulsion-impregnated paper produced by impregnating raw paper consisting mainly of pulp with a biodegradable resin emulsion prepared by adding ≥0.05 pt.wt. of ammonium zirconium carbonate to 100 pts.wt. of the solid content of the biodegradable resin emulsion, wherein raw paper prepared by adding ≥1 pt.wt. of a wet paper strength agent to 100 pts.wt. of pulp is used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a paper impregnated with a biodegradable resin emulsion. More particularly, the present invention relates to a biodegradable resin-impregnated paper having improved paper delamination strength.

Impregnated paper obtained by impregnating a paper with a resin emulsion is widely used as a means for improving various physical properties of paper. Among them, strength properties to be improved include wet and dry tensile strength, rupture degree, delamination strength, folding resistance, abrasion resistance, etc., but delamination strength is particularly important. In addition, impregnated papers for various uses in which the physical properties are improved by impregnating with a resin emulsion have been produced.

The material of the impregnating resin includes (meth) acrylic acid ester polymer and its copolymer with styrene, acrylonitrile, or vinyl acetate, ethylene-vinyl acetate copolymer, SBR, MBR, NBR, polyurethane, etc. There is. However, since these resin emulsions are non-biodegradable, they do not decompose even when discarded after use.

In recent years, development of biodegradable thermoplastic resins that biodegrade with microorganisms has progressed, and they have been used in various applications as films, fibers or molded articles. Emulsions have also been developed and several uses are under consideration. And the impregnated paper using this is also examined. However, even when impregnated with only the biodegradable resin emulsion, the strength is lower than that of the non-biodegradable resin emulsion-impregnated paper having the same impregnation rate, and therefore, it is necessary to increase the impregnation rate, resulting in poor practicality.

As one method for improving the strength of impregnated paper, a method of blending an aliphatic polyisocyanate compound into a biodegradable resin emulsion has been proposed, and its application to impregnated paper is described (Patent Document 1). However, although improvement in folding resistance and dry and wet fracture length is shown as physical properties, there is no description about delamination strength.
JP 2002-371259 A

As a method for improving the delamination strength of impregnated paper, the present inventor proposed a method of impregnating a biodegradable resin emulsion into a base paper to which a cationic wet paper strength agent is added at a high rate, and has applied for a patent (Patent Document). 2). This method is one of the methods for improving the delamination strength of impregnated paper.
Japanese Patent Laid-Open No. 2007-1000026

Zirconium ammonium carbonate is generally used as a water-proofing agent that imparts water resistance to the coating layer by reacting with carboxyl groups and hydroxyl groups contained in polymer materials used as binders for paper coating and insolubilizing them. It is used.
And the method of improving the water resistance of a biodegradable resin film, breaking strength, and breaking elongation by applying the crosslinking agent which consists of zirconium carbonate etc. to a biodegradable resin water dispersion is proposed (patent) Reference 3). However, there is no description about impregnated paper.
JP 2004-204038 A

An object of the present invention is to provide an impregnated paper having improved delamination strength using a biodegradable resin emulsion.

As a result of intensive studies to solve the above problems, the present inventors have found that the problem can be solved by impregnating the base paper with a biodegradable resin emulsion to which ammonium zirconium carbonate has been added, and have completed the present invention. .

The first of the present invention is impregnated with a biodegradable resin emulsion in which 0.05 parts by weight or more of ammonium zirconium carbonate is added to 100 parts by weight of the solid content of the biodegradable resin emulsion with respect to a base paper mainly composed of pulp. Biodegradable resin-impregnated paper.

The second aspect of the present invention is the biodegradable resin-impregnated paper according to claim 1, wherein a base paper to which 1 part by weight or more of a cationic wet paper strength agent is added to 100 parts by weight of pulp is used. .

The present invention has an effect that the delamination strength of the impregnated paper is improved by impregnating the base paper with a biodegradable resin emulsion to which ammonium zirconium carbonate is added.

Hereinafter, the present invention will be described in detail.
Examples of the biodegradable resin emulsion used in the present invention include biodegradable aliphatic polyester emulsions, specifically, polybutylene succinate-based, polycaprolactone-based, and polylactic acid-based emulsions.

In addition to the biodegradable resin emulsion, the impregnating agent used in the present invention may contain a biodegradable plasticizer emulsion, the other biodegradable emulsion and water-soluble substance, and a small amount of a sizing agent and a dye pigment. .

In the present invention, the impregnation rate refers to the ratio of the weight of the impregnating agent solid to the weight of the paper after impregnation. Usually, the weight of a certain area of the base paper is measured, the base paper is impregnated, and the weight after drying is measured to calculate the impregnation rate.

In the present invention, the impregnation rate is not particularly limited and may be determined according to the required physical properties, but is usually 5 to 50%. If the impregnation rate is less than 5%, physical properties as impregnated paper cannot be obtained. In addition, impregnated paper having an impregnation rate exceeding 50% can hardly be produced by emulsion impregnation.

In the present invention, the fiber material of the base paper to be impregnated mainly contains cellulose pulp, and may contain biodegradable chemical fiber (rayon) or synthetic fiber (polylactic acid fiber, PVA fiber, etc.). Cellulose pulp may be used only after disaggregation or after beating. Furthermore, the base paper may contain filler pigments and the like. In addition, in the case of impregnation with an aqueous system, a cationic wet paper strength agent of pulp is usually added.

Examples of the cationic wet paper strength agent used in the present invention include polyamide polyamine, epichlorohydrin, chitosan, and polyvinylamine.

Examples of the ammonium zirconium carbonate used in the present invention include Baycoat 20 manufactured by Nippon Light Metal Co., Ltd., AZ Coat manufactured by San Nopco, and Zircosol AC manufactured by Daiichi Rare Element Chemical Industries.

In the present invention, the zirconium zirconium carbonate added to the biodegradable resin emulsion is 0.05 parts by weight or more with respect to 100 parts by weight of the solid content of the biodegradable resin emulsion. If the amount of zirconium ammonium carbonate added is less than 0.05 parts by weight, the effect is insufficient. If the amount added is increased, the level is turned off and the cost is increased, so 2 parts by weight or less is preferable.

The present invention will be specifically described below with reference to examples.
In addition, the physical property in the Example of this invention was evaluated with the following method.

Interlaminar peel strength: A 15 mm width × appropriate length of the end of the test piece is slightly peeled off, and the peeled ends are fixed to the upper and lower grips of a tensile tester and peeled off at a low speed. At this time, the unpeeled portion is held so as to be perpendicular to the tensile direction. The peel strength was recorded on a recorder, and the value obtained by dividing the average value by the width was defined as the delamination strength.

Example 1
Wet paper strength agent (SR-6615 manufactured by Sumika Chemtech Co., Ltd.) was added to pulp with LBKP / NBKP = 7/3 and beaten in 500ml CSF, and 0.3g by weight per 100 parts by weight of pulp was added. to give a hand漉紙of m ^2. An aqueous dispersion obtained by adding 0.05 parts by weight of ammonium zirconium carbonate (Nippon Light Metals Baycoat 20) to 100 parts by weight of the solid content of a polylactic acid emulsion (Plasma L110A manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) The paper was impregnated so as to have an impregnation ratio of 30%, dried, and further subjected to heat treatment at 150 ° C. for 3 minutes. The delamination strength of this impregnated paper was 172 N / m.

Example 2
In Example 1, impregnation was carried out by the same method and impregnation except that 0.1 part by weight of ammonium zirconium carbonate was used. The delamination strength of this impregnated paper was 208 N / m.

Example 3
In Example 1, impregnation was carried out by the same method and impregnation except that 0.5 part by weight of ammonium zirconium carbonate was used. The delamination strength of this impregnated paper was 242 N / m.

Example 4
In Example 1, except that 1 part by weight of ammonium zirconium carbonate was used, manual milling and impregnation were performed to obtain an impregnated paper. The delamination strength of this impregnated paper was 253 N / m.

Comparative Example 1
In Example 1, manual impregnation and impregnation were performed in the same manner except that ammonium zirconium carbonate was not added to obtain an impregnated paper. The delamination strength of this impregnated paper was 152 N / m.

Example 5
Wet paper strength agent (SR-6615 manufactured by Sumika Chemtech Co., Ltd.) is added to the pulp blended with 500 ml CSF with LBKP / NBKP = 7/3 as the pulp composition, and 100 g / m ² basis weight is added per 100 parts by weight of the pulp. I got a hand-made paper. An aqueous dispersion obtained by adding 1 part by weight of ammonium zirconium carbonate (Nippon Light Metals Bay Coat 20) to 100 parts by weight of the solid content of a polylactic acid emulsion (Plasma L110A manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is applied to the above handmade paper. Impregnation was carried out so that the impregnation rate was 35%, followed by drying, and further heat treatment was performed at 150 ° C. for 3 minutes. The delamination strength of this impregnated paper was 287 N / m.

Comparative Example 2
In Example 5, manual impregnation and impregnation were performed in the same manner except that ammonium zirconium carbonate was not added to obtain an impregnated paper. The delamination strength of this impregnated paper was 250 N / m.

As described above, since the biodegradable resin-impregnated paper of the present invention has improved delamination strength, application to various impregnated papers that have been impregnated with non-biodegradable resin emulsions can be expected. .

Claims (2)

Biodegradable resin impregnation in which base paper mainly composed of pulp is impregnated with biodegradable resin emulsion in which 0.05 parts by weight or more of ammonium zirconium carbonate is added to 100 parts by weight of solid content of biodegradable resin emulsion paper. The biodegradable resin-impregnated paper according to claim 1, wherein a base paper to which 1 part by weight or more of a cationic wet paper strength agent is added to 100 parts by weight of pulp is used.