JPS5950798B2 - Strong size oil-proof paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel oil-resistant paper that has high sizing properties and oil resistance, and the object thereof is to have high sizing properties without using any paper-making sizing agent, and Our objective is to provide processed paper with excellent oil resistance.

It has been generally known that fluorine-based oil resistance agents impart oil resistance to paper and the like, and are widely used in the production of oil-containing food wrapping paper, industrial paper, machine wrapping paper, and the like.

However, although oil-resistant paper processed with the above-mentioned fluorine-based oil-resistant agent has sufficient oil resistance, it has extremely poor resistance to water, which has the biggest drawback of severely limiting its uses. In other words, when used as food wrapping paper, for example, it is difficult to avoid a decrease in paper strength and deterioration of appearance due to the penetration of moisture from the food and water and steam from the outside, reducing the commercial value of the package. significantly reduced. . Furthermore, when used as wrapping paper for machinery, the permeation of external moisture, rainwater, etc. may similarly cause a decrease in paper strength and deterioration of appearance, and may even lead to rusting of machinery.

Currently, as a method for imparting water resistance to oil-resistant paper containing the above-mentioned fluorine-based oil resistance agent, a method is used in which a paper-making sizing agent such as an alkyl ketene dimer is used in combination with the above-mentioned fluorine-based compound. Oil-proofing agents have a negative effect on the above-mentioned sizing agents, and it is currently difficult to measure satisfactory improvements in sizing properties and water resistance.

In view of the above-mentioned current situation, the present inventors have conducted various studies with the aim of improving the size properties, oil resistance, dry paper strength, etc. of oil-resistant paper containing fluorine-based oil resistance agents.

It's here. 5 As a result, it was discovered that especially when a fluorinated oil-proofing agent and a phosphorylated guar gum are made to coexist in paper, these two types of compounds act synergistically to achieve the above object, and the present invention has now been completed. I came to the conclusion.

That is, the present invention relates to an oil-resistant paper having high sizing properties and oil resistance, which is characterized by containing both a fluorine-based oil-proofing agent and a phosphorylated guar gum in the paper. In the method of the present invention, the fluorine oil-proofing agent and the oxidized guar gum coexisting in the paper do not interfere with each other's original effects, but rather promote each other, resulting in an excellent processed paper. Not only strength and oil resistance, but also water resistance such as size can be imparted. In particular, the oil-resistant paper of the present invention can be produced by using both a fluorine-based oil-resistant agent and phosphorylated guar gum by an internal addition method.

In this case, it is possible to obtain oil-resistant paper with both excellent oil resistance and sizing properties that were hitherto undesirable through a simple process and very economically. Therefore, according to the present invention, it is possible to obtain oil-resistant paper that has a high degree of sizing property and oil resistance, which was previously considered difficult even when using sizing agents, etc., and can be advantageously used in a wide range of applications. . The fluorine-based oil-resistant agent used in the present invention can generally be in the form of an aqueous emulsion containing a perfluoroalkyl derivative or a perfluoroalkanol derivative as a main component.

Examples of water-soluble or water-dispersible fluorine-based oil-resistant agents include Asahi Guard AG-530 and AG-7 manufactured by Asahi Glass Co., Ltd.
10, AG-7 40 and AG-550, Scotchiban paper size FC-807 and FC manufactured by 3M in the United States
-808, Zonyl RP manufactured by DuPont, USA, and Sumitomo Resin FP-110 manufactured by Sumitomo Chemical Co., Ltd. F
P-. Any commercially available products such as 1910, FP-130, and FP-15 can be used.

The amount of the fluorine-based oil-proofing agent used is not particularly limited, but it is 0.05 to 1.0% by weight, especially 0.1 to 0.5% by weight based on the paper pulp.
Preferably, it is contained in a proportion of % by weight. The phosphorylated quar gum used in the present invention is a new derivative of guar gum, which is a typical variety of natural gum, and is a special acid ester product obtained by phosphorylating and crosslinking guar gum.

Generally, it is sold as Type Pro Film 50 and 100 by Kiseki Co., Ltd. Phosphorylated guar gum is soluble in cold water, and in the present invention, it can be used in the form of either powder or aqueous solution.

If it is added as a powder, it must be added before the refiner or heater and thoroughly mixed with the paper stock. When used after being dispersed in water or steamed, it is added at an appropriate location at a concentration of 1 to 4%. The amount of phosphorylated guar gum added is in the range of 0.02 to 1.0% by weight, preferably 0.01 to 0.3% by weight based on the pulp. As mentioned above, the present invention has a fluorine-based oil resistance agent and phosphorylated guar gum as essential elements, but in the internal addition method, sulfuric acid bandate and various papermaking resins are used to fix these on the pulp. It is customary.

Various additives such as paper strength enhancers may also be added. For example, polyamide polyamine epichlorohydrin resin, melamine formaldehyde resin, urea formaldehyde resin,
It is possible to add cationic polyacrylamide, vegetable gum, dicyandiamide formaldehyde resin, polyethylene imine, polyamide resin, acrinoleamide dialinolethynoleammonium chloride polymer, and other cationic flocking agents, and the amount added is 0.5 per pulp. Sufficient effects are expected when the amount is less than % by weight.

As mentioned above, the oil-resistant paper of the present invention is produced by adding a fixing agent to an aqueous dispersion of pulp or other fibers used as a base paper material during paper making, and then adding a fluorine-based oil-proofing agent and oxidized guar gum. The so-called internal addition method (in terms of addition order, fixing agent,
It doesn't matter whether it is fluorine-based, oil-proofing agent, or phosphorylated guar gum. ), but also after paper is made by adding only a fixing agent and phosphorylated guar gum to the aqueous dispersion of the base paper material, it is processed using various impregnating machines such as a size press or calendar size, or by using a spray, roll coater, knife coater, etc. It can also be manufactured by an external addition method of impregnating or applying a fluorine-based oil-resistant agent using a coating machine. As the base paper material, in addition to pulp, for example, inorganic fibers such as asbestos fibers, ceramic fibers, and glass fibers, and artificial or synthetic fibers such as rayon, polypropylene, and acrylic fibers can be used.

In any of the above methods, it is possible to further add starch, filler, antifoaming agent, etc. that are normally used during papermaking.

Furthermore, in the case of the above internal addition method, known wax sizing agents,
It is also possible to use an alkyl ketene dimer and the like, which can provide even more improved sizing properties. In addition, when using the external addition method, it is also possible to add known additives such as starch and emulsions to the solution of the fluorine-based oil resistance agent according to a conventional method, and this also achieves the objective of the present invention. The effect is not hindered in any way. In the present invention, in both the internal addition method and the external addition method, oil-resistant paper with high sizing properties can be obtained simply by following various conventional drying methods without requiring special heat treatment steps. Since the oil-resistant size paper of the future will have the above-mentioned excellent properties including oil resistance and sizing properties, it can be used in a wide range of fields for various applications that take advantage of such properties.

For example, food wrapping paper, feed, fertilizer wrapping paper, garbage bags, paraffin base paper, iron plate laminated paper, release base paper, backing carbon paper, base paper for electrophotography, base paper for electrostatic recording, base paper for photosensitive paper, base paper for transfer, solvent-resistant paper. Industrial materials such as Next, examples of the present invention will be described in more detail, but it goes without saying that the present invention is not limited in any way by such description.

Note that the paper making method, measuring method, and testing method in the following examples were carried out in accordance with the methods specified below. Paper making method
: JISP-8209 Sizing test : JISP-8122 Oil resistance test : TAPPIRC-338X Example 1
-6 and Comparative Examples 1-4 Test conditions Pulp: LBKP/NBKP7/3 Beating degree 35BSR (C.s, f, 36 Oec) Chemical addition order: 1% solids aqueous solution of AG Fixes S-454 in 3% stock slurry Add the specified amount of Asahi Guard and stir for 3 minutes.
*8 Add predetermined amounts of AG-530 and Typrofilm 50 or 100 and stir for 3 minutes.

In Comparative Example 4, Acopel 12*4 was used instead of Typro film. Amount of chemical added: Paper basis weight based on pulp solid content: 609/i Table 1 shows the results based on the above test conditions.

Examples 7-8 and Comparative Example 5 After making paper with internal addition of phosphorylated guar gum, If oil is applied, Test condition Pulp: Same as above conditions.

Paper-making conditions: After adding a predetermined amount of Maylop 51 to a 3% fluorine-based paper stock slurry and stirring, a predetermined amount of Typrofilm 50 was added, stirred, and paper was made.

Paper basis weight: 60g/a Amount of chemicals added: Converted to pulp solids Coating conditions: The base paper obtained under the above conditions was coated with Asahi Guard AG-550.
Processing was performed using a size press method using a coating liquid of a predetermined concentration.

Size press processing conditions The results are shown in Table 2.

It should be noted that all percentages shown in the examples are percentages by weight.

Claims (1)

[Claims] 1. A strong size oil-resistant paper characterized by incorporating a fluorine-based oil-proofing agent and phosphorylated guar gum into the paper. 2. The strong size oil-resistant paper according to claim 1, wherein both the fluorine-based oil-resistant agent and the phosphorylated guar gum are added to the pulp slurry during paper making. 3. Claims 1 or 2, characterized in that the phosphorylated guar gum is added to pulp slurry during paper making, and the fluorinated oil-proofing agent is applied to the obtained base paper. Strong size oil-proof paper as listed. 4 Phosphorylated guar gum is 0.00 compared to pulp in paper
The strong size oil-proof paper according to any one of claims 1 to 3, characterized in that it contains 2 to 1.0% by weight. 5 Fluorine-based oil resistance agent is 0.05 to 1 for pulp in paper
．． The strong size oil-proof paper according to any one of claims 1 to 4, characterized in that it contains 0% by weight.