JPH0247399A - Backing paper for wallpaper having excellent heat resistance and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject backing paper useful for vinyl wallpaper, etc., showing a little color change with heating by performing dyeing treatment making fire resistant paper to show specific depression breadth of whiteness before and after the dyeing treatment. CONSTITUTION:A fire resistant paper is subjected to dyeing treatment so as to show >=40% whiteness by the dyeing treatment and 5-30% depression breadth of whiteness before and after the dyeing treatment to afford the aimed backing paper.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flame-retardant paper used as a lining paper for vinyl wallpaper, and in particular, it has a heat-resistant paper with little discoloration due to heating during the heating process during processing of vinyl paste. This invention relates to an excellent wallpaper lining paper and a method for producing the same.

[Conventional technology]

There are various types of wallpaper, such as vinyl wallpaper, woven wallpaper, and two-paper wallpaper, but in Japan, vinyl wallpaper generally accounts for the majority.

Wallpaper, including vinyl wallpaper, is generally made flame retardant as building standards laws become stricter.

Vinyl wallpaper is manufactured by applying vinyl paste to the surface of the backing paper, gelling it, printing, foaming, embossing, and other processes. In these steps, heat treatment is performed at 140 to 250°C, and at this time the backing paper changes color mainly due to the flame retardant blended. If this discoloration is large, it will affect the surface vinyl layer, making it difficult to match the color of the vinyl layer, and uneven discoloration will occur due to uneven temperature in the heating zone, both of which are undesirable as they will significantly reduce the commercial value. In order to improve the heat resistance of lining paper, attempts have been made to investigate papermaking raw materials, flame retardants, etc., but to date, nothing satisfactory has been achieved. is desired.

[Problem to be solved by the invention]

In view of the above-mentioned current situation, the inventors of the present invention have conducted intensive studies on the development of a lining paper that is less discolored by heating during the heat treatment process during vinyl paste processing, and have decided to apply a specific dyeing treatment to flame-retardant paper. It has been discovered that heat discoloration can be reduced by this.

[Means to solve the problem]

Guanidine series such as guanidine sulfamate, guanidine phosphate, and guanidine sulfate, and ammonium sulfamate are used to make the backing paper flame retardant.

Water-soluble or water-dispersible flame retardants such as condensed phosphoric acid are often used. These flame retardants decompose below the combustion temperature of cellulose and render cellulose flame retardant mainly through dehydration and carbonization. Lining paper generally undergoes very large discoloration when heated due to the flame retardant added. For example, the decrease in whiteness before and after heating Na3 filter paper manufactured by Toyo Roshi ■ for 2 minutes at 200°C is 2%, but when 25 weight of guanidine sulfamate, a flame retardant, is added, the same temperature is heated to 200°C.
When heat treated for 2 minutes, the decrease was as large as 15%. However, when applying flame retardant to filter paper, a direct dye Kayaku D manufactured by Nippon Kayaku ■ is added to the flame retardant aqueous solution.
Direct Brown WA to filter paper 0.0
When applying 1% by weight, the decrease in whiteness before and after heat treatment at 200° C. for 2 minutes was only 4%.

This value is significantly superior to that of paper which is coated with ordinary flame retardants, and is close to that of filter paper which is not coated with flame retardants, so it can be said that the heat resistance is extremely excellent.

As the dye used in the present invention, direct dyes, basic dyes, acid dyes, etc. used in ordinary paper making can be used. There are no particular restrictions on the dyeing method as long as it can be uniformly applied to the paper web, but for example, the internal addition method in which it is added to the paper stock in a beater or mixing chest, and the size dyeing method that is applied to the formed paper web. Press method can be used. The reason why the whiteness after dyeing treatment was limited to 40% or more is that
If it is less than %, the whiteness will be too low and the color of the backing paper will affect the surface vinyl layer, which is not preferable.

In addition, the reason why the reduction in whiteness before and after the dyeing process was limited to 5 to 30% is that if it is less than 5%, the effect of dyeing is very small, and the reduction in whiteness due to flame retardant during heating is extremely large.
Moreover, if it exceeds 30%, the decrease in whiteness due to the flame retardant during heating is small, but the decrease in whiteness due to dyeing is significant.

The raw material pulps that can be used in the present invention mainly include wood-based craft pulp, sulfide pulp, ground pulp, thermomechanical pulp, etc., as well as inorganic fibers such as glass fibers, and organic synthetic fibers such as polyamide fibers and polyester fibers. A mixed paper is also possible. Others include kaolin and talc.

It is also possible to add fillers such as clay and calcium carbonate, and to add fixing agents 9, paper strength improvers, and sizing agents 9, retention improvers, which are used as papermaking chemicals.

The flame retardant composition used in the present invention consists of a flame retardant and a binder, and the flame retardants include guanidine sulfamate, guanidine phosphate, and guanidine sulfate.

Water-soluble or water-dispersible flame retardants such as ammonium sulfamate, condensed phosphoric acid alkyl ester derivatives, and ammonium sulfate may be used alone or in combination of two or more.

As the binder, natural polymers such as starch, casein, and CMC, and synthetic resin emulsions such as acrylic resins and olefin resins can be used, but there are no particular limitations.

[Effect]

The present inventors have discovered that by dyeing flame-retardant lining paper for wallpaper, the reduction in whiteness during the heat treatment step during processing of vinyl paste can be significantly reduced compared to when it is not dyed.

By adding a flame retardant, the whiteness is significantly reduced when heated compared to paper without a flame retardant.

However, if the flame retardant-applied paper is dyed to reduce the whiteness to the level of whiteness during heating, the above-mentioned effect of reducing the width of the decrease in whiteness can be obtained. This is considered to be the result of the reduction in whiteness due to the flame retardant during heating being offset by the effect of the reduction in whiteness due to dyeing being decolored by heating and increasing whiteness.

[Examples and effects of the invention]

Hereinafter, the characteristics of the vinyl wallpaper lining paper of the present invention will be explained with reference to Examples. The test method was as shown below.

1. Whiteness: Measured according to JIS P-8122.

2. Decrease in whiteness: Based on the difference between the normal whiteness and the whiteness after heat treatment at 200° C. for 2 minutes.

3. @Flammability: Measured according to JIS A-1322.

Example I NBKP 50% by weight, LBKP 50% pulp, 1.5% sulfuric acid band, wet paper strength improver (Arayo Kagaku Kogyo ■
A paper web having a basis weight of 55 g/m was obtained by adding 0.1% of ARAFIX 1oo (trade name: ARAFIX 1OO), manufactured by Manufactory Co., Ltd. Next, to 100 parts by weight of guanidine sulfamate, 10 parts by weight of oxidized starch 9 2 parts by weight of surface sizing agent and Kayarus 5upra Brown 0602, a direct dye manufactured by Nippon Kayaku ##, were added.
The concentration of the flame retardant composition liquid containing parts by weight was adjusted to 25%, and 100% of the flame retardant composition was adhered to the paper web and dried to obtain a sample.

Comparative Example 1 The same procedure as Example 1 was carried out except that no dye was used.

Comparative Example 2 The same procedure as in Example 1 was carried out except that the blending ratio of the dye in the flame retardant composition liquid was 0.002 parts by weight.

Example 2 NBKP 40% by weight, LBKP 50% by weight, GP
1.5% by weight of sulfate in 10% by weight pulp.

Added 0.2% by weight of wet paper strength improver (manufactured by Arayo Kagaku Kogyo ■, trade name ARAFIX 100), and further added 0% of the direct dye Kayarus 5upra Brown manufactured by Nippon Kayaku ■.
．． Added 015% by weight, basis weight 55g/rri'
I got a paper fish. Furthermore, a flame retardant composition liquid was applied in the same manner as in Comparative Example 1 to obtain a sample.

Comparative Example 3 The same procedure as Example 2 was carried out except that the dye of Example 2 was not used.

Comparative Example 4 The same procedure as in Example 2 was carried out except that the dye compounding ratio in the pulp slurry was 0.05% by weight.

The results of measuring the whiteness reduction and flame retardancy of these samples are shown in the table.

As is clear from the margin table below, compared to Comparative Examples 1 and 3 which were not dyed, Examples 1 and 2 which were dyed had a smaller decrease in whiteness before and after heating. Further, in Comparative Example 2, where the whiteness decreases due to dyeing is small, the whiteness decreases before and after heating are similar to Comparative Example 1, and the effect is extremely small. In the case of Comparative Example 4, the degree of decrease in whiteness before and after heating was very good, but the whiteness before heating due to dyeing was extremely low, detracting from the commercial value.

Patent applicant: Sanyo Kokusaku Pulp Co., Ltd. Agent: Patent Attorney Tadao Noma

Claims (1)

[Claims] 1. A wallpaper lining paper made of dyed flame-retardant paper with good heat resistance and little discoloration upon heating. 2. A method for producing lining paper for wallpaper, which comprises using flame-retardant paper dyed so that the whiteness of the dyeing process is 40% or more and the whiteness decreases before and after the dyeing process is 5 to 30%.