JPS5870799A - Production of mineral fiberboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing mineral fiberboard whose fiber components are mineral fibers such as rock wool, mineral wool, and glass wool, without using reeds or asbestos that has a negative impact on the human body. , hardness 9 strength.

A method for efficiently manufacturing mineral fiberboard using a wet papermaking method, which has excellent performance such as fire resistance and prevention of sagging due to moisture absorption (SAG), and is mainly used for ceiling panels, wall panels, etc. It provides:

Generally, the manufacturing method of mineral fiberboard involves uniformly dispersing mineral fibers in a large amount of water equivalent to 10 to 10 times the amount of water together with appropriate amounts of binders and additives to form an aqueous slurry.
After papermaking and molding, the wet papermaking method is used to dry and harden the paper, and 2 to 3 times as much water as the mixture is added to a mixture of mineral fibers and appropriate amounts of binders and additives. There is a paste method in which the material is kneaded into a paste, extruded or rolled to form a plate, and then dried and solidified.

In particular, the former wet papermaking method is characterized by its excellent productivity in mass production, and uses asbestos as one of its solid components, which has extremely excellent retention and fixation effects as an organic binder. It is considered necessary and essential to do so. In other words, this wet papermaking method reduces the amount of organic binder used, maintains the fire resistance of the resulting mineral fiberboard, and satisfies the hardness and strength required for mineral fiberboard. In order to achieve this goal, the actual situation is that it is essential to use the above-mentioned asbestos as a retention and fixing material.

However, since the asbestos used as the above-mentioned retention and fixing material is a natural product, the raw material is depleted and the price is rising, and furthermore, asbestos dust may cause lung cancer. Due to stricter restrictions on the environment in which asbestos can be used, and the Ministry of Labor recommending that asbestos be used to less than 5%, the use of asbestos should be minimized or not used at all. A method for obtaining mineral fiberboard is desired. For this purpose, cellulose fibers and methylcellulose are used as defibration aids for mineral fibers, as well as retention agents and fixing agents for organic binders.

Attempts have been made to use carboxymethyl cellulose, gas, gas, etc.; In addition, methylcellulose, carboxymethylcellulose, and gum, etc., have sufficient action as defibrating aids for mineral fibers, and have sufficient retention and fixation effects on organic binders. Therefore, it is not possible to obtain a mineral fiberboard that is satisfactory in terms of strength.

The present invention has the configuration described in the claims, and thereby has not only fire resistance but also 1 hardness strength without using asbestos at all.

An object of the present invention is to provide a method for efficiently obtaining a mineral fiberboard having excellent performance in preventing sag due to moisture absorption (SAG).

The configuration of the method for manufacturing a mineral fiberboard of the present invention will be explained below.

In the present invention, as the first step, rock wool and mineral slag wool are used.

Mineral fibers such as glass wool gO-9! % by weight of an organic binder such as pulp, raw starch, boiled starch, polyvinyl alcohol, vinyl acetate emulsion, etc., and a tertiary amine as a retention and fixing agent for the organic binder. What about the etherified gas, the θ, os~O05% by weight, the retention for the organic binder, the adhesion agent, and the sagging due to moisture absorption? ) (SAG) Attapulgite 7-10 as a prevention material
Weight %, and if necessary binding aids such as polyacrylamide, polyacrylamide modified products, aluminum sulfate etc. 3
The solid component is a mixture of 10% by weight or less.
The solid components are dispersed in water equivalent to ~100 times as much to form an aqueous slurry consisting of a dispersion liquid having a weight ratio of ~g/g.

As a second step, the aqueous slurry obtained in the first step is formed into paper and dehydrated using a paper making machine such as a Fordrinier-2 circular mesh type.

Furthermore, as a final step, the paper sheet obtained in the second step is molded and then dried and cured.

The method for producing a mineral fiberboard of the present invention has the above-mentioned configuration, and in the conventional method for producing a mineral fiberboard, retention for an organic binder, adhesive agent, and sag due to moisture absorption (SAG) are reduced. It is characterized by the combination of 9th-class amine etherification and attapulgite in place of asbestos, which was used as a preventive material.

The 7th-class amine etherified gum used as a retention and adhesion material in the present invention is a strongly cationic polysaccharide in the form of a pale yellow powder, and has the property of being colloidally dispersed in water. In addition, it is uniformly dispersed to form a hydrophilic colloid P, and its molecular structure is linear with little or no branching,
Because it has excellent mobility, this grade 11 7:7
When mineral fibers are added to a dispersion of etherified gum, the 7th amine etherified gum is adsorbed on the surface of the mineral fibers, and the quaternary amine etherified gum is absorbed by the quaternary amine etherified gum. Since the tightness acts as a lubricant, the frictional resistance between the mineral fibers is alleviated, which promotes the fibrillation of the mineral fibers, and the mineral fibers adopt a random arrangement with no direction and become entangled. will increase. As a result of this action, wet mats with excellent strength can be obtained from mineral fiber dispersions using secondary amine etherification gum as a retention and adhesion agent for organic binders. Conceivable.

In addition, the Q-class amine etherified gum, which is the retention and fixation material, exhibits cationic properties in the aqueous slurry, so it electrically adsorbs to organic binders such as starch, which exhibit anionic properties, to form flocs. It is believed that this enhances the retention and fixation of the organic binder during papermaking and molding, thereby significantly improving the strength of the resulting mineral fiberboard.

In the present invention, retention for an organic binder,
Attapulgite, which is used as a fixing material and as a material to prevent the resulting mineral fiberboard from sagging due to moisture absorption, is a natural product, so it is difficult to express it with a fixed chemical formula.
H) 2Mg5S180□o・4H20, etc. is a multi-chain structure type clay, which has a diameter of 100λ and a length of l to several kinds of needle-like crystals, and has the property of dispersing colloidally in water. And its surface area is u/On? /f, it has a high adsorption performance, and when heated, it
It has the property that the zeolite water contained in the channel voids in the structure is dehydrated at temperatures below gO°C.

In the manufacturing process of the mineral fiberboard of the present invention, this attapulsite forms a colloid in the faucet slurry for wet papermaking, and due to its extremely large surface area and high adsorption performance, it acts as an organic binder in the aqueous slurry. In addition, in the mineral fiberboard obtained, the fiberboard is Since the moisture absorbed from the attapulgite is stored as zeolite water in the channel voids in the structure of the attapulgite, it acts to prevent the organic binder in the mineral fiberboard itself from absorbing moisture. This is thought to prevent the strength from decreasing due to moisture absorption of the organic binder in the mineral fiberboard, and also to prevent sag (SAG) due to moisture absorption.

As explained above, the method for manufacturing mineral fiberboard of the present invention is as follows:
As an aqueous slurry for wet papermaking, the q-class amine etherification acts as a retention agent and a fixing agent for an organic binder, as well as a retention agent for an organic binder, a fixing agent, and the obtained mineral fiber. It is characterized by the use of an aqueous dispersion of mineral fibers containing attapulgite, which acts as a material to prevent boards from sagging due to moisture absorption (SAG). The effect of being able to efficiently manufacture mineral fiberboard with excellent performance such as hardness 2 strength, fire resistance, and prevention of sagging due to moisture absorption (SAG) without using asbestos, which has a negative impact on
It is effective.

In other words, when the 9th-class amine etherification exerts the retention and fixation effect on the organic binder with only the gum, the resulting mineral fiberboard sag due to moisture absorption is 9.
(SAG) prevention performance is smaller than that of conventional organic binder glue tension/sagging due to moisture absorption of mineral fiberboard obtained by using asbestos as a fixing material. However, the retention of the organic binder is poor.
When the fixation effect is exerted only by attapulshite,
Large amounts of attapulsite must be used to provide the required strength to the resulting mineral fiberboard, which increases the water content of the aqueous slurry during the papermaking process and impairs freeness. Not only does it cause a decline in
In the drying process, the zeolite water in the attapulscheite is completely discharged, resulting in operational and economical disadvantages such as the need for a large amount of engineering energy for drying. However, by using an aqueous dispersion of mineral fibers having 9th class amine etherification as an aqueous slurry for wet papermaking, the 9th class amine etherification also contains 00OS~0.5% by weight of attapulgite and 7~10% by weight of attapulgite. , which eliminates all the disadvantages of using the above-mentioned Q-class amine etherified gar gum alone and the disadvantages of using attapulgite alone, and has a hardness of 9 strength.

Excellent performance such as fire resistance and prevention of sagging due to moisture absorption (SAG). Effect of mineral fiberboard 1. It can be manufactured efficiently.

・Hereinafter, the specific structure of the method for manufacturing mineral fiberboard of the present invention will be explained using examples, and the properties of the mineral fiberboard obtained will be explained as well as those of mineral fiberboard manufactured in comparative examples. Compare and explain the properties.

[Examples 1 to S] An aqueous slurry was prepared using an S weight % aqueous dispersion of solid components consisting of the respective composition components listed in the Nest Examples/~S column in Table 1 below, and the resulting aqueous slurry was Paper is made using a test paper making machine in the laboratory, dehydrated under reduced pressure, and then press molded using a press forming machine.

The obtained press molded product was dried at 1200°C using a hot air dryer.
It was dried and cured for S hours to obtain S type mineral fiberboards (I) to M with a thickness of /2rrrm.

[Comparative Example/~3] A slurry of a 5% by weight aqueous dispersion of the solid component consisting of each composition component listed in Comparative Example/~3 columns of Table 1 below was prepared, and thereafter operated in the same manner as in the Examples. Three types of mineral fiberboards ① to o6- were obtained.

For the seventh-class amine etherification, Maploid 9gO/(trade name) manufactured by Mayhall Chemical Company was used.

In addition, "pulp cellulose", which is one of the seven types of organic binders in the solid component, is TAPP obtained by beating pulp.
A stock solution of gel-like cellulose fibers having a filtration time of 700 seconds using a standard 5sheet machine was contained in an amount corresponding to 7% by weight in terms of solid content.

The moldability of the aqueous slurry used in the above Examples and Comparative Examples, the density 2 bending strength of each obtained mineral fiberboard, and the sag (SAG) prevention performance due to moisture absorption are the highest.
Shown in the table.

In addition, the moldability of the aqueous slurry is as follows: each aqueous slurry is mixed with the coarseness of the wire mesh SO mesh, the size of the wire mesh part 1loo x 0
0 rtrm 1 Vacuum degree of 9 parts of dehydration during molding/! ;00
This is the dewatering time when papermaking is performed using a test papermaking machine with m water column.

The drying properties are measured when a molded product with a size of 1,100 x 1,100 rtr and a thickness of 2 cm, obtained by papermaking and press molding during the manufacturing process, is dried at an ambient temperature of 200°C using a hot air circulation dryer. This is the time taken for the molded product to reach a constant weight value by measuring the weight loss of the product.

In addition, the density and bending strength of the obtained mineral fiberboard are
: The value measured according to fXB'Al5307 is 9 for reeds and sagging due to moisture absorption, and the (sAG) prevention performance is
Oran, a mineral fiberboard with a length of 330 mm is supported at both ends in the length direction with a span of 300 mm, and the temperature is 23 mm.
1. Leave it in an atmosphere of 0C and humidity qO% for 2 days. This is the value obtained by measuring the sagging (length) at the center position of the fiberboard.

From the results in Table 1, as the addition and content of attapulgite in the aqueous slurry increases, the papermaking drainage time, which indicates the moldability of the aqueous slurry, and the molded product obtained in the press molding process become completely dry. Including a large amount of attapulgite in the aqueous slurry has the effect of increasing the SAG prevention performance. This is clearly a factor that reduces the production rate of mineral fiberboard and increases the energy required in the drying process that follows the molding process. therefore,
It is clear that the addition of attapulgite and the use of an aqueous slurry containing more than 10% by weight are not preferred from the viewpoint of production efficiency and manufacturing cost of mineral fiberboard.

The method for producing a mineral fiberboard according to the present invention has the above-mentioned structure.

Strength can be achieved without using the Arapest used as a fixing bowl at all, and without reducing both the moldability of the aqueous slurry used as the raw material for papermaking and the drying properties of the press-formed molded product.

The present invention has the effect that a mineral fiberboard having excellent properties such as preventing sagging due to moisture absorption and fire resistance can be produced at low cost and under a suitable operating environment.

Patent applicant Nittobo Co., Ltd. Agent Rikichi Ichikawa Agent Tatsuya Tofuji

Claims (1)

[Claims] Mineral fiber gO - 95% by weight, organic binder λ ~ 10% by weight, retention for the organic binder, etherification of 9th class amine as a fixing agent - gum O3 - 0.5% by weight, also organic An aqueous slurry containing 7 to 70% by weight of attapulgite, which is a retention agent for a binder, a fixing agent, and a material to prevent sagging due to moisture absorption of the obtained mineral fiberboard, is paper-formed and molded, and then dried and hardened. A method for producing mineral fiberboard.