JPH0459202A - Manufacture of cellulose heat insulating material - Google Patents

Abstract

PURPOSE:To manufacture a mat-shaped industrial product of uniform quality and rationalize and simplify the heat insulating work by mixing a powdery melamine resin bonding agent with a fibrous material prepared by crushing paper and a paper product at the given ratio, spraying and laminating the mixture, and then applying heated vapor. CONSTITUTION:An old paper with its water content adjusted to approximately 10% is crushed and prepared in a manner that very fine fibers of 1mm or smaller constitute 300-1000 pts.wt. to large paper pieces of 1mm or larger constituting 100 pts.wt. Said 90 pts. of old paper crushed paper material and 10 pts. of powdery melamine resin bonding agent are agitated and mixed together and then sprayed and laminated in a template. Then, water vapor of 120 deg.C is applied through a laminate for eight minutes to humidify resin again and then cure the same. The material to which vapor is applied through is left and cooled, and the water content of a product should desirebly be 20% or less. Said cellulose family heat insulating material is provided with well-balanced strength and heat properties.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a cellulose-based heat insulating material, which is mainly used for the purposes of heat insulation, sound absorption, sound insulation, and prevention of dew condensation in buildings.

[Conventional technology] Paper, paper products, valves, and other cellulose fibers have traditionally shown excellent heat insulation, sound absorption, and sound insulation properties, so these fibers have been used alone or with flame-proof, mold-proof, and insect-proof treatments. It has been injected into spaces such as walls, under floors, and attic areas of buildings to provide insulation. These methods are generally called blowing methods or blowing methods.

In addition, as a method for forming a molded body from chip-like materials such as cellulose fibers, conventionally known glass wool mats and
11. It is easily possible to apply the manufacturing method for M-board by applying an adhesive to paper such as waste paper and pulverized paper products, and then scattering and laminating the adhesive to form a plate or mat.

[Problems to be Solved by the Invention] The conventional techniques described above have the following problems.

In other words, the former construction method has the advantage that it can be constructed regardless of the shape of the building's space, and does not create gaps between pillars, studs, frame frames, etc. in the space, but Compared to the case of installing sheet-shaped insulation materials, there are drawbacks such as a lack of uniformity in product quality due to on-site construction constraints, and poor workability such as generation of dust and relatively long work time. .

In addition, water-based adhesives are often used in conjunction with construction to improve the fixation of cellulose fibers, but as the temperature remains constant, the insulation performance decreases. There is a risk of freezing due to the agent, which may reduce adhesive strength.

In the latter method of forming a mat, when a thermosetting resin adhesive is used, since the cellulose fiber layer has low thermal conductivity, it takes a long time to harden and cure the resin.

Furthermore, when thermoplastic resin adhesives are used, defects remain that make it difficult for solvents and water to evaporate, making it difficult to simultaneously satisfy the product's mechanical strength and thermal and sound insulation properties, and also resulting in poor quality. The disadvantage is that a stable product cannot be obtained.

The present application was made in view of the problems of the prior art, and its purpose is to provide something that can do the following.

That is, the present invention aims to make it possible to form a plate-like or mat-like heat insulating material in advance without losing the characteristics of cellulose fibers, and to bring about great industrial effects.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the inventors of the present invention have conducted detailed studies, and as a result, have added and mixed a powdered thermosetting resin adhesive to a fibrous material. , that it is possible to bond fibrous materials by a simple method of passing heated steam, and that the shape and composition of the paper and paper product pulverized material used at this time has a large influence on the quality of the resulting product. They discovered this and arrived at the present invention.

That is, the present invention mixes a powdered melamine resin type adhesive in a predetermined ratio with a fibrous material obtained by crushing paper and paper products, spreads and laminates the mixture, and then passes heated steam through it. The first feature is that the thermosetting resin is thermally cured under rewetting conditions, and at that time, the raw material properties remain the same as paper obtained by roughly crushing paper and paper products. A large piece of paper less than m, more than 31 cubic meters and 1 ■I
The second feature is that it is a mixture of fine cellulose fibers that pass through a sieve.

In other words, by using a powdered adhesive, excessive moisture is not added to the fibrous material, so the drying process after resin curing can be significantly simplified compared to when using water-soluble or emulsion-type resins. .

Fibrous materials have great heat insulating properties and are easy to dry, making them highly effective.

Aeration of heated steam cures the resin more thermally and efficiently than simply aeration of dry air, but it also improves compatibility with fibrous materials by increasing the flow characteristics of the resin as it absorbs moisture, which improves product quality. It is thought that this contributes to the mechanical properties of

Although the moisture content of the fibrous material increases due to steam aeration,
The degree is small (20% under conditions where the resin is cured and vines).
not exceed.

Further, in the present invention, the proportion of the fine fiber portion was adjusted to be 300 to 1000 parts by weight to 100 parts by weight of the coarse paper piece portion.

If the paper pulverized material is composed only of fine fibers of 1 mm or less, it will not be possible to obtain a product with excellent mechanical strength for the amount of adhesive, and if too much adhesive is used, the product density will increase relatively. However, as a result, the insulation properties are impaired.

On the other hand, if it is made up of only a few pieces of coarse paper, it has a high mechanical strength.

The product density is also large (and the internal voids formed between the paper strips are also large, so air permeation resistance decreases, resulting in a loss of heat insulation.

In contrast, the structure of the present invention forms a structure in which coarse paper pieces are dispersed in a matrix of fine fibers.

In addition, most of these coarse pieces of paper are bonded through fine fibers, but some of them are bonded between the paper pieces.

Therefore, the coarse paper pieces effectively share the mechanical strength, and a product with excellent mechanical strength can be obtained with a relatively small amount of adhesive compared to the case of using only fine fibers.

Furthermore, the large-volume voids that occur when using a single piece of coarse paper are filled with fine fibers, and are transformed into more finely divided voids.

As a result, air permeation resistance increases, and the presence of fine fibers also reduces product density, which, combined with the reduced amount of adhesive used, makes it possible to create a product with excellent heat and sound insulation properties. .

Naturally, if the shape and composition of the paper composition deviate from this range, the results will approach those obtained when each is used alone, and it will not be a practical product.

[Effect] Explain along with the effects.

[Embodiments of the invention] Examples will be described with reference to the drawings.

Used paper with a moisture content of approximately 10% is crushed and llllll1
The amount of fine fibers of 1+am or less is adjusted to 300 to 1000 parts by weight based on 100 parts by weight of the above-mentioned coarse paper pieces.

After stirring and mixing 90 parts of this pulverized waste paper preparation and 10 parts of a powdered melamine resin adhesive, the mixture is dispersed and laminated into a mold.

The blending amount of this adhesive is not particularly limited, but it is preferably in the range of 5 to 20% based on the crushed waste paper.

This is because if the amount of adhesive is small, the necessary mechanical strength cannot be obtained, and if the amount is excessive, the product density will increase and the heat insulation properties will decrease.

Furthermore, in addition to melamine resin, noholac type phenol resin and urea resin can be used as the adhesive.

Furthermore, if necessary, the density can be adjusted by applying a compression operation after lamination.

Next, steam at 120"C was bubbled through the laminate for 8 minutes.
The resin is rewetted and then cured.

The steam ventilation conditions (temperature, time) may be any conditions that allow the resin to harden and can be set arbitrarily.

The steam vents are left to cool, but are vented and dried if necessary. It is desirable that the moisture content of the product be 20% or less.

By controlling the moisture content to 20% or less, the adhesive layer between the paper pieces and the fibers becomes strong, and the effect is that the shape does not collapse during normal handling operations performed during construction.

If the laminate has already been finished to the same thickness as the required product, it can be used as a product.

In addition, if there are multiple layers, after drying, the product is cut out to a predetermined thickness.

Typical properties of the product thus obtained are as follows.

Moisture: 15% Density: 004 Thermal conductivity: 0034 As a variation of the present invention, part or all of the coarse paper pieces of this configuration may be replaced with other similarly shaped materials, such as
It is possible to replace it with natural vegetable fibers such as rice straw, bagasse, hemp, rush, and rice husk, threads made of natural and chemical fibers, pieces of cloth, or mineral fibers such as glass fiber and rock wool.

In these cases, fine cellulose fibers provide insulation and
Since the sound insulation properties are shared, an effect similar to that obtained using coarse paper pieces can be obtained, but the mechanical strength is further improved.

Furthermore, by carrying out this lamination operation on plastic sheets, cloth, plywood, and metal plates, it is possible to obtain products that have an integrated color with these.

Furthermore, as a variation of this, it is possible to manufacture a sandwich structure or one in which these materials are placed in the middle layer of a cellulosic insulation material.

Furthermore, after the lamination operation, it is also possible to apply a synthetic resin to the surface portion of the cellulose-based heat insulating material and harden it to form a reinforcing coating.

By these means, it is possible to obtain a product with even better mechanical strength.

Furthermore, the crushed waste paper can be treated in advance with fireproofing, insectproofing, and moldproofing, and in this case, these properties are imparted to the resulting product, which has great practical effects.

Furthermore, by pre-water-repelling the crushed waste paper, the penetration of applied adhesive droplets into the fibers is suppressed, making it possible to bind fibers together in dots with a smaller amount of adhesive. This makes it possible to further improve the heat insulation properties and physical properties.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

The cellulose-based heat insulating material of the present invention can be produced by molding a mixture of coarse paper pieces obtained by crushing paper and paper products and fine fibrous materials into a mat shape using an adhesive. These two elements are responsible for each of these functions, and the material has a well-balanced combination of these functions.

As a result, we have been able to supply cellulose-based insulation material as a mat-like industrial product of uniform quality, and have realized rationalization and simplification of insulation construction.

In other words, it has become possible to construct a cellulose-based heat insulating material that is functionally superior to heat insulating materials such as glass wool and rock wool using the same method.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram of the manufacturing method. Patent applicant: Tamura Meiki Co., Ltd.

Claims (1)

[Claims] 1. A powdered thermosetting resin adhesive is added to and mixed with a fibrous material obtained by crushing paper and paper products, laminated into a mat shape, and the adhesive is then passed through steam. A method for producing a cellulose-based heat insulating material, characterized by curing it by heating. 2. A paper composition in which the fibrous material consists of fine fibrous material obtained by sufficiently crushing paper and paper products, and coarse paper pieces of 10 mm or less obtained by coarsely crushing paper so as to retain its shape as paper. A method for producing a cellulose-based heat insulating material according to claim 1.