JPH0659644B2 - Extrusion molding method for fiber reinforced inorganic products - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for extrusion-molding fiber-reinforced inorganic products.

[Conventional technology]

Traditionally, fiber reinforced cement products such as slate roofing materials,
Asbestos is known to be very useful as a reinforcing fiber for wall boards, blocks, and the like.

[Problems of conventional technology]

However, the above-mentioned asbestos is required to be restricted or totally abolished because it becomes a pollution source and resource exhaustion, and various alternatives to asbestos as a reinforcing fiber have been sought and studied.

As the alternative fiber, first, there are glass fiber or ceramic fiber, but these fibers are inherently weak in alkali resistance, have various adverse effects in use in cement products, and have the drawback that a sufficient reinforcing effect cannot be obtained, Since natural or synthetic organic fibers such as cellulose, polypropylene, and polyethylene are combustible materials, the non-combustibility of building materials is impaired if added until the required strength is reached.In addition, in the case of organic synthetic fibers, autoclave high-temperature high-pressure curing is used. At that time, there was a problem that it was deteriorated or melted by heat and the reinforcing effect was considerably lowered.

In view of such a problem, as a fiber having excellent alkali resistance and having a reinforcing effect equivalent to that of asbestos, the strength of the fiber itself is a fiber-reinforced inorganic product having a fiber-like clay mineral in a crystalline form as a reinforcing fiber. The applicant of the present application has previously proposed a manufacturing method (Japanese Patent Application Laid-Open No. 64-24054).

[Problems of conventional technology]

However, since the mineral fibers used as the reinforcing fibers, such as attapulgite and sepiolite, have water absorbing properties, they are gradually absorbed in water between the kneading of the blended raw material and the extrusion molding, and the conventional amount of added water alone is sufficient. There was a problem that the fluidity of the kneaded product was lowered and the extrusion efficiency was deteriorated.

In addition, in order to effectively utilize defective products generated after extrusion molding, these are also returned to the extrusion molding device again, but in this case the material is pseudo-cured during the returning process and extrusion molding cannot be performed effectively In addition to this, there was a problem that the molding efficiency was also adversely affected.

On the other hand, from the viewpoint of the shape retention of the molded product, it is desirable that the molded body be cured early after extrusion molding, and therefore it is not a good idea to add too much water in order to prevent deterioration of fluidity,
There were points to be improved in the kneading adjustment of the materials.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention is excellent in alkali resistance, and the strength of the fiber itself is about the same as that of asbestos when using a mineral fiber having a reinforcing effect, and prevents the deterioration of the extrusion performance due to the water absorption and the like. Moreover, the purpose of the present invention is to obtain a method for producing a fiber-reinforced inorganic product that exhibits the shape-retaining property of a molded product after extrusion molding.

[Technology that has solved the problem]

That is, according to the extrusion molding method of the fiber-reinforced inorganic product of the present invention, a mineral repellency-imparting agent is added to a mineral fiber having a crystalline form and having water absorption, and the mixture is mixed. And necessary amount of cement and inorganic powder raw material such as silica stone powder, organic fiber such as pulp, extrusion molding aid and water are kneaded to form a slurry, and the duration of the water repellent effect of the water repellent imparting agent. It is characterized in that the slurry is extruded into a product shape.

[Action]

Clay minerals such as sepiolite, attapulgite or wollastonite are known as mineral fibers having a needle-like fibrous crystal form used in the present invention.

Since the clay mineral is a naturally occurring inorganic substance, it has an alkali resistance comparable to asbestos and an affinity for cement, but the mineral fiber has a water absorption property as described above.

Therefore, in order to temporarily suppress this water absorption, these fibers are coated with a water repellent.

Therefore, by imparting this water repellency, the mineral fibers are cement,
It is difficult to absorb water even if it is mixed with cement mixture such as silica stone powder and water, and it is possible to prevent the mineral fibers from absorbing the water content in the slurry from the time of kneading to the time of extrusion molding.

On the other hand, the water-repellent effect can be adjusted by the amount of the water-repellent agent added, and if the amount of the water-repellent agent or the like is reduced, the water-repellent treatment may be incomplete, so that the water-repellent effect is gradually repelled after a certain time. The water effect can be diminished and the water absorbing effect of the fibers can be made remarkable.

Therefore, if the blending amount of the mineral fiber and the water repellent is adjusted in consideration of this effect disappearance time, the water absorption is eventually suppressed from the mixing to the extrusion molding, while the extrusion molding control As a result of the water absorption effect of the fiber becoming more prominent as the water effect decreases, a very convenient phenomenon occurs in extrusion molding such that the hardness due to the thixotropic property of the cement slurry increases and the shape retention of the molded body is exhibited. is there.

As a result, the amount of water added during kneading can be minimized from the beginning, and the handling after molding is very good.

〔Example〕

 Next, embodiments of the present invention will be described step by step.

Mixing of mineral fiber and water repellent Example 1 To 10 parts by weight of sepiolite, 1 to 10 parts by weight of a powder of a higher fatty acid metal salt as a water repellent is added and uniformly mixed to give sepiolite a long lasting water repellent effect. Was tested.

For the water absorption test, put the above mixed material into a graduated cylinder that can measure 10cc to the 5cc scale position, and pour water on it so that the water surface position becomes the 10cc scale position. The time required for the decrease was measured.

Example 2 0.5 to 10 parts by weight of a silicone water repellent as a water repellent was added to 10 parts by weight of sepiolite and uniformly mixed, and the durability of the water repellent effect imparted to sepiolite was tested.

Example 3 To 10 parts by weight of sepiolite, 1 to 10 parts by weight of a higher fatty acid metal salt in the form of a slurry was added as a water repellent, and the mixture was uniformly mixed to give a continuous water repellent effect to sepiolite as in Example 1. Tested.

Example 4 To 10 parts by weight of sepiolite, 1 to 10 parts by weight of a mixture of talc powder as a water repellent and a higher fatty acid metal salt in a slurry ratio of 1: 1 was added and uniformly mixed, and the same manner as in Example 1 was performed. The durability of the water repellent effect imparted to the was tested.

The test results of Examples 1 to 4 are as shown in FIG.

Examples 5 to 8 Attapulgite was used in place of the sepiolite in Examples 1 to 4, and the durability of the water-repellent effect was tested in the same manner as in Examples 1 to 4.

The result is as shown in FIG.

Extrusion molding A mixture ratio of mineral fiber and water repellent having a water-repellent effect lasting 20 to 30 minutes, which is convenient for extrusion molding, was selected and extrusion-molded as follows.

Example 9 5 kg of sepiolite and 5 kg of calcium stearate in a slurry form were rapidly stirred for 1 minute, 10 kg of this mixture, 40 kg of cement, 45 kg of silica powder, 4 kg of pulse, 1 methyl cellulose
kg, water 30 kg, kneading, thickness 1.2 cm, width 20 cm, length 50
A cm shaped body was extruded.

The time required from material mixing to extrusion was 15 minutes.

At this time, it was found that the surface of the extruded molded article was smooth and beautiful, and that the molded article gradually began to harden 1 hour after the extrusion molding and the shape-retaining property was imparted.

Example 10 In the same manner as in Example 9, except that 5 kg of calcium stearate in Example 9 was replaced with 2 kg of silicone oil, extrusion molding was performed.

The time required from material mixing to extrusion molding is the same as in Example 9.
It was 15 minutes.

As in Example 9, it was found that the surface of the extrusion-molded product was smooth and beautiful, and the molded product gradually began to harden 1 hour after the extrusion-molding, and the shape-retaining property was imparted.

Example 11 5 kg of a mixture obtained by adding talc powder and magnesium stearate in a ratio of 1: 1 was used instead of 5 kg of calcium stearate in Example 9, and extrusion molding was carried out in the same manner as in Example 9.

The time required from material mixing to extrusion molding is the same as in Example 9.
It was 15 minutes.

Also at this time, as in Example 9, the surface of the extrusion-molded product was smooth and beautiful, and it was found that the molded product gradually began to harden 1 hour after the extrusion-molding and the shape-retaining property was imparted. did.

Examples 12 to 14 Attapulgite was used in place of the sepiolite used in Examples 9 to 11, and extrusion molding was performed in the same manner as in Examples 9 to 11, and the same result was obtained.

Comparative Example 1 5 kg of sepiolite, 40 kg of direct cement, 45 kg of silica stone,
4 kg of pulp, 1 kg of methylcellulose, and 30 kg of water were added and kneaded to extrude a molded body having a thickness of 1.2 cm, a width of 20 cm, and a length of 50 cm.

The time required from material mixing to extrusion was 15 minutes.

At this time, the slurry begins to harden gradually after about 5 minutes during extrusion molding, and after about 8 minutes the slurry is hardened and cracks occur on the surface of the molded product discharged from the die, resulting in a complete surface condition. I could not do it.

Comparative Example 2 Attapulgite was used in place of the sepiolite of Comparative Example 1, but the same results as in Comparative Example 1 were obtained.

Comparative Example 3 Water was extruded in the same manner as in Comparative Example 1 except that 30 kg of water in Comparative Example 1 was increased to 50 kg.

Extrusion molding itself was as beautiful as each example, but there was no shape retention of the molded body, it hardly hardened in terms of thixotropic property even after 1 hour, and a thin plate was gently inserted into the lower surface of the molded product, I carefully lifted up the molded product, but it collapsed.

Next, the molded bodies obtained in Examples 9 to 14 were subjected to a primary curing and then to an autoclave for a secondary curing.
175kg / when the bending strength test was done based on the No.
cm ^2, the upper and lower limit value difference 5 kg / cm ^2, to obtain a result.

〔effect〕

As described above, according to the present invention, even when a clay mineral is used as an asbestos substitute fiber, the water absorption of these clay mineral fibers can be used to enable the extrusion molding to be carried out very smoothly. Since the handling property of is improved remarkably, it has an effect that labor saving of subsequent handling can be achieved.

[Brief description of drawings]

1 and 2 are graphs showing the results of the water repellency test of Examples.

Claims (1)

[Claims] 1. A water-repellent imparting agent is added to and mixed with mineral fibers having a crystalline crystal form and a water-absorbing property, and then the mineral fibers imparted with water-repellency, a required amount of cement and silica stone powder, etc. Inorganic powder raw material and organic fiber such as pulp, extrusion molding aid and water are added and kneaded to form a slurry, and the slurry is extruded into a product shape within the duration of the water repellent effect of the water repellent agent. A method for extrusion-molding a fiber-reinforced inorganic product, which comprises molding.