JPS6069144A - Modification of paint or rubber - Google Patents

Abstract

PURPOSE:To obtain a paint which can form a noncracking film or a rubber excellent in strength and elongation, by adding fine powder of true grasses obtained by destroying the molecular structure and solidifying the product to a paint or rubber. CONSTITUTION:Seed coats, trunks, branches, leaves, etc., of true grasses are fed into a clearance having a helical internal or external surface and gradually reducing in its sectional area, and heated at 150-600 deg.C and an elevated pressure of 1-100t/cm<2> to destroy the molecular structure. The product is solidified and then finely ground. This fine powder of true grasses is added to a paint or rubber.

Description

[Detailed description of the invention] For various conventional paints and rubbers, for example, paints.

It has a number of drawbacks, such as easy cracking after being applied to the object, and in the case of rubber, it lacks strength (this has been a problem in actual use).

Investigations into the causes of these defects have been carried out from various angles, but at present there is no way to completely solve these problems, and even more so, there is no easy way to solve them, including various paints, rubbers, and even other organic and inorganic substances. Moreover, there was no single reforming method that could be used to reform at low cost.

In addition, conventional fine powder fillers for paints and rubbers retain their original structure even in the fine powder state, so they have poor compatibility and dispersibility with various paints and rubbers. There was a problem and this improvement was desired.

The applicant of this application has conducted research and development in view of the above-mentioned current situation, and has found that various paints and rubbers, including other organic and inorganic substances, can be used in place of fillers used in these materials, or in new forms that can be added to them. The outer skin, trunk, branches, leaves, etc. of the seeds of ice plants are heated under a pressure of 1 to 100 tons per square cnr for 15 minutes.
After the molecular structure is destroyed and solidified under heat at 0 to 600°C, it is made into a fine powder, that is, compressed, and mixed with the additive. It was discovered that the capacity, dispersibility, etc. can be significantly improved, and the above-mentioned drawbacks can be eliminated. Although the existence of various plants of the genus Alicaceae itself is well known, the idea of using them as a modifying material that also serves as a variety of additives or to increase the amount of rubber has been unimaginable in the conventional technical field.

Even if this were attempted, it would be impossible to grind the plant into a fine powder that would be compatible with the additives, since the plant family is extremely hard.

We had no choice but to settle for the expectation that even if this was added, it would be impossible to improve the properties of the additive, although it would degrade them.

The present applicant has made it possible to improve the physical properties and other characteristics by adding and mixing the finely powdered Hemataceae plant produced by his own invention to additives.

In detail, the present invention will be described below. As the plant family, the outer husk of grain seeds such as rice husk, the rachis of rice, wheat, millet, etc. are appropriately selected and ground into fine powder and used. It is added to paints, rubber, and other organic or inorganic substances to produce products.

In this case, the paints are synthetic resin-based, rubber-based, oil-based, or cellulose-based, and the rubbers include various synthetic rubbers and natural products such as natural rubber. Moreover, it can be applied to its modification.

Hereinafter, description will be made based on specific examples. First, as the Phytophyte plant used in the present invention, one or more types of silicic acid-containing Seed husk, trunk, branches, leaves, etc. ,
The inner or outer surface has a spiral shape and is fed into a gap whose cross-sectional area is gradually reduced, under a pressure of 1 to 100 tons per square α,
After the molecular structure is destroyed and solidified at a temperature of 150 to 600'C, it is ground into powder using a crusher, and its composition is different from that of the original rice husk. The composition is shown in the composition comparison table below.

Composition Comparison Table Note: In the case of the rice husk of the present invention (1) in the above table, all other components except water are the values in terms of anhydride, and in the case of ordinary rice husk, each component shows the composition with respect to moisture.

As is clear from this composition comparison table, the rice husk powder used in the present invention has a significantly reduced lignin component, which inhibits compatibility and dispersibility with various paints and rubbers, compared to regular powder. This means that the rice husk powder according to the present invention, as described above, under a pressure of 1 to 100 tons per square portion,
This appears to be because the lignin component in the rice husk composition is decomposed and volatilized by the hot treatment at 150 to 600°C.

Furthermore, Fig. 1 shows a cross section of rice husk, and the rice husk used in the present invention (see Fig. 2) may be ordinary rice husk (Fig. 1) or the one shown in Fig. 3 which has been crushed by a generally known method. In comparison, it is found that the tissue is destroyed and consolidated and is different.

The present invention will be further explained below with reference to Examples.

Example 1 When a paint made by adding rice husk fine powder (approximately 100 mesh or more) instead of pigment as an extender in various paints was applied to a wall, no cracks occurred at all.
Furthermore, when it was filled into cracks in the wall itself as a "medi", it was proven to be effective as a complete repair material for cracks, and to completely prevent dew condensation on the coated surface. This is thought to be because the fibrous material in the rice husk exhibits water absorbing properties.

Example 2 Chloroprene rubber 30 (mjt%) as synthetic rubber
An insulating board for electrical appliances was manufactured by adding and mixing fine rice husk powder instead of the bulking agent, and by a normal molding method.As a result of investigating its properties, it was found that the tensile strength, It was confirmed that the elongation was excellent and the flame retardancy was further improved.

As described above, the present invention enables the production of rice husks, millet stems, and other legumes, etc., which have conventionally been simply incinerated and not used for any other purposes, at a rate of 1 to 100 tons per square meter.
After being heated under pressure of 150 to 600℃ to destroy the molecular structure and significantly reduce the content of lignin, etc., which inhibits compatibility and dispersibility with various paints and rubbers. It is solidified into a fine powder and added to various paints and rubbers, so for example, various paints after addition are:
Due to its composition, it does not cause any cracks after being applied to the object, and it is also convenient because it can be used as a "medi" material by filling cracks in the wall itself. When applied, it exhibits remarkable effects such as improved tensile strength, elongation, and flame retardant properties.

Therefore, according to the method of the present invention, it is possible to improve the properties of various paints and rubbers and to significantly reduce costs.

[Brief explanation of drawings]

Each of the accompanying drawings is a microscopic photograph of rice husk, with Figure 1 showing a cross section of rice husk, Figure 2 showing the crushed state of powdered grain used in the present invention, and Figure 3 showing the crushed state of normal rice husk. .

Claims (1)

[Claims] The outer skin, trunk, branches, leaves, etc. of seeds of plants of this family are heated at 150 to 600°C under a pressure of 1 to 100 parts per square meter.
After destroying the molecular structure and solidifying it, it is made into a fine powder and added to various paints and rubbers. This invention relates to a modification method that makes it possible to improve properties and other properties.