JPS5899185A - Inorganic undercoating material - 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 an inorganic mortar base material that is easy to apply with mortar and has excellent adhesion to mortar.

More specifically, by forming an impregnated layer of corrosion-resistant and water-resistant resin on the back side of an inorganic paper board, the inorganic mortar base material can control moisture absorption of mortar, etc. to be jointed, and exhibit high adhesive performance. It is related to.

Traditionally, construction methods such as cement mortar painting or plastering for houses, etc., involve nailing and fixing wood slate, etc., pasting waterproof paper such as tar felt paper, and then applying metallic lath steel on top of that. After fixing with pins, etc., or after fixing a wooden mortar base material coated with resin paint such as synthetic resin or a coating material mixed with inorganic material on the surface of the wooden board, apply mortar painting or spraying. was being carried out.

However, base materials made of wood-based materials are inferior in various durability such as fire resistance, water resistance, corrosion resistance, and insect repellency, and especially in the construction method using lath steel, after construction, The fatal flaw is that the mortar tends to crack and flake off over time.

In addition, in recent years, inorganic paper boards such as asbestos-cement boards, calcium silicate boards, pulp cement boards, and magnesium carbonate boards have come to be used as mortar base materials in place of the various wood-based base materials that have inferior durability as mentioned above. However, these inorganic paperboards have a high water absorption property, and moisture from the mortar coated on the surface is absorbed into the paperboard, making it extremely difficult to work with trowels, etc. Moreover, the hydration reaction of mortar over time becomes insufficient,
Since excellent adhesion and strength cannot be obtained, this has the disadvantage of causing cracks and peeling, which can lead to accidents. In order to improve this, the surface of the inorganic paper board is coated with thermoplastic resin or thermosetting resin, and the moisture contained in the mortar etc. to be painted is adjusted to be appropriately absorbed, and the mortar adhesion performance etc. A method to increase this has been proposed. But 1
In the case of the former resin, it deteriorates especially as the time elapses until the mortar etc. is applied as a joint.
In addition, it has the disadvantage that it cannot be expected to achieve a high level of mortar adhesion performance because it becomes dirty with deposits. As a result of the complete loss of water absorbency on the surface, when mortar, etc. is applied in patches, the moisture in the mortar flows down along the resin surface, which not only makes the mortar application work extremely difficult. In this case as well, there is a drawback that high mortar performance cannot be expected because the cement's water use reaction does not proceed sufficiently.

The purpose of the present invention is to provide a new inorganic base material that can improve workability such as troweling during mortar coating and exhibit high mortar performance when an inorganic paper board is used as a base material for mortar, etc. It is about providing.

As a result of intensive research to achieve this objective, the present inventors have found that the back side of an inorganic paperboard, that is, the opposite side to the side where mortar is applied, is impregnated with a resin having corrosion resistance, water resistance, etc. The inventors have discovered that the objective can be effectively achieved by forming layers, and have completed the present invention.

That is, the present invention provides an inorganic base material in which a resin impregnated layer having corrosion resistance, water resistance, etc. is formed on the back surface of an inorganic paper board.

The inorganic paperboard used in the present invention is: Kulp,
An aqueous slurry of fibrous materials such as asbestos, cement, inorganic powder materials, etc. is made into a sheet and formed into a plate shape with a thickness of usually 2 to 14+ mm using a roll or press, for example, for 5 days to 1 day.
It is manufactured by curing for 4 days and then drying. Examples of such inorganic paper boards include pulp cement boards, slag ceracola boards, asbestos cement boards, calcium silicate boards, magnesium carbonate boards, etc.
In the present invention, it is also possible to emboss the surface of an inorganic paperboard, but in this case, "for example, in forming a board, the surface is engraved with various irregularities before curing and drying." It can be easily formed by pressing with a mouth-ru.Drying after curing is usually 130 to 1
The drying process is carried out at a temperature of about 50° C. for 30 minutes to 1 hour, and the dried product is generally dried to a moisture content of 8% by weight or less, and then cut into predetermined dimensions to produce product boards.

Furthermore, in the present invention, examples of the resin having corrosion resistance and water resistance used for forming the impregnated layer on the back side of the inorganic paper board include thermosetting resins such as epoxy resins, phenol resins, amine resins, and polyester resins; , styrene, butadiene 1 acrylic ester, methacrylic ester, acrylonitrile, chloroprene, isoprene, isobutyne, vinyl acetate, ethylene, vinyl chloride,
Examples include thermoplastic synthetic resins and natural rubbers obtained by non-polymerizing copolymerization of one or more selected from vinylidene chloride and the like. Although these resins can be applied as solutions, it is industrially advantageous to apply them as aqueous emulsions.

In particular, synthetic rubber latex and acrylic emulsion are preferred for the base material of the present invention.

On the other hand, it is desirable that the resin-impregnated layer on the back side of the inorganic paper board be formed such that an unimpregnated layer remains, for example, generally on the surface layer of 2 to 3 layers, regardless of the thickness of the inorganic paper board. .

There are no restrictions on the method of impregnating the resin liquid as long as the resin-unimpregnated layer remains uniformly with the desired thickness.
- Any method that can be applied uniformly, such as a roll coater, flow coater, or spray gun, can be conveniently employed. This impregnation can generally be carried out at any time after the sheet board is formed, before or after drying.

In the inorganic base material obtained by the present invention, since the water absorption layer is essentially the resin-unimpregnated part at a depth of 2 to 3 meters on the surface layer, the moisture absorption of the mortar to be jointed is moderate, and the inorganic paper board There are no inconvenient phenomena that occur when a resin film is formed on the surface, and it can be applied very easily, and a stable and firmly bonded mortar layer can be formed.

Furthermore, the water absorption amount and water absorption rate of inorganic paperboards during construction vary depending on their material composition and manufacturing process conditions, particularly press pressure. For this reason, in the past, surface treatments, etc. corresponding to each type were performed at the time of construction.
By forming a resin-impregnated layer with corrosion resistance, water resistance, etc., the base material of the present invention can provide a base material with constant workability regardless of the differences in their properties, making it extremely easy to install on-site. be.

As described above, the inorganic base material according to the present invention has good workability when handling plastering mortar, etc., the mortar hardens through a sufficient water reaction, and the adhesive strength with the base material is extremely good, making it suitable for practical use. It is an excellent inorganic base material.

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

In the following, parts and percentages are based on weight unless otherwise specified.

Example 1 An aqueous slurry containing 50 parts of Portland cement, 15 parts of pulp, 5 parts of asbestos, silica sand, and 30 parts of Merck's inorganic mixed material was continuously made into paper using a circular mesh paper making machine, and press-formed using a roll press. After curing for 7 days, it was heated to 60℃ at a temperature of 130℃.
After drying for a minute, it was cut to produce an inorganic paper board with a thickness of 6.0 mm and a size of 3 parts and 6 shaku.

Next, 100 parts of styrene-butadiene synthetic rubber latex (solid content approximately 50%), 5 parts of epoxy resin emulsion (solid content approximately 50%), and Epoxy 41 II! A mixture of 5 parts of an emulsion-type curing agent for emulsions (solid content approximately 50%) and a sodium polyacrylate thickener to match the coating properties of the roll coater was prepared using a roll coater. It was applied to the back side of the board, impregnating the resin formulation to a depth of about 3 mm. Next, this plate was passed through a drying oven with a center temperature of about 70° C. for 1.5 minutes to obtain an inorganic base material of the present invention having a resin layer on the back side.

After 3 days of production, the inorganic base material obtained in this way was
A test piece was prepared by cutting it into a X5crn square, and mortar prepared at a ratio of cement: sand: water - 1: 3: 0.8 was applied to the surface of this test piece to a thickness of about 1 On+m, and the test pieces were kept for 1 week, 3 The strength of each sample was measured after being left to naturally cure for 1 week and 5 weeks. For measurement, a jig for measuring plane tensile strength was attached to the front surface (applied mortar surface) and back surface (resin-impregnated layer surface) of the test piece, and the adhesive strength was measured using Instro/.

In addition, for each curing period, 10%
The fracture strength was shown as an average value. In addition, the fracture locations of each coated test piece were investigated, and the results are summarized in Table 1. In addition, the indication of the location of destruction has the following meanings.

A side fracture-m-Inorganic paper-made plate fracture B-side fracture-m-Interfacial fracture between splicing mortar surface and inorganic paper-made plate surface C-plane fracture-m-Splice mortar fracture Example 2 58 parts of slag, 8 parts of Ceracola, 5 parts asbestos, 9 parts pulp,
A slag ceramic wall inorganic paper board (thickness: 12 mxr) was produced in the same manner as in Example 1 from a slurry of 15 parts of perlite, 2 parts of an alkali stimulant, and 3 parts of inorganic recycled powder.

Next, apply an acrylic emulsion (solid content approximately 45
%) and a water-soluble polymeric thickener added to suit the coating characteristics of a roll coater, a resin-unimpregnated layer with a depth of about 3.
An inorganic base material having m was obtained. This was tested in the same manner as in Example 1, and the results are shown in Table 1.

Example 3 56 parts of slag, 18 parts of Ceracola, 6 parts of asbestos, 11 parts of pulp
A slag ceracola-based inorganic paperboard for walls having a thickness of 10+mm was manufactured from an aqueous slurry containing 8 parts of perlite and 2 parts of an alkaline stimulant.

Next, on the back side, 100% methyl methacrylate-butadiene synthetic rubber latex (about 50% solids) was applied.
5 parts each of an epoxy resin emulsion and a curing agent (both of which were the same as those used in Example 1) and a sodium polyacrylate thickener were added and mixed to suit the coating characteristics of the roll coater. A resin-unimpregnated layer with a depth of approximately 31 mm manufactured using the same coating method and manufacturing conditions as in Example 1.
An inorganic base material having +ll11 was obtained. This was tested in the same manner as in Example 1, and the results are shown in Table 1.

Example 4 An aqueous slurry containing 50 parts of Portland cement, 15 parts of pulp, 5 parts of asbestos, and 30 parts of an inorganic mixture of silica sand and talc was continuously made into a 6 mm thick paper using a circular mesh paper machine, and then 3 parts were made into 6 shaku pieces. After cutting it and passing it through a metal roll carved with a height difference of 0.5 to 2 mm, the uneven pattern was embossed.
An inorganic paper board was produced by curing for 7 days and drying at 130°C for 60 minutes.Next, the same impregnating resin composition as in Example 1 was applied to the back side of the inorganic paper board with the uneven pattern. An inorganic base material was obtained by using the formulation using the same coating method and manufacturing conditions as in Example 1. This was treated and tested in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 1 The same test as in Example 1 was conducted by applying the same mortar as in Example 1 to the back surface of the inorganic paperboard manufactured in Example 1 without impregnating it with resin. The results are shown in Table 1.

Comparative Example 2 The back surface of the inorganic paper board produced in Example 2 was not impregnated with resin, but the same mortar as in Example 1 was applied and tested in the same manner. The results are shown in Table 1.

Comparative Example 3 The same test as in Example 1 was conducted without impregnating the back surface of the inorganic paperboard produced in Example 3 with the same mortar as in Example 1, without impregnating it with resin. The results are shown in Table 1.

Comparative Example 4 The same test as in Example 1 was conducted by applying the same mortar as in Example 1 to the back surface of the inorganic paperboard manufactured in Example 4 without impregnating it with resin. The results are shown in Table 1.

Claims (3)

[Claims] (1) Inorganic base material 0 in which a resin impregnated layer with corrosion resistance and water resistance is formed on the back side of an inorganic paper board. (2) The inorganic base material according to claim 1, wherein the inorganic paper board is a hydraulic inorganic board. (3) The inorganic base material according to claim 1, wherein the inorganic paper board has an embossed surface.