JPS5929064A - Method for applying abrasion resistance to concrete mixer - Google Patents

Abstract

PURPOSE:To improve abrasion resistance by coating a primer on the wall surface of a concrete mixer, then coating a two-pack urethane resin coating material having thixotropy thereon. CONSTITUTION:A primer is coated at 80-150g/m<2> atm. of coating on the wall surface of a concrete mixer. A two pack epoxy resin primer, an urethane primer curable by moisture of one pack type, a modified silicone primer, a phenoxy resin primer, or the like is used for the primer. A two pack urethane resin painting material having thixotropy is then coated thereon at >=1mm. thickness. The paint contg. tolylene diisocyanates, phenylene diisocyanates, etc. as a principal component and contg. a polyamine compd., a polyol compd., etc. as a hardener compont is used as the two pack urethane resin paint.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a concrete mixing device to resist wear. More specifically, the present invention relates to a method for constructing a concrete mixing bag to resist wear and tear on parts of the bag that come into contact with fresh concrete and are likely to be damaged by abrasion.

The walls of concrete mixing equipment are subject to significant abrasion and damage due to contact with fresh concrete, and improvement of this problem is strongly desired. In particular, the concrete mixing equipment installed and mounted on a concrete mixer truck has a high operating rate and the amount of fresh concrete loaded and transported at one time is usually about 10 tons, so the concrete mixing equipment installed and mounted on the concrete mixer truck has a high rate of operation, and the amount of fresh concrete loaded and transported at one time is usually about 10 tons. The durability of these parts was a major problem in the industry, as the walls of the hoppers, drums, chutes, and blades suffered significant wear and tear. In particular, the wear and tear of the hopper and chute with fresh concrete is noticeable.
Improvement in this respect is strongly desired.

In addition, the fresh concrete adhering to the walls of the concrete mixing device must be thoroughly cleaned and removed before it solidifies, resulting in problems such as rust formation in addition to a decrease in work efficiency.

In order to avoid these problems, for example, a method of attaching a rubber sheet to the wall surface of a concrete mixing device using bolts or the like has been used. However, although this method improves wear resistance, fresh concrete tends to adhere to the bolt head, and problems such as cleaning and removal of this and the resulting rusting have not been solved. There was also the problem that the rubber sheet was easily damaged when cleaning and removing concrete.

As a result of extensive research into ways to solve these problems, the present inventors applied a two-component urethane resin coating material with thixotropy to the parts of concrete mixing equipment that are susceptible to wear and tear due to contact with fresh concrete. The present inventors have discovered that by applying thick coating, the above-mentioned problems can be solved and the workability of coating can be significantly improved, leading to the completion of the present invention.

That is, the present invention provides a wear-resistant construction method for a concrete mixing device, which is characterized in that a brimer is applied to the measuring device of the concrete mixing device, and then a two-component urethane resin coating material having thixotropy is applied. This is what we provide.

The method according to the invention is particularly advantageously applied to concrete mixing equipment mounted on concrete mixer trucks, which usually consists of a potper, drum, blades and chute,
Abrasion damage caused by contact with fresh concrete has been significantly improved, and the adhesion of fresh concrete has been significantly improved, and even if the fresh concrete sticks, it can be easily peeled off, so the decrease in workability due to cleaning and removal has been improved. The construction method of the present invention will be explained in detail below.

The brimer used in the present invention is not particularly limited, and may be any known one-component or two-component brimer, but is preferably a two-component type that has good adhesion to the wall surface of the concrete mixing device. It is preferable to use one that has good interlayer adhesion with the urethane resin coating material. Examples include a two-component epoxy resin primer, a wave-type moisture-curing urethane resin primer, a modified silicone primer, and a phenoxy resin primer. There is no particular limit to the amount of these primers applied, but it is usually about 80 to 50.
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The two-component urethane resin coating material with thixotropy used in the present invention is preferably one that can be attached to a vertical surface to a thickness of 1 mm or more, and has a hardness (Shore A) of 50 or more when cured. preferable.

If the thickness that can be applied to a vertical surface is less than one layer, it will be difficult to work on surfaces with three-dimensional curves, and it will be necessary to apply several coats to achieve the desired coating thickness. Undesirable.

Moreover, if the hardness at the time of curing is lower than 50, the coating film will be easily damaged, which is not preferable.

Examples of such two-component urethane resin-based paints include:
Polyisocyanate compounds obtained by reacting tolylene diisocyanes 1-1, phenylene diisocyanes 1-i, naphthalene diisocyanates, or these with polyhydric alcohols, polyether polyols, polyester polyols, etc. as main ingredients. On the other hand, it contains an active hydrogenated compound such as a polyamine compound or a polyol compound as a curing agent component,
Colloidal silica, organic bentonite,
Hydrogenated castor oil, fine grain charcoal, PVC powder, etc. Known fineness t! It is obtained by adding an i-imparting agent. The amount of these fineness imparting agents to be added is appropriately determined in consideration of the thickness and hardness that can be applied to the vertical surface, but is usually 0.5 to 20% of the fineness imparting agent in the two-component urethane resin material. Preferably it is 1 to 10%.

To carry out the present invention, first, a brimer is applied to the area to be constructed by a known application method such as troweling, brushing, or roller brushing. Next, a two-component urethane resin coating material having thixotropy is applied to the primer-coated surface using a trowel or a rubber spatula to a thickness of 1 mm to 15 mm. The two-component urethane resin coating material having thixotropy may be coated several times to achieve the desired thickness.

According to the method of the present invention, the abrasion resistance of the parts of the concrete mixing device that are easily damaged by abrasion due to contact with fresh concrete is improved, the adhesion of fresh concrete is prevented, and even if it does adhere, it can be easily removed. Furthermore, it is sufficient to repair damaged areas due to long-term use by simply applying the two-component urethane resin coating material over the area.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example Length 7.7 nt Width 2.5 m Height 8.5 m Concrete mixer truck inner chute part 200 coated with 200 Brimer 810 (Sumitomo Chemical Co., Ltd. product, epoxy resin based Brimer)
After 2 hours, apply poly, Flex F L-87 (product of Dai-Kogyo Seiyaku Co., Ltd., polyisocyapho 1-compound NGO content 6.5%) as the main agent.
) and 4 parts of colloidal silica, and as a hardening agent, 19.5 parts of 8,8"-dichloro-4,4°-diaminodiphenylmethane, 50 parts of charcoal, 6 parts of colloidal silica, and 2.5 parts of asbestos. A composition consisting of 5 parts of dioquidyl phthalate, 15 parts of dioquidyl phthalate, and 7 parts of a pigmented toner (manufactured by Fuji Shiroki Co., Ltd.) was mixed with a base agent/curing agent mixture ratio of 1/1 (heavy nail ratio).
and coated uniformly to a thickness of 5 mm using a metal trowel.

A concrete mixer truck with abrasion-resistant construction on the chute section was loaded with about 10 tons of ready-mixed concrete each time, and even after 200 operations (about 3 months),
No damage due to adhesion of ready-mixed concrete or wear was observed on the chute.

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Claims (1)

[Claims] Apply primer to the wall of the concrete mixing equipment,
A wear-resistant construction method for a concrete mixing device, characterized in that a two-component urethane resin-based coating material having fineness is then applied.