JPS5926962A - Manufacture of lightweight hardened body - 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 a method for producing a lightweight hardening agent.

The cured products obtained using conventional organic foamed particles do not have sufficient strength and are not compatible with each other, so they have the disadvantage of peeling at the interface between the cement and the particles. Furthermore, cured products obtained using inorganic foamed particles made of metal powder such as aluminum are also brittle and have a high water absorption rate, so they also have poor strength and are currently unsatisfactory.

The present invention was made in view of these circumstances, and provides a method for producing a lightweight cured product that is lightweight, has a low water absorption rate, and has excellent strength.

This invention provides a lightweight material obtained by adding a resin that foams and hardens at room temperature to the cement as at least a part of the raw material cement, and mixing and stirring until the resin foams and hardens. The gist of this paper is a method for producing lightweight hardened bodies, which is characterized by the use of aggregates. Below - details of the invention will be described.

The raw material components of the lightweight hardened body in this invention are mainly composed of hydraulic substances such as blast furnace cement, slag, and Portland cement, all or part of which are used in the form of lightweight aggregates to be described later. In addition, fillers, inorganic fibers, etc. can also be added.

The lightweight aggregate is suitable for obtaining a hardened cementitious material and is used as at least a part of the raw material cement. The lightweight bone phase is obtained by adding a resin that foams and hardens at room temperature to an inorganic powder whose main component is cement powder, and mixing and stirring until the resin foams and gels (hardens). The cement powder in the lightweight aggregate is Portland cement.

Hydraulic cements such as blast furnace cement and slag (slag cement) are not particularly limited as long as they have hydraulic properties. The amount of cement powder is preferably 20% by weight (hereinafter abbreviated as "chi") or more of the total lightweight aggregate. This is because if the amount is less than 204, the integration reaction tends to be difficult to occur when added to the cement matrix, resulting in an insufficient amount. Urethane resin is a resin that foams and hardens at room temperature.

At least one selected from polyester resins and the like is used. In this case, the cream time or gel time of the resin is preferably 20 seconds or more. This is because mixing with the inorganic powder tends to be difficult if the time is less than 20 seconds.

In addition, fillers, inorganic fibers, and thermoplastic resins may be added to the lightweight aggregate to the extent that they do not interfere with the effects of the present invention. However, the amount of thermoplastic resin is 20
It is preferably less than 1000 mm, more preferably less than 1500 mm.

This is because if it exceeds this value, it tends to become difficult to form particles.

The above-mentioned #d fat, which foams and hardens at room temperature, is added to these inorganic powders mainly composed of cement powder, and the mixture is mixed and stirred. It is necessary to continue mixing and stirring in the groove where the vIj fat foams and hardens (gels). Further, the stirring speed is preferably 3 Orpm or more, more preferably 50 rpm or more. This is because when the speed is less than 30 rpm, particles tend not to form easily.

In this invention, the state in which a resin foams and hardens at room temperature refers to the following state. In other words, when a resin that foams and hardens at room temperature is added to the inorganic powder whose main component is cement powder, and the mixture and agitation are performed, the resin starts foaming as soon as the cream time or gel time of the resin is exceeded. and begins to swell. Further, as mixing and stirring are continued, foaming progresses and reaches a saturated state in about 60 seconds, causing gelation (hardening) of the resin. It refers to the state at this time.

In this way, when a resin that foams and hardens at room temperature is added to an inorganic powder, and the mixture is mixed and stirred until the resin gels (hardens) as described above, the mixture of the inorganic powder and resin becomes a lightweight bone with an increased bulk volume. Becomes wood. This lightweight aggregate is generally granular. Its surroundings are mostly coated with inorganic powder. The inside is a porous body made of a mixture of resin and inorganic powder.

In principle, water is not added in the production of lightweight aggregates, but a small amount of water may be added as long as hydration hardening of the cement does not occur or it does not interfere with compatibility with the cement matrix. can. A small amount of water has the effect of promoting foaming during stirring.

The lightweight aggregate obtained in this way is added as at least a part of the raw cement when producing a cementitious hardened body. The amount of lightweight bone material added is preferably 80 or less. This is because if the amount added exceeds 80 inches, it becomes difficult to integrate with the cement matrix and tends to become brittle. The amount of water during production of the cured product is preferably water/solid content = 0.4 or more. If it is less than 0.4, it tends to be difficult to mix the cement raw material and lightweight aggregate uniformly. In addition, foaming agents and the like may be added within a range that does not impede the effects of the present invention.

After uniformly mixing cement raw materials and lightweight aggregate, it is molded using a casting method, roll extrusion method, etc. After molding, it is cured and hardened. Curing can be carried out under normal conditions of room temperature to 100°C, and is not particularly limited. After curing, it is air-dried or dried at 60° C. or lower to obtain a lightweight cured product.

The lightweight hardened body obtained by this invention uses the special lightweight aggregate as the raw material as mentioned above, so it is extremely lightweight.
It also has low water absorption and excellent strength. Also,
The 7-ment matrix is uniformly integrated as a whole.

Examples of the present invention will be described below along with comparative examples.

[Example 1] 1.65% of blast furnace cement and 20% of fly ash were thoroughly mixed, and a urethane resin with a cream time of 80 seconds (Dainippon Ink Chemical Co., Ltd. ff High Plotter, xRP10
82, 5P290) were added thereto, and the mixture was mixed and stirred at a stirring speed of 50 rpm until the urethane resin foamed and gelled, to obtain granulated lightweight aggregate.

Next, the lightweight aggregate with a particle size of 5 mm or less was made into 20 parts, including 68.5 cm of blast furnace cement, 10% of pumice, and 1.5 cm of pulp.
Using water at a ratio of water/solid content - 45 to the solid content, first the pulp was spread and mixed with water, then inorganic substances and lightweight aggregate were added and mixed with stirring. It was molded using a one-way mold method. Next, after pre-curing at 30°C for 12 hours, curing at 8°C for 72 hours, and then curing at 60°C.
, and was dried for 24 hours to obtain a lightweight cured product. The performance of the lightweight cured product is shown in Table 1.

[Example 2] A lightweight hardened body was obtained under the same conditions as Example 1, except that the weight of the blast furnace top was 58.5% and the lightweight aggregate was 30q6. The performance of the lightweight cured product is shown in Table 1.

[Example 3] 60 g of blast furnace cement and 20 g of fly ash were thoroughly mixed, and 20 g of urethane resin (44V10, 6-520B manufactured by Sumitomo Bayer) with a cream time of 20 seconds was added thereto. The urethane resin foams at a stirring speed of 30 rpm.
The mixture was mixed and stirred until gelatinized to obtain granulated lightweight aggregate.

Next, add 20 grams of lightweight aggregate with a grain size of 10 mm or less to 68.5 grams of blast furnace cement, 10 grams of pumice, and 1 ounce of pulp.
．． 5%, and using water at a ratio of water/solid content = 0.5 to these solid contents, first spread and mix the pulp with water, then add inorganic substances and lightweight aggregate and mix with stirring. It was then molded using a casting method.

Next, pre-curing, curing and drying were performed under the same conditions as in Example 1 to obtain a lightweight cured product. The performance of lightweight cured products is the first
Shown in the table.

[Example 4] A lightweight hardened body was obtained under the same conditions as in Example 3, except that the blast furnace cement was 58.5'Z and the lightweight aggregate was 30 inches.

The performance of the lightweight cured product is shown in Table 1.

[Example 5] 50 tons of blast furnace cement, 20 units of fly ash.

Thoroughly mix 20 grams of perlite, add 10 parts by weight of foamable polyester resin containing 5 parts of gel tie rice,
Mix as in Example 1 at a stirring speed of 60 rpm.

A granulated lightweight aggregate was obtained by stirring.

Next, add 20 pieces of lightweight aggregate to the top of the blast furnace) 68.51 pumice 1
0 width and 1.5 inches of pulp, water was used at a ratio of water/solid content - 0.5 to these solid contents, and the pulp was first spread and mixed with water, and then inorganic substances and lightweight bones were mixed. The ingredients were added, stirred and mixed, and molded using a casting method. Next, pre-curing, curing and drying were performed under the same conditions as in Example 1 to obtain a lightweight cured product. The performance of the lightweight cured product is shown in Table 1.

100 parts by weight of unsaturated polyester (manufactured by Nippon Yubika Co., Ltd.) 6 Cobalt Chinaphthenate 1 Methyl ethyl ketone peroxide (Part 55) 11 Foaming agent CELLBORN, -5P-401 (manufactured by Hydraulic Chemical Co., Ltd.) 5.

Foaming aid CELLBORN-PD (manufactured by Hydration Kasei Co., Ltd.) 5
I [Comparative example] Blast furnace cement 68.5%, perlite 20%, U stone 10
1.5 parts of pulp and 1.5 parts of solid content are used as solid raw materials, and water is used at a ratio of 1 water/solid content = 0.45 to this solid content.First, the pulp is opened and mixed with water, and then other inorganic substances are added. The mixture was stirred and mixed, and molded using a casting method. Next, pre-curing was performed under the same conditions as in Example 1.

A cured product was obtained by curing and drying. The performance of the cured product is shown in Table 1.

Table 1 (Note) 1 The cured product evaluated for performance is 4cm x 4cm x 1
A 6 cm cube was used as a sample.

2 The water absorption rate was measured by immersing it in water for 24 hours.
,,.

Judging from the above results, the example was an excellent lightweight cured product with lower bulk density and water absorption and higher bending strength than the comparative example.

Procedural amendment (spontaneous) 1] December 27, 11J57 Commissioner of the Japan Patent Office 1. Indication of the case ■ 057 Patent Application No. 134033 2. Name of the invention Process for producing lightweight hardened body 3. Person making the amendment Case and Relationships Patent applicant Location 1048 Kadoma, Kadoma City, Osaka Name (583) Matsushita Electric Works Co., Ltd. Representative Director Iku Kobayashi 4, Agent 7 Contents of the amendment (1) Page 4, line 5 of the specification ~ In line 6, "Amount of thermoplastic resin" is corrected to "Amount of total resin."

(2) On page 6, line 7 of the specification, replace ro and 4J with r.
Correct it as o, 3J.

(3) On page 6, line 8 of the specification, replace ro and 4J with r.
Correct it as O, 3J.

Claims (2)

[Claims] (1) To obtain a cement-based hardened product, a resin that foams and hardens at room temperature is added to the cement as at least a part of the raw material cement, and the lightweight bone obtained by mixing and stirring until the resin foams and hardens. A lightweight hardening method characterized by the use of wood-shaped materials. (2) The method for producing a lightweight cured product according to claim 1, wherein the resin that foams and cures at room temperature is at least one selected from urethane resins and polyester resins.