JPH08208298A - Resin member - Google Patents

Abstract

PURPOSE: To uniformize the pot life of a resin member composed of a resin containing a hardening accelerator, an aggregate and a separation inhibitor independently of the period left standing in uncured state by decreasing the content of impurity metal ion component in the aggregate below a prescribed level. CONSTITUTION: This resin member (including resin mortar and resin concrete) is composed of a resin (e.g. an unsaturated polyester resin) containing a hardening accelerator (e.g. cobalt octenate), an aggregate (e.g. sand) and a separation inhibitor (e.g. ultrafine particle of silica anhydride). In this resin member, the content of impurity metal ion component (e.g. alkali metal ion or alkaline earth metal ion) in the aggregate is suppressed to <=5wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin member containing resin mortar and resin concrete, and in particular, a resin member such as resin mortar or resin concrete for mixing and using materials on site for the construction of a tunnel under the ground. It is about.

[0002]

2. Description of the Related Art Resin members include resin mortar and resin concrete. However, resin mortar uses an unsaturated polyester resin instead of the cement-based binder used for general concrete, and sand and calcium carbonate are used for the aggregate. The main feature is that the bending tensile strength is about 200 kg 50 minutes after the hardening liquid is mixed.
f / cm ³ and compressive strength of about 450 kgf / cm ³ are super early strength. The shrinkage rate at the time of curing is less than 0.1%, which is low shrinkability. It is 20 to 30% better than ordinary concrete in strength reduction after immersion in an acid / alkali solution. And the like. As shown in FIG. 1, the resin mortar has a system in which uncured resin mortar kneaded by a mixer is stored in a cassette for one ring and conveyed to a mixing and placing machine (machine). Kneading of resin mortar is performed prior to machine promotion in the construction cycle.

The uncured resin mortar has an unsaturated polyester resin (unsaturated polyester resin and additive), an aggregate (calcium carbonate and sand), a silane treatment agent, and a separation preventing material as shown in the resin mortar composition of FIG. (Ultrafine particulate anhydrous silica). An additive is added to the unsaturated polyester resin when the uncured resin mortar is prepared, and the additive is called a metal soap such as cobalt octenoate and cobalt naphthenate. This metallic soap reacts with a hardening agent added when hardening the resin mortar, and acts as a hardening accelerator. However,
If the sand contains metal ions as impurities, the metal ions of the impurities will react with the metal soap before adding the curing agent (cobalt octenoate and cobalt naphthenate will replace other metals. It seems to end up)
Therefore, the concentration of the metal soap initially put in is lowered. As a result, the function as a curing accelerator deteriorates, so even if a curing agent is added, it takes time to cure. In other words, even if the resin mortar is left in an uncured state for a long time, when the curing agent is added, it immediately hardens,
It is necessary not to reduce the concentration of the metal soap initially put, and for that purpose, it is essential to reduce metal ions as impurities that replace cobalt. Here, it does not cause a reaction between the metal soap and the metal ions of impurities as described above, and since it is sufficient to cause a chemical reaction with the metal soap when the curing agent is added, the metal as a curing accelerator together with the curing agent is used. I wonder if we should add soap to the uncured resin mortar. However,
The metal soap mixes uniformly with the unsaturated polyester resin, but even if an attempt is made to mix the metal soap with uncured resin mortar containing aggregate or the like, the metal soap will not mix uniformly. If the concentration of metal soap is not mixed evenly in the uncured resin mortar,
There is a problem that the degree of solidification of the resin mortar varies, and for this reason, it is necessary to mix the curing accelerator in advance before adding the curing agent.

Using unsaturated polyester resin as a binder,
In a resin mortar using sand or calcium carbonate as an aggregate, a curing agent for room temperature curing is methyl ethyl ketone peroxide (MEKPO) and cobalt octenoate (CoO).
c), a combination of metal soaps such as cobalt naphthenate is commonly used. A resin mortar in which an aromatic tertiary amine is incorporated into a curing agent system is used as a cast-in-place resin mortar to further accelerate the curing. Of the aggregate components used in this resin mortar, river sand, mountain sand, and sea sand containing silicon dioxide as the main component have been used, but there is no particular restriction on the amount of metal components contained in the sand. .

[0005]

DISCLOSURE OF THE INVENTION The present invention is based on a commonly used curing agent system of methyl ethyl ketone peroxide and cobalt octenoate so that the pot life (gel time) can be adjusted within 5 to 30 minutes at room temperature. A hardener system is used that further combines a tertiary amine and a polymerization inhibitor. When the resin mortar using this curing agent system is used in the site of underground tunnel construction, it is unavoidable due to the construction work, and the resin mortar state in which all the curing agent components except methyl ethyl ketone peroxide are mixed from the above curing agent system is used. May be left for more than a day. When using river sand, mountain sand, sea sand, etc., which have been used in the past, as the aggregate of this resin mortar, leave the uncured resin mortar for several hours or more, and then add methyl ethyl ketone peroxide, and then leave The longer the length, the longer the pot life of the resin mortar and the unpredictable pot life, and there were many problems in construction work. The present invention has been proposed to improve the above drawbacks, and an object of the present invention is to provide a resin member whose pot life can be predicted.

[0006]

In order to achieve the above object, the present invention provides a resin member comprising a resin containing a hardening accelerator, an aggregate and an anti-separation material, wherein the aggregate weighs metal ion components of impurities. A feature of the invention is a resin member whose percentage is suppressed to 5% or less. Furthermore, the present invention provides a resin mortar comprising a resin containing a hardening accelerator, an aggregate and a separation preventing material, wherein the aggregate is a resin mortar in which the metal ion component of impurities is suppressed to 5% or less by weight percentage. To do. Furthermore, the present invention provides a resin concrete comprising a resin containing a hardening accelerator, an aggregate and a separation preventing material, wherein the aggregate is a resin concrete in which the metal ion component of impurities is suppressed to 5% or less by weight percentage. To do.

[0007]

The present invention limits the metal ion component contained in the sand constituting the aggregate in the resin member, so that even when the resin mortar is left in an uncured state, regardless of the time left. It has the effect of making the pot life constant.

[0008]

EXAMPLES Next, typical examples of the present invention will be described. It is needless to say that the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention. (Example 1) The resin mortar used for underground tunnel construction mixes the materials shown in Table 1 on site and is used within a few hours. However, for the convenience of construction, uncured resin mortar (methyl ethyl ketone peroxide) is used. May be left for 1 day or more). in this case,
The pot life of the resin mortar after leaving it tends to be long. It is presumed that this phenomenon is caused by the fact that metal soaps such as cobalt octenoate and cobalt naphthenate, which are hardeners, are decomposed by the metal ion component in the aggregate, and have no hardening reaction function. Therefore, it seems that it becomes possible to leave the uncured resin mortar for one day or more by suppressing the metal ion component of the aggregate. The values of the extender and the binder are weight percentages, and the values of the separation preventing agent, the curing accelerator and the curing agent are weight percentages of the resin.

In this example, as shown in Table 2, a resin mortar prepared by using sand having a small amount of metal ion component and an uncured resin mortar using sand which has been conventionally used for comparison after being left for a certain period of time. The pot life was examined by mixing methyl ethyl ketone peroxide. However, the metal ion components are mainly alkali metal ions and alkaline earth metal ions, and other metal ion components are negligible, so they are ignored.

The results are shown in Table 3. As shown in the comparative example of Table 3, the resin mortar containing a large amount of metal ion components has a longer pot life as the standing time becomes longer. On the other hand, as shown in Example 1, the resin mortar using sand with a small amount of metal ion components started to cure within 5 minutes after the methyl ethyl ketone peroxide was mixed even if the standing time was long. Stabilization was achieved. (Material temperature: 23 ℃ constant)

(Example 2) The resin mortar formulation is the same as in Example 1. The components of the sand used in the resin mortar are shown in Table 4. Table 5 shows the pot life of the resin mortar when sand containing a smaller amount of metal component than in Example 1 was used. As shown in Table 5, curing started within 5 minutes after mixing methyl ethyl ketone peroxide. (Material temperature: 23 ° C. constant) In order to solve the above problems, the present invention, when adjusting resin mortar using sand containing silicon dioxide as a main component, weighs the metal ion component contained in the sand. It is effective to set the percentage to 5% or less.

(Example 3) The resin mortar formulation is the same as in Example 1. The components of the sand used in the resin mortar are as shown in Table 6. Table 7 shows the pot life of the resin mortar when sand containing a smaller amount of metal components than in Example 2 was used. As shown in Table 7, curing has started within 5 minutes after the incorporation of methyl ethyl ketone peroxide. (Material temperature: 23 ℃ constant)

The experimental results are shown in FIG. As shown by these results, it was revealed that the conventional resin mortar using sand has a longer gel time as it is left in the uncured state for a longer time. On the other hand, the resin mortar using silica sand with a small amount of metal ion components started to cure within 5 minutes after mixing with the curing solution even if left unhardened for 24 hours, and the quality of the resin mortar was stabilized. . From the above, the chemical composition of the bone agent used in the resin mortar can keep the gel time constant regardless of the standing time even if it is left in the uncured state for a long time by suppressing the content of impurities including metal ions. It became clear that it would be possible. As a result, it became possible to respond flexibly to the situation of construction on site and effectively use the materials. According to the above Examples 1, 2 and 3, in order to store in an uncured state for a long period of time, it is necessary to suppress the metal ion component contained in the sand to 5% or less by weight ratio, and if it exceeds 5%, the curing time is increased. Is unfavorable for practical use.

[0014]

As described above, by controlling the amount of metal ions contained in sand in the aggregate component used for resin mortar within 5%, even when the resin mortar is left in an uncured state. It has the advantage that the pot life can be kept constant regardless of the time left, and there will be no delay in construction. Although the resin mortar has been described above, the same applies to resin concrete, and needless to say, it can be widely applied to resin members.

[Brief description of drawings]

FIG. 1 shows the composition of resin mortar.

FIG. 2 shows the gel time measurement results for different sands.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C09K 17/48 P // E21D 11/10 Z (C04B 26/18 D 14:28 14:06 Z 24:42 Z 14:04) Z 111: 00 C09K 103: 00 (72) Inventor Takaki Sakurada 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Kiyoji Noro Yokohama City, Kanagawa Prefecture 1-chome Minato-cho, Yokohama City Sewerage Bureau (72) Inventor Shoichi Kumata 1-1-chome Minato-machi Naka-ku, Yokohama City, Kanagawa Prefecture Sewerage Bureau, Yokohama-shi (72) Inventor Chuya Igarashi 1 Minato-machi Naka City, Yokohama City, Kanagawa Prefecture 1 chome Yokohama City Sewer Bureau

Claims (3)

[Claims] 1. A resin member comprising a resin containing a hardening accelerator, an aggregate and a separation preventing material, wherein the aggregate has a metal ion component of impurities suppressed to 5% or less by weight percentage. . 2. A resin mortar comprising a resin containing a hardening accelerator, an aggregate and a separation preventing material, wherein the aggregate contains metal ion components of impurities in a weight percentage of 5% or less. . 3. A resin concrete comprising a resin containing a hardening accelerator, an aggregate and a separation preventing material, wherein the aggregate has a metal ion component of impurities suppressed to 5% or less by weight percentage. .