JPH0517731A - Room temperature curable composition having good stringing resistance - Google Patents

Abstract

PURPOSE:To provide a room temperature curable composition having good stringing resistance and workability. CONSTITUTION:An inactive gas (e.g. nitrogen, carbon dioxide, argon or dry air) is added to a room temperature-curable composition comprising a reactive liquid rubber organic polymer, a curing catalyst and a filler for the polymer. The reactive liquid rubbery polymer includes an organic polymer having at least one reactive silicon-containing group, a urethane prepolymer having an inocyanate group and a mercapto group-containing modified polysulfide resin. When the modified polysaccharide resin is used, the dry air can not be applied as the inactive gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room-temperature-curable one-component adhesive or sealing agent filled in a container such as a cartridge and having a good thread breaking property during application.

[0002]

2. Description of the Related Art Generally, rubber-based organic polymers (modified silicone resin, silicone resin) containing reactive silicon in the molecule are well known, and form a siloxane bond between the molecules due to moisture in the air. Crosslinks. The urethane prepolymer containing an active isocyanate group also forms a urea bond due to moisture in the air or the like and undergoes a crosslinking reaction. Further, the modified polysulfide resin has an active mercapto group and undergoes a crosslinking reaction by oxygen in the air.

Usually, these resins are used as one-component or two-component adhesives or sealing agents by adding a curing catalyst, a filler and the like. Such room temperature curable compositions are excellent in heat resistance, cold resistance, chemical resistance and stain resistance, and are widely used for electronic devices, automobiles, construction civil engineering, and the like.

However, the yarn breakage during coating is poor,
There was a disadvantage that the surface of the adherend around it was stained.

Therefore, conventionally, in order to improve the thread breaking property of such a composition, a thixotropic agent such as soft calcium carbonate, hydrogenated castor oil, anhydrous silica or the like, or a defective portion such as silica sand. Compositions with added fillers are known.

[0006]

However, in the case of a composition to which a thixotropic agent such as soft calcium carbonate, hydrogenated castor oil, or anhydrous silica is added, the thread breaking property cannot be sufficiently improved, and silica sand is used. In the case of a composition added with a filler which becomes such a defective portion, the yarn breakability is improved, but the workability and the cured physical properties are inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a room temperature curable composition having good thread breakage during application and good workability.

[0008]

A room-temperature curable composition having good thread-breaking properties according to the present invention comprises a reactive liquid rubber organic polymer, a curing catalyst for the reactive liquid rubber organic polymer, and a filler. A room temperature curable composition comprising the addition of and, in which an inert gas is included.

As the reactive liquid rubber organic polymer, an organic polymer having at least one reactive silicon-containing group (silicone resin, modified silicone resin), urethane prepolymer having isocyanate group, modified polysulfide having mercapto group. Resin etc. are mentioned.

As the inert gas, various ones such as dry air, nitrogen, carbon dioxide and argon can be used, but nitrogen gas is preferably used from the viewpoint of easy handling. However, dry air cannot be applied to the modified polysulfide resin.

[0011]

According to the composition of the present invention, an inert gas is contained in a composition comprising a reactive liquid rubber organic polymer, a curing catalyst for the reactive liquid rubber organic polymer, and a filler. Therefore, the inert gas is dispersed as fine defects in the composition without curing the composition.

[0012]

EXAMPLES Examples of the present invention will be described below.

[0013]

Example 1 100 parts by weight of a modified silicone resin (manufactured by Kanegafuchi Chemical Co., Ltd .: Cyril M400), 0.5 part by weight of a curing catalyst (manufactured by Sansha Machinery Co., Ltd .: SB65), and a sufficiently dried filler (calcium shiraishi) Company: Calfine 200M) 100
The parts by weight were sufficiently kneaded with a planetary mixer in an atmosphere of dry air to obtain a mixed composition containing dry air.

Evaluation of Thread Breakability The above-mentioned mixed composition was filled between the end faces of two steel cylinders having a diameter of 20 mm with a thickness of 3 mm, and both steel cylinders were connected by this mixed composition. Then, the thread breakability was evaluated by measuring the distance from the cut end when the mixed composition applied by pulling apart the steel cylinder was cut to the end face of the steel cylinder. The results are shown in Table 1.
Shown in.

Evaluation of Storage Stability The mixed composition was sealed in a cartridge and stored at 50 ° C. for 1 week, and then the state was observed. The results are shown in Table 1.

◯: No abnormality ×: curing

[0017]

[Example 2] Example 1 except that a nitrogen gas atmosphere was used.
A mixed composition was obtained in the same manner as in. In addition, similar tests were conducted for evaluation of yarn breakability and storage stability. The results are shown in Table 1.

[0018]

[Example 3] Example 1 except that the atmosphere was carbon dioxide
A mixed composition was obtained in the same manner as in. In addition, similar tests were conducted for evaluation of yarn breakability and storage stability. The results are shown in Table 1.

[0019]

Comparative Example 1 A mixed composition was obtained in the same manner as in Example 1 except that the atmosphere was normal air. In addition, similar tests were conducted for evaluation of yarn breakability and storage stability. The results are shown in Table 1.

[0020]

Comparative Example 2 The mixed composition obtained in Comparative Example 1 was vacuum degassed to obtain a mixed composition. In addition, similar tests were conducted for evaluation of yarn breakability and storage stability. The results are shown in Table 1.

[0021]

[Table 1]

[0022]

As described above, according to the present invention, it is possible to disperse an inert gas as fine defects in the composition without curing the composition, so that the storage stability and the yarn are improved. The room-temperature curable composition has excellent cuttability.
Therefore, at the time of application, the application work can be performed without being applied to a predetermined part without being soiled in an unnecessary part.

Claims (2)

[Claims] 1. A room temperature curable composition comprising a reactive liquid rubber organic polymer, a curing catalyst for the reactive liquid rubber organic polymer, and a filler, the composition comprising: A room-temperature curable composition having good thread-breaking properties, characterized in that an inert gas is included therein. 2. The room-temperature curable composition having good thread breaking property according to claim 1, wherein the reactive liquid rubber organic polymer is other than the modified polysulfide resin and dry air is used as the inert gas.