JPH03212477A - Flame-retardant sealing material - Google Patents

Abstract

PURPOSE:To obtain a sealing material containing a liquid polychloroprene, liquid polyurethane and hydrated metal oxide at a specific ratio, having good weather resistance and adhesion as well as excellent flame-retardation and fire resistance and suitable for construction. CONSTITUTION:The objective sealing material consisting of 100 pts.wt. liquid polychloroprene (preferably having 3500-10000 number-average molecular weight, 30000-150000cp Brookfield viscosity and hydroxyl group) and 50-500 pts.wt., preferably 100-250 pts.wt. liquid polyurethane [preferably two pack type consisting of isocyanate and polyol and being (0.7/1.0)-(1.5/1.0) in a weight ratio of the former/the latter] and 50-500 pts.wt., preferably 100-250 pts.wt. hydrated metal oxide (preferably magnesium hydroxide surface-treated with a silane coupling agent). Furthermore, 5-100 pts.wt. flame-retardant is preferably further added to the above-mentioned sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a flame-retardant sealing material that can be used in various fields, and is particularly suitable for architectural use.

[Conventional technology]

Urethane-based, acrylic-based,
However, urethane-based and acrylic-based sealants generally have poor flame retardancy, while silicone-based sealants generally have poor weather resistance, especially against black stains caused by mold and mortar. There are problems such as insufficient adhesion to.

[Problems that need to be solved]

In consideration of the above circumstances, the present invention aims to develop a sealing material that has good weather resistance (black staining due to mold) and adhesion to mortar, etc., and is also excellent in flame retardancy and fire resistance.

[Means for solving problems]

The above problem is solved by the flame retardant, which is characterized by comprising liquid polychloroprene, 50 to 500 parts by weight of liquid polyurethane, and 50 to 500 parts by weight of hydrated metal oxide per 100 parts by weight of the liquid polychloroprene. This problem can be solved by using adhesive sealant.

[Effect]

The sealant of the present invention has good weather resistance, adhesion, and flame retardancy due to the interaction between the ingredients, and also has good self-curing properties in the atmosphere after being applied to a desired location. Even after combustion, the ash after combustion retains its pre-combustion form and exhibits fire resistance and spread prevention properties even in the ash state.

As liquid polychloroprene, for example, a number average molecular weight of about 1,000 to 100,000, especially 3.500 is used.
~10.000, Brookfield viscosity at room temperature is 10.000~200. OOOcp, especially 30,00
A nonvolatile liquid having a concentration of 0 to 150.0 Ocp is used, and one having one or more hydroxyl groups at the end or in the molecule is particularly preferred.

Examples of liquid polyurethanes include common two-component polyurethanes consisting of isocyanate and polyol. In that case, the weight ratio of isocyanate to polyol is the former/
The latter ratio is suitably in the range of 0.5/], 0 to 2.0/1.0, preferably 0.7/1.0 to 1.5/1.0. As the isocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and urethane prepolymers of the above-mentioned isocyanates are used, and commercially available products have EC26
10B (Polyurethane Kasei Co., Ltd.), UR [CN-202
3 (Ito Oil Co., Ltd.) is exemplified.

Examples of polyols include low molecular weight polyols (ethylene glycol, diethylene glycol, dipropylene glycol, 114-butanediol, etc.), polyether polyols (polyethylene glycol, polyoxypropylene glycol, ethylene oxide-propylene oxide copolymer, etc.), and polyester polyols (polyethylene glycol, polyoxypropylene glycol, ethylene oxide-propylene oxide copolymer, etc.). β-methyl-δ-)hererolactone, polycaprolactone, polyester from diol dibasic acid, etc.), silicone polyol, castor oil, etc. are used, and commercially available products have an EC261
OA (Polyurethane Kasei Co., Ltd.), LIRICH-30 (
Ito Oil Co., Ltd.) is an example.

As the hydrated metal oxide, an agent that exhibits a flame retardant effect through a dehydration reaction at high temperatures is used, such as magnesium hydroxide, aluminum hydroxide, and the like. The hydrated metal oxide has an average particle size of 0.05 to 50 μm, especially 10 μm.
Fine particles of micrometers or less are preferred. The hydrated metal oxide may or may not be surface-treated, but surface-treated ones are generally preferable because they give good results in properties such as dispersibility in the material of the present invention and fire resistance. Particularly preferred hydrated metal oxides are magnesium hydroxide surface-treated with saturated fatty acids, unsaturated fatty acids, silane coupling agents, titanium coupling agents, and silicon oligomers.

In the present invention, ordinary flame retardants, colorants, processing aids, antioxidants, adhesive agents, etc. may be added in addition to the above-mentioned components. In particular, it is preferable to incorporate common flame retardants and adhesive agents to improve flame retardancy and adhesive properties, respectively.

Common flame retardants include inorganic flame retardants such as antimony trioxide, zinc borate, red phosphorous, lead borosilicate, decabromodiphenyl oxide, tribromophenol, tetrabromobisphenol A, tetrabromokiln, brominated polyols, and dibromodiphenyloxide. Halogen-based organic flame retardants such as neopentyl glycol, perchloropentacyclodecane, and chlorinated paraffin; organic phosphorus-based flame retardants such as phosphoric acid esters, condensed ammonium phosphates, melamine phosphates, polyphosphoric acid carbamates, and aliphatic phosphonic acid esters. etc. are exemplified.

Examples of adhesive agents include adhesives such as tackifiers, Nran compounds, titanium coupling agents, and reactive silicone oligomers.

Regarding the amount of each component used, the amount of liquid polyurethane used is 50 to 500 parts by weight, particularly 100 to 250 parts by weight, per 100 parts by weight of liquid polychloroprene. If it is less than 50 parts by weight, self-curing properties in the atmosphere after application to a desired location will be poor, while if it is more than 500 parts by weight, flame retardancy will be reduced.

The amount of hydrated metal oxide is from 50 to 500 parts by weight, in particular from 100 to 400 parts by weight, per 100 parts by weight of liquid polychloroprene. If it is less than 50 parts by weight, flame retardancy will be poor, while if it is more than 500 parts by weight, elongation properties and adhesive properties will be reduced.

When using a common flame retardant as described above, the physical properties of the sealing material of the present invention will be deteriorated if an excessive amount is used, so the amount used is 1 per 100 parts by weight of liquid polychloroprene.
00 parts by weight or less, particularly preferably 5 to 70 parts by weight. Within this range, the flame retardance and fire resistance of the sealing material of the present invention can be further improved without adversely affecting the weather resistance and adhesiveness.

〔effect〕

As described above, the sealing material of the present invention has various excellent performances and is inexpensive, so it is extremely useful as a sealing material for various fields, especially for construction.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, and at the same time, the excellent effects of the present invention will be shown. All numerical values below are parts by weight or weight %.

Examples 1 to 8, Comparative Examples 1 to 3 Each component shown in Table 1 was thoroughly mixed in the amount ratio shown in the same table using a triple roll, and the seals of Examples 1 to 8 and Comparative Examples 1 to 3 were prepared. I got the material.

Next, the characteristics of each sealing material were evaluated by the method shown below. The results are shown together in the same table.

Self-curing property: Immediately after thorough mixing using a triple roll, the sealing material obtained is formed into a sheet with a thickness of 1 m+w and left in the air at room temperature for 24 hours, and the degree of curing is then examined. If there is some damage, mark it as ×, and if there is no damage, mark it as ○.

Mechanical properties: A No. 3 Dangel specified in JIS K6301 is punched out from the sheet obtained in the above self-curing test after being left in the atmosphere for 24 hours, and a tensile test is performed on it.

If the elongation is less than 100%, it is marked as ×, and if it is more than 100%, it is marked as ○.

Flame retardancy: Oxygen index is measured according to the method specified in JIS K7201.

Fire resistance: A sample with dimensions and shape of 3 mm thick, 50 nm long, and 6 mm wide is burned and incinerated in a burner at approximately 1000°C for 5 minutes. A sample that ashes while retaining its pre-combustion shape or a shape close to it is rated as ○, and a sample that loses its shape significantly due to combustion is marked as ×.

Weather Resistance Each composition was left to stand at room temperature for 24 hours to cure, and then exposed using a sunshine weather meter for 2000 hours. Those with black contamination due to mold are marked as ×, and those with no mold growth are marked as ○.

Adhesion: After pre-treating the mortar block with a urethane primer, each composition was coated to a thickness of 2 fl and a width of 10 m1, and after being left in a room for 24 hours, the presence or absence of peeling between the mortar and each composition was determined. The sealing material was evaluated as uncured and stretched, the sheet was brittle and peeled off easily, and the sheet was evaluated as ×, and the sheet that was not easily peeled off as ○.

[Icho margin]

Claims (2)

[Claims] (1) A flame-retardant sealing material comprising liquid polychloroprene, 50 to 500 parts by weight of liquid polyurethane, and 50 to 500 parts by weight of a hydrated metal oxide per 100 parts by weight of the liquid polychloroprene. (2) 5 to 100 parts by weight of liquid polychloroprene
A flame-retardant sealant according to claim 1, further comprising 100 parts by weight of a conventional flame retardant.