JPS5822061B2 - Adhesive for fuel filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel filter adhesive applicable to alcohol-added gasoline.

In recent years, in an effort to curb gasoline consumption in response to tight crude oil supplies, efforts have been underway to develop gasoline with alcohol added as fuel for automobiles, and some have already reached the stage of commercialization.

This type of automobile fuel is a mixture of methyl alcohol, ethyl alcohol, etc. at a ratio of about 20% by weight to gasoline, and is made of epoxy resin, which is conventionally used as an adhesive in fuel filters. When used, the alcohol component in the fuel causes significant swelling or cracking in the adhesive layer, which sometimes accompanies peeling of the filter paper and the filter case, making it impractical for practical use.

In view of these circumstances, the inventors of the present invention have conducted intensive research and testing to obtain an adhesive that has sufficient durability against alcohol-added gasoline and has excellent workability. 4-diamino-6 (1 2'-alkylimidazolyl) ethyl-5-1-riazine or 2,4-diamino-6 (2'-fulkylimidazolyl (1) ethyl-s-triazine isocyanuric acid addition It was discovered that the intended purpose could be achieved by using an epoxy resin adhesive containing the following compounds.

Among conventionally known epoxy resin adhesives for fuel filters, one-component type adhesives that use dicyandiamide as a curing agent usually have a curing reaction of 170 to 180°C.
It is necessary to heat the paper to a temperature of However, according to the adhesive of the present invention, the curing reaction proceeds completely at a relatively low temperature of about 120°C, and the cured adhesive layer is resistant to gasoline and alcohol mixtures. It has extremely good corrosion resistance against both alcohol components.

Typical curing agents suitable for carrying out the present invention include 2
・4-diamino-6 (2'-methylimidazolyl (1) ethyl-8-triazine, 2,4-diamino-6 (2
'-ethylimidazolyl(10)ethyl-8-triazine, 2,4-diamino-6(2'-undecylimidazolyl))ethyl-3-)riazine, 2,4-diamino-6(2'-ethyl- 47-methylimidazolyl (1) ethyl-8-) riazine, 2,4-diamino-6 (2
'-Undecyl-4'-methylimidazolyl (1'l)
Ethyl-8-1-1,1 azine and isocyanuric acid adducts thereof, 3 to 15 parts by weight, preferably 5 to 15 parts by weight, per 100 parts by weight of aromatic, aliphatic, or alicyclic epoxy resin. 7 parts by weight, and when mixing the epoxy resin and curing agent, a known reactive diluent may be added to adjust the viscosity, and calcium carbonate, silica, and titanium oxide may be used as fillers. , Aerosil, etc. can be added.

Another thing to note about the present invention is that the epoxy resin adhesive containing 2,4-diamino-6-(2'-alkylimidazolyl))ethyl-8-)riazine or its incyanuric acid adduct can be used indoors. It is a so-called latent curing agent that does not undergo a curing reaction and is cured by heating above a predetermined temperature.- It can be formed as a mold, so it improves workability and adhesive performance when bonding fuel filters. This is an extremely uplifting point.

The present invention will be specifically explained below with reference to Examples and Reference Examples.

In addition, the units of the following numerical values are shown in parts by weight unless otherwise specified.

Example 1 Epibis type liquid epoxy resin (trade name “Epomic R-
140J: manufactured by Mitsui Petrochemical Epoxy) 50 parts of calcium carbonate, 1 part of thixotropic agent (trade name [Aerosil 200J: manufactured by Nippon Aerosil),
5 parts of titanium oxide and 2,4-diamino-6 as a hardening agent
(2'-Methylimidazolyl (1) ethyl-8-) 5 parts of riazine were kneaded in a three-roll mill to produce an epoxy resin.
A molded adhesive was formed.

When this product was stored at a temperature of 25°C and its viscosity change was measured, it was found that it took approximately 60 days for the viscosity of the adhesive to rise to twice its initial viscosity (hereinafter referred to as pot life). Thickness 1.6mrIL, width 25'm71L,
A steel plate with a length of 100m71 is glued with a lap length of 10 times,
A plate-shaped test piece obtained by heating and curing at a temperature of 120°C for 40 minutes and the adhesive was poured into a mold with a thickness of 3 myn and a size of 30 mm x 30 mm, and cured under the above-mentioned curing conditions. Weight%, ethyl alcohol 20
Changes in physical properties when immersed in a mixed solution of % by weight at a temperature of 60°C for a predetermined period of time were as follows.

In addition, a fuel filter was formed using this product, and the product was cured at a temperature of 120°C for 40 minutes, and then immersed in the above mixture at a temperature of 60°C for 400 hours. No swelling, cracking, or peeling of the paper was observed.

In this example, the curing agent 2,4-diamino-6 (2'-
Methylimidazolyl)) Ethyl-3-I) Instead of azine, 2,4-diamino-6(2'-ethylimidazolyl))ethyl-8-)riazine, 2,4-diamino-6(2' -undecylimidazolyl (one) ethyl-
8-) riazine, 2,4-diamino-6(2'-ethyl-4'-methylimidazolyl))ethyl-s-triazine and 2,4-diamino-6(2'-undecyl-4)
When similar tests were repeated using each of the following azines, the results were almost the same as in this example.

Example 2 Epibis type liquid epoxy resin (product name Ko Pico) 828
: manufactured by Yuka Shell Epoxy) and 20 parts of Epibis type solid epoxy resin (trade name Epicoat 1001 manufactured by Yuka Shell Epoxy) were heated and mixed at a temperature of 100°C, and after cooling, reactive diluent (trade name Adeka) was mixed. glycyol ED 50
3 Asahi Denka) 10 parts, 50 parts of silica, Aerosil #20
0.1 part, 5 parts of titanium oxide, and 2,4-diamino-6(2'-methylimidazolyl(P))ethyl- as a curing agent.
Five parts of the 8-triazine isocyanuric acid adduct were kneaded in a three-roll mill to obtain a one-component epoxy resin adhesive.

The pot life of this product is approximately 6 months, and the results of the same test as in Example 1 are shown in the table below.

In addition, a fuel filter was formed in the same manner as in Example 1, and
No abnormality was observed even after immersion for a period of time.

Furthermore, 10 heat cycles of -40°C to 80°C were performed, but no abnormality was found on this platform.

In this example, the curing agent 2,4-diamino-6 (2'-
Methylimidazolyl)) 2,4-diamino-6 (2
Ethyl-8-1 riazine isocyanuric acid adduct, 2,4-diamino-6-(2'-
undecylimidazolyl (1) ethyl-s-triazine isocyanuric acid adduct, 2,4-diamino-6 (2'
-ethyl-47-methyl-47-methylimidazolyl)) ethyl-8-triazine isocyanuric acid adduct and 2,4-diamino-6(2'-undecyl-4'-methylimidazolyl)ethyl-3- ) Similar tests were repeated using each of the riazine isocyanuric acid adducts, and all of them showed substantially the same results as this example.

Reference example 1 Epibis type epoxy resin (Product name Ko Pomic R-140
), 1 part of Aerosil #200, and 5 parts of titanium oxide were kneaded in a three-roll mill, and used as the main ingredient.
, manufactured by Mitsui Petrochemical Epoxy) 31 parts, calcium carbonate 7
Mix 5 parts thoroughly in a mixer and use 2 parts as a hardening agent.
A liquid poxy resin adhesive was obtained.

A fuel filter was formed using a mixture of 100 parts each of the main agent and curing agent, and the mixture was cured at room temperature for 24 hours.

When the obtained fuel filter was immersed in a gasoline-alcohol mixture at a temperature of 60°C in the same manner as in Example 1, significant swelling of the adhesive and peeling of the f paper occurred in about one day, resulting in a state where it could not be used. .

Claims (1)

[Claims] 1 As a curing agent 2,4-diamino-6(2'-alkylimidazolyl(1'))ethyl-8-1-riazine or 2,4-diamino-6(2'-alkylimidazolyl(1))ethyl-8 - A fuel filter adhesive comprising an epoxy resin composition containing a triazine/isocyanuric acid adduct.