JPH03103461A - Porous epoxy resin molded article - Google Patents

Abstract

PURPOSE:To obtain the title composition suitable as material of mold, filter medium, diffusing material, permeable membrane, especially mold for high- pressure slip casting, having excellent air permeation amount and tensile strength by curing an emulsion component comprising an epoxy compound, curing agent, emulsifying agent, water and specific filler. CONSTITUTION:An emulsion component comprising an epoxy compound (e.g. bisphenol A type diglycidyl ether) a curing agent (e.g. diethylenetriamine), an emulsifying agent (e.g. sorbitan fatty acid ester), water and a filler composed of acrylic beads subjected to surface treatment with a silane coupling agent is cured to give the objective molded article.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a porous epoxy resin or molded product that can be used in a wide range of applications such as mold materials, filtration materials, air diffusers, diaphragms, etc., particularly for high-pressure casting. The present invention relates to a porous epoxy resin molded product having a water flow rate suitable for use as a mold.

[Prior art and problems to be solved by the invention] Profile material,
Porous materials used for filtration media, air diffusers, diaphragms, etc.
Examples include sintered bodies of metal powder, thermoplastic resin powder, inorganic powder, etc., hydrated hardened bodies of plaster and cement, porous synthetic resins, etc., but from the viewpoint of dimensional accuracy, uniformity of pore distribution, durability, etc. Therefore, porous synthetic resins are preferably used.

As the porous synthetic resin, for example, JP-A-63-188O
f) Publication No. 3 discloses a porous epoxy resin molded product obtained by curing a certain mixed aqueous solution from an epoxy compound, a curing agent, an emulsifier, water or a mixture of water and a surfactant, and a filler. The above-mentioned surfactant is exemplified by a fluorine-based surfactant.

However, the resin molded product has problems such as a small amount of water passing through, and cannot be used as a mold for high-pressure casting.

Therefore, the present invention provides a porous epoxy resin molded product that can be used as a molding material, a filtering material, an aeration material, a diaphragm, etc., and that has a water passageway that is particularly required when used as a mold for high-pressure casting. The purpose is to provide.

[Means for Solving the Problems] In order to achieve the above object, the present inventors conducted intensive research and found that by using acrylic beads surface-treated with a silane coupling agent as a filler, porous The present invention was developed based on the knowledge that the amount of water passing through a high-quality epoxy resin is improved.

That is, the present invention provides an epoxy compound, a curing agent, an emulsifier,
A porous epoxy resin molded product obtained by curing an emulsion solution consisting of water and a filler, wherein the filler is acrylic beads surface-treated with a silane coupling agent. It is a thing.

As the epoxy compound, bisphenol A type diglycidyl ether, bisphenol F type diglycidyl ether, etc. are generally suitably used.

The above-mentioned compounds may be used alone or in combination of multiple types as required.

As a curing agent, diethylenetriamine (DETA),
Triethylenetetramine (TETA) and the like are preferably used. These curing agents may be used alone, or in combination if necessary. The amount of curing agent added is preferably 25 to 4 parts by weight per 100 parts by weight of the epoxy compound.
5 parts by weight, most preferably 35 parts by weight.

As the emulsifier, sorbitan fatty acid ester, polyoxyethylene oleyl ether, etc. are used. These emulsifiers may be used alone or in combination if necessary.

The amount of water added is the total amount of epoxy compound and curing agent 10
It is preferably 30 to 50 parts by weight relative to 0 parts by weight.

As the filler, acrylic beads are used, preferably having an average particle size of 80 to 120 μm. The amount of acrylic beads added is 80 to 1 per 100 parts by weight of the epoxy compound.
20 parts by weight is preferred.

As the silane coupling agent, 3-aminopropyltriethoxysilane, 3-glycidoxypyltriethoxysilane, etc. are preferred. The above-mentioned compounds may be used alone or in combination of multiple types as required. The amount of the silane coupling agent added is preferably 0.5 to 2 parts by weight per 100 parts by weight of acrylic beads.

The resin shaped product of the present invention is obtained by curing an emulsion solution consisting of acrylic beads surface-treated with the above-mentioned epoxy compound, curing agent, emulsifier, water, and silane coupling agent.

Although the method of curing the emulsion solution is not particularly limited, an example is given below.

Pour the emulsion solution into a resin plaster mold coated with a sealing resin and further coated with a hydrophobic mold release agent for 50 minutes.
Heat to ℃ to semi-cure and demold.

Next, this semi-hardened mixture is placed in water and washed with water using a vacuum deaerator to wash away the emulsifier and the like remaining in the mixture.

Furthermore, the water-washed mixture is heated to 60° C. to completely cure it to obtain a resin molded product.

[Examples] Hereinafter, the present invention will be specifically explained based on Examples and Comparative Examples. In addition, in the following description, parts mean parts by weight.

Examples 1 to 9 (Surface treatment of acrylic beads) Into 75 parts of water, acrylic beads (particle size 100 μm 1, trade name: Dianal BR Resin BR-8) were added in an amount shown in Table 1.
7, manufactured by Mitsubishi Rayon ■ Co., Ltd.), and further added 1 part of the silane coupling agent shown in Table 1 (manufactured by Chisso Co., Ltd.) per 100 parts of acrylic beads.

After that, discard the tap water and add 60 to 80 acrylic beads.
After drying by keeping at a temperature of about 12 hours, the beads are classified through a 42-mesh sieve to complete the surface treatment of the acrylic beads.

(Preparation of emulzidine solution) In 20 parts of water, add 1 part of a modified epoxy compound (trade name: Incast TR-100, manufactured by NI Technical Lab ■).
00 parts and stirred for about 1 minute to prepare a uniform emulsion solution a.

Meanwhile, 35 parts of modified aliphatic polyamine (trade name: Incast TI-104, manufactured by NI Technical Lab), which is a curing agent, was added to 20 parts of water per 100 parts of the epoxy compound, and the mixture was stirred for about 1 minute. Prepare a uniform emulsion solution b.

Further, the solution a and the solution b are mixed and stirred for about 1 minute to prepare a uniform emulsion solution C.

The total amount of water used in preparing solution a and solution b is 4
This is 30 parts when the total amount of the epoxy compound and curing agent is 100 parts.

(Curing of a mixture consisting of an emulsion solution and a filler) Surface-treated acrylic beads were added to the solution C, stirred for about 1 minute to form a homogeneous mixture, and immediately mixed into a plaster case coated with a mold release agent. Pour into mold.

The injected mixture was kept in a dryer at 50°C for 3 hours, then demolded, placed in water, and defoamed for about 6 minutes with a vacuum defoamer.
Wash with water. The water-washed mixture is kept in a dryer at 60° C. for 4 hours or more.

In the above operation, the epoxy compound, curing agent, filler, and water are kept at a temperature 5° C. or more higher than room temperature.

The resulting resin molded product has a thickness of 20111+1 and a diameter of 80 m.
The material was processed into a disk shape, and 4 kg/cd of pressurized water was loaded onto it to measure the water flow rate. The results are shown in Table 1 and Figure 1.

In addition, we processed the resin moldings to a thickness of 10all 1%, a width of 10m, and a length of 90m, and measured the tensile strength.
It is shown in the table and FIG.

Comparative Examples 1-3 Examples 1-3 except that the acrylic beads were not surface treated
In the same manner as above, epoxy resin molded products were obtained using the acrylic beads shown in Table 1.

Various measured values regarding Comparative Examples 1 to 3 are shown in Table 1 similarly to Examples 1 to 3. Further, for Comparative Examples 2 and 3, the water flow rate is shown in FIG. 1, and the tensile strength is also shown in FIG. 2, respectively.

As shown in Table 1, the resin molded products of Examples 1 to 9 meet the requirements of 5. It has a water flow rate of Oj/min or more. Further, the tensile strength is 32K9/C or more, which is also a value sufficient for use as a mold for high-pressure casting.

On the other hand, the resin molded products of Comparative Examples 1 to 3 have water flow rates of 2.8 to 4.14/min, and therefore cannot be used in certain molds for high-pressure casting.

In addition, Examples 2, 3, 5, 6, and 8 are shown in FIGS. 1 and 2.
. The superiority of water permeation and tensile strength compared to the above becomes clearer.

[Effects of the Invention] As explained above, the resin molded product of the present invention has excellent water flow rate and tensile strength, and can be used as a mold material, a filter material, an aeration material,
It can be used in a wide range of applications such as diaphragms, and is particularly suitable for use as a mold for high-pressure casting.

[Brief explanation of drawings]

FIG. 1 is a graph showing the amount of water passed through the resin molded products of Examples 2, 3, 5, 6, 8, and 9 and Comparative Examples 2 and 3. 5 is a graph showing the tensile strength of resin molded products of Comparative Examples 5, 6, 8, 9 and Comparative Examples 2 and 3.

Claims (1)

[Claims] 1. A porous epoxy resin molded product obtained by curing an emulsion solution consisting of an epoxy compound, a curing agent, an emulsifier, water, and a filler, and the filler is an acrylic bead whose surface has been treated with a silane coupling agent. The resin molded article characterized in that: