JPS6210809B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a molding material for formwork used for finishing uneven patterns on the inner and outer walls and retaining walls of buildings and structures, and for forming patterns on precast concrete boards, etc. The present invention relates to a method for producing a highly releasable molding material with excellent properties. [A] Prior Art Recently, when forming a patterned wall with an uneven pattern by molding, a formwork to which a pattern board made of a resin plate or the like, which can easily produce an uneven pattern, is attached is used. This formwork is generally a formwork having an uneven layer formed by pasting a pattern plate made of urethane resin, foamed resin, plastic, rubber, etc. onto a formwork substrate having a smooth surface. [B] Problems to be Solved by the Present Invention The conventional formwork described above has the following problems. (1) Formwork with an uneven layer has a larger surface area per unit area of the molding surface than formwork with a smooth surface.
Peelability during demolding becomes a problem. For this reason, conventionally, a releasable substance has been applied to the surface of the uneven layer each time a molding operation is performed. However, this process is not only labor-intensive but also expensive, and the thickness of the releasable material applied is limited.
It was extremely thin, less than 0.03mm. As described above, when conventional sebo or soap-like products are used, the peeling effect is lost after just one use. (2) In addition, even if the surface of the molding material such as formwork is coated with a peelable substance to a sufficient thickness,
As the number of uses increases, the amount of concrete, etc. adhering to the molding surface of the molding material also increases. As a result, the surface of the molded object after demolding becomes dirty, and the pattern board and the surface of the molded object are damaged, which is a problem especially in the case of concrete finishing. (3) When using a formwork in which the uneven layer is made of styrofoam resin, sufficient flexibility cannot be obtained and the mold is brittle. Therefore, application of a release material is limited to one-time use and cannot be used repeatedly, which is uneconomical. (4) As mentioned above, a molding material with an uneven layer on the molding surface requires a large peeling force because the contact area with the molded object is larger than when the molding surface is smooth. Therefore, it was necessary to interpose an adhesive between the substrate and the patterned surface, or to fix the two with nails or the like. Therefore, there were problems such as an increase in the manufacturing cost of the molded material. Furthermore, after several uses, the pattern board would expand and contract, become deformed, or lift off from the base, which required a lot of trouble to deal with. The present invention was made to solve the above problems, and is a highly releasable molding material that can be used repeatedly, has excellent durability, and provides good releasability without being restricted in the number of times it can be used. The purpose is to provide a manufacturing method for. [C] Means for solving the problems The molding material of the present invention is composed of the following composition materials. [Epoxy resin] A bisphenol A type epoxy resin that has an epoxy equivalent of 180 to 200 and is liquid at room temperature. [Curing agent] An aliphatic amine curing agent that can be reactively cured at room temperature, and the surface of the cured product is smooth and tends to cause bleeding. [Viscosity modifier] Silica, asbestos, calcium carbonate, etc. [Adjusting agent for adjusting curing time] 1. For accelerating curing at low temperatures (winter) In winter, the reaction is slow, so curing takes time, reducing work efficiency. For this purpose, it is necessary to accelerate the curing time, and the following curing accelerators are used. Alkylated phenol epoxy resin etc. 2. For delaying curing at high temperatures (summer) In summer, molding tends to be difficult because the reaction is too fast. Therefore, it is necessary to delay the curing time, and the following curing retarders are used. Phenoxy ether epoxy resin, etc. [Removal agent] 2 parts per 100 parts of epoxy resin, which is the main molding agent
~5 parts liquid fluorine resin or silicone resin, etc. The manufacturing method is to add an amine curing agent, silica, asbestos, calcium carbonate, etc. to the epoxy resin, and if necessary, add a curing accelerator or curing retardant that can adjust the curing time.
Further, a liquid fluorine resin is added and mixed to form a slurry release composition, and this composition is sprayed onto a substrate of a molding material to produce a molding material. [D] Example 1 Examples of formulations of release compositions are shown in Tables 1 and 2.

【table】

[Table] Next, the method for manufacturing the molding material will be explained. Stir and mix the A agent and B agent of Formulation Example 1 or 2,
Dilute the molding material 1 by 20% with xylol and apply it to the substrate 2 made of plywood or iron plate of the molding material 1 shown in Fig. 1.
Spray evenly over the entire surface. (Amount applied: 0.3
Kg/m ² ) Next, a mixture of agents A and B without diluting the xylol is sprayed so as to obtain the desired uneven pattern surface 3, and the mixture is reacted and cured. The surface of the pattern layer 4 thus formed is smooth and has good releasability because the release agent and hardening agent breathe to form a thin coating film. Moreover, unlike commercially available epoxy-based sprayed materials for wall finishing, this patterned surface 3 contains a large amount of epoxy resin and has appropriate flexibility and strength. Therefore, when this patterned surface 3 is used, for example, in a formwork for concrete, it can have a strength that will not be destroyed even by impact caused by pouring or demolding concrete. Next, pattern surface 3 and substrate 2 when demolding the molding material
Consider the adhesive strength of Table 3 shows the measurement data of the adhesive strength of the pattern layer 4 formed according to Formulation Example 2 when the substrate 2 is a plywood board or an iron plate.

[Table] Additionally, a vertical tensile strength test was conducted to determine the peeling force during demolding of concrete. The test results are shown in Table-4. In addition, in this test, the curing period from concrete pouring to demolding was 2 days in air at 20°C.

[Table] As is clear from Table 3, the adhesive force between the substrate 2 and the pattern layer 4 is greater than the peeling force during demolding.
There is no need to fix the pattern layer 4 and the substrate 2 with adhesive, nails, etc. as in the conventional case, and the pattern layer 4 does not easily peel off from the substrate 2 during demolding. Furthermore, as shown in Table 4, it is possible to easily peel off and demold concrete with a small force without applying a release agent. Next, the physical properties of the molded material 1 will be discussed. [Test Piece] The test pieces are as follows, and test pieces 1 to 4 used a commercially available wall decorative formwork material (Tokai Rubber Co., Ltd. "Mold Star"). 1 TSM-5: Urethane-based, 2 A-MPC: Urethane-based, glass fiber mixed 3 TSF: Foamed urethane-based 4 TSS-5: Styrofoam-based 5 Molding material according to the present invention: Shunju Blend NoP-33 (Blend Example 2) 6 Molding material according to the present invention: Winter formulation NoP-23 (Formulation example 1) The patterned surface of the above test piece was sanded and finished to a smooth thickness of about 6 mm. However, for No. 1 “TSM-5”, the thickness of one sheet is 2 mm.
Samples were made by laminating three layers using adhesive. In addition, the molding material according to the present invention was poured into a 6 mm thick mold on release paper, left to harden for 24 hours, and then
The sample was demolded and then cured at 60°C for 24 hours. [Hardness] Hardness was measured using a spring-type hardness tester (Type A) specified in JIS-K6301 "Vulcanized Rubber Physical Properties Test Method". The measurement results are shown in Table-5. [Bending strength] (Bending strength) Test piece supported at both ends (length 250 mm, width 70 mm,
A bending test was conducted by applying a load to the center of the span (approximately 6 mm thick). The measurement results are shown in Table-6. [Compressive Strength] A test piece (length 50 mm, width 50 mm, thickness 2 to 9 mm) was compressed to determine the compressive strength. The measurement results are shown in Table-7.

【table】

【table】

【table】

[Table] [Consideration of test results] Before comparing the physical properties of each specimen in terms of flexibility, compressive strength, and hardness, let's consider the requirements for molded materials when used as formwork materials. That is, in general, molding materials are required to meet the following requirements: 1) moderate strength, 2) flexibility, and 3) releasability. Since the removability has already been described, it will be omitted. Here we will consider strength and flexibility. From Table-5, the molding material according to the present invention (No.P-33,
23) is found to have sufficient strength compared to other commercially available specimens. It is not just a matter of high strength;
For example, it is sufficient to have a strength that does not deform against the pressure of poured concrete. Therefore, even if the molding material according to the present invention forms a deeply carved pattern surface 3, there is no fear that the convex portions will be crushed.
It has a feature that the shape of the pattern surface 3 can be easily maintained. Moreover, when demolding, the molding material is not peeled off all at once, but sequentially from one side. Therefore, as can be seen from Tables 6 and 7, it is clear that the molded material according to the present invention has excellent flexibility as it flexes with a much lighter weight than commercially available products. . Therefore, even if the shape is deeply carved, the molded material is easily deformed, so the concrete will not be damaged or the molded material will be damaged. Also, looking at the "strain rate" in Table 7, the smaller the strain rate, the harder it becomes, and it was found that both molded materials according to the present invention had a hard surface of "4.6%" compared to commercially available products. did. In this way, the molded material according to the present invention has both moderate flexibility and compressive strength, whereas distortion occurs in proportion to general flexibility, so it can be easily molded during molding. It is possible to maintain the shape of the molded material and prevent destruction of the molded material from impact during demolding. [E] Effects The molded material manufactured by the method for manufacturing a highly releasable molded material of the present invention has a hard surface and is easily bent, but is resistant to distortion and has appropriate compressive strength. Therefore, the following effects can be expected. (1) Since the patterned surface formed by spraying uses epoxy resin, it has sufficient compressive strength and can maintain the shape of the molded material. Therefore, the shape of the molded material is not crushed by concrete pressure during concrete pouring, and as a result, even complex shapes can be easily maintained without deformation. (2) Moreover, since the molded material according to the present invention is flexible, even if the molded material has a complicated shape or a deeply carved shape, the molded material will be moderately deformed and will not be affected by the impact etc. during demolding. It does not destroy the molded material and has excellent durability. (3) Since the composition is manufactured by mixing a release agent that enhances the release effect, not only can the conventional process of applying a release material be omitted, but also a high release effect can be obtained. Further, even if the number of diversions increases, high releasability can be maintained. (4) Good adhesion can be achieved by directly spraying the molding material onto the substrate and causing it to react and harden. Therefore, it is not necessary to interpose an adhesive between the substrate and the molding surface or to fix it with nails or the like as in the conventional case. (5) The viscosity when forming the molding surface can be adjusted by adding silica, asbestos, etc., so it is possible to obtain a good viscosity for spraying. Therefore, it is possible to prevent sagging during spraying and easily form a patterned surface that is a deeply carved molded surface.

[Brief explanation of the drawing]

FIG. 1: An explanatory diagram of a method for manufacturing a molded material according to the present invention. 1: Molding material, 2: Substrate, 3: Pattern surface, 4: Pattern layer.

Claims (1)

[Claims] 1. The main material is a molding material made by adding a curing agent to bisphenol A type epoxy resin, which has an epoxy equivalent of 180 to 200 and is liquid at room temperature, and to this main material, silica, A viscosity modifier such as asbestos or calcium carbonate, an alkylated phenol epoxy resin to accelerate curing, and a curing rate modifier such as phenoxy ether epoxy resin to delay curing are added, and a release agent is added to these. A method for producing a highly releasable molding material, which further comprises producing a stirred mixture, and spraying this product onto a base of the molding material to form a desired uneven layer.