JPS60903A - Manufacture of concrete formwork - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Part 114 of this article relates to a method for manufacturing concrete formwork.

More specifically, the present invention relates to a method for manufacturing a concrete formwork that does not allow concrete to adhere to the formwork, has a flat concrete surface, and can be easily removed when viewed from the concrete surface.

Conventionally, metal! ! ! The frame, wooden formwork or plastic formwork is used, but in the above construction and when removing these formworks after the completion of manufacturing, the 1M frame will be removed from the concrete surface by nt, hK<<, demolding7 Various disadvantages can be seen, such as manual labor required for % work, concrete material after removal of IM being immersed in the formwork and cutting, and the surface of concrete after removal from the mold becoming colored and spoiling the aesthetics. . Particularly, as mentioned above, when concrete moths adhere to the formwork, it becomes labor-intensive to clean the concrete to remove it.

Therefore, conventionally, when using various formworks, its size
It is customary to apply an Ic type agent.

However, although some of the IT-type agents currently on the market have sufficient performance under various conditions, there are cases where, for example, when using soapy water or mineral oil, spots may appear on Kodocrete. Also, if machine oil or waste oil from mobi oil is used, the surface of the concrete will be colored and the appearance will be impaired. In addition, when applying cement mortar or coating P1 to a concrete surface after using these mold release agents, there are also problems such as poor adhesion of these agents.

Final EJi person #FFi Focusing on the above-mentioned current situation, we have conducted extensive research with the aim of overcoming the current situation.As a result, there is no need to apply a mold release agent when using a mold ear, and there is no need to apply a mold release agent.
! 1) Concrete rr does not adhere to the formwork,
Finishes the concrete surface smoothly, is extremely easy to remove from the concrete surface, is water resistant, is easily resistant to 1liJ alkalinity, does not break through concrete Ic I/L, and does not affect the hardening reaction of concrete. We have developed a method for manufacturing concrete formwork.This has made it unnecessary to clean the formwork after each use, making it possible to use the formwork repeatedly.

The unreleased J will be explained in detail below.

(1) In the production of concrete formwork, a composition containing a fluorine-containing polymer having hydroxyl groups in the molecule and a curing agent as essential components is used to prepare the contact area of the formwork with concrete. Concrete I characterized by covering
! l!漜の袈Jum method, (2) In addition to the essential ingredients in (1) above, a composition containing a finely powdered fluorine-containing polymer as an essential ingredient is used to coat the contact area of the formwork with concrete. This is a method for manufacturing concrete formwork characterized by the following.

-eK, combined 7-polymers have the properties of a small static friction coefficient & and a large contact angle. Therefore, when concrete formwork is coated with a fluorine-containing polymer, there is less smearing of the concrete. However, based on this idea, the inventors of the Wooden Co., Ltd. developed a method using polytetrafluoroethylene, a fluorine-containing polymer that has traditionally been used for coating. Concrete formwork was coated with vinylidene chloride and used for trials, but the results were not satisfactory. Judging from this, it is not possible to interpret only the Vtl ij between concrete peeling, static friction coefficient, and contact angle, but also the coating's (?J!+a and flat fit). Polytetrafluoroethylene and polypinyligne fluoride I'i
Because the heat is 1, the hardness of the coating is low 1.Therefore, it is easy to get lag during use, especially when using ttit.
Concrete quality (-1) is often applied to Kata Iku. Also, the film has poor smoothness and has a mirror-like surface with no Q, so-called ground glass. This also causes damage to the peeling of concrete. Conceivable.

The inventors completed the present invention based on the viewpoint that a fluorine-containing polymer coating with high hardness and smoothness is most suitable for concrete formwork.

A typical example of a fluorine-containing polymer having a hydroxyl group in the molecule used in undeveloped Iv4 is that disclosed in JP-A-57-84107. It has hydroxyl groups and other polar groups for M properties, adhesion when formed into a film, and I-I ability to cross-bond and become three-dimensional.
It is preferable to have a hydroxyl weight of 20 to 200. (This type of fluoropolymer is available from Asahi Glass Co., Ltd. Lumiflon 1
(It is commercially available under the trade name ``.'') Curing agents used for curing these fluoropolymers include amino acids such as butylated melamine 4#Ill'?, methylated melamine resin and butylated urea resin. Plast is useful, and polyvalent isocyanates such as hexamethylene diisocyanate and inphorone diisocyanate, their iridized products, and blocked polyvalent incyanates can also be used.Curing agent used in the present invention In the case of aminoplast, the ratio of fluoropolymer/curing agent to the fluorine-containing polymer is 9778 to 50/I)
0 (gray surface ratio) is preferable. In this case, 100°C is used for curing.
~200cc of heating is required. When polyvalent incyanates are used, it is preferable that the hydroxyl group of the fluoropolymer/the NCO of the curing agent be 0.5 to 2.0 (the value ρ). In this case, curing is usually iiJ at t11, and heating is also possible at I/-1°. However, when using block polyhedral isocyanates, heating to the temperature required for solution 1 of the blocking agent is necessary.

As described above, the fluorine-containing polymer used in the present invention is characterized in that it is cured by the reaction between the 41 hydroxyl groups in the molecule and the curing agent, resulting in a three-dimensional structure. Therefore, the coating W! The temperature is high and there is no softening when heated.

The film also has mirror-like smoothness and exhibits excellent water and alkali resistance. Another feature of the group 1 material used in the present invention is that, as mentioned above, it is soluble in various organic solvents before it is hardened. This makes the coating operation much easier. That is, the coating material may be diluted with an organic solvent to provide properties suitable for each coating method, such as appropriate viscosity, appropriate solid content, and appropriate solvent volatilization, and then coated and then cured.

As a method of coating the formwork, known methods such as spray coating, electrocoating, 70-coater coating, and brush coating are suitable.

Further, depending on the type of curing agent, curing can be performed not only by heating but also at room temperature, which expands the scope of use of the present invention.

It is also possible to incorporate color pigments and other paint additives into the composition used in the present invention, thereby making it possible to form a colored film.

In order to make the present invention even more effective, a finely powdered fluoropolymer can be blended into the composition with fluorine containing hydroxyl groups. 14) When blending the final fluoropolymer, reduce the static friction coefficient of the coating and increase the contact angle,
It is highly effective in preventing concrete from adhering.

Examples of the finely powdered fluorine-containing hexamer used in the final IJIJ include fine powders of polytetrafluoroethylene, polytrifluorochloroethylene, polyvinylidene fluoride, polyvinyl heptafluoride, and the like. In addition, the blending ratio is
The amount is preferably 5 to 100 parts by weight per 100 parts by weight of the fluorine-containing polymer having a hydroxyl group in the molecule. If it is less than 5 parts by weight/p%, there will be no increase in the prevention of adhesion of concrete (ICQ9), and if it exceeds 100 parts by weight, the smoothness and hardness of the coating will decrease, so the effect of preventing adhesion of concrete will decrease. decreases.

It is preferable that the particle size of the finely powdered fluorine-containing polymer (1) is 20 μIn or less; if it exceeds 20 μm, the smoothness of the coating will deteriorate to JL4, resulting in little effect.

When manufacturing concrete forms by the method according to the invention, form 4'! It is preferable that a coating of the composition used for the final IJ be formed on the surface of the IJ with a thickness of at least 15 μm. Therefore, it is also possible to directly cover the formwork.
! l! It is also possible to coat the frame with a primer coat for the purpose of corrosion protection. Furthermore, in order to give the finished surface smoothness and excellent corrosion resistance, it is also useful to apply a water coating after a thick film coating such as powder coating.

The formwork to which C1 applies is applicable to all types of formwork currently in use, such as fully bent, wooden, and plastic.

Concrete of formwork coated by the method of the present invention - 1.
Bamboo prevention effect is second-! As seen in K, it is very good and can withstand repeated use many times.

Hereinafter, the present invention will be specifically explained with reference to Examples. Note that "parts" in the examples are expressed as "parts by weight."

Examples 1 to B The compositions shown in Examples 1 to 8 in Table 1 were applied to a 50 x 50 x 5 m mold made of a soft hard board with a dry film thickness of 20 μm.
The concrete formwork according to the present invention was prepared by spray painting it so that
It was used for a concrete pouring test.

Example 4 A 50x50x5α formwork made of a mild steel plate with a thickness of 5 tars was coated with epoxy resin thread powder paint ``Door Powder*to''.
oo White (manufactured by Toa Paint (1Ko) with a film thickness of 100 μm)
It was electrostatically coated so that Next, the composition shown in Example 2 was sprayed thereon so that the dry film thickness was 20μ'n, and the composition was sprayed at 120°.
C for 20 minutes to create a concrete form according to the present invention, which was used for a concrete pouring test.

Comparative Example 1 A 50x50x50 formwork made of a mild steel plate with a thickness of 5 mm,
Heavy oil was applied as a mold release agent and the concrete was subjected to a concrete pouring test.

Comparative Example 2 A commercially available emulsion-based W type agent was applied to a 50x50x5 country formwork made of a mild steel plate with a thickness of 5 am+ and subjected to a concrete pouring test.

Concrete prepared according to Examples 1 to 4 and Comparative Examples 1 to 2) 1!1! Concrete consisting of cement/sand/pebbles = 1/2/4 in terms of JFt ratio was poured into the frame, and after curing for 3 days, the concrete was removed from the mold and the condition was observed. Table 2 shows the results. The number of times the mold can be used repeatedly was determined by checking the number of times the mold can be used repeatedly.

Table 4B1 Coating composition PA used in Examples Hydroxyl group-containing fluoropolymer solution, Asahi Glass 1lt
lI! 1 heating residue 6o% OH value 62 viscosity If: 140 cps (heating residue 8o% 25℃
) *2 Average particle size 6 μm *8 W1 titanium oxide, Ishihara Sangyo 4N *4 HMDI polyvalent incyanate, Sumitomo C Yer Creta Sen W# Heating residue 76% NCO 16.5% Table 2 Test results *I ASTM - tested by DI894.

shi32 Kyowa Kagaku Shushin ml! The contact angle to water was measured using IcA-^ type.

*8 Identified according to JIS-5400.

*4 G-view (C refers to the flatness of the surface.

O... Extremely excellent flatness t11 property.

O...1,000m property is good.

*Judged by 50-degree observation: 0...Type I%IC Co//Reet substance is hardly attached.

O: Baton 1 (: Iy There is a lot of Cree-14 attached.

*6 The flatness of the bottom surface was determined by g-viewing.

O...=There is no r-shape on the concrete surface, and the flat m1'1 is changed.

0: Slight unevenness has occurred on the conocrete surface.

Δ...Oil stains occur on the concrete surface (coloring).

Patent applicant Azuma Paint Co., Ltd.

Claims (1)

[Claims] l In the production of concrete formwork, a composition containing a fluorine-containing polymer having a hydroxyl group in the molecule and a curing agent as essential components is used to form the contact area of the formwork with concrete. A method for producing concrete formwork, characterized by a method for producing concrete formwork. 2 In the production of concrete formwork, hydroxyl J is added to the molecule.
A fluorine-containing polymer, a curing agent, and (J 1
)) Using a composition containing a fluorine-containing polymer as an essential component, the parts of the formwork that come in contact with concrete (!-
A method for manufacturing concrete formwork, characterized by: