JPS5827438B2 - Dannetsu pipe support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method for easily manufacturing an insulated pipe support with high pressure resistance, especially an insulated pipe support for cold storage, and more specifically relates to a method for easily manufacturing an insulated pipe support with high pressure resistance, and more specifically, it relates to a method for easily manufacturing an insulated pipe support with high pressure resistance, and more specifically, it relates to a method for easily manufacturing an insulated pipe support with high pressure resistance, and more specifically, it relates to a method for easily producing an insulated pipe support with high pressure resistance, and more specifically, it relates to a method for easily manufacturing an insulated pipe support with high pressure resistance, and more specifically, it relates to a method of manufacturing an insulated pipe support with high pressure resistance, particularly an insulated pipe support for cold storage. It consists of a spreading agent made of a plasticizer and an inorganic foam, and has an apparent specific gravity of 0.2 to 0.8.
The present invention relates to a method for producing a molded insulating pipe support product made of hard foam of El/cm3.

Insulated pipe support is an insulating material that requires high pressure resistance and is used in the part where insulated pipes are supported.
Conventionally, wood-based materials, other materials such as rigid polyurethane foam and expanded polystyrene have been used, but all of them have the following drawbacks.

That is, in the case of wood, it is a natural material, and of course the quality of the product is not constant depending on the type of wood, the condition of the raw wood, etc., and processing and molding requires skill, and processing losses are extremely large.

Rigid polyurethane foam is also an excellent material, but it generally has a 10 to 5 oKy
In order to make something with a compressive strength of up to 7 crtt, its specific gravity must be 0.1 g/cIl13 or more, and when making a pipe support with such a high specific gravity that exceeds several □□□, the reaction time Because the heat generated is extremely large, so-called "staining" occurs inside the product, making it difficult to manufacture.

Furthermore, since the so-called foaming pressure generated during foaming is large, there is a drawback that an extremely strong mold is required in order to produce molded products.

Also, in the case of expanded polystyrene, the specific gravity is o, 1g7crr.
In order to make products with high pressure resistance of L3 or higher, a similarly strong mold is required, and the same is true for rigid polyurethane foam, but if you want to make a pipe support by processing it from a so-called slab (board), it will be difficult to make it. Processing costs and processing losses are significantly large.

Moreover, as a generally useful insulated pipe support for cold storage, the compressive strength is 10K27m2 or more, preferably 20K27m2 or more.
Kp/cri2 or more, thermal conductivity 0.1 Kcal
/mh°C (at 23°C) or less, and the water absorption rate is required to be 2φ (volume %) or less.

However, in the case of the conventional method described above, it is difficult to obtain a heat insulating pipe support having such characteristics.

The present invention focuses on these shortcomings and aims to provide a method for producing a useful insulating pipe support while taking advantage of polyurethane's excellent physical properties and workability. A compatible petroleum-based hydrocarbon or plasticizer and an inorganic substance for forming bubbles are added in the required proportions, and the mixture is injected into a mold in the shape of a pipe support and allowed to solidify, thereby producing an improved heat-insulating pipe support. This is a characteristic feature.

In the method of the present invention, by adding the required amount of spreading agent to the polyurethane component as described above, the viscosity of the polyurethane component is significantly reduced, making it easier to add the inorganic foam.

In addition, unlike general rigid polyurethane foam, the method of the present invention basically controls the specific gravity of the product by the amount of inorganic foam (of course, the general urethane foam and general urethane foam are used as an auxiliary method). (Similarly, it is possible to use foaming materials such as water or freon), the foaming pressure during injection into the mold is significantly lower than in the case of hard urethane foam, and a simple mold is sufficient to provide pipe support. In addition, the inclusion of a spreading agent and inorganic foam significantly reduces the overall reaction heat, and the thickness is 10 cm.
Even when making a part of 6 parts with rrL, length 50 (:TL, inner diameter 60CTL), internal "scorching" as seen in rigid polyurethane foam does not occur.

The polyurethane component used in the method of the present invention is generally used for polyurethane, and the polyol is a polyfunctional polyether or polyester, and the incyanate is toluene diisocyanate, diphenylmethane diisocyanate, polymethylene phenyl diisocyanate, or these. A prepolymer having terminal incyanate groups obtained from a polyisocyanate and the above-mentioned polyol, an amine compound or an organometallic compound as a catalyst, and, if necessary, a silicon compound or the like as a foam stabilizer, are used.

Among the spreading agents used in the method of the present invention, the oily hydrocarbon is a petroleum-based oil that is compatible with the polyurethane component, has a high boiling point that does not have a boiling point at normal pressure, and has an aromatic content of 30% or more. hydrocarbon oils, such as Sonic Process Oil
-50, or X-100 (trade name, manufactured by Kyodo Oil Co., Ltd.), Vegaroid 501 (trade name, manufactured by Toa Fuel Co., Ltd.), and the like.

It is presumed that this type of spreading agent may not only serve as a spreading agent, but may also be involved in the reaction during solidification of the resin.

This spreading agent is usually mixed in a proportion of 10 to 60 parts per 100 parts by weight of the polyurethane component.

In addition, as plasticizers that are compatible with polyurethane components,
For example, DBP (dibutyl phthalate), BBP (butyl benzyl phthalate), DOA (dioctyl adipate), TCEP (tricresyl ethyl phosphate), etc. can be mixed as appropriate.

Furthermore, the inorganic foams used in the method of the present invention include various pearlite, glass microballoons, shirasu balloons, and the like.

Particularly low-cost perlite is the most useful, and these usually contain 10 to 180 parts by weight per 100 parts by weight of the polyurethane component.
Part by weight is mixed.

Thus, by using the spreading agent at a ratio of 10 to 60 parts by weight with respect to 100 parts by weight of the polyurethane component, it becomes easy to add 10 to 180 parts by weight of the inorganic foam, and the effect of the inorganic foam can be enhanced. It can be doubled.

On the other hand, when no spreading agent is used, it is difficult to add 20 parts by weight of inorganic foam due to the increase in viscosity, and it is not possible to obtain a thin tube molded product.

Hereinafter, specific embodiments of the present invention will be further described in detail with reference to Examples.

However, it goes without saying that the present invention is not limited thereto.

Note that the parts used in the examples are parts by weight.

Example control (N, N, N', N'tetrabis2(hydrobovdipropyl)ethylenediamine) (O
H value 760 ■KOI (/, F) 50 parts, glycerin propylene oxide adduct (OHHI367mgK'
OH/,! i') and 150 parts of process oil system) and thoroughly stirred and mixed.

This mixture was further added with polymethylene phenyl isocyanate-1.
-44, V-20 (Product name: Manufactured by Sumitomo Bayer Urethane)
135 parts were added and mixed.

Incidentally, when mixing, a small amount of water is added for those having an apparent specific gravity of 02 or less.

Next, each of these mixtures was placed in an aluminum mold with a thickness of 5 mm, and the shape was as shown in Figure 1, with a thickness of 5C7n and a length of 5mm.
A molded product having a length of 0 m, an inner diameter of 50 CnL, and a part of 6 parts was cast and cured to produce pipe support samples 1 to A7 (&7 is a comparison sample) shown in Table 1.

In this case, if a conventional material without pearlite was used, the mold would be damaged due to the foaming pressure, making it impossible to create a pipe support.

Also, when I thought about making a pipe support, I found that especially hard polyurethane foam with a specific gravity of 0.2 g/CTL3
When trying to make a mold using aluminum, a mold of 5 mm or more was sufficient for the method of the present invention as described above, whereas a mold of 30 mm or more was required.

In addition, upon casting, the inner surface of the mold was subjected to necessary mold release treatment in advance, and each of the above mixtures was stirred uniformly for 30 seconds to 1 minute, and then poured into the mold.

In addition, the curing in the sample preparation was completed in 10 to 15 minutes, and the mold could be released.

When we observed the physical properties of this hardened sample, the first
It was as shown in the table.

From Table 1 above, it can be seen that the formulation using the mixture of the polyurethane component (polyurethane, polyol, and process oil) and inorganic foam according to the method of the present invention not only simplifies the manufacturing process, but also reduces the collapse. It can be seen that it has suitable performance as an insulated pipe support for cold storage.

Furthermore, despite the relatively high specific gravity, there was little heat generation during the reaction, and production was extremely good.

On the other hand, comparative sample 7, which does not use pearlite, has excessive compressive strength, but naturally has insufficient thermal conductivity.

Thus, it is confirmed that the method of the present invention is effective in producing a heat-insulating no-life σ boat for cold storage.

[Brief explanation of the drawing]

1 and 2 are partial perspective views of an insulated pipe support obtained by the method of the present invention.

Claims (1)

[Claims] 1. For 100 parts by weight of polyurethane and the polyurethane component, 10 to 60 parts by weight of a spreading agent consisting of an oily hydrocarbon or plasticizer that is compatible with polyurethane and 10 to 1.80 parts by weight for 100 parts by weight of the polyurethane component.
An insulated pipe characterized by being formed by mold casting using a hard foam having an apparent specific gravity of 0.2 to 0.89/crrL3 as a molding material, which is a mixed composition with part by weight of an inorganic foam. How the support is manufactured.