JPH0995555A - Thermosetting resin composition and reinforced resin pipe made by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermosetting resin composition which can give a lightweight cured material excellent in mechanical strength, chemical resistance, etc., and produce a reinforced resin pipe made by using the composition. SOLUTION: This resin composition contains 100 pts.wt. aggregate consisting of at most 70wt.% lightweight aerated concrete particles with a diameter of 0.5-3mm and at least 30wt.% glass fiber reinforced cured thermosetting resin powder, or 100 pts.wt. aggregate consisting of at least 40wt.% rock wool with a particle diameter of 0.5-2mm and at most 60wt.% glass fiber reinforced cured thermosetting resin powder, and 30-100 pts.wt. thermosetting resin. A reinforced resin pipe 1 is formed by providing a glass fiber reinforced cured thermosetting resin layer 3 on both inner and outer sides of a core layer 2 comprising a cured material of the above-mentioned thermosetting resin composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting resin composition suitable mainly for use as a core layer of a reinforced resin pipe, and a reinforced resin pipe produced using the thermosetting resin composition. About.

[0002]

2. Description of the Related Art Conventionally, a cured product of a thermosetting resin composition comprising a thermosetting resin such as an unsaturated polyester resin and an aggregate such as silica sand has advantages such as high strength and excellent chemical resistance. It is widely used in various civil engineering materials such as pipes, box culverts, troughs, pavement boards, basins, septic tanks, and various building materials such as artificial marble and building interior materials.

As a concrete example thereof, Japanese Patent Publication No. 59-11.
In Japanese Patent No. 77, a composite pipe is manufactured by using a molding material composed of an unsaturated polyester resin, an epoxy resin, a vinyl ester resin or the like as a binder and an inorganic filler such as sand, calcium carbonate or clay as an aggregate. A method has been proposed.

However, since the cured product of the conventional thermosetting resin composition has a high specific gravity (g / cm ³ ) of 2 to 2.5, it has a problem that the weight becomes large when used as a structural material. is there. On the other hand, in order to reduce the weight, for example, when using a lightweight aggregate or the like, there is a problem that mechanical strength such as compressive strength generally decreases, lightweight, high mechanical strength,
There is a strong demand for the practical application of a thermosetting resin composition capable of obtaining a cured product having various properties such as excellent chemical resistance.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is a thermosetting resin which is light in weight and can provide a cured product having excellent mechanical strength and chemical resistance. It is an object of the present invention to provide a composition and a reinforced resin pipe manufactured by using the thermosetting resin composition.

[0006]

The thermosetting resin composition according to the invention of claim 1 (hereinafter referred to as the "first invention") is a lightweight foamed concrete having a particle size in the range of 0.5 to 3 mm. An aggregate 10 comprising 70% by weight or less of particles and 30% by weight or more of a powder of a cured product of a glass fiber reinforced thermosetting resin.
It is characterized in that 30 to 100 parts by weight of the thermosetting resin is contained with respect to 0 parts by weight, whereby the above-mentioned object is achieved.

The thermosetting resin composition according to the second aspect of the invention (hereinafter referred to as the "second invention") has a particle size of 0.
40% by weight or more of rock wool in the range of 5 to 2 mm,
And, 30 to 100 parts by weight of the thermosetting resin is contained in 100 parts by weight of the aggregate composed of 60% by weight or less of the powdered product of the glass fiber reinforced thermosetting resin. The task is achieved.

Furthermore, in the reinforced resin pipe according to the invention of claim 3 (hereinafter referred to as "third invention"), the core material layer is made of a cured product of the thermosetting resin composition according to the first invention or the second invention. It is characterized in that a cured layer of a glass fiber reinforced thermosetting resin is provided on both inner and outer layers of the core material layer, whereby the above-mentioned object is achieved.

The aggregate used in the thermosetting resin composition according to the first invention is a lightweight expanded concrete particle (hereinafter referred to as "ALC particle") having a particle size in the range of 0.5 to 3 mm.
70% by weight or less, and 30% by weight of glass fiber reinforced thermosetting resin cured powder (hereinafter referred to as "FRP powder")
It is necessary to consist of the above.

The above-mentioned ALC particles can be obtained, for example, by crushing or crushing a lightweight foamed concrete molding or the like, sieving, and collecting ALC particles having a particle size in the range of 0.5 to 3 mm. I can.

If the particle size of the ALC particles is less than 0.5 mm or exceeds 3 mm, the mechanical strength of the cured product of the thermosetting resin composition obtained is lowered.

The FRP powder is not particularly limited, but, for example, cutting powder or polishing powder of a molded article of glass fiber reinforced thermosetting resin is preferably used.

The amount of ALC particles in the aggregate is 70.
FR in excess of weight% or in the above aggregate
If the amount of P powder is less than 30% by weight, the mechanical strength of the cured product of the thermosetting resin composition obtained is reduced.

The aggregate used in the thermosetting resin composition according to the second invention is 40% by weight or more of rock wool having a particle size of 0.5 to 2 mm and 60% by weight of FRP powder.
It must consist of:

The rock wool is prepared by adding auxiliary raw materials for component adjustment to a slag (slag) such as nickel ore, manganese ore, pig iron, etc., melted in a cupola furnace, electric furnace, etc., and centrifuged by a spinner or the like. It is made into a fine fibrous shape, and then it is processed into granules in the granulation step and then sieved to have a particle size of 0.5.
It can be obtained by collecting rock wool in the range of 2 mm.

If the particle size of the rock wool is less than 0.5 mm or more than 2 mm, the mechanical strength of the cured product of the thermosetting resin composition obtained is lowered.

The FRP powder is not particularly limited, but is the same as the case of the aggregate used in the thermosetting resin composition according to the first invention, for example, glass fiber reinforced thermosetting resin. Cutting powder, polishing powder, or the like of the molded body of 1 is preferably used.

The amount of rock wool in the aggregate is 4
If it is less than 0% by weight or the amount of the FRP powder in the aggregate exceeds 60% by weight, the mechanical strength of the cured product of the thermosetting resin composition obtained will decrease.

The type of thermosetting resin used as the matrix resin in the thermosetting resin composition according to the first and second aspects of the invention is not particularly limited, but it may be an unsaturated polyester resin, a vinyl ester resin, Epoxy resins, phenolic resins, furan resins, urethane resins, acrylic resins, spirane resins, etc. are mentioned, and one or more of these are preferably used. Among them, from the viewpoint of performance and cost balance, A saturated polyester resin is more preferably used.

It is needless to say that the thermosetting resin may contain a required amount of one or two or more corresponding curing agents and curing catalysts.

The thermosetting resin composition according to the first invention comprises 70% by weight of ALC particles having a particle size in the range of 0.5 to 3 mm.
The thermosetting resin 30 to 100 is added to 100 parts by weight of the aggregate composed of the following and 30% by weight or more of FRP powder.
It is necessary that parts by weight are contained.

The thermosetting resin composition according to the second aspect of the present invention comprises rock wool 4 having a particle size in the range of 0.5 to 2 mm.
The thermosetting resin 30 is added to 100 parts by weight of the aggregate composed of 0% by weight or more and 60% by weight or less of FRP powder.
.About.100 parts by weight must be contained.

In any of the first invention and the second invention, when the content of the thermosetting resin is less than 30 parts by weight relative to 100 parts by weight of the aggregate, a cured product of the thermosetting resin composition obtained is obtained. When the content of the thermosetting resin with respect to 100 parts by weight of the aggregate exceeds 100 parts by weight, the mechanical strength of the thermosetting resin composition decreases, and the viscosity of the thermosetting resin composition decreases, resulting in handling work. As the sex declines,
It also increases costs.

The thermosetting resin composition according to the first invention and the second invention may contain, in addition to the above-mentioned aggregate and thermosetting resin, glass fiber or the like, if necessary, within a range not impairing the object of the present invention. Reinforcing agent, air-blocking agent such as wax, filler, softening agent, plasticizer, dispersant, surfactant, defoaming agent, stabilizer, antioxidant, ultraviolet absorber, coloring agent, and other additives 1 One kind or two or more kinds may be contained.

The method for producing the thermosetting resin composition according to the first and second aspects of the invention is not special, and the prescribed amount of the above-mentioned aggregate and the prescribed amount of the thermosetting resin, and if necessary, A predetermined amount of one or more of the above-mentioned various additives to be contained according to the above is uniformly mixed with a mixer such as a cement mixer, a planetarium mixer, or a kneader at room temperature or under heating without any trouble. A desired thermosetting resin composition can be obtained by mixing.

In the reinforced resin pipe according to the third invention, the core material layer is composed of a cured product of the thermosetting resin composition according to the first invention or the second invention, and the glass fiber reinforced heat is applied on both inner and outer layers of the core material layer. It is necessary that a cured layer of a curable resin be provided.

FIG. 1 is a sectional view in the circumferential direction of a reinforced resin pipe according to the third invention.

As shown in FIG. 1, a reinforced resin pipe 1 according to a third aspect of the present invention includes a core material layer 2 made of a cured product of the thermosetting resin composition according to the first or second aspect of the invention, and the core material layer 2. Of the glass fiber reinforced thermosetting resin provided on both inner and outer layers. In the core material layer 2, ALC particles or rock wool 21 are randomly dispersed in the mixed layer 22 of the thermosetting resin composition and the FRP powder to form a sea-island structure.

Further, the hardened layer 3 of the glass fiber reinforced thermosetting resin provided on both inner and outer layers of the core material layer 2 has a function as a strengthened layer, and the mechanical strength of the obtained reinforced resin pipe 1 is increased. And chemical resistance are further improved.

The glass fiber reinforced thermosetting resin forming the above-mentioned hardened layer 3 is not special and a conventionally known glass fiber reinforced thermosetting resin is preferably used. The kind of the thermosetting resin is not particularly limited, but the same thermosetting resin as the above-mentioned various thermosetting resins used as the matrix resin in the thermosetting resin composition according to the first invention and the second invention. One or two or more of the organic resins are preferably used, and among them, the unsaturated polyester resin is more preferably used from the viewpoint of the balance between performance and cost.

The method for molding the reinforced resin pipe according to the third invention is not particularly limited, and examples thereof include a filament winding method, a lap molding method, a centrifugal molding method and the like, which are preferably adopted. Among them, the filament winding method is more preferably adopted.

The method of forming the reinforced resin pipe by the filament winding method is not particularly limited, but, for example, first, glass roving impregnated with a thermosetting resin or the like is applied to the surface of the core die with a constant tension. Wrapped around,
Then, a thermosetting resin composition according to the first invention or the second invention is applied thereon with a predetermined coating thickness, and a glass roving impregnated with the thermosetting resin or the like is further applied thereto under a constant tension. It is possible to obtain a desired reinforced resin pipe by winding it under a mold, heat-curing it at a predetermined temperature and for a certain period of time, and then performing die cutting.

(Function) The thermosetting resin composition according to the first aspect of the invention comprises 70% by weight or less of lightweight expanded concrete particles having a particle size in the range of 0.5 to 3 mm, and a glass fiber reinforced resin hardened powder 30. 30 to 100 parts by weight of thermosetting resin is contained with respect to 100 parts by weight of the aggregate made up of 1% by weight or more, so that the mechanical strength such as the compressive strength and the chemical resistance can be obtained even though it is lightweight. An excellent cured product can be easily obtained.

The thermosetting resin composition according to the second aspect of the present invention comprises rock wool 4 having a particle size in the range of 0.5 to 2 mm.
30 to 100 parts by weight of the thermosetting resin is contained in 100 parts by weight of the aggregate composed of 0% by weight or more and 60% by weight or less of the glass fiber reinforced resin powder, and therefore, it is lightweight. Nevertheless, it is possible to easily obtain a cured product having excellent mechanical strength such as compressive strength and chemical resistance.

Further, in the reinforced resin pipe according to the third invention, the core material layer is made of a cured product of the thermosetting resin composition according to the first invention or the second invention, and the reinforcement layer is formed on both inner and outer layers of the core material layer. Since it is provided with a hardened layer of glass fiber reinforced thermosetting resin, it is lightweight and exhibits more excellent mechanical strength such as compressive strength and chemical resistance.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION In order to explain the present invention in more detail, examples will be given below. In the examples, “parts” means “parts by weight”, and “%” means “% by weight”.

(Example 1)

( 1) Preparation of thermosetting resin composition and cured product
ALC particles 65 having a particle size in the range of 0.5 to 3 mm, obtained by crushing and sieving a lightweight foam concrete molding made of
%, And FRP powder 35% obtained by cutting a glass fiber reinforced unsaturated polyester resin molded body 1
A thermosetting resin composition was produced by uniformly stirring and mixing 00 parts and 70 parts of an unsaturated polyester resin containing 2% of a curing agent. Next, the obtained thermosetting resin composition was filled in a mold having a predetermined shape, heated and cured at 70 ° C. for 2 hours, then allowed to cool and removed from the mold to produce a cured product.

( 2) Evaluation The specific gravity and compressive strength of the cured product obtained above were evaluated by the following methods. The results were as shown in Table 1. The evaluation is 23 ° C.-65 unless otherwise specified.
It was performed under an atmosphere of% RH.

Specific gravity : The cured product was cut into a cubic sample for measurement having a width of 10 mm, a length of 10 mm and a height of 20 mm. Next, the weight of the measurement sample was measured and divided by volume to obtain a specific gravity. The measurement was performed at n = 10, and the average value was calculated to determine the specific gravity (g / cm ³ ).

Compressive strength : The cured product is cut into a width of 10 m
A cubic measurement sample having a length of m, a length of 10 mm, and a height of 20 mm was collected. Then, the compressive strength of the measurement sample was measured at a loading speed of 1 mm / min using a Tensilon tester. The measurement was performed at n = 5, and the average was calculated to determine the compressive strength (kg / cm ² ).

(Example 2)

In the preparation of the thermosetting resin composition, the composition of the aggregate is set to ALC whose particle size is in the range of 0.5 to 3 mm.
A thermosetting resin composition was produced in the same manner as in Example 1 except that 70% of particles and 30% of FRP powder were used.

(Comparative Example 1)

A thermosetting resin composition was prepared in the same manner as in Example 1 except that ALC particles having a particle size of less than 0.5 mm were used in the preparation of the thermosetting resin composition.

(Comparative Example 2)

A thermosetting resin composition was prepared in the same manner as in Example 1 except that ALC particles having a particle size of more than 3 mm were used in the preparation of the thermosetting resin composition.

(Comparative Example 3)

In the preparation of the thermosetting resin composition, the composition of the aggregate is set to ALC whose particle size is in the range of 0.5 to 3 mm.
A thermosetting resin composition was produced in the same manner as in Example 1 except that the particles were 75% and the FRP powder was 25%.

(Comparative Example 4)

In the preparation of the thermosetting resin composition, the composition of the aggregate is adjusted to ALC whose particle size is in the range of 0.5 to 3 mm.
A thermosetting resin composition was produced in the same manner as in Example 1 except that the particles were 80% and the FRP powder was 20%.

(Comparative Example 5)

In the preparation of the thermosetting resin composition, the composition of the aggregate is set to ALC whose particle size is in the range of 0.5 to 3 mm.
A thermosetting resin composition was produced in the same manner as in Example 1 except that 90% of particles and 10% of FRP powder were used.

(Comparative Example 6)

In the preparation of the thermosetting resin composition, the composition of the aggregate was changed to 100% ALC particles having a particle size of 0.5 to 3 mm without using FRP powder. A thermosetting resin composition was produced in the same manner as in 1.

(Comparative Example 7)

Silica sand No. 3 60%, silica sand No. 7 30%, and
100 parts of aggregate composed of 10% calcium carbonate and 11 parts of an unsaturated polyester resin containing 2% of a curing agent similar to those used in Example 1 were uniformly stirred and mixed to obtain a thermosetting resin composition. A product was made.

Using the eight types of thermosetting resin compositions obtained in Example 2 and Comparative Examples 1 to 7, eight types of cured products were prepared in the same manner as in Example 1.

The specific gravities of the eight types of cured products obtained above,
The results of evaluating the compressive strength in the same manner as in Example 1 are shown in Table 1.

(Example 3)

62% rockwool having a particle size in the range of 0.5 to 2 mm, and FR similar to that used in Example 1
A thermosetting resin composition was produced by uniformly stirring and mixing 100 parts of an aggregate composed of 38% P powder and 77 parts of the same unsaturated polyester resin as that used in Example 1.

(Examples 4 to 7)

In preparing the thermosetting resin composition, four kinds of thermosetting resin compositions were prepared in the same manner as in Example 3 except that the aggregate had the composition shown in Table 2.

(Comparative Example 8)

A thermosetting resin composition was produced in the same manner as in Example 3 except that rock wool having a particle size of less than 0.5 mm was used in the production of the thermosetting resin composition.

(Comparative Example 9)

A thermosetting resin composition was prepared in the same manner as in Example 3 except that rock wool having a particle size of more than 2 mm was used in the preparation of the thermosetting resin composition.

Seven types of cured products were prepared in the same manner as in Example 1 using the seven types of thermosetting resin compositions obtained in Examples 3 to 7 and Comparative Examples 8 to 9.

The specific gravities of the seven types of cured products obtained above,
The results of evaluating the compressive strength by the same method as in Example 1 are shown in Table 2.

[0070]

[Table 1]

[0071]

[Table 2]

As shown in Table 1, the cured products of the thermosetting resin compositions of Example 1 and Example 2 according to the first invention were:
Compared with the cured product of the thermosetting resin composition of Comparative Example 7 according to the prior art, the compressive strength is as high as about 1.6 to 1.1 times, although the specific gravity is about 55% and lightweight, which is excellent. Exhibits mechanical strength.

On the other hand, an AL having a particle size of less than 0.5 mm
Comparative Example 1 using C particles, ALC with a particle size exceeding 3 mm
Thermosetting resin compositions of Comparative Example 2 using particles, and Comparative Examples 3 to 6 using aggregates in which the content of ALC particles having a particle size in the range of 0.5 to 3 mm exceeds 70% by weight. All of the cured products have a low specific gravity but a low compressive strength.

Further, as shown in Table 2, the cured products of the thermosetting resin compositions of Examples 3 to 7 according to the second invention were the thermosetting resin compositions of Comparative Example 7 (Table 1) according to the prior art. Compared to the cured product, the specific gravity is about 53 to 66%, which is light, but the compression strength is about 2.1 to 1.2 times higher, and excellent mechanical strength is exhibited.

On the other hand, a cured product of the thermosetting resin composition of Comparative Example 8 using rock wool having a particle size of less than 0.5 mm and Comparative Example 9 using rock wool having a particle size of more than 2 mm. In each case, the specific gravity is light, but the compressive strength is low.

[0076]

As described above, the thermosetting resin composition according to the first invention and the second invention can easily obtain a cured product which is lightweight and has excellent mechanical strength such as compressive strength and chemical resistance. Therefore, it is preferably used mainly as a core material layer of a reinforced resin pipe.

In the reinforced resin pipe according to the third invention, the cured product of the thermosetting resin composition according to the first or second invention is used as a core material layer, and a glass fiber reinforced heat treatment is performed on both inner and outer layers as a reinforcing layer. Since the cured layer of the curable resin is provided, it is light in weight and exhibits more excellent mechanical strength such as compressive strength and chemical resistance.

[0078]

[Brief description of drawings]

FIG. 1 is a circumferential sectional view of a reinforced resin pipe according to a third invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reinforced resin pipe 2 Core layer consisting of a cured product of the thermosetting resin composition according to the first invention or the second invention 21 Lightweight expanded concrete particles or rock wool 22 Mixed layer of thermosetting resin and FRP powder 3 Glass fiber reinforced Hardened layer of thermosetting resin

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Claims (3)

[Claims] 1. An aggregate of 100 parts by weight, which comprises 70% by weight or less of lightweight expanded concrete particles having a particle size in the range of 0.5 to 3 mm and 30% by weight or more of a glass fiber reinforced thermosetting resin hardened powder. On the other hand, thermosetting resin 30 to 100
A thermosetting resin composition, wherein the thermosetting resin composition contains a part by weight. 2. An aggregate 100 comprising 40% by weight or more of rock wool having a particle size of 0.5 to 2 mm and 60% by weight or less of a glass fiber reinforced thermosetting resin cured powder.
30-100 weight part of thermosetting resin is contained with respect to weight part, The thermosetting resin composition characterized by the above-mentioned. 3. A core material layer is made of a cured product of the thermosetting resin composition according to claim 1 or 2, and a cured layer of glass fiber reinforced thermosetting resin is provided on both inner and outer layers of the core material layer. A reinforced resin pipe characterized by being provided with.