JPH073955A - Building material - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a building material that can be safely incinerated without generating harmful substances, has good UV resistance, has little yellowing and strength deterioration, and has high surface slipperiness and impact resistance. [Structure] A building material made of polypropylene resin, in which either one or both of an ultraviolet absorber and a light stabilizer are contained in the polypropylene resin to improve ultraviolet resistance. Further, reinforcing fibers are embedded to improve the strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building material made of polypropylene resin and having good ultraviolet resistance.

[0002]

2. Description of the Related Art Conventionally, polyvinyl chloride resin plates, polycarbonate resin plates and the like have been used as roofing materials for terraces and garages and other exterior building materials.

Although these resin plates have good strength and heat resistance, they have the following problems.

[0004]

That is, the above-mentioned resin plate has a problem that it is difficult to safely incinerate it as waste from the viewpoint of protecting the global environment, and since it has poor ultraviolet resistance,
When used as a building material for exteriors, there is a problem that it is likely to deteriorate in a short period of time.

Further, since the above resin plate has poor surface smoothness, there is a problem that it is difficult to remove snow when it is used as a roofing material in a snowy area. There was a problem that it was easily cracked by impact force.

[0006]

In order to solve the above problems, the first invention is a building material made of polypropylene resin, wherein the polypropylene resin contains one or both of an ultraviolet absorber and a light stabilizer. The gist of the invention is that the second aspect of the present invention further embeds reinforcing fibers.

[0007]

In the building materials of the first and second inventions, the ultraviolet absorber contained in the polypropylene resin absorbs ultraviolet rays, and the light stabilizer traps radicals generated at the time of deterioration. Good property. Therefore, even if it is used as a building material for exteriors, it hardly causes strength deterioration or yellowing due to ultraviolet rays.

Further, since these building materials are made of polypropylene resin, they can be safely incinerated without generating harmful substances when they are incinerated as waste. Moreover, since this polypropylene resin has a large surface slipperiness and is not easily weakened even at low temperatures, using these building materials as roofing materials in snowy areas, for example, makes it easier to remove snow and reduces the weight of snow and external forces. There is no worry of breaking easily with the impact force. In particular, when reinforcing fibers are embedded as in the building material of the second invention, the rigidity and impact strength are increased and the risk of breakage is extremely reduced, and the shape retention during molding and shaping is also improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the first invention, showing a building material 1 obtained by melt-extruding a polypropylene resin into a flat plate shape. The shape of the building material 1 can be various shapes such as a corrugated plate shape, a sheet shape, a columnar shape, and an irregular shape other than the flat plate shape as in the embodiment. In this case, a flat plate extruded product may be formed into a wavy shape with a corrugating roll.

In the polypropylene resin of this building material 1,
Either or both of the ultraviolet absorber and the light stabilizer are contained. Therefore, even when the building material 1 is exposed to sunlight, ultraviolet rays are absorbed by the ultraviolet absorber, and radicals generated at the time of deterioration are captured by the light stabilizer, so that strength deterioration and yellowing due to ultraviolet rays do not occur. Few.

The ultraviolet absorber or light stabilizer contained in the polypropylene resin may be a non-reactive type or a reactive type. Examples of the non-reactive ultraviolet absorber include 2-
(2'-hydroxy-3'-t-butyl-5'-methylphenyl-5-chlorobenzotriazole, methyl-3
-[3-t-butyl-5- (2-benzotriazole-
2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol, 2- (2'-hydroxy-
3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2-hydroxy-4-n-octoxybenzophenone and the like are used, and as a reactive ultraviolet absorber, an unsaturated bond is contained in the molecule. A benzophenone-based or benzotriazole-based UV absorber having at least one of, for example, 2-hydroxy-4- (2'-methacryloyloxyethoxy) benzophenone, 2-hydroxy-4-
(2'-acryloyloxyethoxy) benzophenone, 2- (2'-hydroxy-3'-allyl-5'-t
-Butylphenyl) benzotriazole, 2- (2'-
Hydroxy-3'-allyl-5'-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-
3'-isopropenyl-5'-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-isopropenyl-5'-t-octylphenyl) benzotriazole, 2- (2'-acryloyloxy) -5'-
Methyl) benzotriazole or the like is used.

Examples of non-reactive type light stabilizers include 4-4'-thiobis- (2-methyl-6-t-butylphenol) and tetrakis (1,2,2,6,6-pentamethyl-4-). Piperidyl) 1,2,3,4 butane tetracarboxylate, 1,3,5-trimethyl-2,4
6-Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene or the like is used, and examples of the reactive light stabilizer include 1,2,2,6,6-pentamethyl-4-
Piperidyl methacrylate, 1,2,2,6,6-pentamethyl-4-piperidyl acrylate, 2,2,6
6-tetramethyl-4-piperidyl methacrylate,
2,2,6,6-tetramethyl-4-piperidyl acrylate or the like is used.

When a building material 1 made of polypropylene resin containing a non-reactive ultraviolet absorber or light stabilizer is produced, for example, polypropylene resin pellets dry-blended with the ultraviolet absorber or light stabilizer are extruded. In the molding machine, melt and knead while heating above the melting point of the polypropylene resin (however below the thermal decomposition temperature) inside the molding machine,
It may be extrusion-molded into a plate shape from the extrusion port at the tip of the molding machine. In the building material 1 thus obtained, the ultraviolet absorber and the light stabilizer are contained in the polypropylene resin in a uniformly dispersed state, and the ultraviolet absorber and the like do not react with the polymer molecules of the polypropylene resin. Since these ultraviolet absorbers and light stabilizers are likely to volatilize, if they are contained in a large amount, the ultraviolet absorbers and the like may migrate to the surface of the building material 1 and precipitate to deteriorate the appearance. However, if the content is too small, it becomes difficult to sufficiently improve the ultraviolet resistance.
Therefore, the content of the ultraviolet absorber or the light stabilizer is 0.0 or more in the polypropylene resin alone or in total.
1 to 5% by weight, preferably about 0.05 to 3% by weight.

Further, as a method of maintaining the ultraviolet resistance, when a building material 1 made of polypropylene resin containing a reactive ultraviolet absorber or a light stabilizer is produced, the reactive ultraviolet absorber is added to pellets of polypropylene resin. And a light stabilizer and a radical reaction initiator are dry blended, and this is put into an extrusion molding machine and melt-kneaded while being heated above the melting point of the polypropylene resin (but below the thermal decomposition temperature) inside the molding machine. It may be extruded into a plate shape from the extruding port at the tip. By doing so, the reactive UV absorber or light stabilizer undergoes a radical reaction with the polymer molecule of the polypropylene resin during melt-kneading inside the molding machine, and the UV absorber or the like bonds and fixes to the polymer molecule as a side chain. Will be
It is possible to exert the effect for a long period of time without the ultraviolet absorber and the like being volatilized. Therefore, in this case, the content of the reactive ultraviolet absorber or the light stabilizer is 0.01 to 10% by weight, preferably about 0.05 to 5% by weight, individually or in total with respect to the polypropylene resin. Good to do. In this way, a building material 1 containing a reactive ultraviolet absorber or light stabilizer
Even if the content of the ultraviolet absorber or the like is the same, since the content does not decrease due to precipitation or volatilization, excellent ultraviolet resistance can be exhibited for a long period of time. As the radical reaction initiator, benzoyl peroxide, azo-bis-isobutyronitrile, t-butyl hydroperoxide,
2,5-Dimethyl-2,5-di (t-butylperoxy) hexane, octanoyl peroxide and the like are used.

In each of the above production methods, a polypropylene resin containing a non-reactive or reactive ultraviolet absorber or light stabilizer is extruded in a single layer. For example, a coextrusion machine is used. A polypropylene resin containing the ultraviolet absorber or the like is used as an upper layer, and a polypropylene resin containing less or no ultraviolet absorber than the upper layer is coextruded as an intermediate layer or a lower layer to form an ultraviolet absorber on the surface. It is also possible to produce a polypropylene resin building material having a two-layer or three-layer structure having a polypropylene resin layer having a good ultraviolet resistance including the above. Such a multi-layer building material is also included in the present invention.

FIG. 2 is a sectional view showing an embodiment of the second invention, in which a reinforcing fiber 2 is provided inside a building material 1 made of polypropylene resin containing one or both of the above-mentioned ultraviolet absorber and light stabilizer. Is embedded. As the reinforcing fiber 2, a net such as a glass fiber, a carbon fiber, an organic fiber, a mat or a short fiber is preferably used. By embedding the reinforcing fiber 2 in this way, the rigidity and impact strength of the building material 1 are improved, so that the building material 1 is less prone to cracking, and the shape retention during molding and shaping is also improved.

In the case of manufacturing the building material 1 containing such reinforcing fibers, for example, as shown in FIG. 3, the reinforcing fibers 2 are continuously supplied from the supply rolls 3 and the extruders 4 on both sides are provided.
Polypropylene resins 1a, 1a containing an ultraviolet absorber and a light stabilizer may be continuously extruded from No. 4, and they may be fused and integrated by being pinched from both sides by a pair of rolls 5, 5.

In this embodiment, the reinforcing fiber 2 is embedded in a single layer in the middle portion in the thickness direction of the building material 1 made of polypropylene resin, but the reinforcing fiber 2 may be embedded in a multi-layer. Also, short glass fiber or the like is used as the reinforcing fiber 2,
It may be uniformly embedded in the entire interior of the building material 1.

Next, concrete examples and comparative examples will be described. (Example 1)

With respect to 100 parts by weight of polypropylene resin,
1-Hydroxy-4-n-as a non-reactive ultraviolet absorber
1.5 parts by weight of octoxybenzophenone was added and dry blended. The mixture was put into an extruder, melt-kneaded at 230 ° C., and extruded from an extrusion port at the tip of the molding machine to produce a thin plate-shaped building material. Then, this building material is cut and the test piece (5
0 × 100 × 1 mm) was prepared.

An accelerated weathering test was conducted on this test piece to examine the relationship between the irradiation time, the degree of yellowing (ΔYI), and the residual rate of the ultraviolet absorber. The results are shown in Table 1.

The accelerated weather resistance test was performed using a xenon weatherometer (manufactured by Atlas Co.) for 100 hours and 500 hours.
Acceleration test by irradiation for r and 1000 hours was performed, and ΔYI was obtained by measuring with a Σ90 color measuring system (manufactured by Nippon Denshoku Co., Ltd.). In addition, the residual rate was measured by measuring the UV absorbance of the test piece at each irradiation time using a visible ultraviolet spectrophotometer UV-3100 (manufactured by Shimadzu Corporation), and measuring the absorbance at the maximum absorption wavelength of each UV absorber. The change is a value calculated with the residual rate when the irradiation time is 0 hr as 100. (Example 2)

With respect to 100 parts by weight of polypropylene resin,
As a non-reactive light stabilizer, 1.0 part by weight of 4-4'-thiobis- (2-methyl-6-t-butylphenol) was added and dry blended. A thin plate-shaped building material is manufactured into a test piece (50 x 10
0 × 1 mm) was prepared. About this test piece Example 1
The accelerated weather resistance test was conducted in the same manner as above, and the irradiation time and yellowing degree (Δ
The results of examining the relationship with YI) are shown in Table 1. (Example 3)

With respect to 100 parts by weight of polypropylene resin,
2- (2'-hydroxy-) as a non-reactive ultraviolet absorber
1.5 parts by weight of 3,5'-di-t-butylphenyl) -5-chlorobenzotriazole and 4-4'-thiobis- (2-methyl-6-t-butylphenol) as a non-reactive light stabilizer 1.0 part by weight was added and dry blended, and this was put into an extrusion molding machine to manufacture a thin plate-like building material in the same manner as in Example 1 to prepare a test piece (50 × 100 × 1 mm). An accelerated weather resistance test was conducted on this test piece in the same manner as in Example 1, and the results of examining the relationship between the irradiation time, the degree of yellowing (ΔYI), and the residual rate of the ultraviolet absorber are shown in Table 1. (Example 4)

With respect to 100 parts by weight of polypropylene resin,
2-hydroxy-4- (2 ') as a reactive ultraviolet absorber
1.5 parts by weight of methacryloyloxyethoxy) benzophenone and 1.0 part by weight of bunzoyl peroxide as a radical reaction initiator were added and dry blended. This blended product was put into an extrusion molding machine, heated to 230 ° C., reacted for 5 minutes while being melt-kneaded, and extruded from an extrusion port at the tip of the molding machine to produce a thin plate-shaped building material. Then, this building material was cut to prepare a test piece (50 × 100 × 1 mm). An accelerated weather resistance test was conducted on this test piece in the same manner as in Example 1, and the results of examining the relationship between the irradiation time, the degree of yellowing (ΔYI), and the residual rate of the ultraviolet absorber are shown in Table 1. (Example 5)

With respect to 100 parts by weight of polypropylene resin,
2.0 parts by weight of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate as a reactive light stabilizer,
1.0 part by weight of benzoyl peroxide was added as a radical reaction initiator, dry blended, and charged into an extrusion molding machine to produce a thin plate-like building material in the same manner as in Example 4, and a test piece (50 x 100 x 1 mm) was created. An accelerated weather resistance test was conducted on this test piece in the same manner as in Example 1, and the results of examining the relationship between the irradiation time and the degree of yellowing (ΔYI) are shown in Table 1. (Example 6)

With respect to 100 parts by weight of polypropylene resin,
2-hydroxy-4- (2 ') as a reactive ultraviolet absorber
-Acryloyloxyethoxy) benzophenone
5 parts by weight and 1,2,2,6,6 as a reactive light stabilizer
-Pentamethyl-4-piperidyl acrylate 1.0
1.0 part by weight of benzoyl peroxide as a radical reaction initiator was added, and the mixture was placed in an extrusion molding machine to produce a thin building material in the same manner as in Example 4. (50 × 100 × 1 mm) Y was prepared. An accelerated weather resistance test was conducted on this test piece in the same manner as in Example 1, and the results of examining the relationship between the irradiation time, the degree of yellowing (ΔYI), and the residual rate of the ultraviolet absorber are shown in Table 1. (Comparative Example 1)

A polypropylene resin is extruded to produce a thin plate-shaped building material, which is cut into test pieces (50 × 100).
× 1 mm) was produced. An accelerated weather resistance test was conducted on this test piece in the same manner as in Example 1, and the irradiation time and the yellowing degree (ΔY
The results of examining the relationship with I) are shown in Table 1.

[0030]

[Table 1]

From Table 1, it can be seen that the polypropylene resin building materials of Examples 1 to 6 are 100% higher than the polypropylene resin building material containing no ultraviolet absorber (Comparative Example 1).
It can be seen that the yellowing degree (ΔYI) after irradiation of ultraviolet rays for 0 hours is small and excellent ultraviolet resistance is exhibited. In particular, Example 4
The polypropylene resin building materials Nos. 6 to 6 contain most of the UV absorbers contained therein in a state where they are fixed by being bonded to polymer molecules, so the degree of yellowing during long-term irradiation is extremely small, and The residual rate of the absorbent is large,
It can be seen that extremely excellent resistance to ultraviolet rays is maintained. (Examples 7 to 12)

The dry blends of Examples 1 to 6 were respectively put into the left and right extruders, melt-kneaded at 230 ° and extruded from the extruding port at the tip into a sheet of 0.5 mm, while the glass fiber was added therebetween. Net (fiber thickness: 0.15
mm, mesh size: 4 × 4 mm) and pressure-bonded and integrated with a pair of rollers to manufacture 6 types of building materials in which a glass fiber net was embedded in the middle. Then, each building material is cut to produce 6 kinds of test pieces (50 × 100 × 1 mm),
An accelerated weathering test was conducted in the same manner as in Example 1 to examine the relationship between the irradiation time, the degree of yellowing (ΔYI), and the residual rate of the ultraviolet absorber, and the results were substantially the same as those of the test pieces of Examples 1 to 6. was gotten.

Further, the test pieces of Examples 7 to 12 and the test piece of Comparative Example 1 were subjected to an impact resistance test in accordance with JIS A5702. As a result, all the test pieces of Examples 7 to 12 had a rigid ball of 1 kg. It had an impact resistance of 1800 mm or more and was far superior to the test piece of Comparative Example 1.

[0034]

As is apparent from the above description, the building material of the present invention containing an ultraviolet absorber and a light stabilizer in a polypropylene resin has good ultraviolet resistance, and even if it is used as an exterior building material, yellowing or The effect of less deterioration in strength is exhibited, and particularly those containing a reactive ultraviolet absorber or light stabilizer can maintain excellent ultraviolet resistance for a long period of time. Moreover, since the building material of the present invention is made of polypropylene resin, it can be safely incinerated without generating harmful substances when it is incinerated as waste, and the polypropylene resin has large surface lubricity and becomes brittle even at low temperatures. Since it is a difficult resin, when the building material of the present invention is used, for example, as a roof material in a snowy area, it is easy to remove snow, and there is no fear of being easily cracked by the weight of snow or impact force from the outside. In particular, building materials with embedded reinforcing fibers have extremely low risk of breakage because their rigidity and impact strength are improved,
Good shape retention during molding and shaping.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a building material of the first invention.

FIG. 2 is a sectional view showing an embodiment of a building material of the second invention.

FIG. 3 is an explanatory diagram showing an example of a manufacturing method of the building material of the embodiment.

[Explanation of symbols]

1 Flat building material made of polypropylene resin obtained by reacting one or both of an ultraviolet absorber and a light stabilizer 2 Reinforcing fiber

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takaaki Kato 2-3-3 Azuchi-cho, Chuo-ku, Osaka Takiron Co., Ltd.

Claims (2)

[Claims] 1. A building material comprising a polypropylene resin, wherein the polypropylene resin contains one or both of an ultraviolet absorber and a light stabilizer. 2. A building material comprising a polypropylene resin, wherein the polypropylene resin contains one or both of an ultraviolet absorber and a light stabilizer, and a reinforcing fiber is embedded therein.