JPWO2018025951A1 - Resin molded body - Google Patents

Abstract

Provided is a resin molded body in which a nail is easy to hit and the nail is not easily pulled out even in an environment where the nail is likely to become hot or cold.
The resin molded body contains a thermoplastic resin and inorganic particles, has a porosity of 5 to 80%, and the content of inorganic particles is 40% by mass or more based on the total mass of the resin molded body. The inorganic particles preferably include calcium carbonate particles. The thermoplastic resin preferably includes polypropylene. Moreover, it is preferable that the resin molding is for nailing.

Description

  The present invention relates to a resin molded body.

  Conventionally, a molded body of a thermoplastic resin has been used as a member such as a floor or a pillar.

  In Patent Document 1, in a floor building material formed by laminating a thermoplastic resin molded body on a wooden base material, 15 to 60% by weight of paper powder and 0 to 10% by weight of color pigment are added to the resin molded body of the thermoplastic resin. The building material for floors characterized by mix | blending is described. Patent Document 1 describes that stable color quality can be ensured by blending paper powder such as pulp.

JP2015-203189A

  A member such as a floor needs to hit a nail when assembling, but the floor member described in Patent Document 1 has a problem that the nail is difficult to pass when the nail is hit.

  On the other hand, when a thermoplastic resin molded body is installed in an environment that tends to be higher or lower than room temperature, such as outdoors, using a thermoplastic resin molded body as in Patent Document 1, the nail that has been struck can be obtained. There was a problem that it was easy to come off.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin molded body in which a nail is easy to hit and does not easily come off even when installed in an environment where it is likely to be hot or cold.

  The present inventors blended a large amount of inorganic particles into a thermoplastic resin and then molded a resin having a predetermined porosity, so that nails can be easily struck and installed in an environment that tends to be hot or cold. As a result, it was found that the nails were difficult to come off, and the present invention was completed. More specifically, the present invention aims to provide the following.

(1) A resin molded body,
A thermoplastic resin and inorganic particles,
The porosity is 5 to 80%,
The resin molding which content of the said inorganic particle is 40 mass% or more with respect to the mass of the whole resin molding.

  (2) The resin molded product according to (1), wherein the inorganic particles include calcium carbonate particles.

  (3) The resin molded product according to (1) or (2), wherein the thermoplastic resin contains polypropylene.

  (4) The resin molded product according to any one of (1) to (3), which is for nailing.

  (5) The resin molded body according to any one of (1) to (4), which is installed outdoors.

  (6) A resin product obtained by nailing the resin molded body according to any one of (1) to (5).

  (7) A method for producing a resin product, comprising a step of hitting a nail on the resin molded body according to any one of (1) to (5).

  According to the present invention, a nail can be easily struck, and even if the nail is installed in an environment where the temperature is likely to be high or low, the nail can be made difficult to come off.

  Hereinafter, although embodiment of this invention is described, this invention is not specifically limited to this.

<Resin molding>
The resin molded body of the present invention includes a thermoplastic resin and inorganic particles, has a porosity of 5 to 80%, and the content of inorganic particles is 40% by mass or more based on the total mass of the resin molded body. .

  The resin molded body of the present invention makes it easy to hit the nail, and further makes it difficult for the nail to come off even when installed in an environment that tends to be hot or cold, such as outdoors. The reason is presumed to be as follows.

  If the porosity of the resin is low, there will be no escape space for the volume of the nail when the nail is struck, it will be difficult for the nail to pass, so it will be difficult to hit the nail and will break if you try to force it There is a fear. In particular, when a large amount of inorganic particles are contained, the inorganic particles themselves are hard, so that when the nail is driven, the nail hits the inorganic particle, and the nail becomes more difficult to hit. On the other hand, the resin molded body of the present invention contains inorganic particles but has a certain porosity or more, and a moderate cavity is generated around the inorganic particles. At this time, since the inorganic particles are pushed into the hollow portion, the nail is easily driven. On the other hand, when it is installed in an environment that tends to be hot or cold, such as outdoors, it is exposed to this environment for a long period of time, so that the thermoplastic resin is deformed by a heat change and the nail is easily pulled out. On the other hand, according to the resin molded body of the present invention, a large amount of inorganic particles are contained, and the inorganic particles are not deformed by heat, so that they are relatively deformed from those not containing inorganic particles or having a small content of inorganic particles. As a result, it is presumed that the nail will not easily come off even when exposed to an environment that tends to be hot or cold such as outdoors for a long period of time. In addition, natural wood and resins deteriorate when used outdoors for a long time due to temperature, humidity, ultraviolet rays, etc., but since the present invention contains a large amount of inorganic particles, the deterioration of the resin over time is suppressed. It is done. Thus, the reinforcing effect by the inorganic particles is expected as compared with the resin alone.

(Thermoplastic resin)
The thermoplastic resin in the present invention is not particularly limited, and examples thereof include polyolefin resins such as polypropylene, high density polyethylene and low density polyethylene, vinyl resins such as polyvinyl chloride and polystyrene, and polyester resins such as polyethylene terephthalate. A thermoplastic resin may be used individually by 1 type, and may use 2 or more types together. Of these, polyolefin resins are preferable, and among the polyolefin resins, polypropylene is preferable. As the thermoplastic resin, a material that has already been subjected to a stretching process or the like, or an end material generated during extrusion of the resin (for example, a mimetic portion) may be used.

  The content of the thermoplastic resin may be appropriately set according to the amount of the inorganic particles and other components, but it is necessary to be less than 60% by mass with respect to the mass of the entire resin molded product, and the nail is easy to pass. Therefore, it is preferably less than 50% by mass, more preferably 45% by mass or less, and further preferably 40% by mass or less. On the other hand, since it is necessary to maintain an appropriate strength, the content of the thermoplastic resin is preferably 20% by mass or more, more preferably 25% by mass or more, and more preferably 30% by mass or more. Further preferred.

  The higher the melt flow rate (MFR) of the thermoplastic resin, the easier it is to hit the nail, so 0.1 g / 10 min or more (0.2 g / 10 min or more, 0.3 g / 10 min or more, 0. 4 g / 10 min or more, 0.5 g / 10 min or more, 0.6 g / 10 min or more, 0.7 g / 10 min or more, 0.8 g / 10 min or more, 0.9 g / 10 min or more, 1.0 g / 10 minutes or more, 1.2 g / 10 minutes or more, 1.4 g / 10 minutes or more, 1.6 g / 10 minutes or more, 1.8 g / 10 minutes or more, 2.0 g / 10 minutes or more, 3.0 g / 10 minutes 4.0 g / 10 min or more, 5.0 g / 10 min or more, 6.0 g / 10 min or more, 7.0 g / 10 min or more, 8.0 g / 10 min or more, 9.0 g / 10 min or more, 10.0 g / 10 min or more). On the other hand, the smaller the melt flow rate (MFR) of the thermoplastic resin is, the smaller the nail can be made to come off even if it is installed in an environment where the temperature tends to be high or low, 10.0 g / 10 min or less (9. 0 g / 10 min or less, 8.0 g / 10 min or less, 7.0 g / 10 min or less, 6.0 g / 10 min or less, 5.0 g / 10 min or less, 4.0 g / 10 min or less, 3.0 g / 10 minutes or less, 2.0 g / 10 minutes or less, 1.8 g / 10 minutes or less, 1.6 g / 10 minutes or less, 1.4 g / 10 minutes or less, 1.2 g / 10 minutes or less, 1.0 g / 10 minutes 0.9 g / 10 min or less, 0.8 g / 10 min or less, 0.7 g / 10 min or less, 0.6 g / 10 min or less, 0.5 g / 10 min or less, 0.4 g / 10 min or less, 0.3 g / 10 min or less, 0.2 g / 10 min or less, etc.).

  The melt mass flow rate is an index indicating the fluidity at the time of melting, and means a value measured according to JIS K 7210. In the present invention, the melt flow rate is specifically measured according to JIS K 7210 using a melt indexer under the conditions of a load of 21.18 N and a temperature of 230 ° C.

  The higher the molecular weight distribution (Mw / Mn) of the thermoplastic resin of the present invention is, the higher the nail becomes, the more easily 0.1 (0.2 or more, 0.3 or more, 0.4 or more, 0.00). 1. 5 or more, 0.6 or more, 0.7 or more, 0.8 or more, 0.9 or more, 1.0 or more, 1.2 or more, 1.4 or more, 1.6 or more, 1.8 or more 0 or more, 3.0 or more, 4.0 or more, 5.0 or more, 6.0 or more, 7.0 or more, 8.0 or more, 9.0 or more, 10.0 or more, 15.0 or more, etc.) Preferably there is. On the other hand, since the molecular weight distribution (Mw / Mn) of the thermoplastic resin is smaller, it is possible to make the nail difficult to remove even if it is installed in an environment where the temperature tends to be high or low. 10.0 or less, 9.0 or less, 8.0 or less, 7.0 or less, 6.0 or less, 5.0 or less, 4.0 or less, 3.0 or less, 2.0 or less, 1.8 or less 1.6, 1.4, 1.2, 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4 , 0.3 or less, 0.2 or less, etc.).

  In the present invention, the molecular weight distribution (Mw / Mn) of the thermoplastic resin is measured by a gel permeation (GPC) method.

(Porosity)
The porosity of the resin molded product of the present invention is not particularly limited as long as the porosity is in the range of 5 to 80%. However, the higher one makes it easier to hit the nail, so 5% or more (10% or more, 20 % Or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, etc.). On the other hand, since the porosity of the resin molded product of the present invention is smaller, it is possible to make it difficult for the nail to come out even when installed in an environment where the temperature tends to be high or low. 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, etc.).

  The porosity of the resin molded product of the present invention is determined by measuring the apparent density in accordance with “JIS K7222: 2005 foamed plastic and rubber—how to obtain the apparent density”, and based on the blending ratio of the thermoplastic resin and the inorganic particles, the porosity is 0. % Density is calculated, and the porosity is calculated from the ratio of the density with a porosity of 0% and the apparent density.

(Inorganic particles)
The amount of inorganic particles contained in the resin molded product in the present invention is not particularly limited as long as it is 40% by mass or more with respect to the mass of the entire resin molded product, but it is installed in an environment that tends to be higher or lower temperatures such as outdoors. However, since it is possible to make it difficult to remove the nail, it is preferably 50% by mass or more, more preferably 55% by mass or more, and more preferably 60% by mass or more. On the other hand, the amount of inorganic particles is preferably 80% by mass or less, more preferably 75% by mass or less, based on the total mass of the resin molded product, because the nail is easier when the amount is not too large. It is more preferable that it is 70 mass% or less.

  The content of the inorganic particles in the resin composition is measured by measuring the amount of residue using a chemical product weight loss and residue test method (JIS0067-1192). However, in the case of calcium carbonate, the generation of carbon dioxide is considered.

  The average particle size of the inorganic particles is not particularly limited, and for example, 0.1 μm or more (0.2 μm or more, 0.3 μm or more, 0.4 μm or more, 0.5 μm or more, 0.6 μm or more, 0.7 μm or more, 0.8 μm or more, 0.9 μm or more, 1.0 μm or more, 1.2 μm or more, 1.4 μm or more, 1.6 μm or more, 1.8 μm or more, 2.0 μm or more, 3.0 μm or more, 4.0 μm or more, 5.0 μm or more, 6.0 μm or more, 7.0 μm or more, 8.0 μm or more, 9.0 μm or more, 10.0 μm or more, 15.0 μm or more, 20.0 μm or more, 30.0 μm or more, 40.0 μm or more, etc. ) Is preferable. On the other hand, the smaller the average particle size of the inorganic particles, the more difficult the cracks are to spread during stretching and foaming, and it is easy to suppress deterioration over time of the resin, so 45 μm or less (40.0 μm or less, 30.0 μm or less). 20.0 μm or less, 15.0 μm or less, 10.0 μm or less, 9.0 μm or less, 8.0 μm or less, 7.0 μm or less, 6.0 μm or less, 5.0 μm or less, 4.0 μm or less, 3.0 μm or less 2.0 μm or less, 1.8 μm or less, 1.6 μm or less, 1.4 μm or less, 1.2 μm or less, 1.0 μm or less, 0.9 μm or less, 0.8 μm or less, 0.7 μm or less, 0.6 μm or less 0.5 μm or less, 0.4 μm or less, 0.3 μm or less, 0.2 μm or less, etc.).

  The type of inorganic particles contained in the resin composition is not particularly limited. For example, calcium carbonate, titanium oxide, silica, clay, talc, kaolin, aluminum hydroxide, calcium sulfate, barium sulfate, mica, zinc oxide, dolomite, Examples thereof include glass fiber, hollow glass microbeads, bentonite, and silicon earth. Of these, calcium carbonate is preferably used. These may be used alone or in combination of two or more. Moreover, in order to improve the dispersibility of the inorganic particles in the resin composition, the surface of the inorganic particles may be modified in advance according to a conventional method.

  In the present invention, the average particle size of the inorganic particles is measured with a laser diffraction particle size distribution measuring device.

  The volume (%) occupied by the inorganic particles in the resin molded body of the present invention is less than 60% (50% or less, 40% or less, 30% or less, 20% or less, etc.) because the lower one makes it easier to hit the nail. It is preferable that On the other hand, the volume percentage of the inorganic particles in the resin molded body of the present invention is 15% or more (20% or more) because the higher one makes it difficult to remove the nail even if it is installed in an environment that tends to be high or low. 30% or more, 40% or more, 50% or more, etc.). In addition, the volume which the inorganic particle accounts in the resin molding of this invention means the volume of the solid content in a resin molding except the volume of the space | gap in a resin molding.

  The volume (%) occupied by the inorganic particles in the resin molded body of the present invention is measured by differential thermal analysis (DTA).

  In the above-described resin composition, in addition to the above-described inorganic particles and thermoplastic resin, as an auxiliary agent, a foaming agent, a colorant, a lubricant, a coupling agent, a fluidity improver, a dispersant, an antioxidant, You may mix | blend a ultraviolet absorber, a stabilizer, an antistatic agent, etc.

  Although it does not specifically limit as a foaming agent, For example, aliphatic hydrocarbons (propane, normal butane, isobutane, normal pentane, isopentane, hexane etc.), alicyclic hydrocarbons (cyclohexane, cyclopentane, cyclobutane etc.), halogen Hydrocarbons (trifluoromonochloroethane, difluorodichloromethane, etc.) and the like. These foaming agents may be used individually by 1 type, and may be used in combination of 2 or more type.

  Examples of lubricants include stearic acid, hydroxystearic acid, complex stearic acid, oleic acid and other fatty acid lubricants, fatty alcohol lubricants, stearamide, oxystearamide, oleylamide, erucylamide, ricinolamide, behenamide, methylol Amide, methylene bisstearoamide, methylene bisstearobehenamide, bisamidic acid of higher fatty acid, aliphatic amide type lubricant such as complex amide, stearic acid-n-butyl, methyl hydroxystearate, polyhydric alcohol fatty acid ester, Examples thereof include aliphatic ester lubricants such as saturated fatty acid esters and ester waxes, and fatty acid metal soap group lubricants.

  As the antioxidant, phosphorus antioxidants, phenol antioxidants, and pentaerythritol antioxidants can be used. Phosphorus antioxidants, such as phosphorous esters, more specifically phosphorous esters and phosphate esters, are preferably used. Examples of phosphites include triphenyl phosphite, trisnonylphenyl phosphite, tris (2,4-di-tert-butylphenyl) phosphite, etc. Triester, diester, monoester of phosphorous acid, etc. Is mentioned.

  Examples of the phosphate ester include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, tris (nonylphenyl) phosphate, 2-ethylphenyl diphenyl phosphate, and the like. These phosphorus antioxidants may be used alone or in combination of two or more.

  Examples of phenolic antioxidants include α-tocopherol, butylhydroxytoluene, sinapyl alcohol, vitamin E, n-octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2- tert-Butyl-6- (3′-tert-butyl-5′-methyl-2′-hydroxybenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4- (N, N-dimethyl) Aminomethyl) phenol, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate diethyl ester, and tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxymethyl] methane Etc., and these can be used alone or in combination of two or more. The

(Use)
As a use of the resin molded body of the present invention, in particular, a building material (floor, pillar, wood deck, bench, etc.) where nails are struck during assembly (in this specification, abbreviated as “for nailing”). May be suitable). In addition, as described above, the resin molded body of the present invention is suitable for being installed outdoors because it is difficult for the nail to come out even if it is installed in an environment where the temperature tends to be high or low.

(Production method of resin molding)
The resin molded body of the present invention can be produced by a conventional molding method according to the purpose, for example, the above-described thermoplastic resin and inorganic particles. For example, extrusion molding (including profile extrusion molding), injection molding, vacuum molding. Etc. can be manufactured.

  In order to obtain a desired porosity, for example, when the thermoplastic resin and the inorganic particles are kneaded, the porosity may be adjusted by introducing a foaming agent. The amount of the foaming agent may be appropriately set according to the type of foaming agent and the desired porosity.

Alternatively, even if the thermoplastic resin is once formed into pellets and contains moisture, and then molded as it is without drying, voids are formed in the molded product. The porosity can be adjusted by, for example, the amount of moisture contained in the pellet. In such a case, the raw material thermoplastic resin may be pelletized by using a material that has already been subjected to a stretching treatment or the like, or an end material (for example, a portion of a mim) generated during extrusion of the resin.
The moisture content contained in the pellet is 0.30% by mass or more based on the mass of the inorganic particles contained in the pellet, and the content of the inorganic particles contained in the resin composition is based on the total amount of the resin composition. It is preferably 30% by mass or more.

<Resin products>
The present invention includes a resin product obtained by nailing the above-described resin molded body.

  The resin product is preferably one in which building materials (floor, pillar, wood deck, bench, etc.) are nailed and assembled, and the resin product of the present invention is suitable for being used outdoors.

<Production method of resin products>
This invention includes the manufacturing method of a resin product which has the process of hitting a nail to said resin molding. By the step of hitting the nail, the resin molded body can be assembled to produce a desired resin product.

  The nail may be hit by a conventionally known method. For example, the nail may be hit mechanically by a nail driver or the like, or the nail may be hit manually by a hammer or the like.

<Preparation of resin molded product>
Example 1
Polypropylene (MFR: 0.5, Mw / Mn: 10.3, 40% by mass with respect to the total mass of polypropylene and calcium carbonate), calcium carbonate (average particle size 1.5 μm, total mass of polypropylene and calcium carbonate) 60 mass%) was melt-kneaded, pelletized, and then directly molded by profile extrusion without drying to obtain a resin molded product according to Example 1. The porosity of the resin molded product was 7.85%.
The moisture content of the pellets was measured with an infrared moisture meter (FD-660 (manufactured by Kett Scientific Laboratory), in an atmosphere of 50% humidity and 23 ° C.). The pellet was allowed to evaporate moisture at 105 ° C., and the moisture content was calculated from the change in mass before and after the evaporation. The sample amount of pellets used was 10 g. As a result of the measurement, the water content with respect to the total mass of polypropylene and calcium carbonate was 0.40%, and the water content with respect to the mass of the inorganic particles contained in the pellets was 0.67%.

(Example 2)
As thermoplastic resins, polypropylene (40% by mass with respect to the total mass of polypropylene and calcium carbonate), calcium carbonate (60% by mass with respect to the total mass of polypropylene and calcium carbonate), foaming agent (Yewa Kasei Kogyo Co., Ltd.) ) Polyslene EE275F (decomposition temperature: 155 ° C., generated gas amount: 230 ml / 5 g) made by melt-kneading 1.0% by mass with respect to the resin, pelletized, and then directly molded by profile extrusion without drying. The resin molded product was obtained, and the porosity of the resin molded product was 12.74%.

(Comparative Example 1)
A resin molded product according to Comparative Example 1 was obtained by molding in the same manner as in Example 1 except that the pellet was dried after being melt-kneaded and then pelletized. The porosity of the resin molded product was 0.38%. Drying was performed at 110 ° C. for 12 hours using an air dryer NDO-420 manufactured by Tokyo Science Instrument Co., Ltd. The water content with respect to the total mass of polypropylene and calcium carbonate was 0.22%, and the water content with respect to the mass of the inorganic particles contained in the pellets was 0.37%.

<Evaluation of ease of nailing>
About the resin molded product which concerns on Example 1, 2, and the resin molded product which concerns on the comparative example 1, the ease of hitting a nail (50 mm in thickness 2.7 mm) was evaluated. The ease of hitting the nail was determined by hitting the nail with the same force and comparing the two.

  As a result, in Examples 1 and 2, all the nails pierced to the deep part. On the other hand, in the resin molded product of Comparative Example 1, the nail was not pierced to the deep part even though the nail was hit with the same force. From this result, it was suggested that the nail can be easily struck when the porosity is a predetermined value even if a lot of inorganic particles are contained.

Claims (7)

A resin molded body,
A thermoplastic resin and inorganic particles,
The porosity is 5 to 80%,
The resin molding which content of the said inorganic particle is 40 mass% or more with respect to the mass of the whole resin molding.   The resin molded body according to claim 1, wherein the inorganic particles include calcium carbonate particles.   The resin molding of Claim 1 or 2 in which the said thermoplastic resin contains a polypropylene.   The resin molded product according to any one of claims 1 to 3, which is used for nailing.   The resin molding in any one of Claim 1 to 4 installed outdoors.   A resin product obtained by nailing the resin molded body according to any one of claims 1 to 5.   The manufacturing method of a resin product which has the process of hitting a nail to the resin molding in any one of Claim 1 to 5.