JP5644362B2 - Resin composition and resin molded body - Google Patents

Description

  The present invention relates to a resin composition and a resin molded body.

Conventionally, various resin compositions have been provided and used for various applications. In particular, it is used for various parts and casings of home appliances and automobiles, and thermoplastic resin is also used for parts such as casings for office equipment and electronic and electrical equipment.
In recent years, with respect to environmental problems on a global scale, the use of plant-derived resins is highly expected as a material that can reduce greenhouse gas emissions. One of the conventionally known plant-derived resins is a cellulose derivative. Cellulose derivatives have heretofore been widely used in applications as paints and fibers, but there are almost no examples of cellulose derivatives used in resin moldings.

  For example, a cellulose ester (such as cellulose acetate having a total average substitution degree of 2.7 or less), a non-cellulose ester thermoplastic resin (such as an aromatic polyester resin or an aromatic polycarbonate resin), and a plasticizer (phosphorus) for the cellulose ester. A cellulose ester resin composition composed of an acid ester, a phthalate ester, and the like) and a bleed-out inhibitor (such as a condensed phosphate ester) is disclosed (for example, see Patent Document 1).

  In addition, (A) polylactic acid resin and (B) one or more kinds of resins selected from cellulose esters of 10% by mass to 75% by mass, (C) aromatic polycarbonate resin of 25% by mass to 90% by mass and (D) phase A solubilizer (for example, at least one selected from the group consisting of an inorganic filler, a polymer compound grafted or copolymerized with a glycidyl compound or an acid anhydride, a graft polymer having an aromatic polycarbonate chain, and an organometallic compound), (A ) And (B) and 1 part by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the total amount of component (C), and (E) a flame retardant, (F) a fluorine-based compound, ( G) A resin composition containing an epoxy compound is disclosed (see, for example, Patent Document 2).

Moreover, (A) thermoplastic polyester resin, (B) the fiber which has a cellulose as a main component, (C) the 1st flame retardant is contained, (A) :( B) = 95: 5-5: The (A) thermoplastic polyester resin contains a biomass material as part of the raw material, and (C) the first flame retardant is represented by the following formula (1) “(C ₃ H ₆ N ₆ ) a phosphate (melamine polyphosphate) having a 2,4,6-triamino-1,3,5-triazine skeleton represented by _n · H _{n + 2} P _n O _{3n + 1} , B) The fiber-reinforced flame-retardant resin, wherein the first flame retardant (C) is 1 to 20 parts by weight when the content of fibers mainly composed of cellulose is 100 parts by weight. The composition is disclosed (for example, refer patent document 3).

JP 2007-161943 A JP 2006-111858 A JP 2008-303288 A

  The subject of this invention is providing the resin composition which the dimensional stability of the resin molding obtained is improved.

The above object is achieved by the present invention described below.
That is, the invention according to claim 1
50 to 80 phr cellulose acetate propionate,
Polycarbonate from 20 phr to 50 phr,
Copolymer of ethylene, acrylic acid ester and glycidyl methacrylate, ladder structure or block structure copolymer, and polycarbonate resin is the main chain, and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is the side chain. A resin composition containing a total of 10 phr or more of a certain graft copolymer .

The invention according to claim 2
A copolymer of ladder structure or block structure obtained by copolymerizing ethylene, acrylate ester and glycidyl methacrylate, and a polycarbonate resin is a main chain, and an acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. The resin composition according to claim 1, comprising a graft copolymer of 10 phr or more and 30 phr or less in total.

The invention according to claim 3
Furthermore, the resin composition of Claim 1 or 2 containing 20 phr or more and 40 phr or less of the aromatic condensed phosphate ester compound represented by following Structural formula (1).

The invention according to claim 4
50 to 80 phr cellulose acetate propionate,
Polycarbonate from 20 phr to 50 phr,
Copolymer of ethylene, acrylic acid ester and glycidyl methacrylate, ladder structure or block structure copolymer, and polycarbonate resin is the main chain, and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is the side chain. A resin molded article containing a certain graft copolymer in a total of 10 phr or more and 30 phr or less.

The invention according to claim 5
A copolymer of ladder structure or block structure obtained by copolymerizing ethylene, acrylate ester and glycidyl methacrylate, and a polycarbonate resin is a main chain, and an acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. The resin molded product according to claim 4 , wherein the graft copolymer is a total of 10 phr or more and 30 phr or less.

The invention according to claim 6
Furthermore, the resin molding of Claim 4 or 5 containing 20 phr or more and 40 phr or less of aromatic condensed phosphate ester compounds represented by following Structural formula (1).

According to the invention of claim 1, in a composition comprising cellulose acetate propionate 50 phr or more and 80 phr or less and polycarbonate 20 phr or more and 50 phr or less , a ladder structure in which ethylene, an acrylate ester and glycidyl methacrylate are copolymerized. Or a block structure copolymer and a polycarbonate resin as a main chain, and a acrylonitrile-styrene copolymer modified with glycidyl methacrylate as a side chain does not contain a graft copolymer in a total of 10 phr or more. It is possible to provide a resin composition in which the dimensional stability of the obtained resin molded body is improved.
According to the invention of claim 2, a copolymer having a ladder structure or a block structure obtained by copolymerizing ethylene, an acrylate ester, and glycidyl methacrylate, and a polycarbonate resin are main chains, and are modified with glycidyl methacrylate. A resin composition can be provided in which the tensile strength of the resulting resin molded article is improved as compared with a case where a graft copolymer having a side chain of acrylonitrile-styrene copolymer is not contained in a total of 10 phr or more and 30 phr or less.
According to the invention of claim 3, the resin molding obtained is less than UL (underwriting laboratory: below), compared with the case where the aromatic condensed phosphate ester compound represented by the structural formula (1) is not contained in 20 phr or more and 40 phr or less. Similarly, it is possible to provide a resin composition that achieves V-1 or higher in the standard UL94 test.

According to the invention of claim 4, in a composition comprising cellulose acetate propionate 50 phr or more and 80 phr or less and polycarbonate 20 phr or more and 50 phr or less , a ladder structure obtained by copolymerizing ethylene, an acrylate ester and glycidyl methacrylate. Or a block structure copolymer and a polycarbonate resin as a main chain, and a acrylonitrile-styrene copolymer modified with glycidyl methacrylate as a side chain does not contain a graft copolymer in a total of 10 phr or more. It is possible to provide a resin molded body with improved dimensional stability.
According to the invention of claim 5, a copolymer having a ladder structure or a block structure obtained by copolymerizing ethylene, an acrylate ester, and glycidyl methacrylate, and a polycarbonate resin are main chains, and are modified with glycidyl methacrylate. A resin molded body having improved tensile strength can be provided as compared with the case where the graft copolymer in which the acrylonitrile-styrene copolymer is a side chain is not contained in a total of 10 phr or more and 30 phr or less.
According to the invention of claim 6, the resin molded product obtained in the UL standard UL94 test is V in comparison with a case where the aromatic condensed phosphate ester compound represented by the structural formula (1) is not contained in 20 phr or more and 40 phr or less. The resin molding which achieved -1 or more can be provided.

It is a schematic diagram which shows an example of the components of an electronic / electric equipment provided with the resin molding which concerns on this embodiment.

  Hereinafter, an embodiment as an example of the resin composition and the resin molded body of the present invention will be described.

[Resin composition]
The resin composition according to the present embodiment comprises cellulose acetate propionate, polycarbonate, a copolymer of ethylene, an acrylate ester, and glycidyl methacrylate , a polymer having a polycarbonate chain, and a copolymer of a glycidyl compound. It is a resin composition containing.
The cellulose acetate propionate content is 50 phr or more and 80 phr or less, the polycarbonate content is 20 phr or more and 50 phr or less, a copolymer of ethylene, an acrylate ester and glycidyl methacrylate , a polymer having a polycarbonate chain, and glycidyl The total content of the compound and the copolymer is 10 phr or more. However, a copolymer of a polymer having a polycarbonate chain and a copolymer of a glycidyl compound is a graft copolymer in which a polycarbonate resin is a main chain and an acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. The same applies to the following description.
“Phr” is an abbreviation for “per hundred resin”, and is “parts by mass” with respect to 100 parts by mass of all resin components (total of cellulose propionate and polycarbonate in this embodiment).

Here, conventionally, a resin composition having a composition containing a cellulose derivative (cellulose ester), a polycarbonate, and a compatibilizing agent is known.
However, in recent years, it is required to use a large amount of plant-derived resins against the background of environmental problems. Resin-molding obtained when plant-derived resins, that is, cellulose derivatives (cellulose esters), have a rich composition of 50 phr or more It has been found that the dimensional stability of the body is insufficient. This tendency may appear more prominently in a moist heat environment (which means a temperature of 65 ° C. and a humidity of 85%. Unless otherwise defined, this expression also means the same conditions below). I understand.

Therefore, in the resin composition according to the present embodiment, cellulose acetate propionate is selected as a cellulose derivative (cellulose ester), and in a composition including cellulose acetate propionate 50 phr to 80 phr and polycarbonate 20 phr to 50 phr, Two compatibilizers, a copolymer of ethylene, acrylate ester and glycidyl methacrylate , a polymer having a polycarbonate chain and a copolymer of glycidyl compound, are blended in a total amount of 10 phr or more.

With the composition described above, the dimensional stability of the obtained resin molded body is improved in the resin composition according to this embodiment. As a result, shrinkage of the resulting resin molding in a moist heat environment is suppressed, and for example, cracking of the resin molded body due to stress concentration or the like is suppressed.
The reason for this is not clear, but when the gel fraction of the resin composition according to the present embodiment is measured, the gel fraction is improved, so that ethylene, acrylate ester, and glycidyl methacrylate are used as compatibilizing agents. the copolymer (glycidyl methacrylate as a polymer component), a copolymer of the polymer and glycidyl compounds having polycarbonate chain and (glycidyl compound as the polymerization component), an epoxy group and a cellulose acetate propionate contained in the This is because it is presumed that a hydroxyl group contained in is bonded and a crosslinked structure is formed by this bond.

In addition, from the effect | action estimated as mentioned above, it is a crosslinked structure, so that the content of the copolymer of ethylene, an acrylic ester, and a glycidyl methacrylate, and the polymer of a polycarbonate chain, and the copolymer of a glycidyl compound increases. More will be formed. Therefore, theoretically, there is no upper limit in particular for the content of the copolymer of ethylene, acrylic acid ester and glycidyl methacrylate, and the polymer having a polycarbonate chain and the copolymer of glycidyl compound.

In particular, as a compatibilizer, a copolymer of ethylene, an acrylate ester and glycidyl methacrylate that imparts flexibility (particularly elongation), a polymer having a polycarbonate chain that imparts strength, and a copolymer of a glycidyl compound, When the two types of compatibilizers are applied, mechanical properties such as the compatibility (especially elongation) and strength of the obtained resin molded body can be provided, so that the dimensional stability of the resin molded body is improved. It is thought to improve.

In addition, with the above composition, the resin composition according to the present embodiment can also achieve reduction in gloss and improvement in mechanical properties (particularly elongation) of the obtained resin molding. By improving the mechanical characteristics (particularly elongation), for example, stress concentration due to screwing of a boss or the like, self-tapping or the like is easily dispersed, and breakage of the resin molded body is easily suppressed.
Here, the gloss of the resin molding is known to be caused by irregular reflection of different types of resins on the surface, but as a compatibilizing agent, a copolymer of ethylene, acrylate ester and glycidyl methacrylate and a polycarbonate chain are used. The resin (cellulose acetate propionate and polycarbonate) is dispersed to the extent that irregular reflection is difficult to occur by selecting the polymer and copolymer of the glycidyl compound, so that the gloss of the resulting resin molded product is reduced. It is thought.
And since resin (cellulose acetate propionate and a polycarbonate) is disperse | distributed, it is thought that a mechanical characteristic (especially elongation) improves.

  The resin composition according to the present embodiment has the same impact resistance and self-supporting properties as a resin molded body made of acrylonitrile / butadiene / styrene resin or a resin molded body made of acrylonitrile / butadiene / styrene resin and polycarbonate-ABS. A resin molded body having shape retainability (elastic modulus for realizing this) is obtained.

Moreover, the resin composition of this invention is good to contain 20 phr or more and 40 phr or less of the aromatic condensed phosphate ester compound represented by Structural formula (1) as a flame retardant.
Thereby, the obtained resin molding achieves V-1 or more in UL standard UL94 test.

  Hereinafter, the detail of each component of the resin composition which concerns on this embodiment is demonstrated.

(resin)
-Cellulose acetate propionate-
Cellulose acetate propionate is obtained by esterifying cellulose with propionic acid.

Here, from the viewpoint of improving the impact resistance of the resin molded product, the cellulose acetate propionate is a cellulose acetate propioate which is a plasticizer (for example, excluding phthalate ester, an absorptive plasticizer, a polyester plasticizer, etc.). It may contain 5 mass% or more and 25 mass% or less with respect to the nate.
If the content of the plasticizer is too small, it is difficult to obtain the impact resistance of the resin molded product, and if it is too large, the fluidity of the resin composition may be lowered, and the tensile strength of the resin molded product may be easily reduced. is there.

The weight average molecular weight of cellulose acetate propionate is not particularly limited, but is preferably in the range of 10,000 to 100,000, and more preferably in the range of 15,000 to 80,000. When the weight average molecular weight of cellulose acetate propionate is less than 10,000, the fluidity may be excessive and may not be processed. When the weight average molecular weight of cellulose acetate propionate exceeds 100,000, the fluidity is insufficient and cannot be processed. There is.
The weight average molecular weight is a value measured using a gel permeation chromatography apparatus (Prominence GPC type manufactured by Shimadzu Corporation) and using a Shim-pack GPC-80M as a measurement column.

Cellulose acetate propionate is contained in the resin composition at 50 phr or more and 80 phr or less, preferably 50 phr or more and 75 phr or less, more preferably 50 phr or more and 70 phr or less.
If this content is too small, it is difficult for the resin composition (its molded product) to be certified by the Japan Bioplastics Association under the “Green Plastic” or “Biomass Plastic” identification labeling system. The deflection temperature under load (heat deformation temperature HDT: Heat Defect Temperature) may be easily lowered.

-Polycarbonate-
The polycarbonate is not particularly limited, and examples thereof include those having (—O—R—OCO—) as a repeating unit. Examples of R include diphenylpropane and P-xylene. -O-R-O is not particularly limited as long as it is a dioxy compound.
Specific examples of the polycarbonate include aromatic polycarbonates such as bisphenol A type polycarbonate, bisphenol S type polycarbonate, and biphenyl type polycarbonate.
Polycarbonate may be a copolymer with silicone or undecamide.

  The weight average molecular weight of the polycarbonate is preferably in the range of 5000 to 30000, more preferably in the range of 10,000 to 25000. When the weight average molecular weight of the polycarbonate is less than 5,000, the fluidity may be excessive and the processability may be lowered. When the weight average molecular weight of the polycarbonate is more than 30,000, the fluidity may be insufficient and the processability may be lowered. is there.

The polycarbonate is contained in the resin composition at 20 phr or more and 50 phr or less, preferably 20 phr or more and 45 phr or less, more preferably 20 phr or more and 40 phr or less.
If this content is too small, the deflection temperature under load (heat deformation temperature HDT: Heat Deformation Temperature) of the resin molded product tends to decrease. On the other hand, if the content is too large, the resin composition (its molded product) becomes a Japanese bioplastic. It may be difficult to obtain certification for the “Green Plastic” or “Biomass Plastic” identification system by the association.

(Compatibilizer)
Examples of the compatibilizer include a copolymer of ethylene, an acrylate ester, and glycidyl methacrylate (hereinafter sometimes referred to as compatibilizer A), a polymer having a polycarbonate chain, and a copolymer of a glycidyl compound (hereinafter referred to as a phase compatibilizer). Two kinds of compatibilizers are sometimes applied.

-Compatibilizer A-
The compatibilizing agent A is obtained by copolymerizing ethylene, an acrylate ester, and glycidyl methacrylate . Structurally, it may be a ladder structure or a block copolymer structure .

In the compatibilizing agent A, the copolymerization ratio between the acrylic ester and glycidyl methacrylate is, for example, 100/100 or more and 1000/1 or less in mass ratio ( acrylic ester / glycidyl methacrylate ), preferably 100. / 50 to 1000/2, more preferably 100/50 to 1000/3.

  The weight average molecular weight of the compatibilizer A is, for example, preferably 500 or more and 100,000 or less, desirably 500 or more and 750,000 or less, and more desirably 500 or more and 50000 or less.

-Compatibilizer B-
The compatibilizing agent B is a copolymer obtained by copolymerizing a polymer having a polycarbonate chain and a glycidyl compound.

Examples of the polymer having a polycarbonate chain include a graft polymer of polycarbonate and another polymer.
Examples of the polycarbonate include those similar to the polycarbonate described as the resin component, and among these, polycarbonate is desirable.
Examples of the other polymer include acrylonitrile / styrene polymer, polyethylene, polymethyl methacrylate, and polymethacrylic acid. Among these, acrylonitrile / styrene polymer is desirable.

  In the polymer having a polycarbonate chain, the copolymerization ratio of the polycarbonate and the other polymer is, for example, preferably 5/100 or more and 100/5 or less in mass ratio (polycarbonate / other polymer), and preferably 10 / It is 100 or more and 100/10 or less, more desirably 10/100 or more and 100/15 or less.

  On the other hand, examples of the glycidyl compound include glycidyl methacrylate and glycidyl acrylate, and glycidyl methacrylate is preferable.

  Specific examples of the compatibilizer B include, for example, a copolymer of an aromatic polycarbonate and a graft polymer of acrylonitrile / styrene polymer and glycidyl methacrylate (GMA), a copolymer of a polycarbonate polymer, acrylonitrile / styrene polymer and GMA, and the like. Is mentioned.

  In the compatibilizing agent B, the copolymerization ratio between the polymer having a polycarbonate chain and the glycidyl compound is, for example, 100/100 or more and 1000/1 or less in terms of mass ratio (polymer having a polycarbonate chain / glycidyl compound). It is preferably 100/50 or more and 1000/2 or less, more preferably 100/50 or more and 1000/3 or less.

  The weight average molecular weight of the compatibilizing agent B is, for example, preferably 500 or more and 100,000 or less, desirably 500 or more and 750,000 or less, and more desirably 500 or more and 50000 or less.

-Content of compatibilizer-
The two compatibilizers, Compatibilizer A and Compatibilizer B, are included in the resin composition in a total of 10 phr or more, preferably 15 phr or more and 30 phr or less, more preferably 15 phr or more and 20 phr or less. It is good.
When this content is less than 10 phr, the dimensional stability of the resin molded body may be difficult to be realized, or the moldability of the resin composition may be easily lowered.
If the contents of the two compatibilizers, compatibilizer A and compatibilizer B, are increased to some extent, the tensile strength of the molded product obtained by the action of the compatibilizer itself tends to decrease. Therefore, when using a resin molding for the use which considered tensile strength, it is good to contain at 20 phr or less.

  In addition, when other components are copolymerized with the two compatibilizers, compatibilizer A and compatibilizer B, the compatibility with cellulose acetate propionate and polycarbonate constituting the resin composition is increased. The content in the resin composition is suitably adjusted within the above range so as not to be damaged. For example, when using a compatibilizer containing a large amount of polycarbonate as the other component for a resin composition having a relatively high polycarbonate content and a resin composition having a small content, the polycarbonate content is relatively high. It is good to adjust so that a compatibilizer may be contained more with respect to the resin composition relatively fewer than a resin composition.

Here, the compatibilizing agent B is 1.5 to 2.5 times in mass with respect to the compatibilizing agent A (preferably 1.5 to 2.4 times, more preferably 1.5 to 2 times. 0.0 times or less) in the resin composition.
By making the amount ratio of the compatibilizer A imparting flexibility and the compatibilizer B imparting strength to the resin molded body within the above range, the flexibility (particularly the elongation of the resin molded body). ) And strength are easily achieved.

(Flame retardants)
Examples of the flame retardant include various flame retardants such as a phosphorus flame retardant, a silicone phosphorus flame retardant, a nitrogen-containing phosphorus flame retardant, a sulfuric acid phosphorus flame retardant, and an inorganic hydroxide phosphorus flame retardant.

Among these, the aromatic condensed phosphate ester compound represented by the following structural formula (1) (chemical name: 1,3 phenylene bis (di2,6 xylenyl phosphate)) is particularly preferable as a flame retardant. Is mentioned.
With the aromatic condensed phosphate compound represented by the following structural formula (1), the resin molded product achieves V-1 or higher in the UL standard UL94 test.

The flame retardant (in particular, the aromatic condensed phosphate ester compound) may be contained in the resin composition at, for example, 20 Phr or more and 40 Phr or less.
If this content is too small, it becomes difficult for the resin molded body to achieve V-1 or higher in the UL standard UL94 test, whereas if it is too much, the moldability of the resin composition may be lowered.

  When the aromatic condensed phosphate compound is used as the flame retardant, in addition to the aromatic condensed phosphate compound, the flame retardant may be used in combination with another flame retardant. In this case, as a whole flame retardant, it is good to use 50 mass% or more of aromatic condensed phosphate ester compounds.

Here, the resin composition according to the present embodiment may include a flame retardant aid in addition to the flame retardant. Although it does not restrict | limit especially as a flame retardant adjuvant, For example, a boric acid flame retardant adjuvant, an Ammon flame retardant adjuvant, an inorganic flame retardant adjuvant, a nitrogen flame retardant adjuvant, an organic flame retardant adjuvant And at least one selected from the group consisting of colloidal flame retardant aids.
Examples of boric acid flame retardant aids include compounds containing boric acid such as zinc borate hydrate, barium metaborate, and borax.
Examples of ammon-based flame retardant aids include ammonia compounds such as ammonium sulfate.
Examples of inorganic flame retardant assistants include iron oxide combustion catalysts such as ferrocene, titanium-containing compounds such as titanium oxide, guanidine compounds such as guanidine sulfamate, zirconium compounds, molybdenum compounds, and tin. Examples thereof include carbonate compounds, carbonate compounds such as potassium carbonate, hydrated metals such as aluminum hydroxide and magnesium hydroxide, and modified products thereof.
Examples of the nitrogen-based flame retardant aid include cyanurate compounds having a triazine ring.
Examples of organic flame retardant aids include chlorendic anhydride, phthalic anhydride, compounds containing bisphenol A, glycidyl compounds such as glycidyl ether, polyhydric alcohols such as diethylene glycol and pentaerythritol, modified carbamides, silicone oils, organo Examples thereof include silicone compounds such as siloxane, phosphate compounds, and phosphate ester compounds.
Examples of colloidal flame retardant aids include conventionally used hydrated metal compounds such as flame retardant aluminum hydroxide, magnesium hydroxide, calcium hydroxide, calcium aluminate, dihydrate gypsum, and boron. Hydrates such as zinc oxide, barium metaborate, borax, kaolin clay, nitrate compounds such as sodium nitrate, colloids of flame retardant compounds such as molybdenum compounds, zirconium compounds, antimony compounds, dosonite, and progopite.

(Other ingredients)
The resin composition according to the present embodiment may contain other components in addition to the above components as long as the effects are not impaired.
Examples of other components include plasticizers, antioxidants, mold release agents, light proofing agents, weathering agents, colorants, pigments, modifiers, antistatic agents, antihydrolysis agents, fillers, reinforcing agents ( Glass fiber, carbon fiber, talc, clay, mica, glass flake, milled glass, glass bead, crystalline silica, alumina, silicon nitride, alumina nitride, boron nitride, etc.).
In the resin composition, the other component is, for example, preferably 0 phr or more and 10 phr or less, and more preferably 0 phr or more and 5 phr or less. Here, “0 phr” means a form containing no other components.

(Production method of resin composition)
The resin composition according to this embodiment is produced by melting and kneading the above components.
Here, a known means can be used as the melt kneading means, and examples thereof include a twin screw extruder, a Henschel mixer, a Banbury mixer, a single screw extruder, a multi-screw extruder, and a kneader.

[Resin molding]
The resin molding which concerns on this embodiment is comprised including the resin composition which concerns on the said this embodiment. Specifically, the resin molded body according to the present embodiment is obtained by molding the resin composition according to the present embodiment.
For example, the resin composition according to the present embodiment is molded by a molding method such as injection molding, extrusion molding, blow molding, hot press molding, calendar molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding, The resin molding which concerns on this embodiment is obtained.

Here, as a molding temperature (for example, extrusion temperature, injection temperature) of the resin composition concerning the above-mentioned embodiment, it is good that it is 180 ° C or more and 230 ° C or less, for example.
Here, the polycarbonate originally requires a molding temperature of 240 ° C. or more, but by using two compatibilizers, compatibilizer A and compatibilizer B, together with cellulose acetate propionate, Molding at the molding temperature is realized.

  The injection molding may be performed using a commercially available apparatus such as NEX500, NEX150 manufactured by Nissei Plastic Industry, NEX70000 manufactured by Nissei Plastic Industry, SE50D manufactured by Toshiba Machine. At this time, the cylinder temperature is preferably in the range of 170 ° C. or higher and 230 ° C. or lower, and more preferably in the range of 180 ° C. or higher and 230 ° C. or lower, from the viewpoint of suppressing decomposition of the resin. The mold temperature is preferably in the range of 30 ° C. to 100 ° C., more preferably in the range of 30 ° C. to 60 ° C. from the viewpoint of productivity.

  The resin molded body according to the present embodiment is suitably used for applications such as electronic / electrical equipment, home appliances, containers, automobile interior materials, and the like. More specifically, housings such as home appliances and electronic / electrical equipment, various parts, wrapping films, storage cases such as CD-ROMs and DVDs, tableware, food trays, beverage bottles, chemical wrap materials, etc. Especially, it is suitable for parts of electronic / electric equipment.

FIG. 1 is an external perspective view of an image forming apparatus, which is an example of a part of an electronic / electric device provided with a molded body according to the present embodiment, as viewed from the front side.
The image forming apparatus 100 in FIG. 1 includes front covers 120 a and 120 b on the front surface of the main body device 110. These front covers 120a and 120b can be freely opened and closed so that an operator can operate the inside of the apparatus. Thus, the operator replenishes the toner when the toner is exhausted, replaces the exhausted process cartridge, or removes the jammed paper when a paper jam occurs in the apparatus. FIG. 1 shows the apparatus with the front covers 120a and 120b opened.

  On the upper surface of the main unit 110, an operation panel 130 on which various conditions relating to image formation such as a paper size and the number of copies are input by an operation of an operator, and a copy glass 132 on which a document to be read is arranged are provided. Yes. In addition, the main body device 110 includes an automatic document conveying device 134 that conveys a document on the copy glass 132 at the top thereof. Further, main device 110 includes an image reading device that scans a document image placed on copy glass 132 and obtains image data representing the document image. Image data obtained by the image reading apparatus is sent to the image forming unit via the control unit. Note that the image reading device and the control unit are housed in a housing 150 that forms part of the main body device 110. The image forming unit is provided in the housing 150 as a detachable process cartridge 142. The process cartridge 142 is attached and detached by turning the operation lever 144.

  A toner container 146 is attached to the casing 150 of the main body device 110, and toner is replenished from the toner supply port 148. The toner stored in the toner storage unit 146 is supplied to the developing device.

  On the other hand, sheet storage cassettes 140a, 140b, and 140c are provided at the lower portion of the main unit 110. In addition, the main body apparatus 110 has a plurality of conveying rollers formed of a pair of rollers arranged in the apparatus, thereby forming a conveying path through which the sheets of the sheet storage cassette are conveyed to the upper image forming unit. ing. The paper in each paper storage cassette is taken out one by one by a paper take-out mechanism disposed near the end of the transport path and sent out to the transport path. Further, a manual paper supply unit 136 is provided on a side surface of the main apparatus 110, and paper is supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred between two fixing rolls that are supported by a casing 152 that forms part of the main body device 110 and is in contact with each other. Paper is discharged to the outside. The main body device 110 is provided with a plurality of paper discharge sections 138 on the side opposite to the side where the paper supply section 136 is provided, and the paper after image formation is discharged to these paper discharge sections.

  In the image forming apparatus 100, for example, the resin molded body according to the present embodiment is used for the front covers 120a and 120b, the exterior of the process cartridge 142, the casing 150, and the casing 152.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[Examples 1-31, Comparative Examples 1-10]
The components according to Tables 1 to 5 were kneaded at a cylinder temperature of 210 ° C. with a biaxial kneader (Toshiba Machine, TEM58SS) to obtain resin composition pellets.
The obtained pellets were injection molded at a cylinder temperature of 210 ° C. and a mold temperature of 50 ° C. using an injection molding machine (product name “NEX500” manufactured by Toshiba Machine Co., Ltd.), and ISO multipurpose dumbbell test pieces (ISO527 tensile test, ISO178). Corresponding to a bending test, a test part thickness of 4 mm and a width of 10 mm) and a UL test piece for V test in UL-94 (thickness: 0.8 mm, 1.6 mm) were molded.

[Evaluation]
(Plant degree)
About the resin composition used in each example, the plant degree was computed by the following formula.
Formula: Plant degree = cellulose acetate propionate mass × (cellulose mass / cellulose acetate propionate mass) / total mass

(Glossy)
The obtained ISO multipurpose dumbbell test piece was visually observed and examined for gloss.

(Flame retardance)
-UL-V test-
Using the UL test piece for V test, the UL-V test was performed in the UL chamber (manufactured by Toyo Seiki Co., Ltd.) in accordance with the method prescribed in the UL-94HB test. The display of the results is V-0, V-1, V-2, HB in order from the higher flame retardancy, and indicates the case where it is inferior to HB, that is, the case where the test piece has spread, as “failure”. It was.
In addition, since the injection molding could not be performed and the test piece could not be manufactured, the study was stopped because it was practically impossible to produce.

(Mechanical properties)
-Tensile strength, elongation-
Using an ISO multi-purpose dumbbell test piece, tensile strength and elongation were measured with an evaluation apparatus (manufactured by Shimadzu Corporation, precision universal testing machine Autograph AG-IS 5 kN) in accordance with ISO 527.

-Impact resistance-
The ISO multi-purpose dumbbell test piece was notched and used to measure the impact resistance from the Charpy impact test using an evaluation device (DG-UB2 manufactured by Toyo Seiki Co., Ltd.) in accordance with JIS-K7111 (2006). .

-Deflection temperature under load (HDT)-
Using an ISO multi-purpose dumbbell test piece, the deflection temperature under a load of 1.8 MPa was measured using an HDT measuring device (manufactured by Toyo Seiki Co., Ltd., HDT-3) in accordance with the ISO 178 bending test.

(Moisture and heat resistance)
-Impact resistance after wet heat test-
A wet heat test was performed on the ISO multipurpose dumbbell test piece as follows, and the impact resistance was measured in the same manner as described above.
The wet heat test was performed with a wet heat tester (THN042PA; manufactured by ADVANTEC) under conditions of 65 ° C. × 85% × 400 hours.

-Dimensional stability-
Before and after performing the wet heat test on the ISO multipurpose dumbbell test piece, the dimensional change (before the wet heat test / after the wet heat test) of the dumbbell test piece was examined.

Details of Tables 1 to 5 are as follows.
-Resin-
CAP482 (manufactured by Eastman Chemical): cellulose acetate propionate TP360A40000-12 (manufactured by Eastman Chemical): cellulose acetate propionate Caliber 200 (manufactured by Sumitomo Dow): polycarbonate (weight average molecular weight of about 26000)
-Compatibilizer-
Modiper CL430G (manufactured by NOF Corporation): Graft copolymer in which polycarbonate resin is the main chain and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. Lotadar 8900 (manufactured by Arkema): ethylene and acrylic acid Copolymer of ester and glycidyl methacrylate (GMA)-Flame retardant-
PX-200 (manufactured by Daihachi Chemical Co., Ltd.): aromatic condensed phosphate ester compound represented by structural formula (1) CR-741 (manufactured by Daihachi Chemical Co., Ltd.): Refer to the structural formula below PX-202 (large Hachigaku Co., Ltd.): Refer to the following structural formula-Flame retardant aid-
・ Apinon 901 (manufactured by Sanwa Chemical Co., Ltd.): Melamine sulfate

In this example, in addition to polycarbonate and cellulose acetate propionate, dimensional stability was improved as compared with the comparative example by using two kinds of compatibilizers as specific compatibilizers. Furthermore, flame retardance of V-1 or higher was obtained by using a specific amount of a specific flame retardant together.
From the above results, it can be seen that the resin composition according to the present embodiment is excellent in dimensional stability when formed into a molded body and is suitable for manufacturing a housing of an image forming apparatus. In addition, it can be seen that the resin molded body according to the present embodiment is excellent in dimensional stability and is suitable for a housing of an image forming apparatus.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 110 Main body apparatus 120a, 120b Front cover 136 Paper supply part 138 Paper discharge part 142 Process cartridge 150, 152 Case

Claims (6)

50 to 80 phr cellulose acetate propionate,
Polycarbonate from 20 phr to 50 phr,
Copolymer of ethylene, acrylic acid ester and glycidyl methacrylate, ladder structure or block structure copolymer, and polycarbonate resin is the main chain, and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is the side chain. A resin composition containing a total of 10 phr or more of a certain graft copolymer . A copolymer of ladder structure or block structure obtained by copolymerizing ethylene, acrylate ester and glycidyl methacrylate, and a polycarbonate resin is a main chain, and an acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. The resin composition according to claim 1, comprising a graft copolymer of 10 phr or more and 30 phr or less in total. Furthermore, the resin composition of Claim 1 or 2 containing 20 phr or more and 40 phr or less of the aromatic condensed phosphate ester compound represented by following Structural formula (1).
50 to 80 phr cellulose acetate propionate,
Polycarbonate from 20 phr to 50 phr,
Copolymer of ethylene, acrylic acid ester and glycidyl methacrylate, ladder structure or block structure copolymer, and polycarbonate resin is the main chain, and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is the side chain. A resin molded article containing a certain graft copolymer in a total of 10 phr or more and 30 phr or less. A copolymer of ladder structure or block structure obtained by copolymerizing ethylene, acrylate ester and glycidyl methacrylate, and a polycarbonate resin is a main chain, and an acrylonitrile-styrene copolymer modified with glycidyl methacrylate is a side chain. The resin molded product according to claim 4 , wherein the graft copolymer is a total of 10 phr or more and 30 phr or less. Furthermore, the resin molding of Claim 4 or 5 containing 20 phr or more and 40 phr or less of aromatic condensed phosphate ester compounds represented by following Structural formula (1).