KR20140033831A - Acrylate based impact modifier and environment-friendly polylactic acid resin composition comprising thereof - Google Patents

Abstract

The present invention relates to: an acryl based impact modifier which contains a specific amount of (meth)acrylic acid alkyl ester monomers with an alkyl group having 8-20 carbons on a core and shell of an impact modifier having a core-shell structure, shows a remarkable treatment effect on brittleness, a weakness of a polylactic acid resin, by enlarging the compatibility with the polylactic acid resin and increasing a dispersing effect of the impact modifier, and has excellent impact strength while maintaining transparency; and an environment-friendly polylactic acid resin composition comprising the same.

Description

Acrylic based impact modifier and environment-friendly polylactic acid resin composition comprising the same

The present invention relates to an acrylic impact modifier and an environmentally friendly polylactic acid resin composition comprising the same, and more particularly, to a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 or more carbon atoms in its core and shell. It contains the specific content and increases the compatibility with polylactic acid resin to increase the dispersion effect of impact modifiers, which significantly improves the brittleness, which is a disadvantage of polylactic acid resin. It relates to an impact modifier and an environmentally friendly polylactic acid resin composition comprising the same.

In general, as the problem of environmental pollution caused by waste polymers becomes a social problem, the necessity of environmentally friendly polymer materials is required. Recently, advanced economies such as Europe have introduced eco-friendly policies that restrict the use of hazardous substances that can cause environmental pollution problems and require the use of recycled products.

On the other hand, polylactic acid is widely used to occupy 20% of the entire bioplastics market due to its low cost, price, and excellent physical properties compared to other biodegradable plastics. It is spreading to parts and the like. By the way, the existing polylactic acid resin is very brittle and difficult to use in fields requiring impact resistance, and there is a problem in that productivity decreases during molding processing due to poor adhesiveness.

Recently, research has been conducted on blending polylactic acid and general purpose resin. When polylactic acid is blended with general-purpose resins, the amount of general-purpose resins derived from petroleum raw materials can be suppressed. As a result, the amount of petroleum raw materials can be suppressed, and the generation of carbon dioxide gas and the heat of combustion during disposal can be reduced. Therefore, there is a way to reduce the environmental burden.

In recent years, the method of improving heat resistance etc. is proposed using the composition containing an acrylonitrile butadiene-styrene (ABS) resin in polylactic acid resin. Styrene-based thermoplastic resins such as the ABS resin is excellent in impact resistance, mechanical strength, surface properties and processability, and is widely used in electric / electronic products, automotive interior / exterior parts, general goods, and the like.

In particular, when ABS and polyester resins are alloyed with polylactic acid in order to secure chemical resistance and impact resistance, there is a problem in that the compatibility between these resins is not sufficient, so that physical properties cannot be improved as expected.

Therefore, an object of the present invention is to solve the problems of the prior art, an acrylic impact that can significantly improve the brittleness of the polylactic acid resin while increasing the compatibility with the polylactic acid resin to increase the dispersion effect of the impact modifier. It is to provide a reinforcing agent and an environmentally friendly polylactic acid resin composition comprising the same.

In addition, another object of the present invention is to provide an environmentally friendly polylactic acid resin composition excellent in impact strength and adhesion while maintaining transparency.

In order to achieve the object of the present invention, the present inventors put a (meth) acrylic acid alkyl ester monomer having an alkyl group of 8 to 20 carbon atoms in the acrylic core and the shell, respectively, and increase the dispersion effect of the impact modifier, the disadvantage of the polylactic acid resin It was confirmed that the brittleness was significantly improved and the present invention was completed.

That is, according to the present invention,

An impact modifier comprising an acrylic core and an acrylic shell surrounding the acrylic core,

The acrylic core and the acrylic shell each comprise a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms,

The average particle diameter is 70 to 250 nm, provides an acrylic impact modifier, characterized in that the swelling index is in the range of 3 to 10.

Further, according to the present invention,

 (a) 37 to 94.9% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group of 7 or less carbon atoms; 5 to 60% by weight of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 or more carbon atoms; And (meth) acrylic acid allyl ester compound and at least 0.1 to 3% by weight of at least one comonomer selected from polyethylene glycol compound; to perform the polymerization to prepare an acrylic polymer core,

(b) 40 to 95% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 7 or less carbon atoms in the presence of the prepared core; 5 to 60% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 or more carbon atoms; Adding and performing graft polymerization to obtain a latex having a core-shell structure, and

(c) agglomerating the latex with acid, salt or polymer to obtain a graft copolymer having an average particle diameter of 70 to 250 nm and a swelling index within a range of 3 to 10; It provides a method for producing an acrylic impact modifier comprising a.

Further, according to the present invention,

It provides a polylactic acid resin composition comprising 5 to 20 parts by weight of the above-described acrylic impact modifier with respect to 100 parts by weight of polylactic acid.

In the present invention, an impact modifier composed of an acrylic core and an acrylic shell surrounding the acrylic core, wherein the acrylic core and the acrylic shell each comprise a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms, and has an average particle diameter. Is 70 to 250 nm, and the swelling index is characterized in that it is in the range of 3 to 10.

In particular, the acrylic core in the present invention is characterized in that it comprises a (meth) acrylic acid alkyl ester monomer having an alkyl group of 8 to 20 carbon atoms based on the total weight of the total monomer constituting the core within the range of 5 to 60% by weight.

In addition, the acrylic shell in the present invention is characterized in that it comprises a (meth) acrylic acid alkyl ester monomer having an alkyl group of 8 to 20 carbon atoms based on the total weight of the total monomer constituting the shell within the range of 5 to 60% by weight.

At this time, less than 5% by weight of transparency and impact strength is lowered, when more than 60% by weight of transparency is poor.

Wherein the (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms is lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate and stearyl (meth) acrylate It may be one or more selected from the group consisting of.

In this case, the acrylic core includes at least one comonomer selected from (meth) acrylic acid allyl ester-based and polyethylene glycol-based compounds within a range of 0.1 to 3% by weight based on the total weight of the entire monomers constituting the core. The range 3 to 10 may be satisfied. For reference, when the swelling index is less than 3, the crosslinking of the rubbery rubber occurs excessively, and as shown in the following examples, it can be seen that both Izod and fall dart impact strengths are reduced.

At this time, the polyethylene glycol-based compound is represented by the formula A- (CH ₂ -CH ₂ -O) _n -A, wherein A is an acrylate or methacrylate, n is an integer of 3 to 14, the weight average molecular weight ( Mn) may be a compound that is from 200 to 10,000.

In one example, the polyethylene glycol compound may be selected from the group consisting of polyethylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate.

It may also be replaced with a crosslinkable vinyl monomer such as divinylbenzene.

Specifically, in the present invention, the acrylic core has 37 to 94.9 wt% of (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms, 5 to 60 wt% of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms, and 0.1 to 3% by weight of at least one comonomer selected from (meth) acrylic acid allyl ester-based and polyethylene glycol-based compounds; It may be an acrylic rubber polymer polymerized.

When the (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms is less than 37% by weight, there is a disadvantage of lowering transparency, and when it exceeds 94.9% by weight, impact strength is lowered.

The particle diameter of the acrylic core may be in the range of approximately 50 to 240 nm.

Further, in the present invention, the acrylic shell is a (meth) acrylic acid alkyl ester monomer having from 5 to 60% by weight of (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms in the acrylic core, and an alkyl group having 8 to 20 carbon atoms (meth) acrylic acid alkyl ester monomer. weight%; It may be an acrylic latex polymerized.

Wherein the (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms is methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate It may be selected from the group consisting of hexyl (meth) acrylate and benzyl (meth) acrylate.

When the carbon number of the (meth) acrylic acid alkyl ester monomer having 7 or less is less than 40% by weight, there is no effect of improving transparency, and when it exceeds 95% by weight, there is a problem of lowering the impact strength.

The acryl-based latex thus obtained preferably has an average particle diameter in the range of 70 to 250 nm by acid, salt or polymer agglomeration, and when it exceeds 250 nm, transparency is lowered, and when it is less than 70 nm, impact strength and mold release property are lowered. . At this time, as the acid, but not limited thereto, acetic acid and the like can be used, and as the salt, but not limited thereto, a flocculant such as CaCl ₂ can be used.

In the present invention, the impact modifier is composed of 60 to 90% by weight of the acrylic core and 10 to 40% by weight of the acrylic shell, it can be applied to the polylactic acid is removed. At this time, if the core content is less than 60% by weight, as shown in the following examples, the Izod and fall dart impact strengths, and the releasability are reduced. If the content exceeds 90% by weight, the compatibility becomes poor.

Looking at the manufacturing method of these acrylic impact modifiers in detail.

(a) 37 to 94.9% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group of 7 or less carbon atoms; 5 to 60% by weight of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms; And 0.1 to 3% by weight of one or more comonomers selected from the (meth) acrylic acid allyl ester compound and the polyethylene glycol compound; and performing polymerization to prepare an acrylic polymer core (hereinafter referred to as a first step).

(b) 40 to 95% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 7 or less carbon atoms in the presence of the prepared core; 5 to 60% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms; Is added and the graft polymerization is carried out to obtain a latex having a core-shell structure (hereinafter referred to as second step).

(c) The latex is agglomerated with an acid, salt or polymer to obtain a graft copolymer having an average particle diameter of 70 to 250 nm and a swelling index within a range of 3 to 10 (hereinafter referred to as a third step).

In the above production method, the reaction medium, the initiator, the emulsifier, the catalyst, the stabilizer and the like can be used in a conventional content without particular limitation as long as it is known in the art. For example, the emulsifier may be selected from various kinds well known in the emulsion polymerization technique, preferably fatty acid salts such as fatty acid potassium salts, potassium oleate salts and alkali metal salts of weak acids. The polymerization initiator may be a water-soluble polymerization initiator such as sodium persulfate, potassium persulfate or a peroxy compound, or cumene hydroperoxide, diisopropyl benzenehydro peroxide, azobis isobutylnitrile or tertiary butyl hydroperoxide. Fat-soluble polymerization initiators such as, paramethane hydroperoxide, or benzoyl peroxide can be used. Regarding these, reference may be made to the description of the examples.

The polymerization conditions of the rubber latex and the graft polymerization step are also not particularly limited. For example, the first step and the second step may be performed for 2 to 4 hours at a temperature of 50 to 70 ℃, respectively.

In the third step, the aggregation may be performed by adding 0.2 to 8 parts by weight of a flocculant selected from CaCl 2, MgSO 4, HCl, H 2 SO 4, etc. at a temperature of 10 to 80 ° C. based on 100 parts by weight of the latex.

The present invention also provides a polylactic acid resin composition comprising the acrylic impact modifier 5 to 20 parts by weight based on 100 parts by weight of polylactic acid.

The resin composition may be flame retardant, lubricant, antioxidant, light stabilizer, reaction catalyst, release agent, pigment, antistatic agent, conductivity giving agent, EMI shielding agent, magnetic imparting agent, crosslinking agent, antibacterial agent, processing aid, metal deactivator, inhibitor It may further comprise one or more selected from the group consisting of a softener, a fluorine-based anti-drip agent, an inorganic filler, glass fibers, abrasion-resistant wear and coupling agents.

In one example, the polylactic acid is applied in a dehydrated state having a weight average molecular weight (Mw) in the range of 50,000 to 400,000, wherein 0.01 to 2 parts by weight of lubricant and 0.01 to 2 parts by weight of heat stabilizer based on 100 parts by weight of polylactic acid It can be configured to include.

The method of melt kneading and processing the polylactic acid resin, impact modifier, and other additives is not particularly limited, but specific examples thereof include, after primary mixing in a supermixer, a conventional twin screw extruder, single screw extruder, roll mill, kneader or balm mixer, etc. Melt kneading using one of the compounding machines, pellets are obtained by a pelletizer, and then sufficiently dried with a dehumidifying dryer or a hot air dryer, followed by injection molding to obtain a final molded product.

As described above, according to the present invention, it is possible to increase the compatibility with the polylactic acid resin to increase the dispersion effect of the impact modifier, significantly improving the brittleness of the polylactic acid resin, and at the same time impact strength while maintaining transparency With excellent adhesiveness and an environmentally friendly acrylic impact modifier, a manufacturing method and a polylactic acid resin composition comprising the same can be provided.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Changes and modifications may fall within the scope of the appended claims.

[Example]

Example  One

Rubber cast  Manufacture of cores

The parts by weight of the following compounds are shown based on 100 parts by weight of the monomer mixture used for the preparation of the rubbery core.

Into a reactor equipped with a stirrer, a thermometer, a nitrogen inlet, and a circulating condenser, 90 parts by weight of ion-exchanged water, 0.02 parts by weight of NaHCO3 as an additive, 0.001 parts by weight of ferrous sulfate, and 0.02 parts by weight of disodium ethylenediaminetetraacetate were added under a nitrogen atmosphere. The reactor internal temperature was maintained at 55 ° C.

 As the monomer preemulsion, 40 parts by weight of deionized water, 0.8 parts by weight of sodium laurylsulfonate, 63 parts by weight of butyl acrylate, 20 parts by weight of lauryl acrylate, 1 part by weight of allyl methacrylate as a crosslinking agent and polyethylene glycol dimethacryl 1 part by weight of the rate (of ethylene glycol 6) was added to prepare a monomer preemulsion.

Under the reactor internal temperature of 55 ° C., the polymerization reaction was carried out by simultaneously adding the monomer preemulsion, 0.07 part by weight of t-butyl hydroperoxide and 0.1 part by weight of sodium formaldehyde sulfoxylate as an initiator for 3 hours. 30 minutes after the completion of the monomer preemulsion, 0.01 parts by weight of t-butyl hydroperoxide and 0.01 parts by weight of sodium formaldehyde sulfoxylate were further added and aged for 1 hour.

Shell manufacturer

The weight percentages of the following compounds are based on 100% by weight of the monomer mixture used for the preparation of the shell, and parts by weight are based on 100 parts by weight of the monomer mixture.

85 wt% of the obtained rubber latex (based on solids) was added to a sealed reactor, and the reactor temperature was maintained at 55 ° C., 15 parts by weight of ion-exchanged water, 0.2 parts by weight of sodium laurylsulfonate, methyl A monomer preemulsion was prepared by adding 10 parts by weight of methacrylate and 5 parts by weight of lauryl methacrylate.

As a monomer preemulsion and an initiator, 0.03 parts by weight of t-butyl hydroperoxide and 0.03 parts by weight of sodium formaldehyde sulfoxylate were simultaneously added for 1 hour to proceed with the polymerization reaction. 30 minutes after the completion of the monomer preemulsion, 0.01 parts by weight of t-butyl hydroperoxide and 0.01 parts by weight of sodium formaldehyde sulfoxylate were further added and aged for 1 hour.

The prepared latex total solids content (TSC) was about 40% and the latex mean particle size was 130 nm.

Latex flocculation

The prepared latex was coagulated by adding 4 parts by weight of a CaCl 2 flocculant to 100 parts by weight of the latex at an agglomeration temperature of 40 ° C., separating the polymer and water, and then dehydrating and drying to obtain graft copolymer powder having an average particle diameter of 200 μm.

Example  2

In preparing the rubber core in Example 1, allyl methacrylate was not added, and 2 parts by weight of polyethylene glycol dimethacrylate was added.

Example  3

In preparing the rubber core in Example 1, it was carried out in the same manner as in Example 1 except that 2 parts by weight of allyl methacrylate was added without adding polyethylene glycol dimethacrylate.

Example  4

When preparing the rubber core in Example 1 was carried out in the same manner as in Example 1 except that 73 parts by weight of butyl acrylate, and 10 parts by weight of lauryl acrylate.

Example  5

In preparing the rubber core in Example 1, 10 parts by weight of lauryl acrylate and 10 parts by weight of 2-ethylhexyl acrylate were added, and 2-ethylhexyl methacrylate was added instead of lauryl methacrylate when preparing the shell. The same procedure as in Example 1 was conducted except for the one.

Comparative Example  One

In preparing the rubber core in Example 1, 43.6 parts by weight of butyl acrylate, 10 parts by weight of lauryl acrylate, and 0.7 parts by weight of polyethylene glycol diacrylate, 0.7 parts by weight of allyl methacrylate, and methyl when preparing the shell 35 parts by weight of methacrylate, 10 parts by weight of lauryl methacrylate was added and the rubber content (rubber core total content) was the same as in Example 1 except that 55%.

Comparative Example  2

Except for the swelling index of Example 1 except that the swelling index of 2.0 was added in an amount of 61 parts by weight of butyl acrylate, 3 parts by weight of polyethylene glycol diacrylate, and 2 parts by weight of allyl methacrylate. The same procedure was followed.

Comparative Example  3

In preparing the rubber core in Example 1, 0.4 parts by weight of sodium laurylsulfonate and 0.8 parts by weight of NaHCO 3 were added, and the same procedure as in Example 1 was performed except that the average particle diameter of the latex was 300 nm.

Comparative Example  4

In preparing the rubber core in Example 1, 1.5 parts by weight of sodium laurylsulfonate was added thereto, and the same procedure as in Example 1 was performed except that the average particle diameter of the latex was 50 nm.

Comparative Example  5

In preparing the rubber core in Example 1, 83 parts by weight of butyl acrylate was added without lauryl acrylate, and 15 parts by weight of methyl methacrylate was added without lauryl methacrylate. Except that was carried out in the same manner as in Example 1.

Comparative Example  6

15 parts by weight of methyl methacrylate and 5 parts by weight of lauryl methacrylate were polymerized in the same manner as in the shell preparation of Example 1 with respect to 80 parts by weight of polybutadiene latex prepared in advance to prepare an impact modifier having a polybutadiene core.

Comparative Example  7

A master batch was prepared by adding 10 parts by weight of MB870, a methyl methacrylate-butadiene-styrene impact modifier for LG transparent PVC.

[Test processing]

The impact modifiers obtained in Examples 1 to 5 and Comparative Examples 1 to 7 were used in 100 parts by weight of the polylactic acid resin previously dehydrated, 10 parts by weight, 0.5 parts by weight of the polymer lubricant, and 0.2 parts by weight of the heat stabilizer using a Haake Rheomix 600 Batch mixer. And melt mixed at 190 ° C. at 30 rpm for 10 minutes.

The physical properties of each of the processed compositions were evaluated as follows, and the results are summarized together in Table 1 below.

[Measurement of impact strength]: A melt mixed resin prepared by a Haake Rheomix mixer was compression molded at 200 ° C. for 10 minutes at 0.20 MPa to prepare a 3.2 mm thick specimen. The specimens were prepared with a notch depth of 2.54 mm for Izod impact test and measured at room temperature by ASTM D256. In addition, the fall dart impact test for the specimen was measured by ASTM 5420.

[Mold releasability measurement]: After the completion of the Haake Rheomix processing was evaluated by the five-point method according to the adhesive strength in the chamber of the molten mixed resin as follows:

5: very good, 4: good, 3: normal, 2: bad, 1: very bad.

[Swell index measurement]: 2g of each impact modifier powder and 50 ml of acetone were dissolved in a shaker for 48 hours, processed in a centrifuge at 20000 rpm, -10 ° C. for 4 hours, and separated from sol and gel and measured by the following equation. It was.

Swelling Index = gel weight swollen in acetone / dry gel weight.

[Haze Measurement]: A 1/8 in thickness specimen was measured by compression molding using an ASTM D1003 method using a Haze meter.

division practice
Example 1 practice
Example 2 practice
Example 3 practice
Example 4 practice
Example 5 compare
Example 1 compare
Example 2 compare
Example 3 compare
Example 4 compare
Example 5 compare
Example 6 Comparative Example 7 Rubber core BA 63 63 63 73 63 43.6 61 63 63 83 2-EHA 10 LA 20 20 20 10 10 10 20 20 20 (PEG) ₆ DMA One 2 One One 0.7 3 One One One AMA One 2 One One 0.7 2 One One One butadiene
core 80 Shell MMA 10 10 10 10 10 35 10 10 10 15 15 2-EHMA 5 LMA 5 5 5 5 10 5 5 5 5 Rubber content (wt%)
(Reference 60-90) 85 85 85 85 85 55 85 85 85 85 80 Swelling index
(Criteria 3-8) 4.5 7.0 3.5 5.5 4.0 6.1 2.0 5.1 5.9 6.0 5.3 Average particle size (nm)
(Reference 70-250nm) 130 140 120 135 132 130 150 300 50 132 200 Hayes
(Standard 5 or less) 2.9 3.8 2.5 3.0 2.8 3.0 3.2 6.0 2.3 5.5 12 80 Mold release
(4 or more criteria) 5 4 5 4 5 2 4 5 2 3 4 4 Izod impact strength
(kg.f.cm/cm2)
(7 or more criteria) 16 18 12 14 15 3.7 4.8 10 4.9 6.5 20 9 Fall dart impact strength (J)
(30 or more criteria) 48 43 38 44 47 15 19 38 16 22 52 28

* BA: n-butyl acrylate, 2-EHA: 2-ethylhexyl acrylate, LA: lauryl acrylate, (PEG) 6DMA: polyethylene glycol dimethacrylate (# of EO unit 6), AMA: allyl meta Acrylate, MMA: methyl methacrylate, 2-EHMA: 2-ethylhexyl methacrylate, LMA: lauryl methacrylate.

As shown in Table 1 above, polyethylene glycol is contained in the acrylic rubber core while including an acrylic rubber core and a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 or more carbon atoms in the shell, and specifying an average particle diameter and a swelling index range. Examples 1 to 5 including the system and / or (meth) acrylic acid allyl ester monomer as the comonomers are superior to the comparative examples 1 to 7 while maintaining the transparency of the polylactic acid and excellent impact strength and adhesion.

For reference, in Comparative Example 1 having a rubber content of less than 60%, it was confirmed that Izod and fall dart impact strength and releasability were reduced, and in Comparative Example 2 having a swelling index of less than 3, Izod and fall dart impact strength was found to decrease.

On the other hand, in Comparative Example 3 having an average particle diameter of more than 200 nm, haze was decreased, and in Comparative Example 4 having an average particle diameter of less than 70 nm, impact strength and releasability were confirmed to decrease.

Furthermore, in the case of the comparative example 5 which does not contain the (meth) acrylic-acid alkylester monomer which has a C8 or more alkyl group in a rubbery core and a shell, it confirmed that haze and impact strength fall.

In Comparative Example 6 using the butadiene rubber core, the impact strength was excellent, but the transparency decreased due to the difference in the refractive index of the matrix resin.

In addition, in the case of Comparative Example 7 using the methyl methacrylate-butadiene-styrene impact modifier, since the impact modifier itself is composed of a styrene copolymer having a high refractive index and a high glass transition temperature in the butadiene rubber to express transparency with PVC, polylactic acid It was confirmed that the difference in refractive index with the matrix resin became larger, resulting in a decrease in transparency and an effect of improving impact strength.

Claims (18)

An impact modifier comprising an acrylic core and an acrylic shell surrounding the acrylic core,
The acrylic core and the acrylic shell each comprise a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms,
Acrylic particle impact modifier, characterized in that the average particle diameter is 70 to 250 nm, the swelling index is in the range of 3 to 10.
The method of claim 1,
The acrylic core is an acrylic impact modifier, characterized in that it comprises a (meth) acrylic acid alkyl ester monomer having an alkyl group of 8 to 20 carbon atoms based on the total weight of the total monomer constituting the core within the range of 5 to 60% by weight.
The method of claim 1,
The acrylic shell is an acrylic impact modifier comprising a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms based on the total weight of the total monomer constituting the shell within the range of 5 to 60% by weight.
The method of claim 1,
The (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms includes lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate and stearyl (meth) acrylate. Acrylic impact modifier, characterized in that at least one selected from the group consisting of.
The method of claim 1,
The acrylic core is an acrylic impact modifier, characterized in that it comprises at least one comonomer selected from the (meth) acrylic acid allyl ester-based and polyethylene glycol compound in the range of 0.1 to 3% by weight based on the total weight of the total monomer constituting the core.
6. The method of claim 5,
The polyethylene glycol-based compound is represented by the formula A- (CH ₂ -CH ₂ -O) _n -A, wherein A is an acrylate or methacrylate, n is an integer of 3 to 14, the weight average molecular weight (Mn ) Is an acrylic impact modifier, characterized in that the compound is 200 to 10,000.
The method according to claim 6,
The polyethylene glycol-based compound is an acrylic impact modifier, characterized in that at least one selected from the group consisting of polyethylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate.
The method of claim 1,
The acrylic core has 37 to 94.9 wt% of (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms, 5 to 60 wt% of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms, and (meth) acrylic allyl ester 0.1 to 3% by weight of one or more comonomers selected from the group and polyethylene glycol compounds; Acrylic impact modifiers, characterized in that the polymerized acrylic rubber polymer.
The method of claim 1,
The acrylic shell may include 40 to 95 wt% of (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms in the acrylic core, and 5 to 60 wt% of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms; Acrylic impact modifier, characterized in that the acrylic latex polymerized.
10. The method according to claim 8 or 9,
The (meth) acrylic acid alkyl ester monomer having 7 or less carbon atoms includes methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, Acrylic impact modifiers, characterized in that at least one selected from the group consisting of hexyl (meth) acrylate and benzyl (meth) acrylate.
The method of claim 1,
The acrylic latex is an acrylic impact modifier, characterized in that having an average particle diameter range of 70 to 250 nm by acid, salt or polymer aggregation.
The method of claim 1, wherein
The impact modifier is an acrylic impact modifier, characterized in that consisting of 60 to 90% by weight of the acrylic core and 10 to 40% by weight of the acrylic shell.
The method of claim 1, wherein
The impact modifier is an acrylic impact modifier, characterized in that applied to the water-removed polylactic acid.
(a) 37 to 94.9% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group of 7 or less carbon atoms; 5 to 60% by weight of (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms; And (meth) acrylic acid allyl ester compound and at least 0.1 to 3% by weight of at least one comonomer selected from polyethylene glycol compound; to perform the polymerization to prepare an acrylic polymer core,
(b) 40 to 95% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 7 or less carbon atoms in the presence of 60 to 90 parts by weight of the prepared core; 5 to 60% by weight of a (meth) acrylic acid alkyl ester monomer having an alkyl group having 8 to 20 carbon atoms; Adding and performing graft polymerization to obtain a latex having a core-shell structure, and
(c) agglomerating the latex with acid, salt or polymer to obtain a graft copolymer having an average particle diameter of 70 to 250 nm and a swelling index within a range of 3 to 10; Method for producing an acrylic impact modifier, characterized in that comprises a.
15. The method of claim 14,
The step (a) is a method of producing an acrylic impact modifier, characterized in that carried out for 2 to 4 hours at a temperature of 50 to 70 ℃.
15. The method of claim 14,
The step (b) is a method of producing an acrylic impact modifier, characterized in that carried out for 2 to 4 hours at a temperature of 50 to 70 ℃.
The polylactic acid resin composition comprising an acrylic impact modifier of any one of claims 1 to 12 in an amount of 5 to 20 parts by weight based on 100 parts by weight of polylactic acid.
18. The method of claim 17,
The polylactic acid is applied in a dehydrated state, wherein the polylactic acid resin composition comprising 0.01 to 2 parts by weight of a lubricant and 0.01 to 2 parts by weight of a heat stabilizer, based on 100 parts by weight of polylactic acid.