KR20220011087A - Thermoplastic resin and method for preparing the same - Google Patents

Abstract

The present invention relates to a thermoplastic resin showing excellent impact strength, gloss and flowability at the same time and having excellent whitening-free property, and a method for preparing the same. The thermoplastic resin according to the present invention includes (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or includes: (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin including at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, alkyl methacrylate and alkyl acrylate, wherein the total alkyl acrylate content is 20-50 wt%, and the butyl acrylate coverage value (X) calculated according to mathematical formula 1 of X = {(G-Y)/Y} * 100 (wherein G represents the total gel content (%) of the thermoplastic resin, and Y represents wt% of butyl acrylate in the gel of the thermoplastic resin) is 50 or more.

Description

Thermoplastic resin and its manufacturing method

The present invention relates to a thermoplastic resin, and more particularly, impact strength, gloss, fluidity and The present invention relates to a thermoplastic resin having excellent colorability and excellent non-whitening properties because whitening does not occur during bending or hitting, and a method for manufacturing the same.

Acrylonitrile-butadiene-styrene resin (hereinafter referred to as 'ABS resin') based on conjugated diene rubber has excellent processability, mechanical properties and appearance characteristics, so parts for electrical and electronic products, automobiles, small toys, and furniture , building materials, etc. are widely used. However, since the ABS resin is based on butadiene rubber containing chemically unstable unsaturated bonds, the rubber polymer is easily aged by ultraviolet rays, and the weather resistance is very weak, so it is not suitable as an outdoor material. In order to solve this problem, a method of using the ABS resin after painting has been proposed, but environmental contamination during painting treatment is a problem, and the painted product is difficult to recycle and has poor durability.

In order to overcome the problems of the ABS resin as described above, an acrylic copolymer represented by an acrylate-styrene-acrylonitrile graft copolymer (hereinafter referred to as 'ASA resin') without an ethylenically unsaturated bond is used. . ASA resin has excellent properties such as processability, impact resistance, chemical resistance and weather resistance, so it is widely used in various fields such as construction materials, interior and exterior materials of vehicles such as automobiles and motorcycles, electrical and electronic products, as well as ships, leisure products, and gardening products. , its demand is rapidly increasing. However, the ASA resin is inferior to the ABS resin coating product in appearance characteristics such as colorability, and the weather resistance level required in the market is gradually increasing, which is insufficient to satisfy this.

On the other hand, as the market demands for emotional quality and its level increase, research is being conducted to realize a luxurious appearance, excellent colorability and weather resistance by finishing the outer surface of substrates such as ABS, PVC, and iron plate with a thermoplastic resin. . These finishing materials are mainly manufactured in the form of a film and then go through a bending process such as bending or folding according to the shape of the substrate to be applied to manufacture a final product. However, due to the characteristics of the thermoplastic ASA resin, when the above-mentioned finishing treatment is applied at room temperature, there is a problem in that the original color is lost and the aesthetics is deteriorated.

It is analyzed that this whitening phenomenon is caused by voids due to cracks occurring inside the thermoplastic resin during bending. In order to solve this problem, a method of improving whitening properties by adjusting the rubber content in the thermoplastic resin or by mixing the thermoplastic resin and the elastomer to soften the thermoplastic resin has been proposed. However, through this, the occurrence of whitening can be improved, but there is a problem in that other mechanical properties, colorability, surface gloss, etc. are deteriorated, and development of a thermoplastic resin composition excellent in all of these physical properties is insufficient, and the whitening property is also It is not satisfactory.

Japanese registered patent JP 1995-033470 B2

In order to solve the problems of the prior art as described above, the present invention is a thermoplastic resin having excellent non-whitening properties by suppressing whitening even when bending or hitting while having excellent impact strength, gloss, weather resistance, colorability and fluidity at the same time, and a method for manufacturing the same is intended to provide Another object of the present invention is to provide a molded article made of the above thermoplastic resin.

The above and other objects of the present invention can all be achieved by the present invention described below.

In order to achieve the above object, the present invention comprises (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% , and the butyl acrylate coverage value (X) calculated by Equation 1 below provides a thermoplastic resin, characterized in that it is 50 or more.

[Equation 1]

X = {(G-Y)/Y} * 100

(In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.)

The present invention also relates to a composition comprising (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% It provides a thermoplastic resin, characterized in that the elution amount of butyl acrylate in acetone is 0.1% by weight or more.

The present invention also relates to a composition comprising (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% And, the (A) copolymer is, based on the total weight of the (A) copolymer, (a-1) an alkyl acrylate rubber 25 having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm to 50% by weight; And (a-2) an alkyl acrylate-alkyl methacrylate copolymer 50 to 75% by weight; provides a thermoplastic resin comprising a.

The thermoplastic resin is preferably 50 to 100% by weight of the (A) alkyl acrylate-alkyl methacrylate graft copolymer, the (B) aromatic vinyl compound, vinyl cyan compound, alkyl methacrylate and alkyl acryl The matrix resin comprising at least one selected from the group consisting of rate may be preferably included in an amount of 0 to 50 wt%.

The thermoplastic resin may preferably have an elution amount of butyl acrylate in acetone of 0.1 wt% or more.

The copolymer (A) is preferably (a-1) an alkyl acrylate rubber having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm based on 100 wt% of the (A) copolymer. 50% by weight; and (a-2) 50 to 75 wt% of an alkyl acrylate-alkyl methacrylate copolymer.

The graft ratio of the copolymer (A) is preferably 60 to 200%, and the weight average molecular weight of the copolymer (a-2) may be 40,000 to 120,000 g/mol.

The glass transition temperature of the thermoplastic resin, the (a-1) rubber, or both of them may be preferably -50 to -20 ℃.

The rubber (a-1) may further include preferably an alkyl methacrylate, in which case the alkyl methacrylate is preferably 0.1 to 25% by weight based on 100% by weight of the (a-1) rubber. can be included as

The copolymer (a-2) preferably comprises 80 to 99.9% by weight of an alkyl methacrylate and 0.1 to 20% by weight of an alkyl acrylate based on 100% by weight of the copolymer (a-2) It may be a copolymer.

The copolymer (A) may preferably have a graft frequency of 0.05 to 0.375% calculated by Equation 2 below.

[Equation 2]

Graft frequency (%) = [Graft rate / {weight average molecular weight of parts excluding rubber}] * 100

The matrix resin (B) is preferably an aromatic vinyl compound-vinyl cyan compound copolymer, an aromatic vinyl compound-vinyl cyan compound-alkyl methacrylate copolymer, an alkyl methacrylate polymer and an alkyl methacrylate-alkyl acrylate copolymer. It may be at least one selected from the group consisting of coalescing, and may further include an aromatic vinyl compound-vinyl cyan compound-alkyl acrylate copolymer.

The thermoplastic resin is preferably extruded into a film having a thickness of 0.15 mm, and a weight of 1 kg is applied vertically onto the film at a height of 100 mm using a Gardner impact tester under a temperature of 23° C. When dropped, the difference in haze values measured according to ASTM D1003-95 before and after the impact of the impact part impacted by the weight (strike) may be 10 or less.

In addition, the present invention comprises (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; And (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates and alkyl acrylates; The total alkyl acrylate content is 20 to 50% by weight, and the butyl acrylate coverage value (X) calculated by Equation 1 below of the thermoplastic resin may provide a method for producing a thermoplastic resin, characterized in that 50 or more.

[Equation 1]

X = {(G-Y)/Y} * 100

(In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.)

The graft copolymer (A) preferably contains 25 to 50% by weight of an alkyl acrylate rubber having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm; and 100 parts by weight of a monomer mixture including 50 to 75% by weight of an alkyl acrylate compound and an alkyl methacrylate compound, and emulsion polymerization.

In addition, the present invention may provide a molded article comprising the thermoplastic resin.

The molded article may preferably be a finishing material.

According to the present invention, by controlling the particle size, rubber content, graft rate and molecular weight of the rubber contained in the resin and the gel content of the resin, the impact strength, weather resistance, gloss, colorability and fluidity are excellent at the same time, and whitening occurs even when bending or hitting There is an effect of providing a thermoplastic resin excellent in non-whitening properties and a manufacturing method thereof.

1 is a photograph taken after bending the films prepared in Examples (left photo) and Comparative Example (right photo) in Md and Td directions, respectively, to check whether whitening occurs.
2 is a photograph taken after hitting each of the films prepared in Examples (left photo) and Comparative Example (right photo) with a Gardner impact tester to check whether whitening occurs.

Hereinafter, the thermoplastic resin of the present substrate will be described in detail.

While the present inventors were researching ASA resin that can provide a finishing material with a luxurious appearance, when the distance between rubber particles is narrowed and the graft rate is increased to a predetermined range, the formation of voids due to crack generation is minimized, and the whitening property is greatly improved The present invention was completed by further concentrating on research based on this.

In the present description, the resin does not mean only a single (co)polymer, and may include two or more (co)polymers as a main component.

In the present description, the composition ratio of the (co)polymer may mean the content of the units constituting the (co)polymer, or the content of the units input during polymerization of the (co)polymer.

The thermoplastic resin of the present invention comprises (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% and the butyl acrylate coverage value (X) calculated by the following Equation 1 is 50 or more, and in this case, it is excellent in impact resistance, weather resistance and molding processability, and whitening does not occur due to bending or hitting, so no whitening It has excellent properties.

[Equation 1]

X = {(G-Y)/Y} * 100

In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.

In another example, the thermoplastic resin of the present invention may include (A) 50 to 100% by weight of an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) 0 to 50 wt% of a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates and alkyl acrylates; It is characterized in that the value of X is 50% or more, and in this case, it has excellent impact resistance, weather resistance, and molding processability, and has excellent non-whitening properties because whitening does not occur during bending.

[Equation 1]

X(%) = {(G-Y)/Y} * 100

In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.

In addition, the thermoplastic resin of the present invention may include (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% It is characterized in that the elution amount of butyl acrylate in acetone is 0.1% by weight or more, and in this case, it has excellent impact resistance, weather resistance, and molding processability, and does not cause whitening due to bending, so that it has excellent non-whitening properties.

In addition, the thermoplastic resin of the present invention may include (A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates; including, wherein the total alkyl acrylate content is 20 to 50 wt% And, the (A) copolymer is, based on the total weight of the (A) copolymer, (a-1) an alkyl acrylate rubber 25 having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm to 50% by weight; and (a-2) 50 to 75 wt% of an alkyl acrylate-alkyl methacrylate copolymer; in this case, impact resistance, weather resistance and molding processability are excellent, and whitening occurs due to bending It has the advantage of excellent non-whitening properties.

In this description, the gel content is determined by adding 30 g of acetone to 0.5 g of dry thermoplastic resin powder, stirring at 210 rpm at room temperature for 12 hours (SKC-6075, Lab companion), and centrifuging it (Supra R30, Hanil Science) After centrifugation at 0 ° C. at 18,000 rpm for 3 hours to collect insoluble fraction that did not dissolve in acetone, the weight was measured after drying (OF-12GW, Lab companion) at 85 ° C for 12 hours by forced circulation. It can be obtained by calculating by Equation 3 below.

[Equation 3]

Gel content (%) = {weight of insoluble matter (gel) / weight of sample} * 100

The graft rate of this substrate was obtained by adding 30 g of acetone to 0.5 g of the graft polymer dry powder, stirring at 210 rpm at room temperature for 12 hours (SKC-6075, Lab companion), and using a centrifuge (Supra R30, Hanil Science) After centrifugation at 0 ° C. at 18,000 rpm for 3 hours to collect insoluble fraction that was not dissolved in acetone, the weight was measured after drying (OF-12GW, Lab companion) at 85 ° C. for 12 hours by forced circulation. It can be obtained by calculating by Equation (4).

[Equation 4]

Graft rate (%) = [weight of grafted monomer (g) / rubber weight (g)] * 100

The weight (g) of the grafted monomer in Equation 4 is the weight obtained by dissolving the graft copolymer in acetone and centrifuging the obtained insoluble matter (gel) minus the rubber weight (g), and the rubber weight (g) ) is the weight of the theoretically added rubber component in the graft copolymer powder.

In the present description, the DLS average particle diameter can be measured using a dynamic light scattering method, and in detail, the intensity in the Gaussian mode using a particle size distribution analyzer (Nicomp CW380, PPS) in the latex state. (intensity) value can be measured. As a specific example, after preparing a sample by diluting 0.1 g of latex having a solid content of 35 to 50% by weight with 100 g of deionized water, using a particle size distribution analyzer (Nicomp CW380, PPS) at 23° C., the measurement method is Auto-dilution to measure with a flow cell, and the measurement mode can be obtained by dynamic light scattering method/Intensity 300KHz/Intensity-weight Gaussian Analysis.

In the present description, the TEM average particle diameter may be measured using a transmission electron microscope (TEM) analysis, and as a specific example, it means a value obtained by numerically measuring the particle size on a high magnification image of a TEM and arithmetic average. In this case, specific measurement examples are as follows:

- Sample preparation: thermoplastic resin pellets manufactured by extrusion kneader

- Sample pretreatment: Timing (23℃) → Hydrazine treatment (72℃, 5 days) → Sectioning (-120℃) → OsO ₄ vapor staining (2 hours)

- Analysis instrument: TEM (JEM-1400, Jeol company)

- Analysis conditions: Acc. Volt 120 kV, SPOT Size 1 (X 10K, X 25K, X 50K)

- Size (average particle diameter) measurement: the average of the longest diameters of particles with the top 10% in diameter size

Here, the average of the longest diameters of the particles whose diameter size is the top 10% means, for example, randomly selecting 100 or more particles from a TEM image and measuring their longest diameter, and then the arithmetic mean value of the top 10% of the measured diameter it means.

Hereinafter, each component constituting the thermoplastic resin of the present disclosure will be described in detail as follows.

(A) copolymer

The copolymer (A) is composed of an alkyl acrylate and an alkyl methacrylate, and is included in an amount of 50 to 100% by weight in 100% by weight of the total thermoplastic resin.

The (A) copolymer is, for example, (a-1) DLS average particle diameter of 40 to 120 nm or TEM average particle diameter of 25 to 100 nm, based on 100% by weight of the (A) copolymer, alkyl acrylate rubber 25 to 50 % by weight, preferably from 30 to 50% by weight, more preferably from 35 to 50% by weight, and (a-2) from 50 to 75% by weight of an alkyl acrylate-alkyl methacrylate copolymer, preferably from 50 to 70 % by weight, more preferably 50 to 65% by weight, and has excellent impact resistance while having excellent gloss and non-whitening properties within this range. The DLS average particle diameter of the (a-1) rubber is preferably 45 to 110 nm, more preferably 50 to 100 nm, and the TEM average particle diameter is preferably 27 to 95 nm, more preferably 30 to 100 nm. It may be 90 nm, and within this range, there is an effect excellent in colorability and weather resistance without a decrease in mechanical strength.

In the present description, the graft copolymer (A) comprising (a-1) an alkyl acrylate rubber, and (a-2) an alkyl acrylate-alkyl methacrylate copolymer is an alkyl acrylate rubber (a-1) ), and an alkyl acrylate-alkyl methacrylate copolymer (a-2) surrounding the alkyl acrylate rubber (a-1), which means a graft copolymer (A). Also, (a-1) may be expressed as a graft copolymer (A) in which an alkyl acrylate and an alkyl methacrylate are graft-polymerized on an alkyl acrylate rubber.

The copolymer (A) may have, for example, a graft rate of 60 to 200%, and the weight average molecular weight of the copolymer (a-2) may be, for example, 40,000 to 120,000 g/mol, and molding processability within this range. and excellent whitening properties. The graft ratio of the copolymer (A) is preferably 60 to 150%, more preferably 65 to 130%, Even more preferably, it may be 70 to 130%, and within this range, there is an excellent effect of non-whitening properties without deterioration of impact resistance and molding processability. The weight average molecular weight of the copolymer (a-2) may be preferably 40,000 to 110,000 g/mol, more preferably 50,000 to 100,000 g/mol, within this range, molding processability and non-whitening without lowering impact resistance. Characteristics have an excellent effect.

In this description, unless otherwise defined, the weight average molecular weight can be measured using GPC (Gel Permeation Chromatography, waters breeze). As a specific example, standard polystyrene (PS) through GPC using THF (tetrahydrofuran) as an eluent ) can be measured relative to the sample. At this time, as a specific example of measurement, solvent: THF, column temperature: 40°C, flow rate: 0.3ml/min, sample concentration: 20mg/ml, injection amount: 5μl, column model: 1xPLgel 10㎛ MiniMix-B (250x4.6mm) + 1xPLgel 10㎛ MiniMix-B (250x4.6mm) + 1xPLgel 10㎛ MiniMix-B Guard (50x4.6mm), equipment name: Agilent 1200 series system, Refractive index detector: Agilent G1362 RID, RI temperature: 35℃, data processing: Agilent ChemStation S/W, test method (Mn, Mw and PDI): It can be measured under the conditions of OECD TG 118.

The (a-1) rubber may have, for example, a glass transition temperature of -50 to -20°C, preferably -48 to -21°C, and within this range, the impact strength is higher without deterioration of other physical properties. It has an excellent effect.

In the present substrate, the glass transition temperature can be measured using TA Instruments Q100 Differential Scanning Calorimetry (DSC) according to ASTM D 3418 at a temperature increase rate of 10° C./min.

The (A) copolymer has, for example, a graft frequency (%) calculated by the following formula (2) of 0.05 to 0.375%, preferably 0.065 to 0.30%, more preferably 0.070 to 0.20%, even more preferably 0.075 to 0.125%, and within this range, the (a-1) rubber is evenly surrounded by the (a-2) copolymer, so that the whitening property is more excellent.

[Equation 2]

Graft frequency (%) = [Graft rate / {weight average molecular weight of parts excluding rubber}] * 100

In Equation 2, the graft rate is the graft rate of the (A) copolymer, and the portion excluding the rubber is the portion excluding (a-1) rubber included in the (A) copolymer (a-2) copolymer points to

The (a-1) rubber may further include, for example, alkyl methacrylate, and in this case, chemical resistance and impact resistance are more excellent. The content of the alkyl methacrylate contained in the (a-1) rubber is, for example, 0.01 to 25% by weight, preferably 0.1 to 25% by weight, more preferably based on 100% by weight of the (a-1) rubber. Preferably, it may be 1 to 20% by weight, more preferably 2 to 15% by weight, and within this range, the desired effect can be sufficiently obtained without lowering other physical properties.

The alkyl acrylate rubber can be prepared by emulsion polymerization of an alkyl acrylate-based compound, for example, and as a specific example, it can be prepared by emulsion polymerization by mixing an acrylate-based compound, an emulsifier, an initiator, a grafting agent, a crosslinking agent, an electrolyte, and a solvent. In this case, the grafting efficiency is excellent and there is an effect of excellent physical properties such as impact resistance.

The copolymer (a-2) may include, for example, 80 to 99.9% by weight of an alkyl methacrylate and 0.1 to 20% by weight of an alkyl acrylate based on 100% by weight of the (a-2) copolymer. and preferably comprising 85 to 99.5 wt% of an alkyl methacrylate and 0.5 to 15 wt% of an alkyl acrylate, more preferably 85 to 99 wt% of an alkyl methacrylate and 1 to 15 wt% of an alkyl acrylate may be, and within this range, impact strength and weather resistance are more excellent.

The (a-1) rubber may include, for example, a rubber seed.

The rubber seed may be prepared by, for example, polymerizing an alkyl acrylate and optionally an alkyl methacrylate, and in the case of including an alkyl methacrylate, 1 to 20% by weight, preferably 2 to 20% by weight, based on 100% by weight of the rubber seed 15% by weight, more preferably 5 to 15% by weight can be prepared by polymerization, and within this range, there is an excellent effect in impact strength, weather resistance, balance of physical properties, and the like.

As a specific example, the rubber seed is polymerized by including 0.01 to 3 parts by weight of a crosslinking agent, 0.01 to 3 parts by weight of an initiator, and 0.01 to 5 parts by weight of an emulsifier to 100 parts by weight of the unit constituting the copolymer (A) in the alkyl acrylate. It is possible to manufacture a polymer with an even size within a short time within the above range, and further improve physical properties such as weather resistance and impact strength.

As another specific example, the rubber seed is a monomer comprising an alkyl acrylate and an alkyl methacrylate, 0.1 to 1 part by weight of a crosslinking agent, 0.01 to 1 part by weight of an initiator, based on 100 parts by weight of the unit constituting the copolymer (A) And it can be prepared by polymerization including 0.1 to 3.0 parts by weight of an emulsifier, and a polymer having an even size can be prepared within a short time within the above range, and physical properties such as weather resistance and impact strength can be further improved.

The (A) copolymer is, for example, based on 100 parts by weight of the unit constituting the (A) copolymer, A-1) 0.001 to 1 part by weight of an alkyl acrylate and optionally 1 to 15 parts by weight of an alkyl methacrylate. preparing a rubber seed by polymerizing a mixture containing parts, 0.01 to 5 parts by weight of a crosslinking agent, 0.01 to 3 parts by weight of an initiator, and 0.01 to 5 parts by weight of an emulsifier; A-2) A mixture comprising 20 to 50 parts by weight of an alkyl acrylate and optionally an alkyl methacrylate, 0.01 to 1 parts by weight of a crosslinking agent, 0.01 to 3 parts by weight of an initiator, and 0.01 to 5 parts by weight of an emulsifier in the presence of the rubber seed polymerizing to prepare a rubber core; and A-3) 0.01 to 3 parts by weight of a crosslinking agent, 0.01 to 3 parts by weight of an initiator, 0.1 to 2 parts by weight of an emulsifier, and 0.01 to 2 parts by weight of an activator in 40 to 75 parts by weight of an alkyl acrylate and an alkyl methacrylate in the presence of the rubber core. It may be prepared including; preparing a graft shell by mixing 1 part by weight. In this case, there is an excellent effect in the balance of physical properties of impact resistance, weather resistance, molding processability and non-whitening properties.

In the present description, the alkyl acrylate compound may be, for example, an alkyl acrylate having 1 to 15 carbon atoms in the alkyl group, and specific examples thereof include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylbutyl acrylate, It may be at least one selected from the group consisting of octyl acrylate, 2-ethylhexyl acrylate, hexyl acrylate, heptyl acrylate, n-pentyl acrylate, and lauryl acrylate, and preferably a chain alkyl group having 1 to 4 carbon atoms. It may be an alkyl acrylate containing, and more preferably, butyl acrylate.

In the present description, the alkyl methacrylate may be, for example, an alkyl methacrylate having 1 to 15 carbon atoms in the alkyl group, and specific examples thereof include methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylbutyl methacrylate. , may be at least one selected from the group consisting of 2-ethylhexyl methacrylate and lauryl methacrylate, preferably an alkyl methacrylate containing a chain alkyl group having 1 to 4 carbon atoms, more preferably methyl methacrylate.

In the present description, the crosslinking agent is not particularly limited if it is a crosslinking agent generally used in the technical field to which the present invention belongs, unless otherwise defined. For example, a compound that includes an unsaturated vinyl group and can serve as a crosslinking agent or two or more different reactivity At least one compound containing an unsaturated vinyl group having , Ethylene glycol dimethacrylate, divinylbenzene, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 1,3-butadiol dimethacrylate, hexanediol propoxylate diacrylate, neopentyl glycol dimethacrylate, neopentyl glycol ethoxylate diacrylate, neopentyl glycol propoxylate diacrylate, trimethylolpropane trimethacrylate, trimethylolmethane triacrylate, trimethylpropaneethoxylate triacrylate, Trimethylpropanepropoxylate triacrylate, pentaerythritol ethoxylate triacrylate, pentaerythritol propoxylate triacrylate, vinyltrimethoxysilane, allyl methacrylate, triallyl isocyanurate, triallyl amine And it may be at least one selected from the group consisting of diallyl amine, but is not limited thereto.

In the present substrate, the electrolyte is, for example, KCl, NaCl, KHCO ₃ , NaHCO ₃ , K ₂ CO ₃ , Na ₂ CO ₃ , KHSO ₃ , NaHSO ₃ , K ₄ P ₂ O ₇ , Na ₄ P ₂ O ₇ , K ₃ PO ₄ , Na ₃ PO ₄ , K ₂ HPO ₄ , Na ₂ HPO ₄ , KOH, NaOH and Na ₂ S ₂ O ₇ One or a mixture of two or more selected from the group consisting of may be used, but not limited thereto specify

As the initiator in the present description, if it is an initiator generally used in the technical field to which the present invention belongs, it may be used without particular limitation, for example, a radical initiator such as a water-soluble initiator and a fat-soluble initiator may be used, and these initiators are one or two More than one species can be mixed and used.

As the water-soluble initiator, at least one selected from the group consisting of inorganic peroxides such as sodium persulfate, potassium persulfate, ammonium persulfate, potassium perphosphate, and hydrogen peroxide, but not limited thereto.

As the fat-soluble initiator, at least one selected from the group consisting of dialkyl peroxide, diacyl peroxide, diperoxyketal, hydroperoxide, peroxyester, peroxydicarbonate, azo compound, and the like may be used.

As a more specific example, cumene hydroperoxide, p-mentane hydroperoxide, di-t-butyl peroxide, dicumyl peroxide, t-butylcumyl peroxide, di-t-amyl peroxide, 2,5-di Methyl-2,5-di(t-butylperoxy)-hexane, 1,1,-di(t-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-di(t-butyl Peroxy)-cyclohexane, 1,1-di(t-amylperoxy)-cyclohexane, ethyl 3,3-di(t-amylperoxy)-butyrate, diisopropylbenzene mono-hydroperoxide, t -amyl hydroperoxide, t-butyl hydroperoxide, t-butyl peroxyneodecanoate, t-butyl peroxypivalate, di-(3,5,5-trimethylhexanoyl)-peroxide, t- Butyl peroxy-2-ethylhexanoate, t-butyl peroxy-3,5,5-trimethylhexanoate, t-amyl peroxy neodecanoate, t-amyl peroxy pivalate, t-amyl per Oxy-2-ethylhexanoate, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-amyl peroxy 2-ethylhexyl carbonate, t-butyl peroxy 2-ethylhexyl carbonate, t-butyl peroxy Oxyisopropyl monocarbonate, t-butyl peroxy maleic acid, cumyl peroxyneodecanoate, 1,1,3,3,-tetramethylbutyl peroxy neodecanoate, 1,1,3,3,- Tetramethylbutyl peroxy 2-ethylhexanoate, di-2-ethylhexyl peroxydicarbonate, 3-hydroxy-1,1-dimethylbutylperoxy neodecanoate, acetyl peroxide, isobutyl peroxide, octa organic peroxides such as noyl peroxide, dibenzoyl peroxide, dilauroyl peroxide, 3,5,5-trimethylhexanoyl peroxide, and t-butyl peroxy isobutylate; azobis isobutyronitrile, azobismethylbutyronitrile, azobis-4-methoxy-2,4-dimethylvaleronitrile, azobis-2,4-dimethylvaleronitrile, azobiscyclohexanecarbonitrile, At least one selected from the group consisting of azobis isobutyric acid (butyric acid) methyl may be used, but the present invention is not limited thereto.

In the manufacturing stage of the rubber seed, the manufacturing stage of the rubber core, and the manufacturing stage of the copolymer shell (graft shell), an oxidation-reduction catalyst may be optionally further used to further promote the initiation reaction together with the initiator, The oxidation-reduction catalyst is, for example, from the group consisting of sodium pyrophosphate, dextrose, ferrous sulfide, sodium sulfite, sodium formaldehyde sulfoxylate, sodium ethylenediamine tetraacetate, sulfonatoacetic acid metal salt and sulfinatoacetic acid metal salt. One or more selected types may be used, but the present invention is not limited thereto.

Preferably, an activator is used to promote the initiation reaction of the peroxide together with the polymerization initiator in at least one of the steps of producing the rubber seed, producing the rubber core, and producing the copolymer shell (graft shell). can, The activator is selected from the group consisting of sodium formaldehyde, sulfoxylate, sodium ethylenediamine, tetraacetate, ferrous sulfate, dextrose, sodium pyrrolate, sodium sulfite, sulfonatoacetic acid metal salt and sulfinatoacetic acid metal salt It is preferred to use a species or two or more species.

The activator may be added in an amount of 0.01 to 3 parts by weight, or 0.01 to 1 parts by weight, based on 100 parts by weight of the total of the monomers added during the preparation of the copolymer (A), and a high degree of polymerization can be achieved within this range. there is an advantage

In the step of preparing the seed and the core, batch input and continuous input may be used individually or a combination of the two methods may be used as the input method of the monomer.

In the present description, 'continuous input' means not 'batch input', for example, 10 minutes or more, 30 minutes or more, 1 hour or more, preferably 2 hours or more drop-by-drop within the polymerization reaction time range. by drop), little by little, step by step, or continuous flow.

In the present description, the emulsifier is not particularly limited if it is an emulsifier generally used in the art to which the present invention belongs, and for example, rosin acid salt, lauryl acid salt, oleic acid salt, stearic acid salt, etc. containing 20 carbon atoms or less or 10 to 20 low molecular weight carboxylates; an alkyl sulfosuccinic acid salt or derivative thereof having 20 or less or 10 to 20 carbon atoms; alkyl sulfates or sulfonates having up to 20 carbon atoms or from 10 to 20 carbon atoms; a polyfunctional carboxylic acid having 20 to 60, 20 to 55, or 30 to 55 carbon atoms and at least 2 or more, preferably 2 to 3 carboxyl groups in the structure, or a salt thereof; and at least one phosphoric acid-based salt selected from the group consisting of mono alkyl ether phosphate or dialkyl ether phosphate; it may be at least one selected from the group consisting of.

In another example, the emulsifier is sulfoethyl methacrylate, 2-acrylamido-2-methylpropane sulfonic acid, sodium styrene sulfonate, Sodium dodecyl allyl sulfosuccinate, styrene and sodium dodecyl allyl sulfosuccinate copolymer, polyoxyethylene alkylphenyl ether ammonium sulfates (polyoxyethylene alkylphenyl ether ammonium etc.), alkenyl C16 -18 Reactive emulsifier selected from succinic acid, di-potassium salt (alkenyl C16-18 succinic acid, di-potassium salt) and sodium methallyl sulfonate; and a non-reactive emulsifier selected from the group consisting of alkyl aryl sulfonates, alkali methyl alkyl sulfates, sulfonated alkyl esters, soaps of fatty acids, and alkali salts of rosin acids.

As another example, the emulsifier may be a derivative of a C12 to C18 alkyl sulfosuccinate metal salt, a C12 to C20 alkyl sulfate ester or a derivative of a sulfonic acid metal salt. Examples of the derivative of the C12 to C18 alkyl sulfosuccinate metal salt include sodium or potassium salts of dicyclohexyl sulfonate, dihexyl sulfosuccinate, and dioctyl sulfosuccinate, and C12 to C20 sulfuric acid esters. Alternatively, the sulfonic acid metal salt may be an alkyl sulfate metal salt such as sodium lauric sulfate, sodium dodecyl sulfate, sodium dodecyl benzene sulfate, sodium octadecyl sulfate, sodium oleic sulfate, potassium dodecyl sulfate, or potassium octadecyl sulfate. do. The emulsifier may be used alone or in combination of two or more.

In the present description, a derivative of a certain compound means a substance in which at least one of hydrogen and a functional group of the compound is substituted with another group such as an alkyl group or a halogen group.

In the present disclosure, when preparing the copolymer (A) in the present disclosure, it may optionally further include a molecular weight modifier for emulsion polymerization, and the molecular weight modifier may be 0.01 to 2 parts by weight based on 100 parts by weight of the unit constituting the copolymer (A). , 0.05 to 2 parts by weight or 0.05 to 1 part by weight, and a polymer having a desired molecular weight within this range can be easily prepared.

The molecular weight modifier may include, for example, mercaptans such as α-methylstyrene dimer, t-dodecyl mercaptan, n-dodecyl mercaptan, and octyl mercaptan; halogenated hydrocarbons such as carbon tetrachloride, methylene chloride and methylene bromide; and sulfur-containing compounds such as tetraethyl thiuram disulfide, dipentamethylene thiuram disulfide, and diisopropylxanthogen disulfide; may be at least one selected from the group consisting of, preferably tertiary dodecylmercaptan, etc. may be used, but is not limited thereto.

The polymerization temperature during the emulsion polymerization is not particularly limited, but in general, polymerization may be carried out at 50 to 85°C, preferably at 60 to 80°C.

(A) copolymer latex prepared through the above step may be characterized in that, for example, the coagulant content is 1% or less, preferably 0.5% or less, and more preferably 0.1% or less. Within the above-described range, the resin has excellent productivity, and mechanical strength and appearance characteristics are improved.

In the present description, the coagulant content (%) can be calculated by measuring the weight of the coagulated material produced in the reaction tank, the total rubber weight, and the weight of the monomer, and the following Equation 5.

[Equation 5]

The latex of the copolymer (A) may be in powder form through conventional processes such as agglomeration, washing, and drying, for example, and as a specific example, aggregation at a temperature of 60 to 100° C. by adding a metal salt or acid, and aging , may be prepared in powder form through dehydration, washing and drying processes, but is not limited thereto.

Other conditions not specified in the method for preparing the copolymer (A) described above, that is, polymerization conversion, reaction pressure, reaction time, gel content, etc., are not particularly limited as long as they are within the range commonly used in the art to which the present invention pertains. , specify that it can be appropriately selected and implemented according to need.

In the present description, % means % by weight unless otherwise defined.

(B) matrix resin

The thermoplastic resin of the present invention is a matrix resin comprising at least one selected from the group consisting of an aromatic vinyl compound, a vinyl cyan compound, an alkyl methacrylate, and an alkyl acrylate based on 100% by weight of the total weight of the thermoplastic resin. % included. When the (B) matrix resin is included in the thermoplastic resin, there is an advantage that mechanical properties and molding processability can be further improved.

The (B) matrix resin is a hard matrix melt-kneaded with the dry powder (DP) of the copolymer (A), and includes a hard polymer-forming monomer having a glass transition temperature of at least 60°C. Specifically, it is preferable to prepare a compound including an aromatic vinyl compound, a vinyl cyan compound, methyl methacrylate and an alkyl acrylate or a unit derived therefrom, alone or by mixing two or more thereof. The glass transition temperature of the (B) matrix resin may be preferably 80 to 160° C., more preferably 90 to 150° C., and molding processability may be further improved within this range.

The (B) matrix resin is, for example, an aromatic vinyl compound-vinyl cyan compound copolymer, an aromatic vinyl compound-vinyl cyan compound-alkyl methacrylate copolymer, an alkyl methacrylate polymer, and an alkyl methacrylate-alkyl acrylate copolymer. It may include one or more selected from the group consisting of, and may further include an aromatic vinyl compound-vinyl cyan compound-alkyl acrylate copolymer. have.

The alkyl methacrylate-alkyl acrylate copolymer that may be included in the matrix resin (B) is different from the graft copolymer (A).

The aromatic vinyl compound included in the matrix resin is, for example, styrene, α-methyl styrene, ο-methyl styrene, ρ-methyl styrene, m-methyl styrene, ethyl styrene, isobutyl styrene, t-butyl styrene, ο-brovo It may be at least one selected from the group consisting of styrene, ρ-bromo styrene, m-bromo styrene, ο-chloro styrene, ρ-chloro styrene, m-chloro styrene, vinyltoluene, vinylxylene, fluorostyrene, and vinylnaphthalene and preferably at least one selected from the group consisting of styrene and α-methyl styrene, in which case fluidity is appropriate, so that processability is excellent and mechanical properties such as impact resistance are excellent.

The vinyl cyan compound included in the matrix resin may be, for example, at least one selected from the group consisting of acrylonitrile, methylacrylonitrile, ethylacrylonitrile and isopropylacrylonitrile, preferably acrylonitrile have.

The alkyl methacrylate and the alkyl acrylate contained in the matrix resin may be appropriately selected within the same range as those mentioned for the copolymer (A), respectively.

The alkyl methacrylate contained in the matrix resin may be preferably methyl methacrylate.

The alkyl acrylate included in the matrix resin may be preferably at least one selected from the group consisting of methyl acrylate and ethyl acrylate.

The (B) matrix resin may be prepared by adopting a generally known method, and if necessary, may include one or more from an initiator, a crosslinking agent and a molecular weight regulator, etc., and may include suspension polymerization, emulsion polymerization, bulk polymerization, or solution. It can be prepared by a polymerization method.

Materials necessary for the reaction, such as solvents and emulsifiers, or conditions such as polymerization temperature and polymerization time, which must be added or changed according to the polymerization method, are generally applicable materials or conditions depending on the polymerization method selected when preparing each matrix resin. It does not restrict|limit especially, According to necessity, it can select suitably.

As another example, as the matrix resin (B), a commercially available product may be used.

thermoplastic resin

The thermoplastic resin of the present invention may include (A) 50 to 100% by weight of the copolymer and (B) 0 to 50% by weight of the matrix resin, based on 100% by weight of the total of the thermoplastic resin, preferably (A) air 60 to 100% by weight of the copolymer and (B) 0 to 40% by weight of the matrix resin, more preferably (A) 60 to 90% by weight of the copolymer and (B) 10 to 40% by weight of the matrix resin, Within the range, it has excellent impact resistance, fluidity and non-whitening properties.

The total amount of alkyl acrylate contained in the total 100 wt% of the thermoplastic resin The content is 20 to 50% by weight, preferably 22 to 50% by weight, more preferably 25 to 50% by weight, within this range there is an excellent effect of impact strength and whitening properties without deterioration of weather resistance .

In the present description, the total content of the alkyl acrylate contained in the total 100% by weight of the thermoplastic resin means the total sum of the weight of the alkyl acrylate compound contained in each of the (A) copolymer and (B) the matrix resin, For example, it can be calculated by adding parts by weight of the alkyl acrylate compound added during the production of the thermoplastic resin. In another example, the thermoplastic resin may be quantitatively measured through NMR (Nuclear Magnetic Resonance) analysis or FT-IR (Fourier Transform Infrared Spectroscopy) analysis.

In the present description, NMR analysis means analysis by ^{1 H NMR unless otherwise specified.}

In the present description, NMR analysis may be measured using a method commonly performed in the art, and specific measurement examples are as follows.

- Equipment name: Bruker 600MHz NMR(AVANCE III HD) CPP BB(1H 19F tunable and broadband, with z-gradient) Prodigy Probe

- Measurement conditions: ¹ H NMR (zg30): ns=32, d1=5s, TCE-d2, at room temp.

In the present description, FT-IR analysis may be measured using a method commonly performed in the art, and specific measurement examples are as follows.

- Equipment name: Agilent Cary 660

- Measurement condition: ATR mode

The thermoplastic resin may have a butyl acrylate coverage value (X) of 50% or more, preferably 50 to 250%, more preferably 55 to 200%, calculated by Equation 1 through the limited composition as described above, Within this range, there is a more excellent effect of non-whitening properties.

[Equation 1]

X(%) = {(G-Y)/Y} * 100

In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the content (% by weight) of butyl acrylate in the gel of the thermoplastic resin.

In Equation 1, the content of butyl acrylate in the gel of the thermoplastic resin represents the content of butyl acrylate in the insoluble matter (gel) collected in the process of obtaining the above-described gel content (based on 100% by weight of the total injected thermoplastic resin) . Here, the gel content represents the content of insoluble matter (wt%) based on 100 wt% of the total thermoplastic resin.

The thermoplastic resin may include one or two or more kinds of alkyl acrylate compounds, and among them, the difference between the total gel content with respect to the content in the gel of butyl acrylate contained in the thermoplastic resin and the content in the gel of butyl acrylate By limiting to a specific range, it is possible to provide a thermoplastic resin excellent in non-whitening properties as well as mechanical properties such as impact resistance, molding processability, and gloss.

The thermoplastic resin preferably has an elution amount of butyl acrylate in acetone of 0.01 wt% or more, more preferably 0.1 wt% or more, preferably 0.1 to 15 wt%, and more preferably 0.5 to 15 wt% % by weight, and has an excellent effect of non-whitening properties within this range.

In this description, the elution amount of alkyl acrylate under acetone is determined by adding 30 g of acetone to 0.5 g of dry thermoplastic resin powder, stirring at 210 rpm at room temperature for 12 hours (SKC-6075, Lab companion), and then centrifuging (Supra) R30, Hanil Science Co., Ltd.), the acetone solution from which the insoluble content was separated by centrifugation at 0° C. at 18,000 rpm for 3 hours was dried at 85° C. for 12 hours by forced circulation (OF-12GW, Lab companion) to obtain a resin sol ( Sol), which can be quantitatively measured by NMR analysis or FT-IR analysis.

The glass transition temperature of the thermoplastic resin, the (a-1) rubber, or both may be, for example, -50 to -20°C, preferably -48 to -21°C, and other physical properties within this range There is an effect that the impact strength is more excellent without lowering the

The thermoplastic resin of the present invention is excellent in whitening resistance against bending such as bending or folding, for example, the thermoplastic resin is extruded into a film having a width and length of 100 mm x 100 mm and a thickness of 0.15 mm to 180 ° under a temperature of 23 ° C. Whitening does not occur when bent, and it is characterized by excellent non-whitening properties.

In addition, the thermoplastic resin of the present invention is excellent in whitening resistance against external impact (strike). For example, the thermoplastic resin is extruded into a film having a thickness of 0.15 mm, and the weight is 1 kg using a Gardner impact tester under a temperature of 23 ° C. When the weight of the weight is dropped vertically onto the film from a height of 100 mm, the difference in haze value measured according to ASTM D1003-95 before and after the impact of the part hit by the weight is 10 or less, preferably 5 or less, More preferably, it may be 3 or less. In this case, the occurrence of whitening due to bending or external impact is greatly reduced, and the inherent color due to whitening is inhibited, making it difficult to express the desired color, and it prevents the problem of poor quality due to uneven appearance and excellent appearance quality. It has the effect of providing a molded article.

In this description, the difference in haze before and after impact is specifically measured by using BYK Gardner's Impact Tester 5545 as a Gardner impact tester for a film specimen having a width and length of 100 mm x 100 mm and a thickness of 0.15 mm, and Cat No. The middle of the film is impacted using 1249 (falling weight 1 kg), and the haze of the middle portion of the film before and after impact is measured and obtained from the difference.

In the present description, haze may be measured using a method known in the related art for measuring transparency, and in detail, it may be measured according to ASTM D1003. As a specific example, according to ASTM D1003 for a film specimen extruded at an extrusion temperature of 230 ° C using a haze meter (model name: HM-150) equipment of MURAKAMI, haze can be measured at a temperature of 23 ° C.

The thermoplastic resin may have a gloss of 100 or more, preferably 100 to 150, more preferably 105 to 145, even more preferably 108 to 145, measured at an incident angle of 60° according to ASTM D528, for example, Within this range, it is possible to provide a molded article having excellent appearance quality due to excellent gloss without deterioration of other physical properties.

The thermoplastic resin has, for example, a melt flow index (MI) of 5 g/10 min or more, preferably 5 to 25 g/10 min, more preferably 5 to 20 g/ 10 min, even more preferably It may be 5.5 to 20 g/10 min, and within this range, there is an excellent effect of molding processability without deterioration of other physical properties.

In the present description, the flow index can be measured at 220° C. with a weight of 10 kg and a reference time of 10 minutes, and the melt index can be measured according to ASTM D1238. As a specific example, using GOETTFERT's melting index measuring equipment, the specimen is heated to a temperature of 220°C, placed in a cylinder of a melt indexer, a load of 10 kg is applied with a piston, and melted for 10 minutes. It can be obtained by measuring the weight (g) of the resin.

Method for producing thermoplastic resin

The method for producing the thermoplastic resin of the present invention comprises (A) 50 to 100 parts by weight of an alkyl acrylate-alkyl methacrylate graft copolymer and (B) an aromatic vinyl compound, a vinyl cyan compound, an alkyl methacrylate and an alkyl acrylate. Including 0 to 50 parts by weight of a matrix resin comprising at least one selected from the group consisting of, kneading and extruding, wherein the X value calculated by the following Equation 1 is It is characterized in that it is 50% or more, and in this case, it is possible to provide excellent appearance quality due to excellent molding processability while maintaining the mechanical properties of the conventional ASA-based resin, and excellent gloss and whitening properties.

[Equation 1]

X(%) = {(G-Y)/Y} * 100

In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the content (weight %) of butyl acrylate in the gel of the thermoplastic resin.

The copolymer (A) used in the preparation of the thermoplastic resin may be prepared by the method for preparing the copolymer (A). In this case, the graft rate, graft frequency, and molecular weight are appropriately controlled to form processability and non-whitening properties. This has excellent advantages.

When manufacturing the thermoplastic resin of the present invention, optionally a lubricant, a heat stabilizer, a light stabilizer, an antioxidant, an ultraviolet stabilizer, a dye, a pigment, a colorant, a mold release agent, an antistatic agent, an antibacterial agent, a processing aid, a compatibilizer, if necessary during the kneading and extrusion process , metal deactivator, flame retardant, flame retardant, anti-drip agent, foaming agent, plasticizer, reinforcing agent, filler, matte agent, at least one selected from the group consisting of anti-friction agent and anti-wear agent (A) copolymer and (B) matrix resin It may further include 0.01 to 5 parts by weight, 0.05 to 3 parts by weight, 0.05 to 2 parts by weight, or 0.05 to 1 parts by weight based on 100 parts by weight of the total, and within this range, the physical properties of the ASA-based resin are not reduced. There is an effect that the necessary physical properties are well realized without any effort.

The lubricant may be, for example, at least one selected from ethylene bis steramide, polyethylene oxide wax, magnesium stearate, calcium steramide, and stearic acid, but is not limited thereto.

The antioxidant may include, for example, a phenol-based antioxidant, a phosphorus-based antioxidant, and the like, but is not limited thereto.

The light stabilizer may include, for example, a Hals light stabilizer, a benzophenone light stabilizer, a benzotriazole light stabilizer, and the like, but is not limited thereto.

The antistatic agent may include, for example, one or more anionic surfactants, non-ionic surfactants, and the like, but is not limited thereto.

The release agent may be used, for example, at least one selected from glycerin sterate, polyethylene tetra sterate, and the like, but is not limited thereto.

molded product

The molded article of the present invention is characterized in that it contains the thermoplastic resin excellent in the non-whitening properties of the present invention. In this case, it can be applied to film or sheet products because it can provide excellent appearance quality due to excellent weather resistance and impact resistance, excellent molding processability, and excellent gloss and whitening resistance at the same time.

The molded article may be, for example, a finishing material, and in this case, there is an advantage in that the appearance quality is excellent due to excellent whitening properties.

Hereinafter, preferred examples are presented to help the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it will be apparent to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention, It goes without saying that such changes and modifications fall within the scope of the appended claims.

[Example]

Example 1

<Step of manufacturing rubber seed>

In a nitrogen-substituted reactor, 30 parts by weight of distilled water, 5 parts by weight of butyl acrylate, 1.0 parts by weight of sodium dodecyl sulfate, 0.1 parts by weight of ethylene glycol dimethacrylate, 0.1 parts by weight of allyl methacrylate, 0.1 parts by weight of sodium hydrogen carbonate and After administering 60 parts by weight of distilled water at a time and raising the temperature to 70° C., 0.1 parts by weight of potassium persulfate was added to initiate the reaction. After that, polymerization was carried out for 1 hour.

<Rubber core manufacturing step>

35 parts by weight of butyl acrylate, 0.5 parts by weight of sodium dodecyl sulfate, 0.5 parts by weight of ethylene glycol dimethacrylate, 0.8 parts by weight of allyl methacrylate, 40 parts by weight of distilled water and 0.1 parts by weight of potassium persulfate mixed with the rubber seed The mixture was continuously added at 70° C. for 2.0 hours, and polymerization was further carried out for 1 hour after the addition was completed. The average size of the particles of the rubber polymer obtained after completion of the reaction was 80 nm.

<Copolymer shell manufacturing step>

Into the reactor in which the rubber core was obtained, 40 parts by weight of distilled water, 57 parts by weight of methyl methacrylate, 3 parts by weight of butyl acrylate, 1.0 parts by weight of sodium dodecylbenzene sulfonate and 0.05 parts by weight of tertiary dodecyl mercaptan and an initiator were used. A mixture of 0.1 parts by weight of t-butyl hydroperoxide, 0.015 parts by weight of the activator sodium ethylenediaminetetraacetate, 0.1 parts by weight of sodium formaldehyde sulfoxylate, and 0.002 parts by weight of ferrous sulfide were mixed at a temperature of 75° C. of 3.0 The polymerization reaction was carried out while continuously inputting for a period of time. After the continuous input was completed, polymerization was further carried out at 75° C. for 1 hour, and then the polymerization reaction was terminated by cooling to 60° C. to prepare a graft copolymer latex.

The graft copolymer obtained after completion of the reaction had a graft rate of 85%, a weight average molecular weight of the shell of 71,000 (g/mol), and a graft frequency of 0.12%.

<Preparation of graft copolymer powder>

The acrylate graft copolymer latex prepared above was subjected to atmospheric coagulation at 60 to 85°C by applying 1.0 parts by weight of an aqueous calcium chloride solution, then aged at 70 to 95°C, dehydrated and washed, and dried with hot air at 85°C for 2 hours. After the graft copolymer powder was prepared.

<Production of thermoplastic resin>

70 parts by weight of the graft copolymer powder, 30 parts by weight of methyl methacrylate (BA611, manufactured by LGMMA) as a matrix resin, 1.5 parts by weight of a lubricant, 1.0 parts by weight of an antioxidant, and 1.5 parts by weight of a UV stabilizer were added and mixed. When preparing the specimen for color evaluation and weather resistance evaluation, 1 part by weight of black colorant was additionally added to 100 parts by weight of the total of the graft copolymer and the matrix resin and mixed. This was prepared into pellets using a 36-pi extrusion kneader at a cylinder temperature of 220 °C. The prepared pellets were injected using an injection machine at a barrel temperature of 220° C. to prepare a specimen with physical properties such as impact strength.

The BA (butyl acrylate) content in the prepared thermoplastic resin is 30.1% (wt%), the glass transition temperature of the rubber is -47°C, the BA coverage value is 77.5%, and the BA elution amount in the resin sol is 1.89 % was.

<Production of thermoplastic resin film>

The thermoplastic resin pellets were prepared to a film thickness of 150 μm using a 20 pie single extrusion kneader equipped with a T-die at a cylinder temperature of 230° C.

Example 2

In Example 1, 25 parts by weight of butyl acrylate was used in the preparation of the rubber core, and 66.5 parts by weight of methyl methacrylate and 3.5 parts by weight of butyl acrylate were used in the preparation of the copolymer shell.

The graft copolymer obtained had a graft rate of 130%, a weight average molecular weight of the shell of 62,000, and a graft frequency of 0.21%.

The BA content in the prepared thermoplastic resin is 23.5%, the BA coverage value is 116%, and the BA elution amount in the resin Sol is 2.1%.

Example 3

In Example 1, it was prepared in the same manner except that 30 parts by weight of butyl acrylate was used in the preparation of the rubber core, and 61.8 parts by weight of methyl methacrylate and 3.2 parts by weight of butyl acrylate were used in the preparation of the copolymer shell.

The graft copolymer obtained had a graft rate of 98%, a weight average molecular weight of the shell of 54,000, and a graft frequency of 0.18%.

The BA content in the prepared thermoplastic resin is 26.8%, the BA coverage value is 88.8%, and the BA elution amount in the resin Sol is 2.09%.

Example 4

In Example 1, 45 parts by weight of butyl acrylate were used in the preparation of the rubber core, and 47.5 parts by weight of methyl methacrylate and 2.5 parts by weight of butyl acrylate were used in the preparation of the copolymer shell.

The graft copolymer obtained had a graft rate of 62%, a weight average molecular weight of the shell of 79,000, and a graft frequency of 0.078%.

The BA content in the prepared thermoplastic resin is 36.8%, the alkyl acrylate coverage value is 57.1%, and the BA elution amount in the resin Sol is 1.54%.

Example 5

It was prepared in the same manner as in Example 1, except that 2.0 parts by weight of sodium dodecyl sulfate was used when preparing the rubber seed.

The average size of the particles of the obtained rubber polymer was 50 nm, the grafting rate of the graft copolymer was 79%, the weight average molecular weight of the shell was 50,000, and the grafting frequency was 0.158%.

The BA content in the prepared thermoplastic resin is 30.1%, the BA coverage value is 72.2%, and the BA elution amount in the resin Sol is 1.99%.

Example 6

It was prepared in the same manner as in Example 1, except that 0.4 parts by weight of sodium dodecyl sulfate was used in the preparation of the rubber seed.

The average size of the particles of the obtained rubber polymer was 100 nm, the grafting rate of the graft copolymer was 89%, the weight average molecular weight of the shell was 80,000, and the grafting frequency was 0.111%.

The BA content in the prepared thermoplastic resin is 30.1%, the BA coverage value is 80.9%, and the BA elution amount in the resin Sol is 1.81%.

Example 7

It was prepared in the same manner as in Example 1, except that 0.3 parts by weight of sodium dodecyl sulfate was used in the preparation of the rubber seed.

The average size of the particles of the obtained rubber polymer was 110 nm, the grafting rate of the graft copolymer was 92%, the weight average molecular weight of the shell was 100,000, and the grafting frequency was 0.092%.

The BA content in the prepared thermoplastic resin is 30.1%, the BA coverage value is 83.6%, and the BA elution amount in the resin Sol is 1.76%.

Example 8

In Example 1, 33.25 parts by weight of butyl acrylate and 1.75 parts by weight of methyl methacrylate were used to prepare the rubber core, and 0.95 parts by weight of sodium dodecyl sulfate, 4.75 parts by weight of butyl acrylate, and methyl methacrylate were used to prepare the rubber seed. It was prepared in the same manner except that 0.25 parts by weight of the rate was used.

The average size of the obtained rubber polymer particles was 80 nm, the grafting rate of the graft copolymer was 97%, the weight average molecular weight of the shell was 68,000, and the grafting frequency was 0.143%.

The BA content in the prepared thermoplastic resin is 28.7%, the rubber glass transition temperature is -41°C, the BA coverage value is 97.3%, and the BA elution amount in the resin Sol is 1.65%.

Example 9

In Example 1, 29.75 parts by weight of butyl acrylate and 5.25 parts by weight of methyl methacrylate were used to prepare the rubber core, and 0.9 parts by weight of sodium dodecyl sulfate, 4.25 parts by weight of butyl acrylate, and methyl methacrylate were used to prepare the rubber seed. It was prepared in the same manner except that 0.75 parts by weight of the rate was used.

The average size of the obtained rubber polymer particles was 80 nm, the grafting rate of the graft copolymer was 103%, the weight average molecular weight of the shell was 52,000, and the grafting frequency was 0.198%.

The BA content in the prepared thermoplastic resin is 25.9%, the rubber glass transition temperature is -30°C, the BA coverage value is 125.2%, and the BA elution amount in the resin Sol is 1.5%.

Example 10

In Example 1, 26.25 parts by weight of butyl acrylate and 8.75 parts by weight of methyl methacrylate were used in the preparation of the rubber core, and 0.8 parts by weight of sodium dodecyl sulfate, 3.75 parts by weight of butyl acrylate, and methyl methacrylate were used in the preparation of rubber seeds. It was prepared in the same manner except that 1.25 parts by weight of the rate was used.

The average size of the particles of the obtained rubber polymer was 80 nm, the grafting rate of the graft copolymer was 115%, the weight average molecular weight of the shell was 43,000, and the grafting frequency was 0.267%.

The BA content in the prepared thermoplastic resin is 23.1%, the rubber glass transition temperature is -21°C, the BA coverage value is 166.3%, and the BA elution amount in the resin Sol is 1.23%.

Example 11

It was prepared in the same manner as in Example 1, except that 54 parts by weight of methyl methacrylate and 6 parts by weight of butyl acrylate were used in preparing the copolymer shell.

The graft copolymer obtained had a graft rate of 81%, a weight average molecular weight of the shell of 76,000, and a graft frequency of 0.107%.

The BA content in the resin is 32.2%, the BA coverage value is 67.4%, and the BA elution amount in the resin Sol is 3.92%.

Example 12

It was prepared in the same manner as in Example 1, except that 48 parts by weight of methyl methacrylate and 12 parts by weight of butyl acrylate were used in preparing the copolymer shell.

The graft copolymer obtained had a graft rate of 76%, a weight average molecular weight of the shell of 95,000, and a graft frequency of 0.08%.

The BA content in the resin is 33.6%, the glass transition temperature of the rubber is -35°C, the BA coverage value is 52.8%, and the BA elution amount in the resin Sol is 8.17%.

Example 13

In Example 3, the same preparation was made except that 100 parts by weight of the graft copolymer was used without using a matrix resin when preparing the thermoplastic resin.

The BA content in the resin is 33.8%, the BA coverage value is 88.8%, and the BA elution amount in the resin Sol is 5.00%.

Example 14

In Example 1, a styrene-acrylonitrile resin (S85RF, manufactured by LG Chem) was used in the same manner as in Example 1, except that 30 parts by weight of the matrix resin was used.

The BA coverage value of the resin is 77.5%, and the BA elution amount in the resin Sol is 1.89%.

Example 15

In Example 1, it was prepared in the same manner except that 30 parts by weight of a styrene-acrylonitrile-methyl methacrylate copolymer (XT500, manufactured by LG Chem) was used as a matrix resin when the thermoplastic resin was manufactured.

The BA coverage value of the resin is 77.5%, and the BA elution amount in the resin Sol is 1.89%.

Example 16

In Example 1, 4.25 parts by weight of butyl acrylate and 0.75 parts by weight of methyl methacrylate were used to prepare the rubber seed, and 34 parts by weight of butyl acrylate and 6 parts by weight of methyl methacrylate were used to prepare the rubber core, A graft copolymer was prepared in the same manner except that 52.25 parts by weight of methyl methacrylate and 2.75 parts by weight of butyl acrylate were used in preparing the copolymer shell.

The graft copolymer obtained had a graft rate of 103%, a weight average molecular weight of the shell of 61,000, and a graft frequency of 0.169%.

When the thermoplastic resin was prepared, 50 parts by weight of the prepared graft copolymer and 50 parts by weight of an alphamethylstyrene-styrene-acrylonitrile copolymer (S99UH, manufactured by LG Chem) were used as the matrix resin.

The BA content in the resin is 20.5%, the rubber glass transition temperature is -30°C, the BA coverage value is 125.2%, and the BA elution amount in the resin Sol is 0.4%.

Example 17

In Example 1, when the thermoplastic resin was prepared, 70 parts by weight of the prepared graft copolymer, 27 parts by weight of a methyl methacrylate resin (BA611, manufactured by LGMMA) as a matrix resin, and an alkyl acrylate-aromatic vinyl compound-vinyl It was prepared in the same manner except that 3 parts by weight of the cyanide compound copolymer (SA927, manufactured by LG Chem) was used.

The BA content in the resin is 32%, the BA coverage value is 72.1%, and the BA elution amount in the resin Sol is 1.61%.

Comparative Example 1

It was prepared in the same manner as in Example 1, except that 55 parts by weight of butyl acrylate was used in the preparation of the rubber core and 40 parts by weight of methyl methacrylate was used in the preparation of the copolymer shell.

The obtained rubber polymer particles had an average size of 85 nm, a graft rate of 38%, a weight average molecular weight of the shell of 82,000, and a graft frequency of 0.046%.

The BA content in the resin is 42%, the rubber glass transition temperature is -47°C, the BA coverage value is 38%, and the BA elution amount in the resin Sol is 0%.

Comparative Example 2

It was prepared in the same manner as in Example 2, except that 20 parts by weight of butyl acrylate was used in the preparation of the rubber core and 75 parts by weight of methyl methacrylate was used in the preparation of the copolymer shell.

The average size of the particles of the obtained rubber polymer was 75 nm, the grafting rate of the graft copolymer was 100%, the weight average molecular weight of the shell was 71,000, and the grafting frequency was 0.141%.

The BA content in the resin is 17.5%, the rubber glass transition temperature is -47°C, the BA coverage value is 100%, and the BA elution amount in the resin Sol is 0%.

Comparative Example 3

In Example 1, when preparing the rubber seed, 0.75 parts by weight of sodium dodecyl sulfate, 3.5 parts by weight of butyl acrylate, and 1.5 parts by weight of methyl methacrylate were used, and 24.5 parts by weight of butyl acrylate and methyl methacrylic were used in the preparation of the rubber core. It was prepared in the same manner except that 10.5 parts by weight of the rate was used, and 60 parts by weight of methyl methacrylate was used in the shell preparation.

The graft copolymer obtained had a graft rate of 120%, a weight average molecular weight of the shell of 32,000, and a graft frequency of 0.375%.

The BA content in the resin is 19.6%, the rubber glass transition temperature is -14°C, the BA coverage value is 214.3%, and the BA elution amount in the resin Sol is 0%.

Comparative Example 4

In Example 1, the shell was prepared in the same manner except that 45 parts by weight of methyl methacrylate and 15 parts by weight of butyl acrylate were used.

The graft copolymer obtained had a graft rate of 59%, a weight average molecular weight of the shell of 121,000, and a graft frequency of 0.049%.

The BA content in the resin is 38.5%, the BA coverage value is 38.6%, and the BA elution amount in the resin Sol is 11.48%.

Comparative Example 5

It was prepared in the same manner as in Example 1, except that 40 parts by weight of the graft copolymer powder and 60 parts by weight of the matrix resin were used in preparing the thermoplastic resin.

The graft frequency of the obtained graft copolymer was 0.120%.

The BA content in the resin is 17.2%, the BA coverage value is 77.5%, and the BA elution amount in the resin Sol is 0.74%.

Comparative Example 6

It was prepared in the same manner as in Comparative Example 1, except that 85 parts by weight of the graft copolymer powder and 15 parts by weight of the matrix resin were used in the preparation of the thermoplastic resin.

The graft frequency of the obtained graft copolymer was 0.046%.

The BA content in the resin is 51.0%, the BA coverage value is 38.0%, and the BA elution amount in the resin Sol is 0%.

Comparative Example 7

In Comparative Example 1, 38 parts by weight of methyl methacrylate and 2 parts by weight of butyl acrylate were used in the preparation of the shell, and 85 parts by weight of the graft copolymer powder and 15 parts by weight of the matrix resin were used in the preparation of the thermoplastic resin. It was prepared in the same way.

The graft copolymer obtained had a graft rate of 35.0%, a weight average molecular weight of the shell of 98,000, and a graft frequency of 0.036%.

The BA content in the resin is 52.7%, the BA coverage value is 32.7%, and the BA elution amount in the resin Sol is 2.59%.

Comparative Example 8

It was prepared in the same manner as in Example 1, except that 45.6 parts by weight of methyl methacrylate and 14.4 parts by weight of butyl acrylate were used in preparing the shell.

The graft copolymer obtained had a graft rate of 62%, a weight average molecular weight of the shell of 118,000, and a graft frequency of 0.053%.

The BA content in the resin is 38.1%, the BA coverage value is 41.0%, and the BA elution amount in the resin Sol is 10.82%.

Reference Example 1

In Example 4, 0.11 parts by weight of sodium dodecyl sulfate was used to prepare the rubber seed, and 50 parts by weight of methyl methacrylate was used to prepare the shell.

The average size of the particles of the obtained rubber polymer was 150 nm, the grafting rate of the graft copolymer was 98%, the weight average molecular weight of the shell was 126,000, and the grafting frequency was 0.078%.

The BA content in the resin is 35%, the BA coverage value is 97%, and the BA elution amount in the resin Sol is 0%.

[Test Example]

The physical properties of Examples 1 to 17, Comparative Examples 1 to 8, and Reference Example 1 were measured using the specimens and films prepared in the following manner, and the results are shown in Tables 1 and 2 below.

* DLS average particle size: After preparing a sample by diluting 0.1 g of the prepared rubber latex (solid content 35 to 50% by weight) with 100 g of deionized water, at 23° C. using a particle size distribution analyzer (Nicomp CW380, PPS) , the particle diameter was measured under an intensity value of 300 kHz in the intensity-weighted Gaussian analysis mode by the dynamic light scattering method, and the average value of the hydrodynamic diameter obtained from the scattering intensity distribution was obtained as the DLS average particle diameter.

* Graft rate (%): After adding 30 g of acetone to 0.5 g of the prepared graft polymer dry powder, stirring at 210 rpm for 12 hours at room temperature (23°C) (SKC-6075, Lab companion) and centrifuging it (Supra) R30, Hanil Science Co.), centrifuged at 0℃ at 18,000 rpm for 3 hours to collect insoluble fraction that was not dissolved in acetone, and then dried at 85℃ for 12 hours by forced circulation (OF-12GW, Lab companion). After measuring the weight, it can be calculated by Equation 4 below.

[Equation 4]

Graft rate (%) = [weight of grafted monomer (g) / rubber weight (g)] * 100

In Equation 4, the weight (g) of the grafted monomer is the weight obtained by dissolving the graft copolymer in acetone and centrifuging to subtract the rubber weight (g) from the weight of the insoluble matter (gel), and the rubber weight ( g) is a part by weight of the theoretically added rubber in the graft copolymer powder. Here, the part by weight of the rubber means the total sum of parts by weight of the unit component added during the manufacture of the rubber seed and the core.

* Weight average molecular weight of shell (g/mol): above After the portion (sol) dissolved in acetone obtained when measuring the graft rate was dissolved in a THF solvent, it was obtained as a relative value with respect to a standard PS (standard polystyrene) sample using GPC. Specific measurement conditions are as follows.

- Solvent: THF (tetrahydrofuran)

- Column temperature: 40℃

- Flow rate: 0.3 mL/min

- Sample concentration: 20 mg/mL

- Injection volume: 5 μl

- Column model: 1xPLgel 10um MiniMix-B (250x4.6mm) + 1xPLgel 10um MiniMix-B (250x4.6mm) + 1xPLgel 10um MiniMix-B Guard (50x4.6mm)

- Equipment name: Agilent 1200 series system

- Refractive index detector: Agilent G1362 RID

- RI temperature: 35℃

- Data processing: Agilent ChemStation S/W

- Test method: measured according to OECD TG 118

* BA content (wt%): ¹ H It was quantitatively measured through NMR analysis or FT-IR analysis. Specific measurement conditions are as follows.

^One H NMR

- Equipment name: Bruker 600MHz NMR(AVANCE III HD) CPP BB(1H 19F tunable and broadband, with z-gradient) Prodigy Probe

- Measurement conditions: ¹ H NMR (zg30): ns=32, d1=5s, TCE-d2, at room temp.

FT-IR

- Equipment name: Agilent Cary 660

- Measurement condition: ATR mode

* Gel content: After adding 30 g of acetone to 0.5 g of the prepared thermoplastic resin dry powder, stirring at 210 rpm for 12 hours at room temperature (SKC-6075, Lab companion) and centrifuging it (Supra R30, Hanil Science) After centrifugation at 0 ° C. at 18,000 rpm for 3 hours to collect insoluble fraction that did not dissolve in acetone, the weight was measured after drying (OF-12GW, Lab companion) at 85 ° C. for 12 hours by forced circulation. It was calculated by Equation 3.

[Equation 3]

Gel content (%) = {weight of insoluble matter (gel) / weight of sample} * 100

* Graft frequency (%): It was calculated by Equation 2 below. In the above Examples and Comparative Examples, the weight average molecular weight of portions excluding rubber in Equation 2 indicates the weight average molecular weight of the shell.

[Equation 2]

Graft frequency (%) = [Graft rate / {weight average molecular weight of parts excluding rubber}] * 100

* Butyl acrylate (BA) coverage (%): It was calculated by Equation 1 below.

[Equation 1]

X(%) = {(G-Y)/Y} * 100

In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel. Here, the butyl acrylate content (wt%) in the gel was ^{quantitatively measured using 1} NMR analyzer or FT-IR.

* Butyl acrylate elution amount (wt%): 30 g of acetone was added to 0.5 g of dry thermoplastic resin powder, stirred at 210 rpm for 12 hours at room temperature (SKC-6075, Lab companion), and then centrifuged (Supra R30) , Hanil Science Co., Ltd.) by centrifugation at 0°C at 18,000 rpm for 3 hours, and drying the acetone solution from which the insoluble matter was separated at 85°C for 12 hours at 85°C by forced circulation (OF-12GW, Lab companion) to obtain a resin sol (Sol). ), which ^{was quantitatively measured by 1} NMR analyzer or FT-IR analysis.

* Glass transition temperature: Per ASTM D 3418 Measurements were made at a temperature increase rate of 10° C./min. using a TA Instruments Q100 DSC.

* Impact strength (1/4"; kgf cm/cm): According to ASTM D256, it was measured under 23 ℃ temperature.

* Melt flow index (MI): Measured at 220°C under 10 kg according to ASTM D-1238 It was heated with a furnace and put into a cylinder of a melt indexer, a load of 10 kg was applied with a piston, and the weight (g) of the resin melted for 10 minutes was measured and obtained.

* Colorability (blackness; Color L): According to the CIE1976 L*a*b* color system, 1 part by weight of black colorant was added to 100 parts by weight of the thermoplastic resin, and then color L using a color meter (Model Name: Color Eye 7000A) The values were measured. At this time, L=100 means pure white, and L=0 means pure black, and the lower the L value, the better the black feeling.

* Weather resistance (ΔE): A specimen prepared by adding 1 part by weight of black colorant to 100 parts by weight of the thermoplastic resin, accelerated weather resistance testing apparatus (weather-o-meter, ATLAS Ci4000, xenon arc lamp, Quartz (inner)) /S.Boro (outer) filter, irradiance 0.55W/m ² at 340 nm) After 6,000 hours of measurement under the applied SAE J2527 condition, ΔE calculated by the following Equation 6 was evaluated. The following ΔE is the arithmetic mean value of Hunter Lab (L, a, b) values measured before and after the accelerated weather resistance test, and the closer the ΔE value is to 0, the better the weather resistance is.

[Equation 6]

ΔE= √{(L-L')2 + (a-a')2 + (b-b')2} (√ : radical sign)

* Surface glossiness (%): 23℃ temperature and incident angle using a Gloss meter (VG7000, NIPPON DENSHOKU) It was measured according to ASTM D528 at 60°.

* Whitening: When the prepared film was bent 180˚ in the longitudinal direction (MD) and transverse direction (TD), it was visually determined whether whitening occurred (bending whitening).

In addition, a film specimen having a width and length of 100 mm x 100 mm and a thickness of 0.15 mm was prepared and a weight of 1 kg (Cat No. 1249, When a falling weight of 1 kg) is dropped vertically onto the film from a height of 100 mm, the haze before and after the impact of the impact part (center of the film) impacted by the weight is measured according to ASTM D1003-95, and then the following math It was calculated by Equation 7 (Nakgu Baekhwa).

[Equation 7]

Haze difference = haze value after falling - haze value before falling

In Tables 1 and 2 below, bending whitening was expressed as O when whitening occurred and X when whitening did not occur (no whitening), and falling whitening was expressed as the difference in haze obtained by Equation 7 above.

At this time, haze was measured at 23° C. in accordance with ASTM D1003-95 using a haze meter (model name: HM-150) of MURAKAMI.

division BA content in thermoplastic resin (wt%) BA Coverage (%) Example 1 30.1 77.5 Example 2 23.5 116.0 Example 3 26.8 88.8 Example 4 36.8 57.1 Example 5 30.1 72.2 Example 6 30.1 80.9 Example 7 30.1 83.6 Example 8 28.7 97.3 Example 9 25.9 125.2 Example 10 23.1 166.3 Example 11 32.2 67.4 Example 12 36.4 52.8 Example 13 38.3 88.8 Example 14 30.1 77.5 Example 15 30.1 77.5 Example 16 20.5 125.2 Example 17 32.0 72.1 Comparative Example 1 42.0 38.0 Comparative Example 2 17.5 100.0 Comparative Example 3 19.6 214.3 Comparative Example 4 38.5 38.6 Comparative Example 5 17.2 77.5 Comparative Example 6 51.0 38.0 Comparative Example 7 52.7 32.7 Comparative Example 8 38.1 41.0 Reference Example 1 35.0 98.0

division flow index
[g/10min] impact strength
[kg·cm/cm] Film gloss Weatherability ΔE coloration L all sorts of flowers TD MD falling ball Example 1 7.8 5.1 132 0.9 23.9 X X 2.3 Example 2 9.6 4.8 135 1.7 24.0 X X 1.8 Example 3 12.5 4.5 138 1.2 24.3 X X 2.1 Example 4 5.6 6.1 126 0.6 23.7 X X 3.7 Example 5 6.3 4.1 130 0.5 23.6 X X 1.6 Example 6 9.6 5.7 126 2.1 24.0 X X 2.5 Example 7 8.2 6.2 124 2.5 24.2 X X 2.8 Example 8 8.2 4.9 134 0.8 23.8 X X 2.2 Example 9 11.8 4.6 136 0.7 23.6 X X 2.0 Example 10 15.2 4.3 139 0.5 23.5 X X 1.8 Example 11 7.2 5.6 126 1.4 23.7 X X 2.0 Example 12 8.9 5.9 123 1.7 23.5 X X 1.4 Example 13 8.3 7.2 125 1.6 24.1 X X 1.5 Example 14 10.3 5.3 121 2.1 24.7 X X 2.4 Example 15 6.4 5.4 124 1.4 24.4 X X 2.6 Example 16 6.2 5.0 108 1.8 24.8 X X 3.9 Example 17 6.7 10.5 118 1.2 24.3 X X 7.2 Comparative Example 1 2.6 6.5 92 3.5 24.6 O O 75.8 Comparative Example 2 8.2 2.1 121 1.3 24.8 O O 43.3 Comparative Example 3 16.2 1.5 140 1.8 24.4 X X 28.6 Comparative Example 4 4.2 5.2 98 1.9 24.9 O O 21.6 Comparative Example 5 10.2 2.3 121 2.1 24.7 O O 39.6 Comparative Example 6 1.7 8.3 90 3.8 24.8 O O 71.3 Comparative Example 7 1.3 8.7 86 4.0 24.7 O O 49.8 Comparative Example 8 5.1 5.4 100 1.8 24.7 O O 19.5 Reference Example 1 4.5 6.8 99 4.2 25.3 O O 37.6

Referring to Tables 1 and 2, the thermoplastic resins (Examples 1 to 17) according to the present invention have excellent gloss, weather resistance, and colorability while maintaining a proper balance of flow index and impact strength, and in particular, bending whitening does not occur. The difference in haze before and after the falling ball impact was 10 or less, confirming that the whitening property was very excellent. On the other hand, in the case of the thermoplastic resin (Comparative Examples 1 to 8) outside the scope of the present invention, the balance between the flow index and impact strength was lowered, gloss, weather resistance and colorability were generally reduced, and whitening occurred during bending, and falling balls The difference in haze before and after impact was found to exceed 19, confirming that the whitening property was very poor.

1 is a photograph taken after bending the films prepared in Examples (left photo) and Comparative Example (right photo) in the Md and Td directions, respectively, to check whether or not whitening occurs. Although whitening did not occur in the site, the non-whitening characteristic was confirmed, but it was confirmed that the comparative example outside the scope of the present invention had severe whitening in the bent area.

In addition, the following Figure 2 is a photograph taken after each hit with a Gardner impact tester in order to check whether the films prepared in Examples (left photo) and Comparative Example (right photo) are whitened, here as well according to the present invention In the example, whitening did not occur in the impact part, and thus the non-whitening characteristic was confirmed, but in the comparative example outside the scope of the present invention, it was confirmed that the whitening occurred severely in the impact part.

Claims (17)

(A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; and (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates, and alkyl acrylates;
The total alkyl acrylate content is 20 to 50% by weight,
The butyl acrylate coverage value (X) calculated by the following Equation 1 is 50 or more
Thermoplastics.
[Equation 1]
X = {(GY)/Y} * 100
(In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.)
The method of claim 1,
The (A) alkyl acrylate-alkyl methacrylate graft copolymer is 50 to 100 wt%, and (B) 1 selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates and alkyl acrylates. The matrix resin comprising more than one species is characterized in that it is included in an amount of 0 to 50% by weight.
Thermoplastics.
The method of claim 1,
The thermoplastic resin is characterized in that the elution amount of butyl acrylate in acetone is 0.1 wt% or more
Thermoplastics.
The method of claim 1,
The (A) copolymer is, based on 100 wt% of the (A) copolymer, (a-1) 25 to 50 weight by weight of an alkyl acrylate rubber having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm %; and (a-2) 50 to 75 wt% of an alkyl acrylate-alkyl methacrylate copolymer;
Thermoplastics.
5. The method of claim 4,
The (A) copolymer has a graft rate of 60 to 200%, and the (a-2) copolymer has a weight average molecular weight of 40,000 to 120,000 g/mol.
Thermoplastics.
5. The method of claim 4,
The glass transition temperature of the thermoplastic resin, the (a-1) rubber, or both of them is -50 to -20 ℃, characterized in that
Thermoplastics.
5. The method of claim 4,
The (a-1) rubber is characterized in that it further comprises an alkyl methacrylate
Thermoplastics.
8. The method of claim 7,
The alkyl methacrylate is characterized in that 0.1 to 25% by weight of the (a-1) rubber total 100% by weight
Thermoplastics.
5. The method of claim 4,
The (a-2) copolymer is 80 to 99.9 wt% of an alkyl methacrylate based on 100 wt% of the (a-2) copolymer and 0.1 to 20% by weight of alkyl acrylate.
Thermoplastics.
5. The method of claim 4,
The (A) copolymer is characterized in that the graft frequency calculated by the following formula (2) is 0.05 to 0.375%
Thermoplastics.
[Equation 2]
Graft frequency (%) = [Graft rate / {weight average molecular weight of parts excluding rubber}] * 100
The method of claim 1,
The (B) matrix resin is composed of an aromatic vinyl compound-vinyl cyan compound copolymer, an aromatic vinyl compound-vinyl cyan compound-alkyl methacrylate copolymer, an alkyl methacrylate polymer, and an alkyl methacrylate-alkyl acrylate copolymer. Characterized in that at least one selected from the group
Thermoplastics.
12. The method of claim 11,
The (B) matrix resin further comprises an aromatic vinyl compound-vinyl cyan compound-alkyl acrylate copolymer
Thermoplastics.
The method of claim 1,
The thermoplastic resin was extruded into a film having a thickness of 0.15 mm and a weight of 1 kg was dropped vertically onto the film from a height of 100 mm under a temperature of 23° C. using a Gardner impact tester. Characterized in that the difference between the haze values measured according to ASTM D1003-95 before and after the impact of the impacted part is 10 or less
Thermoplastics.
(A) an alkyl acrylate-alkyl methacrylate graft copolymer, or (A) an alkyl acrylate-alkyl methacrylate graft copolymer; And (B) a matrix resin comprising at least one selected from the group consisting of aromatic vinyl compounds, vinyl cyan compounds, alkyl methacrylates and alkyl acrylates; including, kneading and extruding,
The total alkyl acrylate content of the thermoplastic resin is 20 to 50% by weight,
The butyl acrylate coverage value (X) calculated by the following Equation 1 of the thermoplastic resin is 50 or more
A method for producing a thermoplastic resin.
[Equation 1]
X = {(GY)/Y} * 100
(In Equation 1, G represents the total gel content (%) of the thermoplastic resin, and Y represents the weight% of butyl acrylate in the gel of the thermoplastic resin.)
15. The method of claim 14,
The (A) graft copolymer comprises 25 to 50 parts by weight of an alkyl acrylate rubber having a DLS average particle diameter of 40 to 120 nm or a TEM average particle diameter of 25 to 100 nm; and 50 to 75 parts by weight of an alkyl acrylate compound and an alkyl methacrylate compound; characterized in that it is prepared by emulsion polymerization of 100 parts by weight of a monomer mixture containing
A method for producing a thermoplastic resin.
Claims 1 to 13, characterized in that it comprises the thermoplastic resin of any one of claims
molded article.
17. The method of claim 16,
The molded article is characterized in that the finishing material
molded article.

Images