JPH08269232A - Resin molding for interior furnishing - Google Patents

Abstract

PURPOSE: To obtain a resin molding for an interior furnishing, excellent in light resistance and an antifogging effect on glass. CONSTITUTION: This molding is made from a composition comprising 100 pts.wt. thermoplastic resin, 0.01-1 pt.wt. primary hindered amine light stabilizer having a molecular weight of 700 or below and a melting point of 100 deg.C or above and 0.01-1 pt.wt. secondary hindered amine light stabilizer having a molecular weight of 1500-4000. Examples of the thermoplastic resins used include an olefin resin, an ABS resin, a polycarbonate resin and composite reinforced products thererof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article used for interior parts for automobiles and the like, and more particularly to a resin molded article for interior parts which is excellent in light resistance and glass fogging prevention effect.

[0002]

2. Description of the Related Art The weight reduction of automobile interior parts such as instrument panel body, console box, pillar, etc.
A resin molding is used because of low cost and easy molding. Examples of the resin molded body include those molded from a resin molded product such as polypropylene or composite polypropylene.

A light stabilizer is added to and mixed with this resin composition in order to prevent deterioration due to sunlight. As such a light stabilizer, a hindered amine light stabilizer such as bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate is often used.

[0004]

[Problems to be Solved] However, although the hindered amine light stabilizers are excellent in short-term light stability, they cannot be said to be sufficiently satisfactory in the long term. Also,
Since the light stabilizer has a low molecular weight and a low melting point, it floats on the surface and is easily volatilized and evaporated. As a result, the light stabilizer adheres to a glass window of an automobile and causes a problem of causing fogging, that is, fogging or haze on the window glass.

In view of the above conventional problems, the present invention aims to provide a resin molding for interior parts, which is excellent in light resistance and an effect of preventing fogging on glass.

[0006]

According to the present invention, 100 parts by weight of a thermoplastic resin is added with 0.01 to 1 part by weight of a first hindered amine light stabilizer having a molecular weight of 700 or less and a melting point of 100 ° C. or more, and a second hindered amine light stabilizer having a molecular weight of 1500 to 4000. A resin molded product for interior parts, comprising 0.01 to 1 part by weight of a hindered amine light stabilizer.

The above-mentioned first hindered amine light stabilizer has a molecular weight of 700 or less and a melting point of 100 ° C. or more. When the molecular weight is more than 700, the immediate effect is inferior, and cracks may occur due to long-time light irradiation. When the melting point is less than 100 ° C, when exposed to high temperature such as summer, the light stabilizer floats on the surface of the molded body, volatilizes and evaporates, and adheres to the nearby glass window to cause fogging on the glass window. May occur. Examples of the first hindered amine-based light stabilizer include those shown in FIG.

The second hindered amine light stabilizer has a molecular weight of 1500 to 4000. If it is less than 1500, long-term effects cannot be expected. On the other hand, when it exceeds 4000, it is difficult to act effectively as a light stabilizer, which is not preferable. Examples of the second hindered amine light stabilizer include those shown in FIGS. 3 and 4.

As the thermoplastic resin, for example, one or more resins selected from the group consisting of olefin resins, ABS resins, polycarbonate resins, and composite reinforced resins thereof can be used.

Examples of the olefin resin include block polypropylene and homopolypropylene. As the composite reinforcing resin, there is a composite resin composed of polypropylene, ethylene-propylene copolymer rubber (hereinafter referred to as EPR), and talc.

The first hindered amine light stabilizer is
0.01 to 1 with respect to 100 parts by weight of the thermoplastic resin
Add parts by weight. If the amount is less than 0.01 part by weight, a sufficient light-stabilizing effect cannot be expected in the obtained resin molding. On the other hand, when it exceeds 1 part by weight, the light stability is remarkably exerted, but it is not preferable because it easily floats on the surface of the resin molding and the cost becomes high.

The second hindered amine light stabilizer is
The amount is 0.01 to 1 part by weight based on 100 parts by weight of the thermoplastic resin. If the amount is less than 0.01 part by weight, a sufficient light-stabilizing effect cannot be expected in the obtained resin molding. On the other hand, when it exceeds 1 part by weight, the light stability is remarkably exerted, but it is not preferable because it easily floats on the surface of the resin molding and the cost becomes high.

In addition to the above light stabilizers, it is preferable to add and mix a hindered phenol antioxidant, a phosphorus heat stabilizer, an ultraviolet absorber, etc. within a range that does not significantly impair the effects of the present invention. As a result, it is possible to balance the weather resistance, the processing heat stability, and the heat resistance in a high temperature atmosphere.

The resin molded product of the present invention can be used for interior parts for automobiles such as instrument panel bodies, console boxes, pillars, etc., or interior parts for ships, buildings and the like.

[0015]

FUNCTION AND EFFECT As described above, the resin molded article for interior parts according to the present invention comprises the first hindered amine light stabilizer having a small molecular weight and a high melting point and the second hindered amine light stabilizer having a large molecular weight. It is compounded with resin.

Therefore, it is instantly effective against light and stable for a long time. Therefore, even when exposed to strong sunlight, it can continue to exert an excellent light stabilizing effect. Therefore, the amount of the light stabilizer floating on the surface of the resin molded body is small, and the possibility of volatilization and evaporation is small. Therefore, the window glass near the interior parts is not polluted, and the occurrence of fogging is much less than before.

According to the present invention, it is possible to provide a resin molding for interior parts, which is excellent in light resistance and the effect of preventing fogging on glass.

[0018]

EXAMPLE A resin molded article for interior parts according to an example of the present invention will be described. In this example, the light resistance and the effect of preventing fogging on glass were evaluated for automobile interior parts made of the following resin compositions. In the evaluation, as shown in Table 1, a resin composition comprising a thermoplastic resin and a hindered amine light stabilizer was used.

As the thermoplastic resin, polypropylene or polypropylene composite resin is used. As the polypropylene (hereinafter referred to as PP), a block polypropylene having a melt flow rate of 30 and an ethylene content of 7.3% by weight was used.

As the polypropylene composite resin, P
A composite resin composed of P, EPR, and talc was used. In the composite resin, the polypropylene is
The same thing as PP as the above-mentioned thermoplastic resin was used. As the EPR, the Mooney viscosity ML _{1 + 4} (10
An ethylene / propylene copolymer rubber having a propylene content of 26% by weight was used. The talc used had an average particle size of 2 μm.

The above light stabilizers include HALS-0 as a comparative hindered amine light stabilizer, HALS-1 as a first hindered amine light stabilizer, and HALS-21 as a second hindered amine light stabilizer. Two
4 types of 2 were used. As shown in FIG. 1, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate was used as the HALS-0. Its molecular weight is 480 and its melting point is 83 ° C.

As the above-mentioned HALS-1, as shown in FIG. 2, 2-methyl-2- (2,2,6,6-tetramethyl-4-piperidyl) amino-N- (2,2,6,6) ─
Tetramethyl-4-piperidyl) propionamide was used. Its molecular weight is 380 and its melting point is 125 ° C.

As the HALS-21, as shown in FIG. 3, poly [{(6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-
Diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {(2,2,6,6-
Tetramethyl-4-piperidyl) imino}] was used.
Its molecular weight is 2500.

As the HALS-22, as shown in FIG. 4, poly [(6-morpholino-s-triazine-
2,4-diyl) {(2,2,6,6-tetramethyl-
4-piperidyl) imino} -hexamethylene-{(2,
2,6,6-tetramethyl-4-piperidyl) imino}] was used. Its molecular weight is 2000. H above
The molecular weights and melting points of ALS-0,1,21,22 are summarized in Table 2.

In addition to the components shown in Table 1, 0.2 parts by weight of a hindered phenol-based antioxidant and phosphorus-based heat-stabilizing agent were added to the above resin composition. 0.1 parts by weight of the agent was added and mixed. The chemical structural formulas of the hindered phenol antioxidant and phosphorus heat stabilizer are shown in FIGS. 5 and 6.

The above resin composition is kneaded by using a twin-screw extruder, pelletized, and then 100 mm × by an injection molding machine.
It was molded into a 25 mm x 2 mm test piece. Test pieces molded from each resin composition were used as samples E1 to E4 according to the present invention.
And samples C1 to C3 according to the comparative example. With respect to the above test piece, the effect of preventing fogging on glass and the light resistance of the test piece itself were measured by the following methods.

(Effect of Preventing Fogging) The haze of a glass plate is measured by using a tester shown in FIG. That is, the tester is a glass container 2 (volume of about 500 ml, internal diameter of 70 m
m, mouth diameter 40 mm) and a glycerin bath 5 for heating the glass container 2. Put the test piece 1 in the glass container 2 and attach the mouth part to the glass plate 3 (47 mm x 47 mm).
mm × 3 mm, glass haze 0.4% or less). The temperature of the glycerin bath 5 is set to 1 by the heater 52.
Bring to 00 ° C. The glass container 2 is set by adjusting the container base 51 so that the glass container 2 is immersed in the glycerin bath 5 about 2/3. In this state, the glass container 2 is heated for 20 hours. In FIG. 7, reference numeral 53 is a thermometer, reference numeral 5
4 indicates a stirrer.

After heating, using the integrating sphere type light transmittance measuring device, the incident light amount T ₁ of the glass plate 3, the total transmitted light amount T ₂ , the scattered light amount T ₃ by the device, and the light amount T scattered by the device and the test piece. ₄ and are measured, and the glass haze (%) is calculated by the following "formula 1".

[0029]

[Equation 1]

(Light resistance) Light resistance was evaluated by the color difference ΔE ^* due to xenon fade and the crack generation time.・ (Color difference ΔE ^* due to xenon fade) Black panel temperature 83 ℃, 250 with xenon fade meter
The test was conducted under time conditions. -(Crack generation time) The test was conducted under the condition of a black panel temperature of 83 ° C with a xenon fade meter.
The presence or absence of cracks in the test piece was confirmed with a 30 × magnifying glass, and the time at which cracks occurred was recorded.

Next, Table 1 shows the measurement results. As known from the table, Examples E1 to E4 according to the present invention
In both cases, the glass haze indicating the fogging condition is 3.2.
It was as low as less than%. The color difference ΔE ^* due to xenon fade was as low as 1.6 or less, and the crack generation time was as long as 2800 hours or more.

On the other hand, in the comparative example, the sample C1 using only one kind of low molecular weight and low melting point light stabilizer was
High glass haze and color difference ΔE ^* due to xenon fade
It was also expensive. Sample C2 using only one low molecular weight and high melting point light stabilizer had a high glass haze. In sample C3 using only one type of high molecular weight light stabilizer, cracks occurred in a short time.

Summarizing the evaluation results of the above-mentioned seven samples, the effect of preventing fogging on glass is good when a light stabilizer having a high molecular weight is used. Further, the light resistance represented by the color difference ΔE ^* due to xenon fade and the crack initiation time is a light stabilizer having a low molecular weight and a high melting point,
When a mixture with a high molecular weight light stabilizer is used, it is higher than the conventional one and very good. From this, it is understood that the resin molded product of the present invention is excellent in the fogging prevention effect on glass and light resistance, and is suitable as an automobile interior part.

[0034]

[Table 1]

[0035]

[Table 2]

[Brief description of drawings]

FIG. 1 is an explanatory view of a chemical structural formula of HALS-0 in Examples.

FIG. 2 is an explanatory diagram of a chemical structural formula of HALS-1 in Examples.

FIG. 3 is an explanatory view of a chemical structural formula of HALS-21 in Examples.

FIG. 4 is an explanatory diagram of a chemical structural formula of HALS-22 in Examples.

FIG. 5 is an explanatory view of a chemical structural formula of a hindered phenolic antioxidant in Examples.

FIG. 6 is an explanatory diagram of a chemical structural formula of a phosphorus-based heat stabilizer in Examples.

FIG. 7 is an explanatory view showing a method for testing the effect of preventing fogging on glass in Examples.

[Explanation of symbols]

 1. ． ． Test piece, 2. ． ． Glass container, 3. ． ． Glass plate,

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location C08L 79/02 LQZ C08L 79/02 LQZ 101/00 LTA 101/00 LTA

Claims (2)

[Claims] 1. A molecular weight of 7 per 100 parts by weight of a thermoplastic resin.
0.01 to 1 part by weight of a first hindered amine light stabilizer having a melting point of 100 ° C. or higher and a molecular weight of 1500 to 40
And 0.01 to 1 part by weight of the second hindered amine-based light stabilizer of No. 00. 2. The thermoplastic resin according to claim 1, wherein the thermoplastic resin is one or more resins selected from the group consisting of an olefin resin, an ABS resin, a polycarbonate resin, and a composite reinforcing resin thereof. Molded resin products for interior parts.