KR100523477B1 - Polymer Composition of Polyester for Metal Deposition - Google Patents

Abstract

Polyester resin composition with improved deposition properties according to the present invention (A) 40 to 90% by weight of PBT resin; (B) 5 to 30% by weight of PET resin; (C) 0.1 to 5% by weight of reaction catalyst between epoxy and PBT carboxyl terminal group; (D) 0.1 to 10% by weight of an epoxy compound having two or more epoxy groups; And (E) 2 to 30% by weight of glass fibers and inorganic fillers based on the entirety of (A), (B), (C), and (D).

Description

Polyester Composition of Polyester for Metal Deposition

Field of invention

The present invention relates to a polyester resin composition. More specifically, the present invention is excellent in surface properties and impact resistance by losing the adhesive strength of aluminum even if the aluminum is deposited on the surface in a high heat environment for a long period of time, excellent surface properties and impact resistance deposition properties very useful as a metal deposition exterior material This improved polyester resin composition is disclosed.

Background of the Invention

In general, a molded article in which aluminum is deposited on a surface, for example, a reflector for an automobile headlamp, is disposed in an engine room of an automobile and is affected by not only heat generated from a light bulb but also a lot of heat emitted from the engine. Heat resistance is required. Conventionally, such moldings have been produced using a bulk molding compound (BMC) using an unsaturated polyester which is a thermosetting resin having excellent heat resistance. BMC is suitable for headlamps due to its high heat resistance, excellent surface roughness and dimensional stability, but it is impossible to recycle due to the disadvantage of thermosetting resin. Many problems occurred at the time.

Recently, as a method for solving the problem of recycling, attempts have been actively made to employ a headlamp reflector using a high heat-resistant thermoplastic resin. The use of thermoplastic resins is not only an advantage of recycling, but also an ease of injection molding. In recent years, materials to be applied to the production of such molded products include polyamide, polybutylene terephthalate, polycarbonate, and the like. Among them, polybutylene terephthalate is in a situation in which the demand is expanding due to the excellent heat resistance and chemical resistance of the resin itself and the ease of aluminum deposition.

As mentioned above, in order to be used as a material for the headlamp reflector, it has to satisfy the demanding conditions such as heat resistance, paintability, surface smoothness, dimensional stability, vibration resistance, and moldability. Especially important is heat resistance and surface smoothness, so that the resin properties are important for the resin because the headlamp reflector receives heat from the headlamp bulb and engine for a long time. As a measure of the deterioration of physical properties in a high temperature environment for a long time, a relative temperature index (RTI) certified by the Underwriters Laboratory (UL) can be used. In the case of the headlamp reflector, the long-term use temperature should be about 180 ° C or higher, considering the environment of the engine room, so that it can be safely applied. However, the above-mentioned thermoplastic resins are not suitable for RTI as shown in Table 1 below, and thus are unsuitable for manufacturing moldings exposed to high temperature environments by depositing aluminum such as headlamp reflectors.

Thermoplastic RTI (℃) Polyamide 66 105 to 130 Polyamide 46 140 Polybutylene terephthalate 120 to 150 Polycarbonate 110-125

Accordingly, the present inventors have developed a polybutylene terephthalate resin composition having good aluminum deposition properties in which aluminum is deposited on a surface and subjected to a high temperature environment for a long time without losing the adhesive strength of aluminum.

SUMMARY OF THE INVENTION An object of the present invention is to provide a polybutylene terephthalate resin composition having good aluminum deposition properties, in which aluminum is deposited on a surface and placed in a high temperature environment for a long period of time without losing the adhesive strength of aluminum.

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

The resin composition used in the present invention is (A) 40 to 90% by weight of PBT resin; (B) 5 to 30% by weight of PET resin; (C) 0.1 to 5% by weight of reaction catalyst between epoxy and PBT carboxyl terminal group; (D) 0.1 to 10% by weight of an epoxy compound having two or more epoxy groups; And (E) 2 to 30% by weight of glass fibers and inorganic fillers based on the entirety of (A), (B), (C), and (D).

When the content of the filler is less than 20% by weight, not only the heat resistance and strength are relatively insufficient, but also the shrinkage is large, whereas when used in excess of 70% by weight, the moldability is lowered because the fluidity is lowered. Problems such as reduced reflection effect of reflector due to poor smoothness. In the case of using a mixed filler, it is suitable to use 3 to 40% by weight of the fibrous filler and 2 to 60% by weight of the inorganic filler relative to the total composition. The fibrous filler is added to impart excellent mechanical strength and heat resistance. In the present invention, it is preferable to use glass fiber, carbon fiber, talc, calcium metasilicate or a mixture thereof .

The PBT resins were low viscosity PBT and I.V. I.V. (Intrinsic Viscosity) 0.85 ± 0.02 level. A medium viscosity PBT is used that mixes a high viscosity PBT at 1.10 ± 0.02 from 20:80 to 80:20.

The PET resin is I.V. Low viscosity PET at the level of 0.77 ± 0.04.

The epoxy compound having two or more epoxy groups may be a polyglycidyl ether compound, a polyglycidylamine epoxy compound, a bisphenol A epoxy compound, a bisphenol F epoxy compound, a resorcinol type epoxy compound, a tetrahydroxy bisphenol F epoxy compound, or a cresol. It is selected from the group consisting of a novolak-type epoxy compound, a phenol novolak-type epoxy compound, and a cycloaliphatic epoxy compound. Specific examples thereof include 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane (3,4 -epoxy cyclohexyl methyl-3,4-epoxy cyclohexane). The reaction catalyst for epoxy and PBT carboxyl end groups is lower alkyl esters such as phosphoric acid, phosphorous acid, phosphinic acid and phosphonic acid, phosphonium compounds, imidazole compounds, and trivalent compounds. Amines, tetravalent ammonium salts.

In the following description, a method of manufacturing an aluminum vapor-deposited molding from the resin composition will be described. First, a desired molded product is molded from the resin composition prepared in the above-described composition. Implement the process.

As described above, aluminum-deposited moldings of polybutylene terephthalate resins prepared by the resin composition of the present invention, particularly reflectors for automobile headlamps, do not lose the adhesive strength of aluminum even when placed in a high temperature environment for a long time. There is this.

Features and other advantages of the polybutylene terephthalate resin composition of the present invention as described above will become more apparent from the examples described later. However, the present name is not limited to the examples.

Examples 1-4 and Comparative Examples 1-2

Polybutylene terephthalate, glass fibers (Owens-corning GF 183F), and inorganic filler (Sakamoto Yakuhin UPN HS-T 0.5) are melt mixed by feeding into a twin screw extruder at a cylinder temperature of 260 to 270 ° C. in the amounts shown in Table 2 below. It was pelletized after. Using the pellets thus prepared, the fluidity and heat deflection temperature were measured by the following method, and the results are shown in Table 2 below.

liquidity

After drying for 4 hours in a 120 ℃ dryer, measure the melt index under the condition of 260 ℃ and 2.16 kg load according to ASTM test method.

Heat deflection temperature

Heat deformation temperature is measured by using the mold temperature 800 ~ 120 ℃, cylinder temperature 250 ~ 300 ℃ according to the general method specified in ASTM test method.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Polybutylene terephthalate 75 75 65 65 65 75 Polyethylene terephthalate - - 10 10 10 - Fiberglass 5 15 5 15 - - Inorganic filler 20 10 20 10 25 25 Epoxy (1) 0.3 0.3 0.3 0.3 0.3 0.3 Lubricant 0.1 0.1 0.1 0.1 0.1 0.1 Sodium Phosphate 0.1 0.1 0.1 0.1 0.1 0.1 Heat deflection temperature 215 220 210 220 205 200 liquidity 68 56 72 56 44 53

Epoxy (1): Cyclohexyl Methyl-3,4-Epoxy Cyclohexane CA (UNION CARBIDE, ERL-4221)

Lubricant: Ethylene Bis Stearoamide,

Sodium Phosphate: Hydrogen Phosphate Anhydrous, Sodium Phosphate

Examples 5-6

The polybutylene terephthalate resins prepared in Examples 3 and 4 were manufactured using a molding machine having a mold temperature of 80 to 120 ° C. and a cylinder temperature of 250 to 300 ° C. to prepare a plate specimen having a thickness of 3 mm. The specimen obtained here was washed with acetone and treated for about 5 minutes using a plasma treatment apparatus, and then impregnated with 1 wt% silane coupling agent for 10 minutes and dried under vacuum. Then, after coating an aluminum coating film using a vapor deposition machine, the molded specimen and adhesive strength were evaluated by tape. According to the tape test method according to ASTM D3359, the aluminum-deposited specimen was formed by lattice-shaped grooves on the surface of the material on which the aluminum film was formed, and then the tape was attached and detached to evaluate the adhesive strength from the holding state of the aluminum film. In other words, using a razor blade to engrave a grid of 10 × 10 in 1 mm intervals, and then maintained the tape for 90 seconds and was classified into six grades as shown in Table 3 according to the state of the aluminum film fell off when peeled off. The adhesion evaluation results are shown in Table 4 below.

Rating 5 4 3 2 One 0 Extent of falling off 0% 0 to 5% 5-15% 15 to 35% 35 to 65% 〉 65%

Examples 7-8

Pellets prepared in the composition of Comparative Examples 1 and 2 were prepared in the same manner as in Examples 5 and 6, and the adhesion of aluminum deposition was evaluated by the method described above.

division Example 5 Example 6 Example 7 Example 8 Specimen Composition Example 3 Example 4 Comparative Example 1 Comparative Example 2 Fiberglass 5% 15% - - Inorganic filler 20% 10% 25% 25% Adhesion 3 2 5 5

The present invention has the effect of providing a polybutylene terephthalate resin composition having good aluminum deposition properties that does not lose the adhesive strength of aluminum even if aluminum is deposited on the surface in a high temperature environment for a long time.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (3)

(A) 40 to 90% by weight of PBT resin; (B) 5 to 30% by weight of PET resin; (C) 0.1 to 5% by weight of reaction catalyst between epoxy and PBT carboxyl terminal group; (D) 0.1 to 10% by weight of an epoxy compound having two or more epoxy groups; And (E) A polyester resin composition having improved deposition properties, comprising 2 to 30% by weight of glass fibers and an inorganic filler with respect to the entirety of (A), (B), (C) and (D). The epoxy compound (D) according to claim 1, wherein the epoxy compound (D) having two or more epoxy groups is a polyglycidyl ether compound, a polyglycidyl amine epoxy compound, a bisphenol A type epoxy compound, a bisphenol F type epoxy compound, a resorthiol type epoxy compound, tetra A polyester resin composition having improved deposition property, characterized in that it is selected from the group consisting of hydroxy bisphenol F-type epoxy compound, cresol novolak-type epoxy compound, phenol novolak-type epoxy compound, cycloaliptic epoxy compound. The reaction catalyst of claim 1, wherein the epoxy and PBT carboxyl end group reaction catalysts comprise phosphoric acid, phosphorous acid, phosphinic acid, lower alkyl esters of phosphonic acid, phosphonium compounds, imidazole compounds, trivalent amines, and tetravalent ammonium salts. Polyester resin composition with improved deposition properties, characterized in that it is selected from.