JPS6217620B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a glass fiber reinforced resin composition, and more particularly to a glass fiber reinforced aromatic polycarbonate resin composition having excellent physical properties, particularly impact resistance. Aromatic polycarbonate resins are widely used as engineering plastics. In addition, glass fiber-reinforced aromatic polycarbonate resin compositions, which are blended with glass fibers to take advantage of their excellent heat resistance and reduce molding shrinkage and thermal expansion coefficients, are widely used as materials for molding heat-resistant precision molded products. ing. Even if there is a glass fiber-reinforced aromatic polycarbonate resin composition that can produce molded products with excellent heat resistance and dimensional accuracy, there remains the problem that impact resistance is lower than that of non-reinforced aromatic polycarbonate resins. There is.
Therefore, it is desired to improve the heat resistance of glass fiber reinforced aromatic polycarbonate resin compositions. As a result of repeated studies by the present inventor on a method for maintaining the advantages of glass fiber-reinforced aromatic polycarbonate resin compositions and improving impact resistance,
The inventors have discovered that the above object can be achieved by adding a small amount of alkyl phosphite and polyethylene wax to a glass fiber-reinforced aromatic polycarbonate resin composition, and have arrived at the present invention. That is, the present invention uses 0.01 to 0.5 parts by weight of a trialkyl phosphite made of aliphatic alkyl having 2 to 30 carbon atoms per 100 parts by weight of a resin composition made of 35 to 97% by weight of aromatic polycarbonate resin and 3 to 65% by weight of glass fiber. Weight part and polyethylene wax
It relates to a glass fiber reinforced resin composition containing 0.1 to 3 parts by weight. The aromatic polycarbonate resin used in the present invention is an aromatic polycarbonate produced from an aromatic dihydroxy compound and a carbonate precursor by a solution method or a melt method. Representative examples of the aromatic dihydroxy compounds are as follows. That is, 2,2 bis(4-hydroxyphenyl)propane [bisphenol A], bis(4-hydroxyphenyl)propane [bisphenol A],
-hydroxyphenyl)methane, 2,2bis(4
-hydroxy-3-methylphenyl)propane,
Examples include 2,2bis(4-hydroxy-3,5-dibromphenyl)propane, bis(4-hydroxyphenyl)sulfide, and bis(4-hydroxyphenyl)sulfone. Preferred is an aromatic polycarbonate resin whose main raw material is a bis(4-hydroxyphenyl)alkane compound, particularly bisphenol A. The aromatic polycarbonate resin used in the present invention is produced by reacting the aromatic dihydroxy compound with a carbonate precursor, but the aromatic dihydroxy compounds may be used alone or in combination of two or more. Furthermore, two or more of the aromatic polycarbonates thus obtained may be used in combination. The carbonate precursor may be carbonyl halide, diallyl carbonate, haloformate, or the like. Typical examples include phosgene, diphenyl carbonate,
It is a dichloroformate of an aromatic dihydroxy compound or a mixture thereof. Aromatic polycarbonates are usually produced by a solution method from an aromatic dihydroxy compound and phosgene, or by a melt method from an aromatic dihydroxy compound and diphenyl carbonate. The molecular weight of the aromatic polycarbonate resin used is generally 10,000~
100,000, preferably 15,000 to 60,000. When producing aromatic polycarbonate resins having these molecular weights, an appropriate molecular weight regulator, a catalyst for promoting the reaction, or a branching agent for improving processability may be used. In addition, suitable stabilizers such as antioxidants, heat stabilizers, ultraviolet absorbers, dyes and pigments, flame retardants, antistatic agents, mold release agents, blowing agents, etc. may be added to the aromatic polycarbonate resin depending on the purpose. There is no problem even if you do. Further, fillers such as glass powder and inorganic fillers can also be used if necessary. Furthermore, plasticizers that improve the processability of aromatic polycarbonate resins can also be used. On the other hand, the glass fibers used in the resin composition of the present invention are not particularly limited as long as they are generally used in aromatic polycarbonate resins. The glass fiber may be a chopped strand or a roving strand. The length of glass fiber in pellets is usually 0.1~
It is in the range of 8m/m. Also, the glass fiber diameter is 6 to 30
μ, generally 10 to 20μ is used. Furthermore, the glass fibers may be surface-treated to increase their affinity with the aromatic polycarbonate resin. The content of glass fiber is preferably 3 to 65% by weight based on the total amount with the aromatic polycarbonate resin. If it is less than 3% by weight, the reinforcing effect of the glass fiber is small, and if it is more than 65% by weight, it becomes difficult to mold, which is not preferable. A particularly preferred glass fiber content is between 5 and 40% by weight. Furthermore, the smaller the glass fiber content, the more remarkable the effect of improving impact resistance. Any commercially available trialkyl phosphite composed of aliphatic alkyl having 2 to 30 carbon atoms can be used in the present invention. Examples include Kirex-O, -L, -S, -2300L (manufactured by Sakai Kagaku). The amount of aliphatic trialkyl phosphite added to the resin composition is 0.01~
It is 0.5 PHR. When the aliphatic trialkyl phosphite is used in combination with a polyethylene wax, the effect of improving the impact resistance of the present invention is observed. The polyethylene wax used in the present invention is low molecular weight polyethylene or low molecular weight polyethylene that has been partially hydrophilized, and has a molecular weight of 1,500 to 1,500.
It is about 10,000 waxes. These polyethylene waxes include, for example, Hoechst wax
These are commonly commercially available as PA190, PA520 (Hoechst), and Hiwax (Mitsui Petrochemicals). The amount of polyethylene wax added to the resin composition is 0.1 to 3 PHR. As mentioned above, when polyethylene wax was used in combination with aliphatic trialkyl phosphite, the effect of improving the impact resistance of the present invention was observed, but when each was added alone, the effect did not appear or it only improved slightly. It just shows the effect. It goes without saying that the effect produced by the combined use of both is a completely unexpected and unique phenomenon, which led to the completion of the present invention. When producing the glass fiber reinforced resin composition of the present invention, any known method can be used and no special equipment is required. For example, a method in which a premix of aromatic polycarbonate resin, glass fiber, trialkyl phosphite, and polyethylene wax is heated and mixed in a single-screw or twin-screw extruder, a Banbury mixer, a heated roll, etc., and pelletized; A method of directly molding with an injection molding machine; a method of adding trialkyl phosphite and a polyethylene wax to a glass fiber reinforced aromatic polycarbonate resin; or a method of adding glass fiber to a mixture of an aromatic polycarbonate resin, a trialkyl phosphite and a polyethylene wax. Although there are various combinations such as the method of adding , there is no problem in producing the glass fiber reinforced resin composition of the present invention by any of the methods, and the effect of improving impact resistance is expressed. Conventional additives may be added to the glass fiber reinforced resin composition of the present invention in amounts necessary to achieve their effects. Further, resins containing polyethylene or rubber components may be included to the extent that the essential properties of the aromatic polycarbonate resin are not impaired. Molded products obtained using the glass fiber-reinforced resin composition of the present invention have excellent impact resistance in addition to the excellent properties of ordinary glass fiber-reinforced aromatic polycarbonate resins, and therefore have excellent rigidity and dimensional stability. It is a useful resin composition that is widely used in fields where impact resistance is required. The effects of the present invention will be explained below with reference to Examples, but the present invention is not limited thereto. Incidentally, the parts in the examples indicate parts by weight, and unless otherwise specified, the impact values indicate 1/8 inch thick isonotched impact Kgfcm/cm. Example 1 Trioctyl phosphite (Kyrex-
O: Sakai Chemicals) 0.05PHR and polyethylene wax (Hiwax 400P; manufactured by Mitsui Petrochemicals) 0.7PH
R was added and pelletized at an extrusion temperature of 280°C.
The pellets thus obtained were dried at 120°C for 6 hours and then injection molded at 300°C to prepare test pieces for impact value measurement. Trioctyl phosphite only 0.05 for comparison
PHR additive products, polyethylene wax only 0.7PH
Test pieces were prepared in the same manner as above for the R-added product and the R-additive-free product. The results of measuring the impact value of the test piece, which was conditioned to 23°C and 50% RH, are as follows.

[Table] It can be seen that the combined effect of trialkyl phosphite and polyethylene wax is remarkable. Example 2 In the same manner as in Example 1, impact values were measured for glass fiber reinforced aromatic polycarbonate resin compositions to which various aliphatic trialkyl phosphites and polyethylene wax (HIWAX 400P) were added. The results are shown below.

[Table] Example 3 In the same manner as in Example 1, test pieces were prepared for glass fiber-reinforced aromatic polycarbonate resins with different glass fiber contents, and the impact values were measured.
The results are shown below.

[Table] Example 4 Test pieces were prepared for colored products containing pigments in the same manner as in Example 1, and impact values were measured. The results are shown below.

[Table] Example 5 0.05 PHR of trioctyl phosphite and 0.7 PHR of Hiwax 410P were added to a polycarbonate resin containing 30% glass fiber, and a test piece was immediately prepared using an injection molding machine without pelletizing, and the impact value was measured. However, it was 20.3. Comparative Example In Example 1, trioctyl phosphite
When 0.005PHR and Hiwax 400 0.05PHR were added, the impact value was 11.3. Similarly, trioctyl phosphite 0.6PHR and Hiwax
When 400P3.5PHR was added, extrudability was poor and pelletization was difficult.

Claims (1)

[Claims] 1. 0.01 to 0.5 parts by weight of a trialkyl phosphite consisting of aliphatic alkyl having 2 to 30 carbon atoms and polyethylene based per 100 parts by weight of a composition consisting of 35 to 97% by weight of aromatic polycarbonate resin and 3 to 65% by weight of glass fiber. A glass fiber reinforced resin composition containing 0.1 to 3 parts by weight of wax.