JPH04202429A - Modifier for polymer - Google Patents

Abstract

PURPOSE:To obtain a modifier which can improve various properties (such as impact resistance and weathering resistance) of a thermoplastic resin by using a specified compound. CONSTITUTION:This modifier comprises a polyglycerol fatty acid ester (e.g. decaglycerol stearic acid monoester).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a polymer modifier that can improve the impact resistance, weather resistance, etc. of thermoplastic resins, particularly resins filled with inorganic fillers. It is.

[Prior Art] It is widely known to blend fillers into thermoplastic resins to improve their properties such as rigidity, impact resistance, weather resistance, dimensional stability, flame retardance, paintability, and adhesiveness. It is being said.

In particular, talc-containing resin compositions are used for automobile parts,
It is widely applied in the field of industrial parts such as home appliance parts, and requires a high level of rigidity-impact strength balance, weather resistance, and good paintability. However, adding inorganic fillers to improve rigidity reduces impact strength.
The rigidity-impact strength balance is greatly deviated, and
No material has been obtained that satisfies good weather resistance and paintability. In order to improve these drawbacks, a method using calcium carbonate with a specific particle size or talc with a specific non-surface area and particle size either alone or in combination (JP-A-57-8235;
No. 042, No. 73033) have been proposed.

Furthermore, methods for using ethylene resins and rubber components in combination (JP-A-57-73034, JP-A-58-32650, JP-A-47044, JP-A-132-036, JP-A-2012-1992)
No. 2132, No. 61-12742, No. 63-
150343, Japanese Patent Application Laid-Open No. 1-271450)
has also been proposed. Furthermore, as a method for adding a specific compound, there is a method that proposes the use of an ethylene oxide surfactant having a specific HLB value (Japanese Patent Laid-Open No. 79043/1983).

However, with these methods, it has not been possible to obtain a material that satisfies the rigidity-impact strength balance that has become particularly demanding in recent years, and also has good weather resistance and paintability.

[Problems to be Solved by the Invention] An object of the present invention is to provide a novel modifier for polymers that can improve various properties such as impact resistance and weather resistance of thermoplastic resins.

[Means for Solving the Problems] The present invention has been made based on the knowledge that the above problems can be effectively solved by using polyglycerin fatty acid esters.

That is, the present invention provides a polymer modifier characterized by containing a polyglycerol fatty acid ester.

The modifier of the present invention contains a polyglycerol fatty acid ester, which is obtained by reacting polyglycerin with a low content of glycerin, diglycerin, and triglycerin with a fatty acid at a predetermined ratio. It is characterized by

Polyglycerin, which is one of the raw materials for the polyglycerin fatty acid ester used in the present invention, is usually produced by adding a small amount of a catalyst such as sodium hydroxide to glycerin, and then adding this to glycerin in an inert gas atmosphere such as nitrogen or carbon dioxide for 180 min.
It is produced by condensation polymerization while removing the produced water at a high temperature above C.

The polyglycerin used has a total amount of glycerin and diglycerin of 30% by weight or less, preferably 20% by weight or less, and preferably has an average degree of polymerization of 3 to 12.

In addition to the linear polyglycerin condensed at the α-position, these polyglycerins may contain branched polyglycerin partly condensed at the α-position, cyclic polyglycerin condensed within the molecule, etc. I do not care.

As the fatty acid which is the other raw material for the polyglycerin fatty acid ester used in the composition of the present invention, a saturated or unsaturated fatty acid having 8 to 24 carbon atoms, preferably 10 to 20 carbon atoms, etc. is used. These fatty acids may be linear or branched, or two or more types may be used in combination. Examples of the fatty acids include decanoic acid, lauric acid, myristic acid,
Examples include palmitic acid, stearic acid, isostearic acid, oleic acid, and lysyllic acid.

The polyglycerin fatty acid ester of the present invention can be produced by direct esterification of polyglycerin and fatty acids, transesterification,
It can also be synthesized by enzymatic methods, etc. Polyglycerin has (n+2) hydroxyl groups relative to the degree of polymerization n of glycerin, and various degrees of esterification are synthesized from 1 mole of fatty acid to (n+2) mole per mole of polyglycerin. be able to. The polyglycerol fatty acid ester of the present invention is composed of monoester (n + 2)
A wide range of esters can be used, but the range from diester to (n+1) ester is preferable.

The modifier of the present invention is 0% per 100 parts by weight of thermoplastic resin.
．． 05 to 5.0 parts by weight, preferably 0.05 to 5.0 parts by weight. The amount is preferably 1 to 3.0 parts by weight. If the amount is less than 0.05 parts by weight, the properties will not be exhibited, and if it is more than 50 parts by weight, the original physical properties of the resin will be deteriorated.

The modifier of the present invention particularly contains 5 to 75% by weight of inorganic filler.
(hereinafter abbreviated as %), preferably 10 to 50%, is particularly effective for modifying thermoplastic resins, and is added in the above ratio. In particular, since the properties of the modifier of the present invention are thought to be exhibited by transferring to and coating the surface of the inorganic filler, it is best to add it as a surface treatment agent in the form of pre-treatment to talc. Although effective, it may be added at any point in the manufacturing process of the resin composition. That is, ordinary kneading machines such as a -screw extruder, twin-screw extruder, Banbury mixer, roll, Brabender plastograph, kneader, etc. can be used, but it is usually kneaded with an extruder etc. to form pellets. After making a compound, the modifier of the present invention is preferably added at the same time as the inorganic filler and the resin at the time of cross-mixing in order to subject it to processing.

In special cases, the inorganic filler and the modifier and resin of the present invention may be directly supplied to various molding machines and molded while being kneaded in the molding machine. In addition, an inorganic filler or an inorganic filler and the additive of the present invention (with various additives as necessary) are mixed and kneaded in a specific resin at a high concentration in advance to make a mustard bath, which is then separately mixed with a resin etc. or an inorganic filler-containing product. It is also possible to perform blend compounding or molding while diluting with resin etc.

The resin to be modified in the present invention is not particularly limited, but includes the following resins. In particular, crystalline propylene homopolymers, copolymers with α-olefins such as ethylene and butylene, and products grafted with unsaturated organic acids and organic silanes, and treatments such as chlorination, oxidation, and sulfonation. There is one that did this. It can also be used for polyamide, polyphenylene ether resin, polyethylene resin, etc.

Examples of the inorganic filler of the inorganic filler-containing resin targeted for modification in the present invention include talc, precipitated calcium carbonate, and the like. There are no particular limitations on the specific surface area, average particle size, particle size distribution, or manufacturing method of the inorganic filler.

In addition to the above-mentioned components, the resin composition to which the modifier of the present invention has been added may contain other additional components, such as various fillers other than those used in the present invention, resins, Rubber components, additives, pigments, etc. can also be added.

Among these, addition of heavy calcium carbonate, barium carbonate, titanium oxide, zinc oxide, and ethylene-propylene copolymer rubber components is preferable because they improve the performance balance.

The method of molding the resin composition containing the modifier of the present invention is not particularly limited, but extrusion molding is suitable for those with a relatively low MFR, and injection molding is suitable for those with a relatively high MFR. Namely, extrusion molding, blow molding, injection molding,
The effects of the present invention are exhibited in molded products regardless of the molding method used, such as sheet molding, vacuum molding, rotational molding, and laminated molding.

[Effects of the Invention] When the modifier of the present invention thus obtained is used, it is possible to not only improve the properties of thermoplastic resins, but when applied to talc-containing propylene polymers, it provides an unprecedented high physical property balance ( In addition to obtaining high rigidity (rigidity - impact strength), the polymer properties of the modifier are utilized to provide good weather resistance, and paintability can be improved without bleed-out. Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 Decaglycerin stearate monoester (Itamoto Pharmaceutical Co., Ltd. SY Glister MSW-75) was added to 95 parts of talc.
0) was added and stirred at high speed with a Henschel mixer to perform surface treatment of the talc. 20 parts of this treated powder was added to 80 parts of polypropylene resin and kneaded at 180° C. for 5 minutes in a lab blast mill.

This composition was press-molded at 200'C to obtain a press plate with a thickness of about 2 mm. The following items were evaluated for this molded body.

Bending test 1! ! : JIS K 7203
According to.

Izot impact test: According to JIS K 7110.

Weather resistance: The above test was conducted after 140 hours of ultraviolet irradiation with a carbon arc.

Examples 2 to 7 As a modifier, decaglycerin stearate decaester (Itamoto Pharmaceutical Co., Ltd. SY Glister DAS-750),
Decaglycerin oleate monoester (MO-75
0), decaglycerin lauric acid monoester (the same ML
-750), decaglycerin capric acid monoester (
The same operation and evaluation as in Example 1 were performed except that MCA-750), hexaglyceryl stearate pentaester (PS-500), and tetraglyceryl stearate pentaester (PS-310) were used.

Comparative Example 1 The same operation and evaluation as in Example 1 were performed using talc that was not treated with a modifier.

Table 1 shows the results of bending tests and isot impact tests of resins prepared by adding the modifier of the present invention.

As shown in Table 1, the use of the modifier of the present invention improved the Izot impact strength and bending rigidity. Furthermore, it can be seen that by using the modifier of the present invention, the decrease in physical properties after irradiation with arc light is smaller than in the additive-free system, and excellent weather resistance is achieved.

Claims (1)

[Claims] A polymer modifier characterized by containing polyglycerol fatty acid ester.