JPH06228441A - Sliding resin composition - Google Patents

Abstract

PURPOSE:To obtain a composition giving a molded article having excellent sliding property and free from clouding and staining tendency and giving a molded article having excellent sliding property even in the case of using a polar resin, etc., by compounding a synthetic resin with a polysiloxane modified with a polyether. CONSTITUTION:The composition contains (A) 100 pts.wt. of a synthetic resin and (B) 0.1-50 pts.wt. of a polysiloxane modified with a polyether. The component A is preferably a crystalline resin such as polypropylene or a polar resin such as acrylic resin. The component B is preferably a polyether-modified polysiloxane having a higher aliphatic terminal group such as the compound of formula. The polyether-modified polysiloxane having a higher aliphatic terminal group can be produced e.g. by the addition reaction of a hydrosilyl- containing polysiloxane with a polyether having a higher aliphatic group on one terminal and an addition reactive unsaturated group on the other terminal in toluene in the presence of platinum catalyst under heating and stirring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition, and more particularly to a slidable resin composition capable of obtaining a resin molded product having excellent slidability.

[0002]

2. Description of the Related Art Conventionally, higher fatty acids and their derivatives have been added as lubricants in order to impart slidability and releasability to synthetic resins. Such higher fatty acid-based lubricants generally have a high compatibility with the resin at high temperatures, and have a characteristic that the compatibility is remarkably reduced at room temperature. The molded product formed by heating and melting has a very high slidability because a film of the lubricant is formed on the surface thereof.

Accordingly, as the above-mentioned lubricant, higher fatty acid ester, higher fatty acid amide, metal salt with higher fatty acid, etc. (referred to as higher fatty acid derivative etc.) is used alone or in combination of two or more kinds, and it is 0.1 to the resin. About 3 parts by weight is added. However, although the above-mentioned lubricant can give high slidability by adding a small amount to the resin, the higher fatty acid derivative as the lubricant is precipitated on the surface of the molded article (called bleed-out) There is a drawback that the surface of the molded product is fogged (called clouding).

Further, since the precipitated higher fatty acid derivative or the like may be powdered and adhere to other molded articles or the like, the molded article may be used especially in the field of precision machinery where contamination is not desired. It had the drawback of being difficult. Furthermore, since higher fatty acid derivatives and the like have poor heat resistance, there is a drawback in that the resins that can be used and the amount added are limited.

On the other hand, in order to make up for the drawbacks of such higher fatty acid derivatives, it has the effect of imparting slidability to various general-purpose resins, and since it is oily at room temperature, it is free from clouding and the like. It has been practiced to add 0.1 to 3 parts by weight of polysiloxane, which is characterized by having better heat resistance than derivatives, to a resin as a lubricant. The polysiloxane used in this case has a wide range of viscosities from low-viscosity to high-viscosity rubber-like, and those having a viscosity suitable for kneading with a resin are appropriately selected and used. Especially in the case of resins that are kneaded at high temperatures,
Phenylmethylpolysiloxane, which has good heat resistance, is used.

[0006]

However, when polysiloxane is used for a crystalline resin, sufficient slidability cannot be imparted depending on cooling conditions when molding the resin. There was a drawback that there were cases. Further, when oil-like polysiloxane is used as a lubricant at room temperature, there is a drawback that the bleed-out oil-like polysiloxane adheres to other molded articles and contaminates the molded articles (called stain resistance). It was Furthermore, since polysiloxane has poor compatibility with highly polar resins (polar resins) such as acrylic resins used for paints, etc.,
It also had the drawback of being difficult to use.

Therefore, as a result of intensive investigations by the present inventors to solve the above-mentioned drawbacks, various polyether-modified polysiloxanes having higher aliphatic groups at the polyether terminals (higher aliphatic-terminated polyether modified polysiloxanes) have been produced. The present inventors have found that extremely good results can be obtained by adding a certain amount to the above resin and reached the present invention. Therefore,
The object of the present invention is to obtain a resin molded product which is excellent in slidability without clouding or contamination, and which has excellent slidability even when a crystalline resin or a polar resin is used. It is to provide a slidable resin composition that can be obtained.

[0008]

The above objects of the present invention are as follows.
This is achieved by a sliding resin composition containing 0.1 to 50 parts by weight of polyether-modified polysiloxane with respect to 100 parts by weight of synthetic resin. The polyether modified polysiloxane used in the present invention has the general formula R ¹ _a R ² _b SiO ^2.
_The higher aliphatic terminal polyether-modified polysiloxane represented by _{(4-ab) / 2} is preferable.

In the above formula, R ¹ is-(CH ₂ ) _p --O--
_{(CH 2 CH 2 O) q} - (CH 2 C (CH 3) HO) r
A polyether group represented by -R ^3, wherein R ¹ formula, R
³ is a substituted or unsubstituted monovalent hydrocarbon group having 8 to 25 carbon atoms, and R ² is a monovalent hydrocarbon group having 1 to 10 carbon atoms. In addition, a is 0.001 ≦ a ≦ 1
And 1.95 ≦ a + b ≦ 3.00, and p
Is an integer of 2 to 4, q and r are integers of 0 or more, and q and r are not 0 at the same time.

The higher aliphatic-terminated polyether-modified polysiloxane used in the present invention is, for example, a hydrosilyl group-containing polysiloxane and an unsaturated compound which has a higher aliphatic group at one end and can undergo an addition reaction at the other end. It can be synthesized by heating and stirring the group-containing polyether with toluene or isopropanol using a platinum catalyst to carry out an addition reaction. In this case, the higher aliphatic group contained in the polyether has 8 to 15 carbon atoms,
Particularly, those having 10 to 25 carbon atoms are preferable.

Specific examples of such higher aliphatic group include stearyl group and oleyl group, and specific examples of the unsaturated group capable of the addition reaction include vinyl group and allyl group. . The copolymerization ratio of ethylene oxide and propylene oxide in the polyether is not particularly limited, and any one can be used. The ethylene oxide or propylene oxide in the polyether may be a homopolymer, and when the resin molded article is required to have water repellency, it is preferable to use a homopolymer of propylene oxide.

The degree of polymerization of the polysiloxane to which the higher aliphatic terminal polyether group is bonded is not particularly limited, but an appropriate degree of polymerization can be selected according to the characteristics of the resin to be added. Generally, higher aliphatic polyether-modified polysiloxanes having a low degree of polymerization have insufficient heat resistance, but the resins to which they are added have good transparency. A polymer with a high degree of polymerization has good heat resistance, but the transparency of the resin to which it is added decreases.

Therefore, in the case of a resin which is kneaded at a relatively low temperature, the polysiloxane has a degree of polymerization of 4 to 50.
In the case of a resin having a degree of kneading, which is kneaded at a relatively high temperature, it is preferable to use a resin having a degree of polymerization of about 50 or more. The upper limit of the degree of polymerization is not particularly limited,
For example, it is possible to use a polymer having a degree of polymerization of about 8,000. From the viewpoint of improving transparency and heat resistance, R ² in the general formula may be a phenyl group.

The higher aliphatic terminal polyether-modified polysiloxane used in the present invention preferably has a high viscosity,
It is particularly preferably 500 cs or more. It is not preferable to use a resin having a low viscosity, because slippage will occur when kneading the resin, making it difficult to knead, and slipping will also occur when molding the resin, resulting in variations in the measuring time of the molded product. . However, when used for an acrylic resin, it is preferable to use one having a low viscosity of 10 to 100 cs.

The amount of the higher aliphatic terminal polyether-modified polysiloxane used in the present invention must be 0.1 to 50 parts by weight with respect to 100 parts by weight of the synthetic resin. From the viewpoint of workability, it is preferably 0.5 to 30 parts by weight. Generally, it is 0.1 to 0.5 parts by weight when used as a mold release agent, and 0.5 to 3 parts by weight for improving the slidability of resin.

When the master pellets are prepared, 50 parts by weight of the higher aliphatic terminal polyether modified polysiloxane may be added to the resin at 50 parts by weight, which is a very high concentration. When added to
Since slippage occurs during kneading and molding of the resin and the workability deteriorates, it is preferably 25 parts by weight or less. Also,
If the amount is less than 0.5 part by weight, sufficient slidability cannot be imparted to the resin.

The higher aliphatic-terminated polyether-modified polysiloxane used in the present invention, even when used alone, is another commonly used dimethylsiloxane from the viewpoint of maintaining slidability and improving abrasion resistance. It can also be used in combination with silicone powder and other lubricants. The synthetic resin used in the present invention is not particularly limited, and a known thermoplastic resin or thermosetting resin can be used.

Specific examples of the above resin include polyethylene resin (PE) and low density polyethylene resin (LD).
PE), high density polyethylene resin (HDPE), polypropylene resin (PP), polystyrene resin (PS), high impact polystyrene resin (HIPS), vinyl chloride resin (PVC), acrylonitrile butadiene styrene copolymer resin (ABS) and acrylonitrile styrene. Polyolefin resin such as copolymer resin (AS), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT) and polycarbonate resin (P
C) Polyester resin such as Nylon 6, Nylon 66
Polyamide resin (PA), polyacetal or polyoxymethylene, and polyoxymethylene resin (POM) such as a copolymer of each of these.

Among the above resins, the present invention provides a polypropylene resin, a polyethylene resin or a copolymer thereof (for example, a polyethylene-polypropylene copolymer).
It is particularly effective for crystalline resins such as and polar resins such as acrylic resins and polyoxymethylene resins.

[0020]

The slidable resin composition of the present invention contains a higher aliphatic terminal polyether-modified polysiloxane as a component, which can easily adjust appropriate viscosity, heat resistance and slidability imparting property. In addition to being applicable to a resin having a low temperature during kneading and a resin having a high temperature, the molded product has no fog or contamination and is excellent in slidability.

Conventionally, addition of polysiloxane such as dimethylpolysiloxane to polypropylene resin has not been able to impart slidability to the resin, but in the present invention, polypropylene is used as the resin. Even when the resin is used, sufficient slidability can be imparted to the resin molded product. Further, when the resin used is an acrylic resin and it is used for a paint, the compatibility between the higher aliphatic terminal polyether modified polysiloxane and the acrylic resin is good, so the paint is modified. be able to.

[0022]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1. A composition obtained by adding 2 parts by weight of a higher aliphatic terminal polyether-modified polysiloxane represented by the following chemical formula 1 to 100 parts by weight of a polypropylene resin is used.
The mixture was melt-kneaded under the condition of 0 ° C. and injected using an injection molding machine to form a plate of 100 mm × 250 mm × 1 mm. The results of visually observing the color, transparency and dusting state of the obtained molded product (referred to as a test piece) are as shown in Table 1.

[Chemical 1]

Immediately after the test piece was obtained and after 7 days, the test piece was placed on a polypropylene plate and 200 gf was placed on it.
Was applied and the static friction coefficient was measured using an autograph under the condition of a pulling speed of 5 mm / min (JIS.
According to K 7125). The results are as shown in Table 1. Further, the above-mentioned higher aliphatic terminal polyether-modified polysiloxane was subjected to a heating weight loss test (TGA test) in the range of 30 to 300 ° C. under the conditions of a temperature rising rate of 5 ° C./min and a nitrogen stream. The results are shown in Table 2.

Example 2. Example 1 using the higher aliphatic terminal polyether modified polysiloxane represented by the following chemical formula 2
A test piece was prepared in exactly the same manner as in Example 1 and tested in exactly the same manner as in Example 1. The results are as shown in Tables 1 and 2.

[Chemical 2]

Example 3. Example 1 using a higher aliphatic terminal polyether modified polysiloxane represented by the following chemical formula 3
A test piece was prepared in exactly the same manner as in Example 1 and tested in exactly the same manner as in Example 1. The results are as shown in Tables 1 and 2.

[Chemical 3]

Example 4. Example 1 using a higher aliphatic terminal polyether modified polysiloxane represented by the following chemical formula 4
A test piece was prepared in exactly the same manner as in Example 1 and tested in exactly the same manner as in Example 1. The results are as shown in Tables 1 and 2.

[Chemical 4]

Comparative Example 1. A test piece was prepared in the same manner as in Example 1 except that the higher aliphatic-terminated polyether-modified polysiloxane was not used, and the test was performed in the same manner as in Example 1. The results are as shown in Tables 1 and 2.

Comparative Example 2. Instead of the higher aliphatic terminal polyether modified polysiloxane, the viscosity at 25 ° C is 1
A test piece was prepared in the same manner as in Example 1 except that dimethyl siloxane of 10,000 cs was used, and the test was conducted in the same manner as in Example 1. The results are as shown in Tables 1 and 2.

Comparative Example 3. A test piece was prepared in the same manner as in Example 1 except that oleic acid amide was used instead of the higher aliphatic-terminated polyether-modified polysiloxane, and the test was performed in the same manner as in Example 1. The results are shown in Table 1 and Table 2.
As shown in.

Comparative Example 4. A test piece was prepared in the same manner as in Example 1 except that the polyether-modified silicone represented by the following chemical formula 5 was used in place of the higher aliphatic-terminated polyether-modified polysiloxane. Tests were conducted. The results are as shown in Tables 1 and 2.

[0032]

[Table 1]

[0033]

[Table 2]

[Chemical 5]

Claims (3)

[Claims] 1. A slidable resin composition comprising 0.1 to 50 parts by weight of a polyether modified polysiloxane with respect to 100 parts by weight of a synthetic resin. 2. The sliding resin composition according to claim 1, wherein the polyether-modified polysiloxane is a modified polysiloxane represented by the general formula R ¹ _a R ² _b SiO _{(4-ab) / 2} . in the formula, R _{^1, - (CH 2) p -O-} (CH 2 CH 2 O)
_{q - (CH 2 C (CH} 3) HO) a polyether group represented by _r -R ^3, wherein R ¹ formula, R ³ has 8 carbon atoms
To 25, a substituted or unsubstituted monovalent hydrocarbon group, R ² is a monovalent hydrocarbon group having 1 to 10 carbon atoms, and a is 0.
001 ≦ a ≦ 1, and 1.95 ≦ a + b ≦ 3.00,
p is an integer of 2 to 4, q and r are integers of 0 or more, and q and r are not 0 at the same time. 3. The synthetic resin is polypropylene.
Or the slidable resin composition according to item 2.