JPS5931535B2 - Lubricants for thermoplastic synthetic resins - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricant for thermoplastic synthetic resins comprising derivatives such as lanolin fatty acids and lanolin alcohols.

When thermoplastic synthetic resins are subjected to molding processes such as extrusion and calendering, these resins stick to the metal surface of the processing machine, making fluidity difficult.

Therefore, when molding these resins, lubricity is added,
Furthermore, lubricants have been added to prevent blocking properties of the product. Conventionally used lubricants include acid amides such as stearamide, erucamide, and oleic acid amide, fatty acids such as stearic acid and erucic acid, and their metal salts such as calcium and zinc, other higher alcohols, and butyl stearate. There are esters such as, paraffin, carnauba wax, waxes such as beeswax, etc.

Among these additives, fatty acid amide is considered to be the most effective, and is mainly used in polyolefin resins that particularly require lubricity.

The sliding properties are insufficient except for acid amide, and acid amide is generally used when molding polyolefin resins, especially when molding films and sheets.

However, conventionally used acid amides, such as stearamide and erucamide, have the drawback of severe blooming, loss of initial coloring and transparency, and whitening phenomenon. Recently, ethylene/vinyl acetate copolymers have been developed into films that have lower chargeability and superior transparency than polyethylene, polypropylene, etc., and also have good cold resistance, toughness, impact resistance, chemical resistance, and heat sealability. It has attracted attention as a molding material for sheets, etc., and is being developed for various uses.

This copolymer has particularly strong stickiness and is difficult to fluidize, so conventionally used lubricants will reduce its lubricating performance, cause whitening, similar to that seen with polyolefin resins, and reduce transparency. It will be severely inhibited and its value as a product will be lost. As a result of intensive research to eliminate the defects of these conventional products, the present inventors have found that lanolin fatty acid amide, lanolin fatty acid polyhydric alcohol ester, or polyoxyethylene lanolin alcohol ether, which is a derivative of lanolin fatty acid and lanolin alcohol, can be synthesized by thermoplastic synthesis. It has an extremely lubricating effect not only on resins, especially polyvinyl chloride, polyethylene, polypropylene, and their copolymers, but also on extremely viscous ethylene-vinyl acetate copolymers, and because of its good compatibility, it inhibits transparency. We have discovered that this is a new lubricant that does not

The lanolin derivatives used in the present invention include (a) lanolin fatty acid amides such as lanolin fatty acid amide, lanolin fatty acid monoethanolamide, lanolin fatty acid diethanolamide, (l) monoglycerin lanolin fatty acid monoester, monoglycerin lanolin fatty acid diester, Lanolin fatty acid polyhydric alcohol esters such as diglycerin lanolin fatty acid monoester, diglycerin lanolin fatty acid diester, sorbitan lanolin fatty acid monoester, sorbitan lanolin fatty acid diester, and (c) ethylene oxide polymerization degree of 5 mol, 10 mol, 2
There are polyoxyethylene lanolin alcohol ethers corresponding to 0 mol, 40 mol, etc. These lanolin derivatives are substances obtained by hydrolyzing lanolin and synthesizing purified and separated lanolin fatty acids and lanolin alcohol by conventional methods.

The raw material lanolin has a very complex composition, and the fatty acid components include normal fatty acids C, O ~ 32 ~ 7%, iso fatty acids ClO ~ 32 ~ 23%, and anteiso fatty acids C9.
~31 approx. 30%, hydroxy fatty acids approx. 35%, other fatty acids approx. 5%, alcohol components include aliphatic alcohols Cl3~33 approx. 22%, cholesterol C27 approx. 3
7%, about 39% triterpene alcohol C3O, and about 2% other alcohols. In addition to the above-mentioned polyvinyl chloride, polypropylene, polyethylene, and ethylene monovinyl acetate copolymer, thermoplastic synthetic resins that can be applied in the present invention include polyvinyl bromide, polyvinyl fluoride, polyvinyl chloride, polyvinyl acetate, and chlorine. Chlorinated polyethylene, chlorinated polypropylene, brominated polyethylene, chlorinated rubber,
Vinyl chloride monovinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer, vinyl chloride-isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, Vinyl chloride-styrene monomaleic anhydride terpolymer, vinyl styrene chloride-acrylonitrile copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isopyrene copolymer, vinyl chloride monochlorinated propylene copolymer, chloride Vinyl monochloride vinylidene monoacetate terpolymer, vinyl chloride-acrylic acid ester copolymer, vinyl chloride-maleic acid ester copolymer, vinyl chloride-methacrylic acid ester copolymer, vinyl chloride-acrylonitrile copolymer , halogen-containing synthetic resins such as internally plasticized polyvinyl chloride, polyolefins such as polybutyne, α-olefin polymers such as poly-3-methylbutene, or polyolefins such as ethylene-propylene copolymers, and copolymers thereof, polystyrene,
Acrylic resin, copolymer of styrene with a monomer (such as nitrile), acrylonitrile-butadiene-styrene copolymer, arylate ester-butadiene-styrene copolymer, methacrylate ester-butadiene-styrene copolymer, or Examples include blends, block copolymers, graft copolymers, etc. of these resins.

The lanolin derivative of the present invention has extremely good compatibility with thermoplastic synthetic resins, and the resin and lanolin derivative can be easily homogenized by melting, and even more quickly by adding a slight mixing or kneading operation.

Moreover, no matter what proportion it is added, it does not cause whitening phenomenon and does not impair transparency. Since the lubricating performance is sufficiently effective with a small amount of additive, the locking property caused by blooming that is seen in conventional lubricants is reduced, and the thermal stability and
Excellent transparency and initial coloring.

Furthermore, it exhibits a sufficient effect when used at 1% by weight or less, preferably at 0.5% or less, even for ethylene-vinyl acetate copolymer resins, which have extremely high viscosity and have insufficient lubricating properties with conventional lubricants.

The reason why the above-mentioned lanolin derivatives have excellent lubricity is that the compositions of lanolin fatty acids and lanolin alcohol are extremely complex.
Lanolin fatty acids are a mixture containing a large amount of branched fatty acids,
Furthermore, lanolin alcohol is a mixture containing steroids as main components, and both have a low eutectic point, making kneading easier and oozing out during molding.

In addition, it does not contain lanolin fatty acids or lanolin alcohol co-unsaturates, and has a high average carbon number of around 21, so it has good thermal stability, which is thought to be because the crystallized particles have a fine structure. Even when the lubricant of the present invention is added, the physical strength such as flexibility, elongation, tear strength, etc. inherent to the resin is not impaired.

Also, if necessary, pigments, antistatic agents, antifogging agents, surface treatment agents, flame retardants, heat stabilizers, light stabilizers, ultraviolet absorbers, photodeteriorating agents, other lubricants, etc. may be added without causing any problems. Does not cause Representative examples of the present invention will be shown below.

(Parts and % are based on weight) Example 1 100 parts of polyvinyl chloride resin (manufactured by Denka Vinyl SSllO Denki Kagaku Co., Ltd.), 50 parts of dioctyl phthalate, 0.5 part of stabilizer barium stearate, 0.5 part of calcium stearate, A predetermined amount of the lubricant of the present invention was added as shown in Table 1, and the temperature was heated to 155°C using a calendar roll (two rolls).
The mixture was kneaded for 10 minutes.

Comparative studies were also carried out using blank formulations containing no lubricant and commercially available lubricants containing stearic acid, stearamide, and butyl stearate. The evaluation was made by evaluating the lubricity during roll kneading, and by pressing the sheet obtained by the roll at 1500C for 10 minutes at 200k9/CTil to evaluate transparency and whitening property.

The evaluation was based on the average of the judgments made by five workers and was based on the following criteria. Smoothness ◎ Excellent ○ Good × Poor Transparency ◎ Excellent ○ Good × Poor Bloom property ◎ Excellent ○ Good × Poor The results are shown in Table-1.

Example 2 Polyethylene resin (Yukalon YF-30 manufactured by Mitsubishi Yuka Co., Ltd.)
A predetermined amount of the lubricant of the present invention as shown in Table 2 was added to 100 parts, and the mixture was kneaded at 160°C for 10 minutes using kneading rolls (two rolls).

In addition, a blank formulation without a lubricant and a formulation containing stearamide, oleic acid amide, and stearic acid as commercially available lubricants were compared and studied.

Judgment was made by evaluating the lubricity during roll kneading, and the sheet obtained by roll was evaluated with 160 ratings C10 minutes 200 kg/? It was pressed and evaluated for transparency and whitening property.

The evaluation method is the same as in Example 1. The results are shown in Table 2. Example 3 A predetermined amount of the lubricant of the present invention as shown in Table 3 was added to 100 parts of ethylene monovinyl acetate copolymer resin (VE63l manufactured by Toyo Soda Co., Ltd.) and kneaded for 10 minutes at 160° C. using a kneading roll.

Comparative studies were also conducted using a blank formulation without a lubricant and a commercially available lubricant containing stearamide, erucamide, oleic acid amide, and hydroxystearamide.

Claims (1)

[Claims] 1. A lubricant for thermoplastic synthetic resins consisting of lanolin fatty acid amide, lanolin fatty acid polyhydric alcohol ester, or polyoxyethylene lanolin alcohol ether.