JPH0699590B2 - Lubricant for resin processing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lubricant for resin processing, characterized by using at least one compound represented by the following general formula (1), and the lubricant for resin processing according to the present invention: Includes general-purpose plastics such as vinyl chloride resin and polyethylene resin,
It can be used for molding processing of a wide range of resins, including engineering resins such as polycarbonate resins, polyamide resins and polyacetal resins, and in any case, for preventing adhesion during processing, reducing friction resistance, or lowering the viscosity of molten resin. Shows excellent effects.

(However, in the above general formula (1), R1 is the following general formula (2)
To (5), R2 represents a structure represented by the following general formula (6) or (7), respectively, and m is 1
To 4 and n represents an integer of 5 to 22. ) R1: CnH2n + 1CONH (2): CnH2n + 1NHCO (3): CnH2n + 1OCO (4): CnH2n + 1 (5) R2: CnH2n + 1 (6) H (7) Conventional technology and problems Currently used resins are thermoplastic resins and Roughly divided into thermosetting resins. In order to mold and process these resins into a shape such as a film, a pipe, a tube, a container, or a part of a drive section, it is necessary to heat the resin at a temperature higher than its melting temperature and perform pressure molding. Various machines such as an injection molding machine, a calender, an extruder, or a compression molding machine are used for the molding process. In any case, the resin is kept in a heated state and contacts the metal surface of the molding machine for a certain period of time. It often happens that it sticks to the metal surface and cannot be molded,
Alternatively, a problem occurs that the container does not separate from the container after stamping. It is also known that when the resin adheres to a heated metal surface and stays in the molding apparatus for a long time, the resin is likely to deteriorate or decompose.

Various processing aids are used for the purpose of improving the moldability of such resins and preventing problems during production. Among these processing aids, one that plays a particularly important role is a lubricant, which is roughly classified into an internal lubricant and an external lubricant according to its mechanism of action.

The internal lubricant reduces the viscosity of the molten resin and reduces the applied shearing force to suppress the generation of frictional heat, while the external lubricant forms a lubricating layer at the interface between the hot metal surface of the molding machine and the molten resin to provide adhesion. It works to prevent it. Further, the lubricant used in the actual resin processing is required to have the following various characteristics in addition to these basic characteristics. That is,
At the time of resin molding, it is required that it has excellent lubricity and dispersibility in the resin, and that it does not impair the heat resistance and gelation property of the resin. It is necessary not to adversely affect the color tone and transparency of the resin, or the physical properties of the resin such as the softening point, impact resistance, weather resistance, and electrical characteristics. In addition, recently, the problems of environmental pollution and toxicity to the human body have been highlighted, and high safety is also required for those added to resins.

However, conventionally used resin molding lubricants, for example, metal soaps, organic tin fatty acid salts, fatty acid esters, fatty acid amides, higher ketones, paraffin wax,
It is known that when the microwax or the like is used alone, the above-mentioned required characteristics cannot be satisfied and various problems are caused. For example, in the case of stearic acid which is often used as an external lubricant in the molding process of a thermoplastic resin, stearic acid cannot evaporate at a high temperature so that sufficient lubricity cannot be maintained, resulting in a decrease in workability, or, It has the drawback that it cannot be applied to resins that require high processing temperatures. Further, montan wax or paraffin wax exhibits excellent lubricity even at a relatively high temperature, but has a drawback that the transparency of the resin is impaired when the amount added is increased. Recently, silicone-based and fluorine-based lubricants with extremely high lubricity have also been devised and partially used, but such lubricants generally have poor compatibility with resins, resulting in reduced strength of products. In many cases, the range of use is limited.

Therefore, when actually molding a resin, it is necessary to combine various lubricants intricately according to the temperature and pressure during the resin processing, the characteristics of the resin, etc. The actual situation is that they bear a significant cost burden.

Means for Solving the Problem In studying various derivatives of amino acids, the present inventors have
Surprisingly, the compound represented by the following general formula (1) has high lubricity in a wide temperature range from low temperature to high temperature, has excellent dispersibility and compatibility with resins, and has a wide range of resins from general-purpose resins to engineering resins. The present invention has been completed by discovering that it becomes a new internal or external lubricant applicable to.

(However, in the above general formula (1), R1 is the following general formula (2)
To R5 each represent a structure represented by the following general formulas (6) to (7), m represents an integer of 1 to 4, and n represents an integer of 5 to 22. ) R1: CnH2n + 1CONH (2): CnH2n + 1NHCO (3): CnH2n + 1OCO (4): CnH2n + 1 (5) R2: CnH2n + 1 (6) H (7) Each of the above compounds in the present invention can be easily obtained by a known reaction. You can Examples of the method are Japanese Patent Publication No. 51-28610, Japanese Patent Publication No. 59-176377, and Japanese Patent Application No. 60-1420.
83, Japanese Patent Application No. 60-296264, Japanese Patent Application No. 61-147707. However, the present invention does not particularly define the method for synthesizing the compound represented by the above general formula (1), and other methods. There is no problem even if it is synthesized by the method.

Specific examples of the compounds obtained by these methods are Nω-long chain acyl basic amino acid, α-amino long chain fatty acid, acidic amino acid-ω-long chain amide, N-alkyl acidic amino acid-ω-length. Chain amides, N-alkyl acidic amino acids-ω-long chain esters and the like. More specifically exemplifying these, as the basic amino acid constituting the Nω-long-chain acyl basic amino acid, lysine,
Ornithine, α, β diaminobutyric acid and the like are used without distinction between optically active substances and racemates, and examples of the acyl group include capryloyl, caprinoyl, lauroyl, myristoyl, palmitoyl, stearoyl, cocoyl, hardened tallow acyl, behenoyl and the like. To be Also, α-
Specific examples of the amino long-chain fatty acid include α-aminocaprylic acid, α-aminocapric acid, α-aminolauric acid, α-aminomyristic acid, α-aminostearic acid, α-aminoicosanoic acid, α-aminodocosane. Acid etc. are mentioned. Further, as acidic amino acids constituting the acidic amino acid-ω-long chain amide, N-alkyl acidic amino acid-ω-long chain amide, and N-alkyl acidic amino acid-ω-long chain ester, aspartic acid, glutamic acid, α- Aminoadipic acid and the like are used without distinction between optically active form and racemic form, and amidation or N-
As the long-chain amine used for alkylation, octylamine, decylamine, laurylamine, myristylamine, stearylamine and the like, and as the long-chain alcohol used for esterification, octanol, decanol, lauryl alcohol, myristyl alcohol,
From 8 carbon atoms including stearyl alcohol
Twenty-two long chain amines or long chain alcohols are used.
The long-chain alkyl group in the above compounds exemplified as the compound represented by the general formula (1) may be a linear or branched alkyl group.

On the other hand, these lubricants according to the present invention include urea resins, melamine resins, polyethylene resins, polypropylene resins, polystyrene resins, polyvinyl chloride resins, methacrylic resins, and other general-purpose resins, phenol resins, unsaturated polyester resins, ABS resins, Engineering resins such as epoxy resin, polyacetal resin, nylon resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene oxide resin, polyphenylene sulfide resin, polysulfone resin, etc., further diallyl phthalate resin, silicone resin, polyimide resin, bismaleimide triazine Resin, polyamide imide resin, polyamide bismaleimide resin, olefin vinyl alcohol copolymer, polyoxybenzylene resin,
It can be applied to a wide range of resins including special engineering resins such as polyether sulfone resin and polyarylate resin.

With respect to 100 parts of these resins, the lubricant for resin processing according to the present invention exerts a sufficient effect at an addition amount of 0.05 to 5 parts, preferably 0.1 to 3 parts. The lubricant of the present invention provides sufficient lubricity by itself, but it can be used in combination with a conventionally used lubricant.

EFFECTS OF THE INVENTION The lubricant of the present invention has excellent lubricity, and has an injection molding machine,
When using any resin molding machine such as a calender molding machine, an extruder or a compression molding machine, it prevents the resin from sticking to the metal surface and cannot be molded, or it does not separate from the container after stamping. It is highly effective in preventing troubles at times. It is also possible to reduce the viscosity of the molten resin to suppress heat generation due to friction, and to suppress the deterioration and decomposition of the resin caused by the resin adhering to the heated metal surface and staying in the molding apparatus for a long time. Further, it also has a kind of releasing agent-like effect of enhancing the releasability from the mold after resin molding.

Further, when the lubricant of the present invention is added to the resin, it is not limited to merely providing the lubricity, it prevents the plate-out, improves the dispersibility of the pigment and the filler, and lowers the water absorption rate of the resin to improve the electric insulation. It can also have various secondary effects, such as

Next, the content of the present invention will be described in more detail with reference to examples.

Example 1 Table 1 shows the maximum torque and steady torque when a hard vinyl chloride resin was kneaded with a Labo Plastomill according to the following formulation.

Prescription Polyvinyl chloride resin (Average degree of polymerization: 720) 100 parts Calcium stearate 1 part Zinc stearate 1 part Each lubricant 0.1 part Labo Plastomill conditions Kneading chamber temperature 170 ℃ Kneading blade rotation speed 40rpm Resin amount 60g Table-1 Maximum lubricant torque Steady state torque-free 444 (kg / cm) 319 (kg / cm) (1) 350 268 (2) 389 319 (3) 383 322 (1) Example of the present invention: N-lauryl aspartic acid-β-lauryl ester (2) ) Comparative example: WAX-OP Hoechst fatty acid ester partially saponified product (3) Comparative example: Hiwa × 200P Mitsui Petrochemical low molecular weight polyethylene As shown in Table 1, the lubricant according to the present invention was used for comparison. It shows higher slipperiness than that of the one and can reduce the torque during kneading.

The lubricant according to the present invention was also superior in the effect of preventing the resin from adhering when the resin was taken out after the kneading.

Example 2 Table-2 shows the maximum torque and steady torque when the ABS resin was kneaded under the following Labo Plastomill conditions.

Labo Plastomill conditions Kneading chamber temperature 200 ℃ Kneading blade rotation speed 40rpm Resin amount 60g Lubricant 0.3g Table-2 Lubricant maximum torque Steady torque No additive 385 (kg / cm) 264 (kg / cm) (1) 350 238 (2) ) 361 219 (3) 368 243 (1) Example of the present invention: N-lauryl aspartic acid-β-lauryl ester (2) Example of the present invention: N-2-ethylhexyl aspartic acid-β-2-ethylhexyl ester (3) Comparison Example: Microcrystalline wax Note) ABS: Virgin resin Nippon Synthetic Rubber Co., Ltd. As shown in the results of Table-2, the lubricant of the present invention exerts an excellent effect also on ABS resin.

Further, as in the case of the hard vinyl chloride resin, the peelability of the resin from the molding machine was superior when the lubricant of the present invention was used, as compared with the comparative example.

Example 3 Table 3 shows the maximum torque and steady torque when the modified PPO resin was kneaded under the following Labo Plastomill conditions.

Labo Plastomill conditions Kneading chamber temperature 270 ℃ Kneading blade rotation speed 40rpm Resin amount 60g Lubricant 0.6g Table-3 Lubricant maximum torque Steady torque No additive 254 (kg / cm) 163 (kg / cm) (1) 229 122 (2) ) 225 131 (3) 222 135 (4) 243 143 (1) Example of the present invention: N-lauryl aspartic acid-β-lauryl ester (2) Example of the present invention: Nω-lauroyl lysine (3) Example of the present invention: α- Aminopalmitic acid (4) Comparative example: Montan wax Note) Modified PPO: Nonyl 115J Engineering Plastics Co., Ltd. As shown in the results of Table-3, the lubricant of the present invention is modified PPO.
It also has an excellent effect on resins.

Further, as in the case of the hard vinyl chloride resin, the peelability of the resin from the molding machine was superior when the lubricant of the present invention was used, as compared with the comparative example.

Claims (1)

[Claims] 1. A lubricant for resin processing, comprising at least one kind of compounds having an amino acid skeleton represented by the following general formula (1). (However, in the above general formula (1), R1 is the following general formula (2)
To (5), R2 represents a structure represented by the following general formula (6) or (7), respectively, and m is 1
To 4 and n represents an integer of 5 to 22. ) R1: CnH2n + 1CONH (2): CnH2n + 1NHCO (3): CnH2n + 1OCO (4): CnH2n + 1 (5) R2: CnH2n + 1 (6) H (7)