Plastic composite lubricating agent and preparation method thereof

Abstract

The invention belongs to the technical field of plastic auxiliaries and specifically relates to a plastic composite lubricating agent and a preparation method thereof. The plastic composite lubricating agent comprises a spherical or near-spherical inorganic powder kernel with lubricating property and a graft-modified polymer wax housing coated on the outer layer. The preparation method comprises the following process steps of: a) performing graft modification: uniformly mixing polymer wax, grafting monomers, an initiator and metal soap, and then performing modification and granulation througha screw extruder; and b) coating powder: using a coating device to coat spherical or near-spherical inorganic powder with the lubricating property in the graft-modified polymer wax. Through optimal selection and improvement of raw materials, optimization of a process and reasonable compounding of all components, the formed composite lubricating agent has good lubricating property inside and outside a full temperature range during plastic processing, and integrates the effects such as heat stability, compatibilization and the like; and the preparation method is favorable for simplifying the formula and process of the modified plastics, and can improve the processing performance of the plastics and lower the cost.

Description

technical field

[0001] The invention relates to the technical field of plastic additives, in particular to a plastic composite lubricant and a manufacturing method thereof. Background technique

[0002] With the development of human society, plastics have become an indispensable material in human life and production; and the processing of plastics is an important part of making plastics usable by humans.

[0003] Plastic processing needs to melt the plastic, and then form the product; in this process, there must be friction between the plastic melt and the processing machinery, and the plastic melt itself. In order to reduce this friction and facilitate plastic processing, lubricants have become an essential plastic processing aid. Commonly used plastic lubricants include various waxes, fatty acids, metal soaps, aliphatic amides, etc., among which various waxes are the most widely used. Most wax lubricants come from petroleum, such as paraffin wax, liquid paraffin wax, mic...

Examples

Embodiment 1

[0027] The composition of lubricating powder in this implementation is as follows:

[0028] Core: spherical barium sulfate, mass ratio 40%;

[0029] Shell: grafted modified polymer wax, 60% by mass.

[0030] The formula of the graft modification of the shell is shown in Table 1:

[0031] Table 1

[0032]

[0033] The shell graft extrusion temperature is 90-120°C, of ​​which the feed section is 90°C, and the head temperature is 100°C.

[0034] The coating process conditions are a rotating speed of 2000r / min and a temperature of 110°C.

[0035] The final powder is added into polyethylene plastic by 1% to blend and granulate.

Embodiment 1

[0036] The various performance data of embodiment one contrast pure polyethylene pellets are as table 2:

[0037] Table 2

[0038]

[0039] As can be seen from Table 2, after adding the plastic composite lubricant of the present invention, the fluidity of polyethylene increases, and the processability is improved; meanwhile, the mechanical properties are not significantly affected.

Embodiment 2

[0041] The composition of lubricating powder in this implementation is as follows:

[0042] Core: glass microspheres, mass ratio 60%;

[0043] Shell: grafted modified polymer wax, 40% by mass.

[0044] The formula of the graft modification of the shell is shown in Table 2:

[0045] table 3

[0046]

[0047] The shell graft extrusion temperature is 90-130°C, of ​​which the feed section is 90°C, and the head temperature is 110°C.

[0048] The coating process conditions are a rotating speed of 2300r / min and a temperature of 115°C.

[0049] Add 5% of the final powder to polypropylene plastic and add 40% calcium carbonate to blend and granulate.

technical field

[0001] The invention relates to the technical field of plastic additives, in particular to a plastic composite lubricant and a manufacturing method thereof. Background technique

[0002] With the development of human society, plastics have become an indispensable material in human life and production; and the processing of plastics is an important part of making plastics usable by humans.

[0003] Plastic processing needs to melt the plastic, and then form the product; in this process, there must be friction between the plastic melt and the processing machinery, and the plastic melt itself. In order to reduce this friction and facilitate plastic processing, lubricants have become an essential plastic processing aid. Commonly used plastic lubricants include various waxes, fatty acids, metal soaps, aliphatic amides, etc., among which various waxes are the most widely used. Most wax lubricants come from petroleum, such as paraffin wax, liquid paraffin wax, mic...

Examples

Embodiment 1

[0027] The composition of lubricating powder in this implementation is as follows:

[0028] Core: spherical barium sulfate, mass ratio 40%;

[0029] Shell: grafted modified polymer wax, 60% by mass.

[0030] The formula of the graft modification of the shell is shown in Table 1:

[0031] Table 1

[0032]

[0033] The shell graft extrusion temperature is 90-120°C, of ​​which the feed section is 90°C, and the head temperature is 100°C.

[0034] The coating process conditions are a rotating speed of 2000r / min and a temperature of 110°C.

[0035] The final powder is added into polyethylene plastic by 1% to blend and granulate.

Embodiment 1

[0036] The various performance data of embodiment one contrast pure polyethylene pellets are as table 2:

[0037] Table 2

[0038]

[0039] As can be seen from Table 2, after adding the plastic composite lubricant of the present invention, the fluidity of polyethylene increases, and the processability is improved; meanwhile, the mechanical properties are not significantly affected.

Embodiment 2

[0041] The composition of lubricating powder in this implementation is as follows:

[0042] Core: glass microspheres, mass ratio 60%;

[0043] Shell: grafted modified polymer wax, 40% by mass.

[0044] The formula of the graft modification of the shell is shown in Table 2:

[0045] table 3

[0046]

[0047] The shell graft extrusion temperature is 90-130°C, of ​​which the feed section is 90°C, and the head temperature is 110°C.

[0048] The coating process conditions are a rotating speed of 2300r / min and a temperature of 115°C.

[0049] Add 5% of the final powder to polypropylene plastic and add 40% calcium carbonate to blend and granulate.

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