REGENERATED POLYMER ALLOY MATERIAL AND METHOD FOR PREPARING SAME

Abstract

A regenerated polymer alloy material is provided. The regenerated polymer alloy material is mainly prepared from the following raw materials in parts by mass: a waste HIPS: 55-70, a PP: 30-45, an alkylation reaction catalyst: 0.1-0.4, a co-catalyst: 0.1-0.3, and a HIPS-based macromolecular chain extender: 2-8. The regenerated polymer alloy material uses the waste HIPS and the PP new materials as raw materials, to obtain a waste HIPS based regenerated polymer alloy material with excellent comprehensive properties by using two types of chemical modifiers in combination in segments. The waste HIPS based regenerated polymer alloy material has environmental protection and high value. Further, a method for preparing the regenerated polymer alloy material is also provided.

Claims

1. A regenerated polymer alloy material, mainly prepared from following raw materials in parts by mass: a waste high impact polystyrene (HIPS): 55-70, a polypropylene (PP): 30-45, an alkylation reaction catalyst: 0.1-0.4, a co-catalyst: 0.1-0.3, and a HIPS-based macromolecular chain extender: 2-8.

2. The regenerated polymer alloy material according to claim 1, wherein the waste HIPS is a flake material obtained by crushing and homogenizing a waste HIPS material.

3. The regenerated polymer alloy material according to claim 1, wherein the PP is a new PP material.

4. The regenerated polymer alloy material according to claim 1, wherein the alkylation reaction catalyst is anhydrous aluminum chloride.

5. The regenerated polymer alloy material according to claim 1, wherein the co-catalyst is styrene.

6. The regenerated polymer alloy material according to claim 1, wherein the HIPS-based macromolecular chain extender is a high impact polystyrene grafted glycidyl methacrylate (HIPS-g-GMA).

7. A method for preparing the regenerated polymer alloy material according to claim 1, comprising steps of: mixing the waste HIPS, the PP, the alkylation reaction catalyst and the co-catalyst according to proportion of the raw materials to obtain a mixture material; adding the mixture material from a main feeding device of a twin-screw extruder to melt the mixture material; controlling a screw rotation speed of the twin-screw extruder to 40-80 rpm; adding the HIPS-based macromolecular chain extender from a fifth processing zone of the twin-screw extruder according to the proportion of the raw materials to blend with the melted mixture material to obtain a resulting material; and extruding, drawing, cooling and pelletizing the resulting material to obtain the waste HIPS based regenerated polymer alloy material.

8. The method for preparing the regenerated polymer alloy material according to claim 7, wherein a range of a processing temperature of the twin screw extruder is 175?235? C.

9. The method for preparing the regenerated polymer alloy material according to claim 7, wherein temperatures of eight processing zones of the twin-screw extruder are successively 180? C., 180? C., 185? C., 185? C., 235? C., 235? C., 230? C., and 230? C.

Description

DESCRIPTION OF THE EMBODIMENTS

[0030] The following raw materials are all commercially available products unless otherwise specified.

Embodiment 1

[0031] The regenerated polymer alloy material provided in this embodiment is mainly prepared from the following raw materials in parts by mass: [0032] a waste HIPS: 55, [0033] a PP: 45, [0034] an alkylation reaction catalyst: 0.4, [0035] a co-catalyst: 0.3, and [0036] a HIPS-based macromolecular chain extender: 6.

[0037] The waste HIPS is a flake material obtained by crushing and homogenizing waste HIPS (waste high impact polystyrene), and the PP is a new PP (polypropylene) material. The co-catalyst is styrene. The alkylation reaction catalyst is anhydrous aluminum chloride. The HIPS-based macromolecular chain extender is a high impact polystyrene grafted glycidyl methacrylate (HIPS-g-GMA).

[0038] The method for preparing the regenerated polymer alloy material comprises the steps of: mixing the waste HIPS, the PP, the alkylation reaction catalyst and the co-catalyst according to the above-mentioned proportion of the raw materials to obtain a mixture material, adding the mixture material from a main feeding device of a twin-screw extruder to melt, controlling a screw rotation speed to 40 rpm, adding the HIPS-based macromolecular chain extender from the fifth processing zone of the twin-screw extruder according to the above-mentioned proportion of the raw materials to blend with a melted mixture material, and then extruding, drawing, cooling and pelletizing to obtain the regenerated polymer alloy material.

[0039] The temperatures of eight processing zones of the twin-screw extruder successively are 180? C., 180? C., 185? C., 185? C., 235? C., 235? C., 230? C., and 230? C.

Embodiment 2

[0040] The regenerated polymer alloy material provided in this embodiment is mainly prepared from the following raw materials in parts by mass: [0041] a waste HIPS: 70, [0042] a PP: 30, [0043] an alkylation reaction catalyst: 0.2; [0044] a co-catalyst: 0.1; and [0045] a HIPS-based macromolecular chain extender: 8.

[0046] The above components are the same as those in Embodiment 1.

[0047] The method for preparing the regenerated polymer alloy material comprises the steps of: mixing the waste HIPS, the PP, the alkylation reaction catalyst and the co-catalyst according to the above-mentioned proportion of the raw materials to obtain a mixture material, adding the mixture material from a main feeding device of a twin-screw extruder to melt, controlling a screw rotation speed to 60 rpm, adding the HIPS-based macromolecular chain extender from the fifth processing zone of the twin-screw extruder according to the above-mentioned proportion of the raw materials to blend with a melted mixture material, and then extruding, drawing, cooling and pelletizing to obtain the regenerated polymer alloy material.

[0048] The temperatures of eight processing zones of the twin-screw extruder successively are 175? C., 180? C., 185? C., 185? C., 225? C., 225? C., 225? C., and 230? C.

Embodiment 3

[0049] The regenerated polymer alloy material provided in this embodiment is mainly prepared from the following raw materials in parts by mass: [0050] a waste HIPS: 60, [0051] a PP: 40, [0052] an alkylation reaction catalyst: 0.3, [0053] a co-catalyst: 0.2, and [0054] a HIPS-based macromolecular chain extender: 6.

[0055] The above components are the same as those in Embodiment 1.

[0056] The method for preparing the regenerated polymer alloy material comprises the steps of: mixing the waste HIPS, the PP, the alkylation reaction catalyst and the co-catalyst according to the above-mentioned proportion of the raw materials to obtain a mixture material, adding the mixture material from a main feeding device of a twin-screw extruder to melt, controlling a screw rotation speed to 80 rpm, adding the HIPS-based macromolecular chain extender from the fifth processing zone of the twin-screw extruder according to the above-mentioned proportion of the raw materials to blend with a melted mixture material, and then extruding, drawing, cooling and pelletizing to obtain the regenerated polymer alloy material.

[0057] The temperatures of eight processing zones of the twin-screw extruder successively are 175? C., 180? C., 180? C., 180? C., 225? C., 225? C., 225? C., and 235? C.

[0058] The mechanical properties of the regenerated polymer alloy materials prepared in Embodiments 1-3 are summarized in Table 1 below.

[0059] Table 1: Summary of Mechanical Properties of the Regenerated Polymer Alloy Materials Prepared in Embodiments 1-3.

TABLE-US-00001 Impact strength Tensile (KJ/m.sup.2) strength (MPa) GB/T 1043 GB/T 1040 waste HIPS/PP{circle around (1)} 3.2 23.2 Embodiment 1 9.3 35.6 Embodiment 2 8.6 32.9 Embodiment 3 8.7 31.9 Comparative example 1{circle around (2)} 7.5 30.4 Comparative example 2{circle around (3)} 5.1 26.1 Comparative example 3{circle around (4)} 6.1 28.9 Comparative example 5{circle around (5)} 7.1 30.1

[0060] In Table 1:

[0061] {circle around (1)} The preparation method and steps are the same as those in embodiment 1. The material ratio is 55 parts of waste HIPS and 45 parts of PP, and no alkylation reaction catalyst, co-catalyst and HIPS-based macromolecular chain extender is contained.

[0062] {circle around (2)} The preparation method and steps are the same as those in Embodiment 1. The material ratio is 55 parts of waste HIPS, 45 parts of PP, 6 parts of HIPS-based macromolecular chain extender, and no alkylation reaction catalyst and co-catalyst is contained.

[0063] {circle around (3)} The preparation method and steps are the same as those in Embodiment 1. The material ratio is 55 parts of waste HIPS, 45 parts of PP, 0.4 parts of alkylation reaction catalyst, 0.3 part of co-catalyst, and no HIPS-based macromolecular chain extender is contained.

[0064] {circle around (4)} The preparation method, steps and the proportion of the raw materials are the same as those in Embodiment 1, but the temperatures of eight processing zones of the twin-screw extruder successively are 180? C., 180? C., 185? C., 185? C., 185? C., 185? C., 185? C., and 185? C.

[0065] {circle around (5)} The preparation method, steps and the proportion of the raw materials are the same as those in Embodiment 1, but the temperatures of eight processing zones of the twin-screw extruder successively are 230? C., 235? C., 235? C., 235? C., 235? C., 235? C., 235? C., and 235? C.

[0066] It can be seen from the above-mentioned specific experimental data that, compared to the unmodified waste HIPS/PP, the mechanical properties of the regenerated polymer alloy material prepared by the present invention are improved overall, and the modification effect is significant.

[0067] The difference between Embodiments 1 and Comparative example 1({circle around (2)}) lies in whether the blending system is compatibilized by an alkylation reaction to generate macromolecular compatibilizers. It can be seen that after the addition of the alkylation reaction catalyst, the impact and tensile strength of the regenerated material have been improved to a certain extent, proving that the first step of alkylation reaction modification is very meaningful, which is beneficial for improving the compatibility of the blend and thus improving the comprehensive properties of the regenerated material.

[0068] The difference between Embodiments 1 and Comparative example 2({circle around (3)}) is whether to add the HIPS-based macromolecular chain extender. It can be seen that after adding macromolecular chain extenders, the overall properties are significantly improved (especially for the impact strength that is more sensitive to the main chain molecular weight, molecular chain structure, and phase interface interaction). It can also be proven that the in-situ chain extension repair effect of the second step is good, which can be attributed to its molecular chain extension and phase interface repair effect on the waste HIPS phase after in-situ chain extension modification.

[0069] The difference between Embodiments 1 and Comparative example 3({circle around (4)}) and Comparative example 4({circle around (5)}) is the processing temperature. The results prove that the processing temperatures of fourth zones of the rear section are proactively and rapidly increased compared with that of the fourth zone of the first section, which is more effective for the modification effect. The processing temperatures of the four zones in the front section are about 180? C., which not only ensures the alkylation reaction, but also avoids the premature volatilization of aluminum chloride at high temperature and the potential chain breaking competition reaction. The processing temperatures of the fourth zones of the rear section are about 230? C., which can quickly volatilize aluminum chloride and ensure the effective implementation of the chain extension reaction.

[0070] In summary, through the two-step reactive modification of the present invention, namely alkylation reaction modification and in-situ chain extension repair modification, a double-effect modification effect is achieved, thereby significantly improving the comprehensive properties of the regenerated material. It is very conducive to improving the environmental adaptability of recycled products and broadening their application scenarios. Regenerated alloy products with such comprehensive properties have good market prospects.

[0071] The above embodiments are preferred examples of the present invention. The PP, the HIPS-based macromolecular chain extender HIPS-g-GMA, the alkylation reaction catalyst AlCl.sub.3, and styrene selected in the embodiments are obtained from commercially available off-the-shelf products.

[0072] However, the implementations of the present invention are not limited to the above-mentioned embodiments, and the waste HIPS and other raw materials selected in the above-mentioned embodiments may also be commercially available ready-made products with similar properties. Changes, modifications, substitutions, combinations, and simplifications which do not depart from the spiritual substances and principles of the present invention are all equivalent alternatives and are intended to be included in the scope of protection of the present invention.