CN110938249A - Polyethylene granulation method - Google Patents
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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention discloses a polyethylene granulation method, which relates to the field of polyethylene processing and production and comprises the following steps: step 1: taking polyethylene and drying; step 2: irradiating, crosslinking and melting polyethylene electron beams; and step 3: weighing the following raw materials: polyethylene blend, dodecahydroxy stearic acid, diisononyl phthalate, organic tin, oxazine resin, a shedding agent, a coupling agent, reinforcing fiber and an accelerator; and 4, step 4: mixing to obtain premix; and 5: and (3) putting the premix into a double-screw extruder for extrusion and granulation. The polyethylene granulation method is simple, the cost is low, the preparation of the granules is convenient, the prepared polyethylene granules are insulated and ageing-resistant, the sensitivity of the polyethylene material to fracture and foam collapse is low, the polyethylene material has higher compression strength and better elasticity under the same density and body type, and the polyethylene granulation method can be widely applied to various industrial fields and also provides possibility for saving materials.
Description
Technical Field
The invention relates to the field of polyethylene processing and production, in particular to a polyethylene granulation method.
Background
Polyethylene (PE) is a crystalline thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of α -olefin in the industry, wherein the polyethylene has no odor and no toxicity, is similar to wax in hand feeling, has a melting point of 100-.
The chemical structure, molecular weight, degree of polymerization, and other properties of polyethylene are largely dependent on the polymerization process used. The polymerization method determines the type of branching and the degree of branching. Crystallinity depends on the degree of regularity of the molecular chain of the molecule and the thermal history it experiences. The polyethylene is classified into high density polyethylene, low density polyethylene and linear low density polyethylene according to the polymerization method, molecular weight and chain structure. The low density polyethylene has a low density and is the softest, and is mainly used for plastic bags, agricultural films and the like. The high-density polyethylene is mainly applied to the fields of blow molding, injection molding and the like. Linear low density polyethylene has properties similar to low density polyethylene, combined with several of the properties of high density polyethylene, combined with low energy consumption in production, and has therefore developed very rapidly and is one of the most striking new synthetic resins.
The development of the plastic industry makes people have higher and higher requirements on various properties of plastic products, higher requirements on the sanitary safety of the plastic products are provided, and the existing polyethylene material has poor stability, low compression strength and poor elasticity in a limit state, so that the development and the application of the polyethylene material are limited.
Disclosure of Invention
In order to solve the problems, the invention provides a polyethylene granulation method.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a process for pelletizing polyethylene, generally comprising the steps of:
(1) crushing a polyethylene raw material under the protection of nitrogen; the polyethylene is a mixture of high-density polyethylene, linear polyethylene and low-density polyethylene according to the mass ratio of (3-5) to 1: 1;
(2) carrying out electron beam irradiation crosslinking on the high-density polyethylene to prepare crosslinked high-density polyethylene;
then melting and mixing the cross-linked high-density polyethylene, the linear polyethylene and the low-density polyethylene at the melting temperature of 140-150 ℃, and extruding and granulating by a double-screw extruder to obtain a polyethylene blend; the extrusion temperature of the double-screw extruder is 130-;
(3) weighing the following raw materials in parts by weight:
40-60 parts of polyethylene blend;
2-4 parts of dodecahydroxystearic acid;
1-2 parts of diisononyl phthalate;
3-5 parts of organic tin;
5-9 parts of oxazine resin;
1-1.5 parts of an opening agent;
0.5-1 part of coupling agent;
4-6 parts of reinforcing fiber;
0.3-0.5 part of an accelerator;
(4) adding the polyethylene blend obtained in the step (3), dodecahydroxystearic acid, diisononyl phthalate, organotin and oxazine resin into a high-speed mixer, and mixing for 70-80 min; adding the rest of the opening agent, the coupling agent, the reinforcing fiber and the accelerator into a high-speed mixer, and mixing for 4-6h to obtain a premix;
(5) and (3) putting the premix into a double-screw extruder for extrusion and granulation.
Further, the temperature for the above-mentioned crushing is set at-25 ℃ or lower.
Preferably, the polyethylene is powder or granular material with a melt index of 0.3-30 g/10 min.
Furthermore, the irradiation energy of the electron beam irradiation crosslinking is 1-2MeV, and the power is 30-50 KW.
Preferably, the opening agent is one or more of diatomite, attapulgite powder, kaolin and calcium carbonate powder, and the fineness is 0.3-1 μm.
Preferably, the coupling agent is at least one of a rare earth coupling agent or an aluminum-zirconium bimetallic coupling agent.
Preferably, the reinforcing fiber is a modified brucite fiber, and the preparation method of the fiber comprises the following steps: the preparation method comprises the steps of chopping brucite fibers by a fiber chopping machine until the length of the brucite fibers is smaller than 80-300 mu m, stirring and soaking the brucite fibers in a sodium hydroxide solution with the mass concentration of 12.5% for 70-80min, taking out the brucite fibers, washing the brucite fibers for 3-5min, drying the brucite fibers, and mixing silane coupling agents (A-151 silane coupling agents produced by Union carbon, USA) with the mass of the brucite fibers with the fibers to obtain the reinforced fibers.
Preferably, the accelerator is any one of accelerator TMTD and accelerator DPTT.
Further, temperature zones of all sections of the double-screw extruder are sequentially set as follows: the temperature of the first temperature zone is 110-120 ℃, the temperature of the second temperature zone is 135-150 ℃, the temperature of the third temperature zone is 160-170 ℃, the temperature of the fourth temperature zone is 170-190 ℃, the temperature of the fifth temperature zone is 170-190 ℃, the temperature of the sixth temperature zone is 160-180 ℃, the temperature of the seventh temperature zone is 155-165 ℃, the temperature of the eighth temperature zone is 150-160 ℃, the temperature of the machine head is 140-150 ℃, the rotating speed of the feeding screw is 200-300r/min, and the rotating speed of.
The invention has the following beneficial effects:
the polyethylene granulation method is simple, the cost is low, the preparation of the granules is convenient, the prepared polyethylene granules are insulated and ageing-resistant, the sensitivity of the polyethylene material to fracture and foam collapse is low, the polyethylene material has higher compression strength and better elasticity under the same density and body type, and the polyethylene granulation method can be widely applied to various industrial fields and also provides possibility for saving materials.
Detailed Description
The following examples are provided to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of the present invention.
Example 1
A polyethylene granulation method comprises the following steps:
(1) taking a proper amount of polyethylene raw material, and crushing the polyethylene at-25 ℃ under the protection of nitrogen; the polyethylene is a mixture of high-density polyethylene, linear polyethylene and low-density polyethylene according to the mass ratio of 3:1:1, and the polyethylene is powder or granules with the melt index of 0.3g/10 min;
(2) carrying out electron beam irradiation crosslinking on the high-density polyethylene to prepare crosslinked high-density polyethylene; the electron beam irradiation crosslinking is to perform electron beam irradiation on a low-energy electron beam material generated by an industrial nano-type electron accelerator with the energy of 1MeV and the power of 30 KW;
then melting and mixing the cross-linked high-density polyethylene, the linear polyethylene and the low-density polyethylene at the melting temperature of 140 ℃, and extruding and granulating by using a double-screw extruder to obtain a polyethylene blend; the extrusion temperature of the double-screw extruder is 130 ℃, and the screw rotating speed is 200 r/min;
(3) weighing the following raw materials in parts by weight:
40 parts of polyethylene blend;
2 parts of dodecahydroxy stearic acid;
1 part of diisononyl phthalate;
3 parts of organic tin;
5 parts of oxazine resin;
1 part of an opening agent;
0.5 part of a coupling agent;
4 parts of reinforcing fiber;
0.3 part of an accelerator;
the opening agent is diatomite with the fineness of 0.3-1 mu m;
the coupling agent is a rare earth coupling agent;
the reinforced fiber is modified brucite fiber, and the preparation method of the fiber comprises the following steps: chopping brucite fiber with a fiber chopping machine to 80-300 μm in length, stirring and soaking with 12.5% sodium hydroxide solution for 70min, washing with clear water for 3min, oven drying, and mixing with 4% silane coupling agent (A-151 type silane coupling agent produced by Unico carbon of America) and fiber to obtain reinforced fiber;
the promoter is TMTD.
(4): adding the polyethylene blend obtained in the step 3, dodecahydroxystearic acid, diisononyl phthalate, organotin and oxazine resin into a high-speed mixer and mixing for 70 min; adding the rest of the opening agent, the coupling agent, the reinforcing fiber and the accelerator into a high-speed mixer, and mixing for 4 hours to obtain a premix;
(5): adding the premix into a double-screw extruder to extrude and granulate;
the temperature zones of the sections of the double-screw extruder are sequentially set as follows: the temperature of the first temperature zone is 110 ℃, the temperature of the second temperature zone is 135 ℃, the temperature of the third temperature zone is 160 ℃, the temperature of the fourth temperature zone is 170 ℃, the temperature of the fifth temperature zone is 170 ℃, the temperature of the sixth temperature zone is 160 ℃, the temperature of the seventh temperature zone is 155 ℃, the temperature of the eighth temperature zone is 150 ℃, the temperature of the machine head is 140 ℃, the rotating speed of the feeding screw is 200r/min, and the rotating.
Example 2
A polyethylene granulation method comprises the following steps:
(1) taking a proper amount of polyethylene raw material, and crushing the polyethylene at-30 ℃ under the protection of nitrogen; the polyethylene is a mixture of high-density polyethylene, linear polyethylene and low-density polyethylene according to a mass ratio of 4:1:1, and the polyethylene is powder or granules with a melt index of 15g/10 min;
(2) carrying out electron beam irradiation crosslinking on the high-density polyethylene to prepare crosslinked high-density polyethylene; the electron beam irradiation crosslinking is to perform electron beam irradiation on a low-energy electron beam material generated by an industrial nano-type electron accelerator with energy of 1.5MeV and power of 40 KW;
then melting and mixing the cross-linked high-density polyethylene, the linear polyethylene and the low-density polyethylene at the melting temperature of 145 ℃, and extruding and granulating by using a double-screw extruder to obtain a polyethylene blend; the extrusion temperature of the double-screw extruder is 135 ℃, and the screw rotating speed is 250 r/min;
(3) weighing the following raw materials in parts by weight:
50 parts of polyethylene blend;
3 parts of dodecahydroxy stearic acid;
1.5 parts of diisononyl phthalate;
4 parts of organic tin;
7 parts of oxazine resin;
1.2 parts of an opening agent;
0.8 part of a coupling agent;
5 parts of reinforcing fiber;
0.4 part of an accelerator;
the opening agent is attapulgite powder and kaolin with the fineness of 0.3-1 mu m according to the mass ratio of 1: 1;
the coupling agent is an aluminum-zirconium bimetallic coupling agent;
the reinforced fiber is modified brucite fiber, and the preparation method of the fiber comprises the following steps: chopping brucite fiber with a fiber chopping machine to 80-300 μm in length, stirring and soaking with 12.5% sodium hydroxide solution for 75min, washing with clear water for 4min, oven drying, and mixing with 5% silane coupling agent (A-151 type silane coupling agent produced by Unico carbon of America) and fiber to obtain reinforced fiber;
the promoter is DPTT promoter.
(4): adding the polyethylene blend obtained in the step 3, dodecahydroxystearic acid, diisononyl phthalate, organotin and oxazine resin into a high-speed mixer and mixing for 75 min; adding the rest of the opening agent, the coupling agent, the reinforcing fiber and the accelerator into a high-speed mixer, and mixing for 5 hours to obtain a premix;
(5): adding the premix into a double-screw extruder to extrude and granulate;
the temperature zones of the sections of the double-screw extruder are sequentially set as follows: the temperature of the first temperature zone is 115 ℃, the temperature of the second temperature zone is 145 ℃, the temperature of the third temperature zone is 165 ℃, the temperature of the fourth temperature zone is 180 ℃, the temperature of the fifth temperature zone is 180 ℃, the temperature of the sixth temperature zone is 170 ℃, the temperature of the seventh temperature zone is 160 ℃, the temperature of the eighth temperature zone is 155 ℃, the head temperature is 145 ℃, the rotating speed of the feeding screw is 250r/min, and the rotating speed of the.
Example 3
A polyethylene granulation method comprises the following steps:
(1) taking a proper amount of polyethylene raw material, and crushing the polyethylene under the protection of nitrogen, wherein the crushing temperature is less than or equal to-35 ℃; the polyethylene is a mixture of high-density polyethylene, linear polyethylene and low-density polyethylene according to a mass ratio of 5:1:1, and the polyethylene is powder or granules with a melt index of 30g/10 min;
(2) carrying out electron beam irradiation crosslinking on the high-density polyethylene to prepare crosslinked high-density polyethylene; the electron beam irradiation crosslinking is to perform electron beam irradiation on a low-energy electron beam material generated by an industrial nano-type electron accelerator with the energy of 2MeV and the power of 50 KW;
then melting and mixing the cross-linked high-density polyethylene, the linear polyethylene and the low-density polyethylene at the melting temperature of 150 ℃, and extruding and granulating by using a double-screw extruder to obtain a polyethylene blend; the extrusion temperature of the double-screw extruder is 140 ℃, and the screw rotating speed is 300 r/min;
(3) weighing the following raw materials in parts by weight:
60 parts of polyethylene blend;
4 parts of dodecahydroxy stearic acid;
2 parts of diisononyl phthalate;
5 parts of organic tin;
9 parts of oxazine resin;
1.5 parts of an opening agent;
1 part of a coupling agent;
6 parts of reinforcing fiber;
0.5 part of an accelerator;
the opening agent is calcium carbonate powder with the fineness of 0.3-1 mu m;
the coupling agent is a mixture of a rare earth coupling agent and an aluminum-zirconium bimetallic coupling agent according to a mass ratio of 1: 1;
the reinforced fiber is modified brucite fiber, and the preparation method of the fiber comprises the following steps: chopping brucite fiber with a fiber chopping machine until the length is less than 80-300 μm, stirring and soaking with a sodium hydroxide solution with the mass concentration of 12.5% for 80min, taking out, washing with clear water for 5min, drying, and mixing a silane coupling agent (A-151, produced by Unico carbon corporation in America) with the mass of 6% of the brucite fiber with the fiber to obtain the reinforced fiber;
the promoter is DPTT promoter.
(4): adding the polyethylene blend obtained in the step 3, dodecahydroxystearic acid, diisononyl phthalate, organotin and oxazine resin into a high-speed mixer and mixing for 80 min; adding the rest of the opening agent, the coupling agent, the reinforcing fiber and the accelerator into a high-speed mixer, and mixing for 6 hours to obtain a premix;
(5): adding the premix into a double-screw extruder to extrude and granulate;
the temperature zones of the sections of the double-screw extruder are sequentially set as follows: the temperature of the first temperature zone is 120 ℃, the temperature of the second temperature zone is 150 ℃, the temperature of the third temperature zone is 170 ℃, the temperature of the fourth temperature zone is 190 ℃, the temperature of the sixth temperature zone is 180 ℃, the temperature of the seventh temperature zone is 165 ℃, the temperature of the eighth temperature zone is 160 ℃, the temperature of the machine head is 150 ℃, the rotating speed of the feeding screw is 300r/min, and the rotating speed of the main machine screw is 500 r/.
Performance detection
The following properties were measured on the polyethylene pellets obtained in examples 1 to 3 and compared with those of conventional polyethylene pellets.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A polyethylene granulation method is characterized by comprising the following steps:
crushing a polyethylene raw material under the protection of nitrogen; the polyethylene is a mixture of high-density polyethylene, linear polyethylene and low-density polyethylene according to the mass ratio of (3-5) to 1: 1;
carrying out electron beam irradiation crosslinking on the high-density polyethylene to prepare crosslinked high-density polyethylene;
melting and mixing the cross-linked high-density polyethylene, the linear polyethylene and the low-density polyethylene at the melting temperature of 140-150 ℃, and extruding and granulating by a double-screw extruder to obtain a polyethylene blend; the extrusion temperature of the double-screw extruder is 130-;
(3) weighing the following raw materials in parts by weight:
40-60 parts of polyethylene blend;
2-4 parts of dodecahydroxystearic acid;
1-2 parts of diisononyl phthalate;
3-5 parts of organic tin;
5-9 parts of oxazine resin;
1-1.5 parts of an opening agent;
0.5-1 part of coupling agent;
4-6 parts of reinforcing fiber;
0.3-0.5 part of an accelerator;
(4) adding the polyethylene blend obtained in the step (3), dodecahydroxystearic acid, diisononyl phthalate, organotin and oxazine resin into a high-speed mixer, and mixing for 70-80 min; adding the rest of the opening agent, the coupling agent, the reinforcing fiber and the accelerator into a high-speed mixer, and mixing for 4-6h to obtain a premix;
(5) and (3) putting the premix into a double-screw extruder for extrusion and granulation.
2. A polyethylene granulation process as claimed in claim 1, wherein in step (1), the temperature of said crushing is set at-25 ℃ or lower.
3. The method of claim 1, wherein the polyethylene is in the form of powder or pellets having a melt index of 0.3-30 g/10 min.
4. The polyethylene granulation method according to claim 1, wherein the irradiation energy of the electron beam irradiation crosslinking is 1-2MeV, and the power is 30-50 KW.
5. The polyethylene granulation method as claimed in claim 1, wherein the opening agent is one or more of diatomaceous earth, attapulgite powder, kaolin, and calcium carbonate powder, and the fineness is 0.3-1 μm.
6. The method of claim 1, wherein the coupling agent is at least one of a rare earth coupling agent or an aluminum-zirconium bimetallic coupling agent.
7. A process for pelletizing polyethylene according to claim 1, characterized in that the reinforcing fibers are modified brucite fibers obtained by a process comprising: the preparation method comprises the steps of chopping brucite fibers by a fiber chopping machine until the length of the brucite fibers is smaller than 80-300 mu m, stirring and soaking the brucite fibers in a sodium hydroxide solution with the mass concentration of 12.5% for 70-80min, taking out the brucite fibers, washing the brucite fibers for 3-5min, drying the brucite fibers, and mixing silane coupling agents (A-151 silane coupling agents produced by Union carbon, USA) with the mass of the brucite fibers with the fibers to obtain the reinforced fibers.
8. A process for pelletizing polyethylene according to claim 1, characterized in that the accelerator is either accelerator TMTD or accelerator DPTT.
9. The polyethylene granulation method as claimed in claim 1, wherein the temperature zones of the twin-screw extruder are sequentially arranged as follows: the temperature of the first temperature zone is 110-120 ℃, the temperature of the second temperature zone is 135-150 ℃, the temperature of the third temperature zone is 160-170 ℃, the temperature of the fourth temperature zone is 170-190 ℃, the temperature of the fifth temperature zone is 170-190 ℃, the temperature of the sixth temperature zone is 160-180 ℃, the temperature of the seventh temperature zone is 155-165 ℃, the temperature of the eighth temperature zone is 150-160 ℃, the temperature of the machine head is 140-150 ℃, the rotating speed of the feeding screw is 200-300r/min, and the rotating speed of.
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