CN112126155B - Preparation method of light EPP (expanded polypropylene) molded foamed double-density sheet - Google Patents
Preparation method of light EPP (expanded polypropylene) molded foamed double-density sheet Download PDFInfo
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Abstract
The invention discloses a preparation method of a light EPP forming foaming double-density plate, which specifically comprises the following steps: mixing PP, ethylene-octene copolymer, nano calcium carbonate, talcum powder, white carbon black, strength additive, antioxidant and nano kaolin, granulating, cooling with water, air-drying and granulating to obtain a raw material of the component I; acrylic acid, ammonium persulfate, ethanol and cellulose nanofibrils are subjected to modification treatment, centrifugation and washing to obtain a component II raw material; uniformly mixing the component I raw material, the component II raw material and the foaming agent, and putting the mixture into an injection molding machine to obtain a foamed double-density plate; the invention has reasonable process design, can realize the generation of a dual-density structure when the structure of the composite material is formed by utilizing the raw materials of the component I and the component II, has firm bonding among the components of the raw materials, and can effectively improve the performance of better tensile strength and bending strength of the formed dual-density plate.
Description
Technical Field
The invention relates to the technical field of EPP plate preparation processes, in particular to a preparation method of a light EPP forming foaming double-density plate.
Background
Polypropylene has many characteristics such as heat resistance, chemical stability and environmental protection, and is widely used in various fields. However, the rain-permeable polypropylene has low melt strength and has the defect of poor foaming process performance, so that the use is greatly limited.
The foamed polypropylene is used as foamed plastic with advanced comprehensive performance, has the advantages of excellent toughness and high heat-resisting temperature, and can be applied to automobile heat-insulating materials and buffering energy-absorbing parts.
In the prior art, most of the preparation methods of the foaming polypropylene adopt an extrusion foaming method for foaming treatment. However, because the process has more severe requirements for both equipment and process, it requires specially made pipes and containers, and requires high-protection safety fire-fighting equipment. Thus resulting in higher investment and operating costs. And the tensile strength, the bending strength and the impact strength of the foamed polypropylene prepared by the process have certain limitations.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a light EPP forming foaming double-density plate with lower cost; the light EPP forming foaming double-density plate prepared by the method has better tensile strength, bending strength and impact strength.
The technical scheme of the invention is as follows: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
According to the weight parts, 135-150 parts of PP, 53-58 parts of ethylene-octene copolymer, 36-40 parts of nano calcium carbonate, 13-15 parts of talcum powder, 8-15 parts of white carbon black, 10-12 parts of strength additive, 7-10 parts of antioxidant and 3-5 parts of nano kaolin are continuously mixed for 1-3 hours under the conditions that the temperature is 45-65 ℃ and the stirring speed is 180-200 r/min, then the mixture is added into a granulator to be granulated at 220-260 ℃, and the raw material of the component I is obtained through water cooling, air drying and granule cutting;
step two: preparation of raw materials of component II
Adding 15-25 wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to a volume ratio of 50: 4-7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 15-20: 1, preserving the heat of 90% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135-215 g/L, and carrying out modification treatment at the temperature of 75-85 ℃; then centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 27-35 parts by weight of the component I raw material, 11-13 parts by weight of the component II raw material and 3-5 parts by weight of a foaming agent, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180-220 ℃, and then preserving the heat for 35-45 min to obtain a solution carrying foaming gas; and then, injecting the solution into a plate mold cavity, and cooling to obtain the foamed dual-density plate.
Further, in the step one, the strength additive is maleic anhydride grafted polyethylene.
Further, the antioxidant in the first step is a mixture of an antioxidant 1076, an antioxidant 1010 and an antioxidant 264 in a mass ratio of 3-7: 1-3: 1; can effectively realize the inhibition effect on the thermal degradation and the oxidative degradation of the polymer by using the antioxidant.
Further, the second step is: adding 15-25 wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to a volume ratio of 50: 4-7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 15-20: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135-215 g/L, and continuously performing magnetic stirring reaction for 1-1.5 hours under the conditions that the temperature is 85-95 ℃ and the stirring speed is 180-200 r/min; centrifuging and washing to obtain a component II raw material; the cellulose nanofibrils are subjected to magnetic modification treatment, and the modified cellulose nanofibrils can effectively improve the foam structure of PP, so that the foam structure has a better promotion effect in the later foaming treatment.
Further, the second step is: adding 15-25 wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to a volume ratio of 50: 4-7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 15-20: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135-215 g/L, and ultrasonically dispersing for 30-45 min at the temperature of 75-85 ℃, the power of 50-200W and the frequency of 30-90 Hz; centrifuging and washing to obtain a component II raw material; the cellulose nanofibrils are subjected to ultrasonic modification treatment, and the modified cellulose nanofibrils can effectively improve the foam structure of PP (polypropylene), so that the modified cellulose nanofibrils have a better promotion effect in the later foaming treatment; and the modification efficiency of the ultrasonic modification treatment is higher.
Further, the third step is specifically as follows: uniformly mixing 27-35 parts by weight of the component I raw material, 11-13 parts by weight of the component II raw material and 3-5 parts by weight of a foaming agent, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180-220 ℃, and then preserving the heat for 35-45 min to obtain a solution carrying foaming gas; and then setting the mold temperature of the plate mold to be 50-65 ℃, injecting the solution into the plate mold cavity at an injection speed of 5.6-6.4L/min, and cooling to obtain the foamed dual-density plate.
Further, the foaming agent in the third step is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1; the mixture of the 10-84-4 foaming agent and the 123-77-3 foaming agent can enable foam holes during PP foaming to be more compact, and further can effectively improve the mechanical property of the foamed double-density sheet.
Compared with the prior art, the invention has the beneficial effects that: the process is reasonable in design, and the foaming agent is used for generating gas cores during injection molding, so that the foaming process of the polypropylene is realized; meanwhile, the double-density structure can be generated when the structure of the composite material is formed by utilizing the raw materials of the component I and the component II, the raw material components are firmly bonded, and the formed double-density plate can be effectively improved to have better tensile strength and bending strength.
Detailed Description
Example 1: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
Continuously mixing 135 parts of PP, 53 parts of ethylene-octene copolymer, 36 parts of nano calcium carbonate, 13 parts of talcum powder, 8 parts of white carbon black, 10 parts of strength additive, 7 parts of antioxidant and 3 parts of nano kaolin for 1 hour under the conditions that the temperature is 45 ℃ and the stirring speed is 180r/min, then adding the mixture into a granulator for granulation under the condition of 220 ℃, and obtaining a component I raw material through water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 3:1: 1;
step two: preparation of raw materials of component II
Adding 15 wt% acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 50:4, and fully stirring for 30 min; then adding the mixture to acrylic acid in a volume ratio of 15: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; then adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135g/L, and continuously performing magnetic stirring reaction for 1h under the conditions that the temperature is 85 ℃ and the stirring speed is 180 r/min; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 27 parts by weight of the component I raw material, 11 parts by weight of the component II raw material and 3 parts by weight of a foaming agent, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180 ℃, and then preserving the temperature for 35min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to be 50 ℃, injecting the solution into a plate mold cavity at an injection speed of 5.6L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Example 2: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
According to the weight parts, 140 parts of PP, 55 parts of ethylene-octene copolymer, 38 parts of nano calcium carbonate, 14 parts of talcum powder, 12 parts of white carbon black, 11 parts of strength auxiliary agent, 9 parts of antioxidant and 4 parts of nano kaolin are continuously mixed for 2 hours under the conditions that the temperature is 55 ℃ and the stirring speed is 190r/min, then the mixture is added into a granulator to be granulated under the condition of 250 ℃, and the raw material of the component I is obtained after water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 5:2: 1;
step two: preparation of raw materials of component II
Adding 20 wt% acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 50:5, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 18: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; then adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 175g/L, and continuously performing magnetic stirring reaction for 1.2h under the conditions that the temperature is 90 ℃ and the stirring speed is 190 r/min; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 30 parts of the component I raw material, 12 parts of the component II raw material and 4 parts of foaming agent in parts by weight, putting the mixture into an injection molding machine, setting the injection molding temperature to be 200 ℃, and then preserving the temperature for 40min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to 55 ℃, injecting the solution into the plate mold cavity at an injection speed of 6.2L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Example 3: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
Continuously mixing 150 parts by weight of PP, 58 parts by weight of ethylene-octene copolymer, 40 parts by weight of nano calcium carbonate, 15 parts by weight of talcum powder, 15 parts by weight of white carbon black, 12 parts by weight of strength auxiliary agent, 10 parts by weight of antioxidant and 5 parts by weight of nano kaolin for 3 hours under the conditions that the temperature is 65 ℃ and the stirring speed is 200r/min, then adding the mixture into a granulator for granulation under the condition of 260 ℃, and obtaining a component I raw material through water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 7:3: 1;
step two: preparation of raw materials of component II
Adding 25wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 50:7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 20: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; then adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 215g/L, and continuously performing magnetic stirring reaction for 1.5 hours under the conditions that the temperature is 95 ℃ and the stirring speed is 200 r/min; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 35 parts of the component I raw material, 13 parts of the component II raw material and 5 parts of a foaming agent in parts by weight, putting the mixture into an injection molding machine, setting the injection molding temperature to be 220 ℃, and then preserving the temperature for 45min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to 65 ℃, injecting the solution into a plate mold cavity at an injection speed of 6.4L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Example 4: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
Continuously mixing 135 parts of PP, 53 parts of ethylene-octene copolymer, 36 parts of nano calcium carbonate, 13 parts of talcum powder, 8 parts of white carbon black, 10 parts of strength additive, 7 parts of antioxidant and 3 parts of nano kaolin for 1 hour under the conditions that the temperature is 45 ℃ and the stirring speed is 180r/min, then adding the mixture into a granulator for granulation under the condition of 220 ℃, and obtaining a component I raw material through water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 3:1: 1;
step two: preparation of raw materials of component II
Adding 15 wt% acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 50:4, and fully stirring for 30 min; then adding the mixture to acrylic acid in a volume ratio of 15: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135g/L, and ultrasonically dispersing for 30min at the temperature of 75 ℃, the power of 50W and the frequency of 30 Hz; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 27 parts of the component I raw material, 11 parts of the component II raw material and 3 parts of a foaming agent in parts by weight, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180 ℃, and then preserving the temperature for 35min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to be 50 ℃, injecting the solution into a plate mold cavity at an injection speed of 5.6L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Example 5: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
According to the weight parts, 140 parts of PP, 55 parts of ethylene-octene copolymer, 38 parts of nano calcium carbonate, 14 parts of talcum powder, 12 parts of white carbon black, 11 parts of strength auxiliary agent, 9 parts of antioxidant and 4 parts of nano kaolin are continuously mixed for 2 hours under the conditions that the temperature is 55 ℃ and the stirring speed is 190r/min, then the mixture is added into a granulator to be granulated under the condition of 240 ℃, and the raw material of the component I is obtained after water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 5:1.5: 1;
step two: preparation of raw materials of component II
Adding 20 wt% acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 10:1, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 18: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 195g/L, and ultrasonically dispersing for 40min at the temperature of 80 ℃, the power of 150W and the frequency of 80 Hz; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 30 parts of the component I raw material, 12 parts of the component II raw material and 4 parts of foaming agent in parts by weight, putting the mixture into an injection molding machine, setting the injection molding temperature to 195 ℃, and then preserving the temperature for 40min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to be 60 ℃, injecting the solution into the plate mold cavity at the injection speed of 6.2L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Example 6: a preparation method of a light EPP forming foaming double-density plate specifically comprises the following steps:
the method comprises the following steps: preparation of component I raw materials
Continuously mixing 150 parts by weight of PP, 58 parts by weight of ethylene-octene copolymer, 40 parts by weight of nano calcium carbonate, 15 parts by weight of talcum powder, 15 parts by weight of white carbon black, 12 parts by weight of strength auxiliary agent, 10 parts by weight of antioxidant and 5 parts by weight of nano kaolin for 3 hours under the conditions that the temperature is 65 ℃ and the stirring speed is 200r/min, then adding the mixture into a granulator for granulation under the condition of 260 ℃, and obtaining a component I raw material through water cooling, air drying and grain cutting; wherein the strength additive is maleic anhydride grafted polyethylene; the antioxidant is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 7:3: 1;
step two: preparation of raw materials of component II
Adding 25wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to the volume ratio of 50:7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 20: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; then adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 215g/L, and ultrasonically dispersing for 45min at the temperature of 85 ℃, the power of 200W and the frequency of 90 Hz; centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 35 parts of the component I raw material, 13 parts of the component II raw material and 5 parts of a foaming agent in parts by weight, putting the mixture into an injection molding machine, setting the injection molding temperature to be 220 ℃, and then preserving the temperature for 45min to obtain a solution carrying foaming gas; then setting the mold temperature of the plate mold to 65 ℃, injecting the solution into a plate mold cavity at an injection speed of 6.4L/min, and cooling to obtain the foamed dual-density plate; wherein the foaming agent is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent according to the mass ratio of 2: 1.
Experimental example: the mechanical property retention rate of the foamed dual-density sheet prepared in the embodiments 1 to 6 of the present invention is tested, and the specific test structure is as follows:
and (4) conclusion: the foamed double-density plate prepared by the method has better mechanical property.
Claims (5)
1. The preparation method of the light EPP forming foaming double-density plate is characterized by comprising the following steps of:
the method comprises the following steps: preparation of component I raw materials
According to the weight parts, 135-150 parts of PP, 53-58 parts of ethylene-octene copolymer, 36-40 parts of nano calcium carbonate, 13-15 parts of talcum powder, 8-15 parts of white carbon black, 10-12 parts of strength additive, 7-10 parts of antioxidant and 3-5 parts of nano kaolin are continuously mixed for 1-3 hours under the conditions that the temperature is 45-65 ℃ and the stirring speed is 180-200 r/min, then the mixture is added into a granulator to be granulated at 220-260 ℃, and the raw material of the component I is obtained through water cooling, air drying and granule cutting; the strength auxiliary agent is maleic anhydride grafted polyethylene;
step two: preparation of raw materials of component II
Adding 15-25 wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to a volume ratio of 50: 4-7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 15-20: 1, preserving the heat of 90% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135-215 g/L, and carrying out modification treatment at the temperature of 75-85 ℃; then centrifuging and washing to obtain a component II raw material;
step three: preparation of foamed double-density sheet
Uniformly mixing 27-35 parts by weight of the component I raw material, 11-13 parts by weight of the component II raw material and 3-5 parts by weight of a foaming agent, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180-220 ℃, and then preserving the heat for 35-45 min to obtain a melt carrying foaming gas; and then, injecting the melt into a plate mold cavity, and cooling to obtain the foamed double-density plate.
2. The preparation method of the light EPP forming foamed dual density sheet according to claim 1, wherein the antioxidant in the first step is a mixture of antioxidant 1076, antioxidant 1010 and antioxidant 264 in a mass ratio of 3-7: 1-3: 1.
3. The method for preparing a lightweight EPP molded foamed dual density sheet according to claim 1, wherein the second step is: adding 15-25 wt% of acrylic acid and ammonium persulfate into a reaction kettle with a stirrer according to a volume ratio of 50: 4-7, and fully stirring for 30 min; then adding the acrylic acid into the mixture in a volume ratio of 15-20: 1, keeping the temperature of 90wt% ethanol at 65 ℃ for 1h to obtain intermediate mixed liquor; adding cellulose nanofibrils into the intermediate mixed solution according to the ratio of 135-215 g/L, and ultrasonically dispersing for 30-45 min at the temperature of 75-85 ℃, the power of 50-200W and the frequency of 30-90 Hz; and centrifuging and washing to obtain the component II raw material.
4. The preparation method of the light EPP molding foaming dual-density plate as claimed in claim 1, wherein the three steps are as follows: uniformly mixing 27-35 parts by weight of the component I raw material, 11-13 parts by weight of the component II raw material and 3-5 parts by weight of a foaming agent, putting the mixture into an injection molding machine, setting the injection molding temperature to be 180-220 ℃, and then preserving the heat for 35-45 min to obtain a melt carrying foaming gas; and then setting the mold temperature of the plate mold to be 50-65 ℃, injecting the melt into the plate mold cavity at an injection speed of 5.6-6.4L/min, and cooling to obtain the foamed dual-density plate.
5. A method for preparing a lightweight EPP foamed dual density sheet according to any one of claims 1 and 3, wherein the foaming agent in step three is a mixture of 10-84-4 foaming agent and 123-77-3 foaming agent in a mass ratio of 2: 1.
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