CN108859072B - Preparation process of multilayer polypropylene co-extrusion composite material draw-bar box - Google Patents

Preparation process of multilayer polypropylene co-extrusion composite material draw-bar box Download PDF

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CN108859072B
CN108859072B CN201810604340.3A CN201810604340A CN108859072B CN 108859072 B CN108859072 B CN 108859072B CN 201810604340 A CN201810604340 A CN 201810604340A CN 108859072 B CN108859072 B CN 108859072B
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何峥
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/02—Combined thermoforming and manufacture of the preform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box, which comprises the following steps: step 1: weighing 0.1-2 parts of first ethylene propylene copolymer and 8-12 parts of color master batch according to parts by weight, and mixing to obtain a first layer raw material; step 2: weighing 1-3 parts of second ethylene propylene copolymer, 0.1-0.5 part of polypropylene and 8-12 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material; step 3: weighing 5-9 parts of polypropylene and 8-12 parts of color master batch as raw materials of a third layer according to the parts by weight; step 4: sequentially placing the first layer of raw material, the second layer of raw material and the third layer of raw material in a vacuum forming mould at the temperature of 200-300 ℃, vacuumizing to form vacuum, molding, baking the plate, and cooling. The invention has lower cost and lighter weight.

Description

Preparation process of multilayer polypropylene co-extrusion composite material draw-bar box
Technical Field
The invention relates to the field of preparation of box bodies, in particular to a preparation process of a multi-layer polypropylene co-extrusion composite draw-bar box.
Background
At present, the preparation process of the draw-bar box made of polypropylene composite material is an injection molding process, and the injection molding process has the defects that: 1. the manufacturing cost of the die is too high; 2. the weight of the product is larger; 3. the price of the product is higher due to the high manufacturing cost of the die and the very large weight of the prepared product; 4. when a product prepared by the injection molding process is subjected to a drop test, the surface of the product can be whitened.
Chinese patent publication No. CN106496787A discloses a process for manufacturing a draw-bar box made of polypropylene composite material, which utilizes blow molding to manufacture the draw-bar box, so as to overcome the defect of over-high price of the product produced by traditional injection molding. However, blow-molded draw-bar boxes are not strong in their resistance to falling and thus are in need of improvement.
Disclosure of Invention
The invention aims to provide a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box, which has the advantages of simple preparation process and low finished product price.
The technical purpose of the invention is realized by the following technical scheme:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
step 1: weighing 0.1-2 parts of first ethylene propylene copolymer and 8-12 parts of color master batch according to parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 1-3 parts of second ethylene propylene copolymer, 0.1-0.5 part of polypropylene and 8-12 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 5-9 parts of polypropylene and 8-12 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: sequentially placing the first layer of raw material, the second layer of raw material and the third layer of raw material in a vacuum forming mould at the temperature of 200-300 ℃, vacuumizing to form vacuum, molding, baking the plate, and cooling.
By adopting the technical scheme, the mold cost is very low, the cost only needs 3 ten thousand RMB, the mold cost of the traditional polypropylene draw-bar box preparation process is between 60 ten thousand RMB and 70 ten thousand RMB, the traditional injection molding polypropylene draw-bar box process is very complex, the preparation process of the multilayer polypropylene co-extrusion composite draw-bar box is not complex, and the product can be prepared by using a vacuum plastic suction mold.
The invention is further configured to: the first ethylene propylene copolymer consists of ethylene and propylene in the weight ratio of 1 to 18-19.
By adopting the technical scheme, the first ethylene-propylene copolymer can enhance the bending strength and prevent the whitening phenomenon after the draw-bar box is manufactured by adopting the proportion.
The invention is further configured to: the second ethylene propylene copolymer consists of ethylene and propylene in the weight ratio of 5-9 to 93.
By adopting the technical scheme, the second ethylene propylene copolymer can enhance the impact strength by adopting the proportion.
The invention is further configured to: according to the weight portion ratio, the ratio of the first layer raw material to the second layer raw material to the third layer raw material is 1:2: 7.
By adopting the technical scheme, the proportion of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is the optimal proportion, and the manufactured draw-bar box has the optimal performance.
In conclusion, the invention has the following beneficial effects:
1. the mold cost of the invention is very cheap, the cost only needs 3 ten thousand RMB, the mold cost of the traditional polypropylene draw-bar box preparation process is between 60 ten thousand RMB and 70 ten thousand RMB, and the traditional injection molding polypropylene draw-bar box process is very complex, but the preparation process of the multilayer polypropylene co-extrusion composite draw-bar box of the invention is not complex, and the product can be prepared by using a vacuum plastic suction mold.
2. The polypropylene draw-bar box prepared by the traditional injection molding process has larger thickness, so the weight of the product is very heavy, and the polypropylene draw-bar box prepared by the composite material formed by the first layer of raw material, the second layer of raw material and the third layer of raw material has smaller thickness, so the weight is lighter, and the weight problem of the draw-bar box is solved.
3. After drop test, the surface of the draw-bar box manufactured by the invention does not have white marks and does not influence the appearance.
Detailed Description
Example 1:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
step 1: weighing 0.1 part of first ethylene-propylene copolymer and 8 parts of color master batch according to the parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 1 part of second ethylene propylene copolymer, 0.1 part of polypropylene and 8 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 5 parts of polypropylene and 8 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: under the condition of 200 plus material temperature and 300 ℃, a three-layer co-extrusion technology is utilized to enable the first layer raw material, the second layer raw material and the third layer raw material to form a composite material, the composite material is placed in a vacuum forming mold, air is exhausted to form vacuum and form, a plate is baked, and then the composite material is cooled to form a finished product.
The color master batch is purchased from plastic pigment Limited in Hanzhen, and can be selected into orange, white, coffee and other colors according to requirements.
The first ethylene propylene copolymer is composed of propylene and ethylene, wherein the ratio of ethylene to propylene is 1: 18 by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 5: 93.
The second ethylene propylene copolymer comprises propylene and ethylene, wherein the ratio of the ethylene to the propylene is 1: 18 in parts by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 5: 93.
The temperature range of the baking plate is set to be 60-70 ℃.
According to the parts by weight, the ratio of the parts by weight of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is 1:2: 7.
The three-layer co-extrusion technology comprises the following steps: the finished product is formed by co-extruding and compounding an outer layer, a middle layer and an inner layer, wherein a first layer raw material, a second layer raw material and a third layer raw material are respectively added into three extruders for extrusion casting, the extrusion amount of the extruders is 300 kg/h, the extrusion speed is 30m/min, the temperature of a first zone of a screw section of the three extruders is 235 ℃, the temperature of a second zone to a sixth zone is 245-265 ℃, the temperature of a die head zone is 265 ℃, and the cooling temperature of a cooling roller is 18 ℃.
Example 2:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
step 1: weighing 0.5 part of first ethylene-propylene copolymer and 9 parts of color master batch according to the parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 1.5 parts of second ethylene propylene copolymer, 0.2 part of polypropylene and 9 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 6 parts of polypropylene and 9 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: under the condition of 200 plus material temperature and 300 ℃, a three-layer co-extrusion technology is utilized to enable the first layer raw material, the second layer raw material and the third layer raw material to form a composite material, the composite material is placed in a vacuum forming mold, air is exhausted to form vacuum and form, a plate is baked, and then the composite material is cooled to form a finished product.
The color master batch is purchased from plastic pigment Limited in Hanzhen, and can be selected into orange, white, coffee and other colors according to requirements.
The first ethylene-propylene copolymer consists of propylene and ethylene, wherein the weight ratio of ethylene to propylene is 1: 18-19. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene and the propylene is 5-9: 93.
The second ethylene propylene copolymer comprises propylene and ethylene, wherein the ratio of the ethylene to the propylene is 1: 18 in parts by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 6: 93.
The temperature range of the baking plate is set to be 60-70 ℃.
According to the parts by weight, the ratio of the parts by weight of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is 1:2: 7.
The three-layer co-extrusion technology comprises the following steps: the finished product is formed by co-extruding and compounding an outer layer, a middle layer and an inner layer, wherein a first layer raw material, a second layer raw material and a third layer raw material are respectively added into three extruders for extrusion casting, the extrusion amount of the extruders is 300 kg/h, the extrusion speed is 30m/min, the temperature of a first zone of a screw section of the three extruders is 235 ℃, the temperature of a second zone to a sixth zone is 245-265 ℃, the temperature of a die head zone is 265 ℃, and the cooling temperature of a cooling roller is 18 ℃.
Example 3:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
step 1: weighing 1 part of first ethylene-propylene copolymer and 10 parts of color master batch according to the parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 2 parts of second ethylene propylene copolymer, 0.3 part of polypropylene and 10 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 7 parts of polypropylene and 10 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: under the condition of 200 plus material temperature and 300 ℃, a three-layer co-extrusion technology is utilized to enable the first layer raw material, the second layer raw material and the third layer raw material to form a composite material, the composite material is placed in a vacuum forming mold, air is exhausted to form vacuum and form, a plate is baked, and then the composite material is cooled to form a finished product.
The color master batch is purchased from plastic pigment Limited in Hanzhen, and can be selected into orange, white, coffee and other colors according to requirements.
The first ethylene propylene copolymer is composed of propylene and ethylene, wherein the ratio of ethylene to propylene is 1: 18 by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 8: 93.
The temperature range of the baking plate is set to be 60-70 ℃.
According to the parts by weight, the ratio of the parts by weight of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is 1:2: 7.
The three-layer co-extrusion technology comprises the following steps: the finished product is formed by co-extruding and compounding an outer layer, a middle layer and an inner layer, wherein a first layer raw material, a second layer raw material and a third layer raw material are respectively added into three extruders for extrusion casting, the extrusion amount of the extruders is 300 kg/h, the extrusion speed is 30m/min, the temperature of a first zone of a screw section of the three extruders is 235 ℃, the temperature of a second zone to a sixth zone is 245-265 ℃, the temperature of a die head zone is 265 ℃, and the cooling temperature of a cooling roller is 18 ℃.
Example 4:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
step 1: weighing 1.5 parts of a first ethylene-propylene copolymer and 11 parts of a color master batch according to the parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 1-3 parts of second ethylene propylene copolymer, 0.4 part of polypropylene and 11 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 8 parts of polypropylene and 11 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: under the condition of 200 plus material temperature and 300 ℃, a three-layer co-extrusion technology is utilized to enable the first layer raw material, the second layer raw material and the third layer raw material to form a composite material, the composite material is placed in a vacuum forming mold, air is exhausted to form vacuum and form, a plate is baked, and then the composite material is cooled to form a finished product.
The color master batch is purchased from plastic pigment Limited in Hanzhen, and can be selected into orange, white, coffee and other colors according to requirements.
The first ethylene propylene copolymer is composed of propylene and ethylene, wherein the ratio of ethylene to propylene is 1: 19 by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 8: 93.
The temperature range of the baking plate is set to be 60-70 ℃.
According to the parts by weight, the ratio of the parts by weight of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is 1:2: 7.
The three-layer co-extrusion technology comprises the following steps: the finished product is formed by co-extruding and compounding an outer layer, a middle layer and an inner layer, wherein a first layer raw material, a second layer raw material and a third layer raw material are respectively added into three extruders for extrusion casting, the extrusion amount of the extruders is 300 kg/h, the extrusion speed is 30m/min, the temperature of a first zone of a screw section of the three extruders is 235 ℃, the temperature of a second zone to a sixth zone is 245-265 ℃, the temperature of a die head zone is 265 ℃, and the cooling temperature of a cooling roller is 18 ℃.
Example 5:
a preparation process of a multilayer polypropylene co-extrusion composite draw-bar box comprises the following steps:
stepl: weighing 2 parts of a first ethylene-propylene copolymer and 12 parts of a color master batch according to the parts by weight, and mixing to obtain a first layer raw material;
step 2: weighing 3 parts of second ethylene propylene copolymer, 0.5 part of polypropylene and 12 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material;
step 3: weighing 9 parts of polypropylene and 12 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: under the condition of 200 plus material temperature and 300 ℃, a three-layer co-extrusion technology is utilized to enable the first layer raw material, the second layer raw material and the third layer raw material to form a composite material, the composite material is placed in a vacuum forming mold, air is exhausted to form vacuum and form, a plate is baked, and then the composite material is cooled to form a finished product.
The color master batch is purchased from plastic pigment Limited in Hanzhen, and can be selected into orange, white, coffee and other colors according to requirements.
The first ethylene propylene copolymer is composed of propylene and ethylene, wherein the ratio of ethylene to propylene is 1: 19 by weight. The second ethylene propylene copolymer consists of propylene and ethylene, wherein the weight portion of the ethylene to the propylene is 9: 93.
The temperature range of the baking plate is set to be 60-70 ℃.
According to the parts by weight, the ratio of the parts by weight of the first layer of raw materials, the second layer of raw materials and the third layer of raw materials is 1:2: 7.
The three-layer co-extrusion technology comprises the following steps: the finished product is formed by co-extruding and compounding an outer layer, a middle layer and an inner layer, wherein a first layer raw material, a second layer raw material and a third layer raw material are respectively added into three extruders for extrusion casting, the extrusion amount of the extruders is 300 kg/h, the extrusion speed is 30m/min, the temperature of a first zone of a screw section of the three extruders is 235 ℃, the temperature of a second zone to a sixth zone is 245-265 ℃, the temperature of a die head zone is 265 ℃, and the cooling temperature of a cooling roller is 18 ℃.
In examples 1 to 5, the first layer of raw material plays a role in bending resistance and does not generate whitening in a drop test, the second layer of raw material plays a role in impact resistance, and the third layer of raw material can improve the use comfort.
Test experiment 1:
the finished products formed in examples 1-5 were made into cubes of 42cm by 68cm by 26cm and the ability of each material to support and prevent compression was examined by compression testing.
Comparative example 1: a draw-bar box of the same specification was purchased as comparative example 1.
Table 1 shows the stress conditions of examples 1 to 5 and comparative example
Figure BDA0001693572260000061
Note: the displacement of the pressure instrument and the corresponding maximum pressure that can be tolerated in the table are parameters that produce plastic deformation until fatigue failure.
Test experiment 2:
comparative example 2: a 42cm by 68cm by 26cm gauge draw-bar box was purchased commercially as comparative example 2.
Testing the notch impact strength according to GB/1843-2008;
and (3) drop test: the finished product formed in examples 1-5 was made in a cube 42cm by 68cm by 26cm and dropped freely at a height of 90cm, allowing the sides to impact the ground when dropped to the ground and observed visually; freely falls at a height of 60cm, and when falling to the ground, eight corners collide with the ground and are observed by naked eyes.
Table 2 shows the performance of examples 1 to 5 and comparative example 2
Figure BDA0001693572260000062
Figure BDA0001693572260000071
Note: the parts by weight of example 1 was set to 1, and the relative parts by weight of examples 2 to 5 and comparative example 2 were the ratio by weight to example 1.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (3)

1. A preparation process of a multilayer polypropylene co-extrusion composite draw-bar box is characterized by comprising the following steps: the method comprises the following steps:
step 1: weighing 0.1-2 parts of first ethylene propylene copolymer and 8-12 parts of color master batch according to parts by weight, and mixing to obtain a first layer raw material; the first ethylene-propylene copolymer comprises the following components in parts by weight: propylene =1: 18-19 ethylene and propylene;
step 2: weighing 1-3 parts of second ethylene propylene copolymer, 0.1-0.5 part of polypropylene and 8-12 parts of color master batch according to the parts by weight, and mixing to obtain a second layer raw material; the second ethylene propylene copolymer comprises the following components in parts by weight: propylene = 5-9: 93 ethylene and propylene;
step 3: weighing 5-9 parts of polypropylene and 8-12 parts of color master batch as raw materials of a third layer according to the parts by weight;
step 4: sequentially placing the first layer of raw material, the second layer of raw material and the third layer of raw material in a vacuum plastic suction mould at the temperature of 200-;
according to the weight portion ratio, the first layer of raw materials: the second layer of raw materials: third layer raw material =1:2: 7.
2. The preparation process of the multilayer polypropylene co-extrusion composite draw-bar box according to claim 1, which is characterized in that: according to the parts by weight, the second ethylene propylene copolymer is prepared from the following components in parts by weight: propylene = 6-9: 93 of ethylene and propylene.
3. The preparation process of the multilayer polypropylene co-extrusion composite draw-bar box according to claim 1, which is characterized in that: according to the parts by weight, the second ethylene propylene copolymer is prepared from the following components in parts by weight: propylene = 9: 93 of ethylene and propylene.
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