CN109265815B - Modified EVA (ethylene-vinyl acetate) foam material and preparation method thereof - Google Patents

Modified EVA (ethylene-vinyl acetate) foam material and preparation method thereof Download PDF

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CN109265815B
CN109265815B CN201811154011.XA CN201811154011A CN109265815B CN 109265815 B CN109265815 B CN 109265815B CN 201811154011 A CN201811154011 A CN 201811154011A CN 109265815 B CN109265815 B CN 109265815B
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CN109265815A (en
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丁华雄
陈渠鍫
曹峥
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Sansd Jiangsu Environmental Protection Technology Co ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
    • C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
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    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
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Abstract

The invention discloses a modified EVA foaming material and a preparation method thereof, and the modified EVA foaming material comprises 100 parts of a modified EVA material, 3-6 parts of a foaming agent, 1-3 parts of zinc oxide, 1-2 parts of stearic acid, 0.5-1.0 part of a cross-linking agent and 30-100 parts of a filler; the modified EVA material is a ternary composite foaming material system formed by blending and modifying EVA, SEBS and PA-11. Compared with the prior art, the Shore A hardness of the finished product of the foaming material is reduced to be below 28, which is obviously superior to that of the traditional material by more than 30, and the foaming material is not only soft, but also good in rebound resilience, higher in tensile strength and high in elongation at break.

Description

Modified EVA (ethylene-vinyl acetate) foam material and preparation method thereof
Technical Field
The invention relates to the field of foaming materials, in particular to a modified EVA foaming material and a preparation method thereof.
Background
The foaming material is a foaming substance which is gasified in the substance to generate bubbles so as to be a porous substance, has the advantages of light weight, high specific strength, excellent insulating property, remarkable buffering capacity and strong adsorption capacity, and is widely applied to the fields of automobile industry, building industry, packaging industry, agriculture, water treatment, air filtration and the like; such as making foam, foam rubber, foam resin, etc.
The main characteristic of polyolefin (mainly polyethylene or EVA) foam floor mats applied to children's crawling pads and home decoration materials is to have a certain flexibility and rigidity, i.e. a combination of elasticity and plasticity. However, in general, the resilience is insufficient and the comfort of stepping on the foot is insufficient. The shore a hardness of typical polyethylene or EVA foam mats is greater than 30 °, normally around 38 °.
More demands are made on the elasticity of the foam ground mat at present, and the foam ground mat is required to be more elastic, softer, comfortable in foot feeling and not easy to fatigue. And the foot surface and the foam ground mat as well as the foam ground mat and the ground are not easy to slide, so that the anti-slip shoe has a certain anti-slip effect and prevents old people and children from falling down.
However, after the elasticity of most of the existing foam ground mats is improved, the tensile strength is reduced to a certain extent, and how to balance the two, so that the foam ground mats are worth researching.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides a modified EVA foaming material and a preparation method thereof, the Shore hardness of the prepared high-elasticity foaming material is reduced to be below 28, the elasticity and flexibility of the foaming material are integrally improved, and meanwhile, the high-elasticity foaming material is high in tensile strength and good in comprehensive mechanical property.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme: a modified EVA foaming material comprises the following preparation raw materials by weight: 100 parts of modified EVA material, 3-6 parts of foaming agent, 1-3 parts of zinc oxide, 1-2 parts of stearic acid, 0.5-1.0 part of cross-linking agent and 30-100 parts of filler; the modified EVA material is a ternary composite foaming material system formed by blending and modifying EVA, SEBS and PA-11.
The prepared foaming material after the EVA and the SEBS are blended has the advantages that the softness and the elasticity of the material are greatly improved, the hardness is reduced to a certain degree, the tensile strength is effectively improved to a certain degree after the PA-11 is added, and therefore the mechanical property of the foaming material is further improved.
More preferably, the blend ratio of EVA, SEBS and PA-11 in the modified EVA material is EVA 50-70%, SEBS 10-20%, and the balance of PA-11.
More preferably, the preparation of the modified EVA material by using a supercritical carbon dioxide intermittent high-pressure reaction kettle foaming method specifically comprises the following steps:
(1) drying EVA, SEBS and PA-11 according to a blending ratio, and then blending and granulating by a double-screw extruder to obtain a ternary composite material;
(2) placing the ternary composite material in a high-pressure reaction kettle, continuously introducing carbon dioxide for 4 times, and discharging; and continuously introducing carbon dioxide to adjust the pressure to 15MPa, adjusting the temperature to 300 ℃, keeping the pressure unchanged for 20min, then adjusting the temperature to 150 ℃, adjusting the pressure of the discharged part of the carbon dioxide to 10MPa, keeping the pressure unchanged for 40min, then adjusting the temperature to 80 ℃, keeping the pressure unchanged for 10MPa, then keeping the pressure unchanged for 20min, then heating to 220 ℃, introducing the carbon dioxide to the saturated pressure, keeping the temperature for 1h, then discharging the carbon dioxide, taking out the ternary composite material, cooling and sizing to obtain the modified EVA material.
More preferably, the VA content of the EVA is 10-20%.
More preferably, the melt index MI value of the SEBS ranges from 3.0 to 5.0g/10 min.
More preferably, the foaming agent is 4, 4' -oxybis-benzenesulfonyl hydrazide.
More preferably, the crosslinking agent is di-tert-butylperoxydiisopropylbenzene.
More preferably, the filler is at least one of talc powder and calcium carbonate.
The invention also discloses a preparation method of the modified EVA foaming material, which comprises the following steps: preparing the required raw materials as required, placing the raw materials in a closed rubber mixing mill for mixing and plasticating, placing the raw materials in an internal mixer for mixing, and carrying out open milling, sheet discharging, vulcanization foaming, cooling forming, cutting, blanking and printing to obtain the required modified EVA foaming material.
Has the advantages that: compared with the prior art, the modified EVA foaming material and the preparation method thereof provided by the invention have the following advantages:
(1) the Shore A hardness of the finished product of the foaming material is reduced to be below 28, which is obviously superior to that of the traditional material by more than 30.
(2) The finished product of the foaming material is soft, and has good rebound resilience, higher tensile strength and high elongation at break.
(3) The preparation material does not contain harmful substances such as formaldehyde, plasticizer, chloride and the like, and is safe and environment-friendly.
Detailed Description
The preparation methods of the modified EVA materials of examples 1-7 and comparative examples 1-2 are as follows:
(1) drying EVA, SEBS and PA-11 according to a blending ratio, and then blending and granulating by a double-screw extruder to obtain a ternary composite material;
(2) placing the ternary composite material in a high-pressure reaction kettle, continuously introducing carbon dioxide for 4 times, and discharging; and continuously introducing carbon dioxide to adjust the pressure to 15MPa, adjusting the temperature to 300 ℃, keeping the pressure unchanged for 20min, then adjusting the temperature to 150 ℃, adjusting the pressure of the discharged part of the carbon dioxide to 10MPa, keeping the pressure unchanged for 40min, then adjusting the temperature to 80 ℃, keeping the pressure unchanged for 10MPa, then keeping the pressure unchanged for 20min, then heating to 220 ℃, introducing the carbon dioxide to the saturated pressure, keeping the temperature for 1h, then discharging the carbon dioxide, taking out the ternary composite material, cooling and sizing to obtain the modified EVA material.
Example 1:
a modified EVA foaming material comprises the following preparation raw materials by weight: 4kg of modified EVA (EVA 50%, SEBS 20%, PA-1130%), 200g of 4, 4' -oxybis-benzenesulfonylhydrazide (OBSH), 80g of zinc oxide, 60g of stearic acid, 40g of di-tert-butyl peroxyisopropylbenzene (BIBP) and 2.4kg of talcum powder. Wherein the VA content of EVA is 12%, the manufacturer is DuPont, the MI value of the melt index of SEBS is 4.0g/10min, and the manufacturer is Keteng; PA-11 manufacturer is Asahi Kasei (Asahi Kasei).
The preparation method comprises the following steps: preparing the required raw materials as required, placing the raw materials in a closed rubber mixing mill for mixing and plasticating, placing the raw materials in an internal mixer for mixing, and carrying out open milling, sheet discharging, vulcanization foaming, cooling forming, cutting, blanking and printing to obtain the required modified EVA foaming material.
Example 2-example 7:
the mixture ratio of the three components except the modified EVA is different, and the types and the dosages of other preparation raw materials are the same as those of the raw materials in the example 1; the preparation method is also the same as that of the embodiment 1, the mixture ratio of the three components in the embodiments 2 to 7 is specifically shown in the table 1, and the foaming materials are respectively prepared under the condition that the mass percentages of EVA are respectively 50%, 60% and 70%, and the mass percentages of SEBS are respectively 20% and 10%.
Comparative example 1:
only EVA and SEBS are used for binary blending in the process of removing modified EVA, the specific proportion is shown in Table 1, and the types and the use amounts of other preparation raw materials are the same as those of the raw materials in the example 1; and the preparation method is also the same as that of example 1.
Comparative example 2:
only EVA and PA-11 are used for binary blending in the modified EVA, the specific proportion is shown in Table 1, and the types and the use amounts of other preparation raw materials are the same as those of the raw materials in the example 1; and the preparation method is also the same as that of example 1.
Comparative example 3:
the modified EVA is not used, the common EVA material is adopted for preparation, and the types and the use amounts of other preparation raw materials are the same as those of the example 1; the preparation method is the same as that of example 1.
The finished product testing method comprises the following steps:
determination method of Shore A hardness:
the test was carried out according to GB/T530-1999 "method for testing indentation hardness of rubber pocket durometer", International Standard ISO7619:1986, durometer model number: LX-A Shore durometer.
Determination of elongation at break and tensile strength:
the model of an electronic universal tester using instruments according to GB/T6344-2008 "determination of tensile strength and elongation at break of Flexible foam Polymer material": shimadzu AGS-X5 KN. The size of the sample is 140mm multiplied by 12mm multiplied by 10mm, and the cross section is rectangular; the stretching speed is 500mm/min +/-50 mm/min; the measurement temperature is 23 ℃ plus or minus 2 ℃, and the relative humidity is 50 percent plus or minus 5 percent.
Table 1: comparison of modified EVA foaming materials prepared from modified EVA materials with different proportions
Figure BDA0001818510340000041
As can be seen from Table 1, the hardness of the finished modified EVA foam materials prepared from the modified EVA materials of examples 1-7 of the invention is lower than 28, the elongation at break is higher, the tensile strength is obviously improved compared with the comparative example 1 without PA-11, the hardness is greatly reduced compared with the comparative example 2 without SEBS and the comparative example 3 without modified EVA, and the comprehensive performance is better, and the foam materials prepared from the example 7 with the proportion of 60% of EVA and 15% of SEBS have better comprehensive mechanical properties.
The Shore A hardness of the finished product of the modified EVA foaming material is reduced to below 28, is obviously superior to that of the conventional material by more than 30, and the modified EVA foaming material is soft, good in rebound resilience, high in tensile strength and high in elongation at break.
It should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the scope of the present invention.

Claims (7)

1. The modified EVA foaming material is characterized by comprising the following preparation raw materials by weight: 100 parts of modified EVA material, 3-6 parts of foaming agent, 1-3 parts of zinc oxide, 1-2 parts of stearic acid, 0.5-1.0 part of cross-linking agent and 30-100 parts of filler; the modified EVA material is a ternary composite foaming material system formed by blending and modifying EVA, SEBS and PA-11; in the modified EVA material, EVA,
The blend ratio of the SEBS and the PA-11 is 50-70 percent of EVA, 10-20 percent of SEBS and the balance of PA-11;
the preparation method of the modified EVA material by adopting a supercritical carbon dioxide intermittent high-pressure reaction kettle foaming method comprises the following steps:
(1) drying EVA, SEBS and PA-11 according to a blending ratio, and then blending and granulating by a double-screw extruder to obtain a ternary composite material;
(2) placing the ternary composite material in a high-pressure reaction kettle, continuously introducing carbon dioxide for 4 times, and discharging; and continuously introducing carbon dioxide to adjust the pressure to 15MPa, adjusting the temperature to 300 ℃, keeping the pressure unchanged for 20min, then adjusting the temperature to 150 ℃, adjusting the pressure of the discharged part of the carbon dioxide to 10MPa, keeping the pressure unchanged for 40min, then adjusting the temperature to 80 ℃, keeping the pressure unchanged for 10MPa, then keeping the pressure unchanged for 20min, then heating to 220 ℃, introducing the carbon dioxide to the saturated pressure, keeping the temperature for 1h, then discharging the carbon dioxide, taking out the ternary composite material, cooling and sizing to obtain the modified EVA material.
2. The modified EVA foam of claim 1, wherein: the VA content of the EVA is 10-20%.
3. The modified EVA foam of claim 1, wherein: the melt index MI value of the SEBS ranges from 3.0 to 5.0g/10 min.
4. The modified EVA foam of claim 1, wherein: the foaming agent is 4, 4' -oxybis-benzenesulfonyl hydrazide.
5. The modified EVA foam of claim 1, wherein: the cross-linking agent is di-tert-butylperoxy diisopropylbenzene.
6. The modified EVA foam of claim 1, wherein: the filler is at least one of talcum powder and calcium carbonate.
7. The method for preparing the modified EVA foam material of claim 1, which comprises the following steps: preparing the required raw materials as required, placing the raw materials in a closed rubber mixing mill for mixing and plasticating, placing the raw materials in an internal mixer for mixing, and carrying out open milling, sheet discharging, vulcanization foaming, cooling forming, cutting, blanking and printing to obtain the required modified EVA foaming material.
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