CN110845781B - PE foam material yoga mat and preparation method thereof - Google Patents

PE foam material yoga mat and preparation method thereof Download PDF

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CN110845781B
CN110845781B CN201911137507.0A CN201911137507A CN110845781B CN 110845781 B CN110845781 B CN 110845781B CN 201911137507 A CN201911137507 A CN 201911137507A CN 110845781 B CN110845781 B CN 110845781B
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yoga mat
parts
foaming
weight
foam material
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CN110845781A (en
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马吉增
翟善良
于秀花
马吉成
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Shandong Jicheng Rubber Plastic Co ltd
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Shandong Jicheng Rubber Plastic Co ltd
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    • 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
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Abstract

The invention discloses a PE foam material yoga mat, which relates to the technical field of PE foam materials and is mainly prepared from the following raw materials in parts by weight: 60-90 parts of low-density polyethylene resin, 2-5 parts of chemical foaming agent, 0.4-1 part of auxiliary foaming agent, 2-3 parts of cross-linking agent, 20-30 parts of filler and 1-5 parts of lubricant. The method has the advantage of reducing the phenomena of bubble collapse and the like in the foaming process.

Description

PE foam material yoga mat and preparation method thereof
Technical Field
The invention relates to the technical field of PE materials, in particular to a PE foam material yoga mat and a preparation method thereof.
Background
Polyethylene has excellent physical and chemical properties, and has the advantages of high yield, low price, easy obtainment and the like, thereby being widely applied to various fields. Polyethylene is also one of the earliest commercially applied foamed materials. The foaming material is a substance that can be gasified to generate bubbles inside the substance, and thus becomes a porous substance. The yoga mat is mainly prepared by using a foaming material.
The preparation process of the existing PE foaming material is disclosed in Chinese patent publication No. CN107057166A, and the odorless PE foaming material is mainly prepared from the following raw materials in parts by weight: 50-100 parts of LDPE, 10-40 parts of filler, 1-10 parts of modified foaming agent, 0.1-5 parts of co-foaming agent, 0.1-10 parts of lubricant and 0.5-1 part of odorless cross-linking agent. The preparation method of the odorless PE foaming material comprises the steps of mixing, open milling, sheet discharging, vulcanization foaming and cooling molding processing. According to the invention, the modified foaming agent is added into the PE foaming material, the ammonia content of the product is less than 30ppm, and compared with the traditional PE foaming material, the modified PE foaming material is tasteless, environment-friendly and nontoxic.
The above prior art solutions have the following drawbacks: in the prior art, gas is usually generated through decomposition of a chemical foaming agent, so that bubble holes are generated in polyethylene, but because polyethylene is a typical high-crystallinity polymer, the polyethylene has very high viscoelasticity below a melting point, and the viscosity is sharply reduced when the polyethylene is close to the melting point, the decomposed gas of the chemical foaming agent is very easy to generate phenomena of cell collapse, closing or gas escape in polyethylene resin, so that foaming failure is caused, and the quality of a finished product of the polyethylene foaming material is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the PE foam material yoga mat and the preparation method thereof.
The above object of the present invention is achieved by the following technical solutions:
the PE foam material yoga mat is mainly prepared from the following raw materials in parts by weight:
Figure BDA0002279964100000011
Figure BDA0002279964100000021
by adopting the technical scheme, the low-density polyethylene resin is used as the matrix resin in the yoga mat raw material, the chemical foaming agent generates gas in the matrix resin through decomposition under the assistance of the auxiliary foaming agent, so that the bubble holes generated by gas extrusion are formed in the matrix resin, and the cross-linking agent is added into the raw material while the chemical foaming agent is added, so that a three-dimensional cross-linked reticular structure is formed between polyethylene molecules. The cross-linked network structure formed among the polyethylene molecules enables the structural strength of the polyethylene molecules to be enhanced, air bubbles generated by the chemical foaming agent cannot penetrate easily, and the residual rate of the air bubbles in the matrix resin is improved, so that the phenomena of bubble collapse, bubble closing or gas escape and the like are reduced, the foaming quality of the polyethylene resin is improved, and the production quality of the yoga mat is improved.
The invention is further configured to: the chemical foaming agent is selected from one or more of azodicarbonamide, N-dinitrosopentamethylenetetramine and 4, 4-oxo-bis-benzenesulfonylhydrazide.
By adopting the technical scheme, azodicarbonamide, N-dinitrosopentamethylenetetramine and 4, 4-oxo-bis-benzenesulfonylhydrazide are chemical foaming agents and can be decomposed under the conditions of pressurization and heating to generate gases such as nitrogen, carbon dioxide and the like to foam matrix resin.
The invention is further configured to: the cross-linking agent comprises the following components in percentage by weight:
30-50% of benzoyl peroxide;
40-60% of dicumyl peroxide;
10-20% of polyvinyl alcohol.
By adopting the technical scheme, benzoyl peroxide and dicumyl peroxide are used as main bodies of the cross-linking agent, primary free radicals are generated when the benzoyl peroxide and the dicumyl peroxide are heated and decomposed, and the primary free radicals attack polyethylene macromolecular chains to generate unsaturated double-bond structures (namely polyethylene macromolecular chain free radicals) on the polyethylene macromolecular chains. The polyvinyl alcohol is used as an emulsion stabilizer, and has a good dispersion effect when the benzoyl peroxide and the dicumyl peroxide are mixed with a polyethylene resin matrix, so that the benzoyl peroxide and the dicumyl peroxide are dispersed more uniformly, and the crosslinking effect of the polyethylene resin is improved.
The invention is further configured to: the raw materials are further added with 0.1-0.3 weight part of an auxiliary crosslinking agent, and the auxiliary crosslinking agent is selected from one or more of acrylate, trimethylolpropane trimethacrylate, N-m-phenyl bismaleimide and triallyl isocyanurate.
By adopting the technical scheme, the auxiliary crosslinking agent is added, so that on one hand, the auxiliary crosslinking agent reacts with free radicals on the polymer to form a branched chain of the polymer, and can also react with the free radicals of the polymer to provide an additional crosslinking active point; on the other hand, in the presence of free radicals, the auxiliary crosslinking agent is polymerized into the multi-branched plastic reinforcing filler, so that the effects of adjusting a crosslinking structure, improving the performance of rubber materials, improving the crosslinking efficiency and reducing side reactions are achieved in the crosslinking process.
The invention is further configured to: the filler comprises the following components in percentage by weight:
Figure BDA0002279964100000031
through adopting above-mentioned technical scheme, when calcium carbonate adds into the resin base body as the filler, can improve yoga mat's acid corrosion resistance ability, can decompose the production carbon dioxide when meetting acid to play certain corrosion resisting property. The talcum powder and the kaolin can improve the uniformity and the stability of the generation of air bubbles in the foaming process of the resin, have chemical inertness, high covering capacity and ideal flowing property, have lower cost and have better effect on improving the durability and the mechanical property of solving problems. The graphene oxide structure spans typical scales of general chemistry and material science, has the characteristics of amphoteric molecules, and can improve the affinity performance between calcium carbonate, talcum powder and kaolin and a resin matrix like a surfactant.
The invention is further configured to: the filler is also added with hollow glass beads and hydroxyethyl chitosan, and comprises the following components in percentage by weight:
Figure BDA0002279964100000032
through adopting above-mentioned technical scheme, the hollow glass microballon of extra interpolation in the filler can improve the mechanical strength of resin base member, simultaneously in yoga mat's manufacture process, when the pressed film foams, part hollow glass microballon can take place to break to gas in the release hollow glass microballon plays the supplementary effect that provides gas and produce the bubble, makes when chemical foaming agent produces the bubble, further improves the fine and close degree that the bubble produced, improves the homogeneity that the bubble produced. The hydroxyethyl chitosan mainly plays a role of a surfactant and plays a role of adjusting the interfacial tension between the filler and the resin matrix, so that the filler and the resin matrix are mixed more uniformly and fully.
Meanwhile, the hydroxyethyl chitosan can partially generate a crosslinking effect with polyvinyl alcohol under the action of the crosslinking agent, so that a hydrogel-like material is formed, the hydrogel has a certain self-repairing capability, and the series repairing performance of the yoga mat can be improved to a certain extent. The hydrogel has good water absorption capacity, and can improve the sweat absorption performance of the yoga mat.
The invention is further configured to: the lubricant is selected from one or more of PE wax, stearic acid and zinc stearate.
A preparation method of a PE foam material yoga mat comprises the following steps: the method comprises the following process steps:
s1: adding the raw materials into an internal mixer in proportion for mixing to obtain a mixed material;
s2: adding the mixed material into an open mill for open milling to obtain an open mill material;
s3: adding the open-milled material into a tablet discharging machine for tabletting to obtain tablets;
s4: feeding the material sheet into a flat vulcanizing machine for foaming to obtain a foaming material;
s5: and cutting and processing the foaming material to obtain the finished yoga mat.
By adopting the technical scheme, the raw materials are mixed and foamed through a two-step method, firstly the raw materials are mixed through an internal mixer in step S1 to obtain a uniformly mixed material, then the raw materials are further uniformly mixed through open mixing in step S2, and then the raw materials are foamed through a flat vulcanizing machine, so that the finished product foam yoga mat is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. by adding the cross-linking agent and the auxiliary cross-linking agent into the raw materials, a stable three-dimensional network structure is formed between the resin matrixes, so that the transmittance of bubbles and the collapse of the bubbles in the foaming process are reduced, and the production quality of the yoga mat is improved;
2. by adding the hollow glass beads and the hydroxyethyl chitosan into the filler, the filler improves the mechanical strength and the durability of the resin matrix and improves the uniformity of bubbles in the foaming process.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the invention discloses a preparation method of a PE foam material yoga mat, which comprises the following steps:
s1: adding the raw materials into an internal mixer in proportion for mixing to obtain a mixed material, wherein the raw materials comprise the following components in parts by weight;
Figure BDA0002279964100000051
wherein the chemical foaming agent is azodicarbonamide.
The cross-linking agent comprises the following components in percentage by weight: 30% of benzoyl peroxide, 60% of dicumyl peroxide and 10% of polyvinyl alcohol.
The auxiliary crosslinking agent is trifunctional acrylate.
The filler comprises the following components in percentage by weight: 50% of calcium carbonate, 20% of talcum powder, 10% of kaolin, 10% of graphene oxide, 8% of hollow glass beads and 2% of hydroxyethyl chitosan.
The lubricant is PE wax.
S2: adding the mixed material into an open mill for open milling to obtain an open mill material;
s3: adding the open-milled material into a tablet discharging machine for tabletting to obtain tablets;
s4: feeding the material sheet into a flat vulcanizing machine for foaming to obtain a foaming material;
s5: and cutting and processing the foaming material to obtain the finished yoga mat.
The difference between examples 2-5 and example 1 is that the raw materials are as follows in terms of weight percentage.
Figure BDA0002279964100000052
Examples 6 to 12 differ from example 1 in that the components of the chemical blowing agent are in the following table in weight percent.
Figure BDA0002279964100000061
Examples 13 to 20 differ from example 1 in that the components of the crosslinking agent are in the following table in weight percent.
Figure BDA0002279964100000062
The difference between the examples 21-27 and the example 1 is that the components of the auxiliary crosslinking agent are in the following table in percentage by weight.
Figure BDA0002279964100000063
Figure BDA0002279964100000071
Examples 28 to 39 differ from example 1 in that the components in the filler are in the following table in weight percent.
Figure BDA0002279964100000072
Examples 40 to 45 differ from example 1 in that the components in the lubricant are in the following table in weight percent.
Figure BDA0002279964100000073
Figure BDA0002279964100000081
Comparative example
Comparative example 1 differs from example 1 in that no crosslinking agent was added to the raw materials;
the difference between the comparative example 2 and the example 1 is that no auxiliary crosslinking agent is added in the raw materials;
comparative example 3 differs from example 1 in that no hollow glass microspheres were added to the filler;
comparative example 4 differs from example 1 in that hydroxyethyl chitosan was not added to the filler;
comparative example 5 is different from example 1 in that hollow glass beads and hydroxyethyl chitosan were not added to the filler.
Detection method
1. Density test
Cutting 20cm foam material, weighing, and foaming with the same plate vulcanizer to obtain yoga mat with thickness of 4 mm. The measured sample weight data are shown in the table below.
Examples Weight (g) Density (g/cm)3)
Example 1 0.0144 0.9
Comparative example 1 0.046 2.85
Comparative example 2 0.027 1.69
Comparative example 3 0.022 1.37
Comparative example 4 0.015 0.93
Comparative example 5 0.023 1.43
And (4) conclusion: as can be seen from the data in the table above, the density of the yoga mat obtained in example 1 is greater than that of each of the comparative examples 1 and 2, which indicates that the addition of the cross-linking agent and the auxiliary cross-linking agent has a greater influence on the foaming performance. And as can be seen by comparing the example 1 with the comparative examples 3-5, the foaming effect can be improved to a certain extent by adding the hollow glass beads, and the influence of hydroxyethyl chitosan is weak.
2. Water absorption test
And testing the finished yoga mats of the embodiment 1 and the comparative examples 1-5 by using GB/T8810-88 hard foam water absorption test method. The test results are given in the table below.
Figure BDA0002279964100000082
Figure BDA0002279964100000091
And (4) conclusion: the data test results show that the water absorption of the yoga mat in the example 1 is much higher than that in the comparative examples 1 and 2 by comparing the example 1 with the comparative examples 1 and 2, which indicates that the foaming effect of the yoga mat is enhanced after the cross-linking agent and the auxiliary cross-linking agent are added into the raw material of the yoga mat, so that the water absorption is improved. And comparing the example 1 with the comparative examples 3-5, it can be seen that the addition of the hydroxyethyl chitosan has a large influence on the water absorption rate of the yoga mat, and the result shows that a part of hydrogel is formed after the hydroxyethyl chitosan is added, so that the water absorption rate of the yoga mat is improved.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (6)

1. The PE foam material yoga mat is characterized by being mainly prepared from the following raw materials in parts by weight: 60-90 parts of low-density polyethylene resin; 2-5 parts of a chemical foaming agent; 0.4-1 part of a co-foaming agent; 2-3 parts of a crosslinking agent; 20-30 parts of a filler; 1-5 parts of a lubricant; the filler comprises the following components in percentage by weight: 40-50% of calcium carbonate; 20-30% of talcum powder; 10-20% of kaolin; 10-20% of graphene oxide; 5-10% of hollow glass beads; and 2-3% of hydroxyethyl chitosan.
2. The yoga mat of PE foam material of claim 1, wherein: the chemical foaming agent is selected from one or more of azodicarbonamide, N-dinitrosopentamethylenetetramine and 4, 4-oxo-bis-benzenesulfonylhydrazide.
3. The yoga mat made of PE foam material according to claim 1, wherein: the cross-linking agent comprises the following components in percentage by weight: 30-50% of benzoyl peroxide; 40-60% of dicumyl peroxide; 10-20% of polyvinyl alcohol.
4. The yoga mat of PE foam material of claim 1, wherein: the raw materials are further added with 0.1-0.3 part by weight of an auxiliary crosslinking agent, and the auxiliary crosslinking agent is selected from one or more of trimethylolpropane trimethacrylate, N-m-phenyl bismaleimide and triallyl isocyanurate.
5. The yoga mat of PE foam material of claim 1, wherein: the lubricant is selected from one or more of PE wax, stearic acid and zinc stearate.
6. The method for preparing the PE foam yoga mat of claim 1, wherein the method comprises the following steps: the method comprises the following process steps: s1: adding the raw materials into an internal mixer in proportion for mixing to obtain a mixed material; s2: adding the mixed material into an open mill for open milling to obtain an open mill material; s3: adding the open-milled material into a tablet discharging machine for tabletting to obtain tablets; s4: feeding the material sheet into a flat vulcanizing machine for foaming to obtain a foaming material; s5: and cutting and processing the foaming material to obtain the finished yoga mat.
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CN104127992B (en) * 2014-07-25 2019-05-24 平湖市圣柔得塑业有限公司 A kind of Yoga stick and its manufacturing method
CN104610632A (en) * 2015-01-14 2015-05-13 湖北祥源新材科技有限公司 Colored high-performance and anti-static radiation cross-linked polyethylene foam material and preparation method thereof
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