CN111138705A - Preparation method of foaming floating ball - Google Patents
Preparation method of foaming floating ball Download PDFInfo
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- CN111138705A CN111138705A CN202010022963.7A CN202010022963A CN111138705A CN 111138705 A CN111138705 A CN 111138705A CN 202010022963 A CN202010022963 A CN 202010022963A CN 111138705 A CN111138705 A CN 111138705A
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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
- C08J9/08—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 carbon dioxide
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- 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
- C08J9/0014—Use of organic additives
- C08J9/0033—Use of organic additives containing sulfur
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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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- C08J9/0038—Use of organic additives containing phosphorus
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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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
- C08J9/0066—Use of inorganic compounding ingredients
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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
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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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
- 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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08J2377/00—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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- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08J2491/06—Waxes
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Abstract
The invention discloses a preparation method of a foaming floating ball, which relates to the field of foaming plastics and mainly comprises the following steps: step one, weighing 75-85 parts of PP, 3-9 parts of foaming agent, 2-4 parts of surfactant and 11-15 parts of other auxiliary agents for raw material preparation; step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass; step three, injecting the molten mass in the step two into a mould for molding; and fourthly, pulling the molded floating ball out of the mold by using a tractor. By adopting the technical scheme, the surfactant is added into the PP raw material, so that the foaming agent can be uniformly distributed in the PP raw material, and the PP raw material can be uniform in the foaming process.
Description
Technical Field
The invention relates to the field of foamed plastics, in particular to a preparation method of a foamed floating ball.
Background
The foaming floating ball has the advantages of light weight, heat insulation, buffering, insulation, corrosion prevention, low price and the like, so the foaming floating ball is widely applied to daily necessities, packaging, industry, agriculture, transportation industry, military industry and aerospace industry, and the development of the foaming floating ball is very rapid since the 20 th century and the 90 th year in China. The existing foaming floating ball has a series of characteristics of small density, high specific strength, strong energy absorption capacity, good sound insulation and heat insulation performance and the like.
However, many of the existing foaming floating balls are made by taking PP as a main material and adding a certain proportion of foaming agent to mix and heat. Although these foaming floating balls also have the characteristics of common foaming floating balls, the general closed holes in the foaming floating balls are rough, and the outer surfaces of the foaming floating balls are rough, so that the foaming of the whole floating ball is uneven, and when the foaming floating balls are used for detecting the liquid level, the foaming floating balls are always inclined by a large range when floating up and down, so that the accuracy of liquid level detection is influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a foaming floating ball, and the foaming effect of the foaming floating ball is uniform, so that the method has higher accuracy in the process of detecting the liquid levels of a water tank of a water dispenser and other containers.
The above object of the present invention is achieved by the following technical solutions: a preparation method of a foaming floating ball comprises the following steps,
step one, weighing 75-85 parts of PP, 3-9 parts of foaming agent, 2-4 parts of surfactant and 11-15 parts of other auxiliary agents for raw material preparation;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
By adopting the technical scheme, the surfactant is added into the PP raw material, so that the foaming agent can be uniformly distributed in the PP raw material, and the PP raw material can be uniform in the foaming process.
Preferably, the heating of the plastic injection molding machine in the second step is performed by a microwave generator.
Through adopting above-mentioned technical scheme, utilize microwave generator to take place the microwave to the raw materials in the plastic injection molding machine and heat, can make original inside and surface heated simultaneously like this, the speed of the whole foaming of raw materials will be comparatively even like this to the foaming effect of final foaming floater has just also further been guaranteed comparatively evenly.
Preferably, the microwave generator generates microwaves with a frequency of 5400MHz to 8200 MHz.
By adopting the technical scheme, the frequency of the microwave is controlled to be 5400MHz to 8200MHz, so that the raw materials can be fully melted in the plastic injection molding machine on one hand, and the influence on the final quality of the foaming floating ball due to the too high foaming speed of the foaming agent can be avoided on the other hand.
Preferably, the foaming agent is one of calcium carbonate, magnesium carbonate and sodium bicarbonate.
By adopting the technical scheme, the calcium carbonate, the magnesium carbonate and the sodium bicarbonate are all carbonates, carbon dioxide can be generated in the heating decomposition process, on one hand, the foaming effect of the PP can be realized, and on the other hand, calcium, magnesium and sodium ions are beneficial to forming of the foaming floating ball, so that the environmental pollution can be reduced, and the foaming quality of the PP can be improved.
Preferably, the foaming agent is subjected to a soaking treatment with one of acrylic acid, maleic acid and epoxy acrylate.
By adopting the technical scheme, acrylic acid, maleic acid or acrylic epoxy ester has a grafting effect, and the mutual connection effect between the foaming agent and PP can be effectively improved, so that the mechanical property of the foaming floating ball can be remarkably improved.
Preferably, the other auxiliary agents comprise 4-6 parts of white oil, 4-5 parts of iodized salt and 3-4 parts of antioxidant.
By adopting the technical scheme, the white oil is added to firstly play a role in lubricating the raw materials, so that the materials are fully mixed. And secondly, part of the white oil is attached to the surface of the foaming floating ball, so that the smoothness of the surface of the foaming floating ball is improved. Thus being beneficial to ensuring the integral uniformity of the foaming floating ball.
Preferably, the surfactant is one or a mixture of two of sodium dodecyl benzene sulfonate and potassium lauryl phosphate.
By adopting the technical scheme, the sodium dodecyl benzene sulfonate and the potassium lauryl phosphate are anionic surfactants which can be matched with white oil, and the migration of substances in the foaming floating ball to water in the water tank can be effectively reduced, so that the influence on the health of people caused by the substances in the foaming floating ball entering the human body in the drinking process is avoided.
Preferably, the iodide salt is one of lithium iodide and cuprous iodide.
By adopting the technical scheme, the iodide salt is beneficial to improving the thermal stability of PP in the foaming floating ball, particularly lithium iodide and cuprous iodide, lithium ions and cuprous ions can be matched with alkyl and carbonyl in PP and nylon, so that a structure similar to a network is generated, the movement of molecular chains of PP and nylon and corresponding free radicals is blocked, and therefore, a polymer molecular chain needs to overcome a larger energy barrier than a completely free molecular chain when being thermally decomposed, and the thermal decomposition temperature is higher.
Preferably, the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of the N-phenyl- α -naphthylamine to the benzofuranone is 1: 1.
By adopting the technical scheme, firstly, N-phenyl- α -naphthylamine can react with radicals R, ROO and R which are grown in the chain in the polypropylene oxidation reaction to generate stable compounds and terminate the growth of chain segments in the chain reaction, but the oxygen content in a water tank is not very high generally, so that the N-phenyl- α -naphthylamine is difficult to completely capture alkyl radicals, and at the moment, the benzofuranone can be used as a hydrogen donor on one hand, and can be aggregated with macromolecular radicals, particularly the alkyl radicals on the other hand, so that the oxidation resistance of the foaming floating ball can be effectively improved.
In conclusion, the beneficial technical effects of the invention are as follows:
1. firstly, some surfactants are added into PP, so that a foaming agent is favorably and uniformly dispersed in the PP, and the PP is enabled to be relatively uniform as a whole in the foaming process;
2. the microwave is used as a heating source, so that the interior and the surface of the mixed raw materials can be synchronously heated, the synchronous foaming of the raw materials can be ensured, and the uniformity of the foamed floating ball is further ensured;
3. the addition of the white oil improves the dispersibility of the materials, and simultaneously ensures that the surface of the foaming floating ball is smoother, thereby being beneficial to ensuring the uniformity of the foaming floating ball;
4. the addition of the iodide salt is beneficial to improving the thermal stability of the foaming floating ball, so that the foaming floating ball has longer service life even if the temperature of the contacted liquid is higher;
5. the sodium dodecyl benzene sulfonate or potassium lauryl phosphate and the white oil are used in a matching way, so that the foamed floating ball is beneficial to limiting various substances in the ball body, and the probability of the substances of the foamed floating ball migrating into the water body is reduced.
Drawings
FIG. 1 is a flow chart of a preparation process of a foaming floating ball.
Detailed Description
The present invention is described in further detail below with reference to fig. 1.
The first embodiment is as follows:
a preparation method of a foaming floating ball comprises the following steps,
step one, weighing 75Kg of PP, 3Kg of calcium carbonate, 2Kg of sodium dodecyl benzene sulfonate and 11Kg of other additives to prepare raw materials;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
Wherein, the plastic injection molding machine in the second step is heated by generating microwaves with the frequency of 5400MHz by a microwave generator, and the other auxiliary agents are 4Kg of white oil, 4Kg of lithium iodide and 3Kg of antioxidant, wherein, the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of the N-phenyl- α -naphthylamine to the benzofuranone is 1: 1, and in addition, calcium carbonate is soaked in acrylic acid for 0.5h in advance.
Example two:
a preparation method of a foaming floating ball comprises the following steps,
weighing 80KgPP, 6Kg of magnesium carbonate, 3Kg of potassium lauryl phosphate and 13Kg of other additives for preparing raw materials;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
Wherein, the plastic injection molding machine in the second step is heated by microwave with the frequency of 6800MHz generated by a microwave generator, and other auxiliary agents are 5Kg of white oil, 4.5Kg of cuprous iodide and 3.5Kg of antioxidant, wherein, the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of the N-phenyl- α -naphthylamine to the benzofuranone is 1: 1, and in addition, the magnesium carbonate is soaked for 0.5h before the maleic acid.
Example three:
a preparation method of a foaming floating ball comprises the following steps,
weighing 85Kg of PP, 9Kg of sodium bicarbonate, 4Kg of sodium dodecyl benzene sulfonate and 15Kg of other additives to prepare raw materials;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
Wherein, the plastic injection molding machine in the second step is heated by the microwave with the frequency of 8200MHz generated by a microwave generator, and other auxiliary agents are 6Kg of white oil, 5Kg of lithium iodide and 4Kg of antioxidant, wherein, the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of the N-phenyl- α -naphthylamine to the benzofuranone is 1: 1, and in addition, sodium bicarbonate is soaked for 0.5h before the acrylic acid epoxy ester.
Example four:
a preparation method of a foaming floating ball comprises the following steps,
step one, weighing 80KgPP, 9Kg of magnesium carbonate, 3Kg of potassium lauryl phosphate and 13Kg of other auxiliary agents for preparing raw materials;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
Wherein the plastic injection molding machine in the second step is heated by microwave with frequency of 6800MHz generated by a microwave generator, and other auxiliary agents are 5Kg of white oil, 4.5Kg of cuprous iodide and 3.5Kg of antioxidant, wherein the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of N-phenyl- α -naphthylamine to benzofuranone is 1: 1, and in addition, magnesium carbonate is soaked in acrylic acid for 0.5h in advance.
Comparative example one:
this comparative example differs from example four in that potassium lauryl phosphate was not added.
Comparative example two:
the difference between the comparative example and the fourth example is that the heating mode of the second step is heating by heat conduction oil.
Comparative example three:
this comparative example differs from example four in that no white oil was added.
Example five:
a preparation method of a foaming floating ball comprises the following steps,
step one, weighing 75Kg of PP, 6Kg of calcium carbonate, 29Kg of nylon, 2Kg of sodium dodecyl benzene sulfonate and 15Kg of other additives to prepare raw materials;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
Wherein, the plastic injection molding machine in the second step is heated by the microwave with the frequency of 8200MHz generated by a microwave generator, and other auxiliary agents are 6Kg of white oil, 5Kg of lithium iodide and 4Kg of antioxidant, wherein, the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of the N-phenyl- α -naphthylamine to the benzofuranone is 1: 1, in addition, calcium carbonate is soaked for 0.5h before acrylic acid epoxy ester.
Comparative example four:
this comparative example differs from example five in that the antioxidants were all N-phenyl- α -naphthylamine.
Comparative example five:
this comparative example differs from example five in that the antioxidants were all benzofuranones.
Examples one to five and comparative examples one to five were tested according to the following test methods:
1. observing whether the foaming floating ball is a uniform ball;
2. observing whether the surface of the foaming floating ball is smooth or not;
3. detecting the material migration quantity: according to the standard GB4806.7-2016, the total migration of detection indexes in acetic acid, ethanol and olive oil is less than or equal to 10mg/dm3；
4. The foaming floating ball is placed in boiling water at 100 ℃ for 72 hours, and whether the foaming floating ball turns yellow or not is observed.
The results of the specific tests are shown in table one below:
watch 1
| Detection of Item | Ball body Whether or not to Uniformity | Surface of Whether or not to Is smooth and smooth | Total migration volume (water, 100 deg.c, 2h） | total migration (4% Acetic acid, at a temperature of 70 ℃, 2h） | total migration volume (95% ethanol, 70) ℃，2h） | Total transference rate of olive Olive oil, at a temperature of 40 ℃, 240h） | whether or not to Yellowing of |
| Practice of Example one | Uniformity | Is smooth and smooth | 0.10 | 0.34 | 0.79 | 0.65 | Is not changed Yellow colour |
| Practice of Example two | Uniformity | Is smooth and smooth | 0.12 | 0.36 | 0.76 | 0.64 | Is not changed Yellow colour |
| Practice of EXAMPLE III | Uniformity | Is smooth and smooth | 0.11 | 0.35 | 0.78 | 0.65 | Is not changed Yellow colour |
| Practice of Example four | Uniformity | Is smooth and smooth | 0.12 | 0.38 | 0.80 | 0.67 | Is not changed Yellow colour |
| Comparison of Example one | With a concave Trap for storing food | Is smooth and smooth | 2.40 | 10.34 | 4.51 | 3.75 | Is not changed Yellow colour |
| Comparison of Example two | With a concave Trap for storing food | Is smooth and smooth | 0.13 | 0.49 | 0.91 | 0.73 | Is not changed Yellow colour |
| Comparison of EXAMPLE III | Uniformity | Roughness of | 2.71 | 8.64 | 4.36 | 3.79 | Is not changed Yellow colour |
| Practice of Example five | Uniformity | Is smooth and smooth | 0.13 | 0.40 | 0.79 | 0.66 | Is not changed Yellow colour |
| Comparison of Example four | Uniformity | Is smooth and smooth | 0.16 | 0.45 | 0.84 | 0.72 | Light yellow |
| Comparison of Example five | Uniformity | Is smooth and smooth | 0.14 | 0.42 | 0.86 | 0.74 | Light yellow |
As can be seen from the first table, the foamed floating ball prepared by the method is uniform in whole. Particularly, as can be seen from the comparison between example four and comparative examples one and two, the uniformity of the foaming of the floating ball can be effectively ensured only when the surfactant is added to the raw material and the heating is performed in the microwave environment.
Furthermore, as can be seen from the comparison between the example four and the comparative examples one and three, the foamed floating ball can not easily migrate to water and organic solvents only when the surfactant and the white oil coexist, so that the related standard of food grade GB4806.7-2016 is met.
Finally, as can be seen from the comparison between the fifth embodiment and the fourth and fifth embodiments, when the antioxidant compounded by N-phenyl- α -naphthylamine and benzofuranone is added into PP, the antioxidant property of the foamed floating ball is much better than that of the antioxidant added singly, therefore, the whole liquid level can be accurately tested in the liquid container such as the water tank of the water dispenser.
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 (9)
1. A preparation method of a foaming floating ball is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step one, weighing 75-85 parts of PP, 3-9 parts of foaming agent, 2-4 parts of surfactant and 11-15 parts of other auxiliary agents for raw material preparation;
step two, adding the raw materials obtained in the step one into a plastic injection molding machine for heating and melting to obtain a molten mass;
step three, injecting the molten mass in the step two into a mould for molding;
and fourthly, pulling the molded floating ball out of the mold by using a tractor.
2. The method for preparing the foaming floating ball according to claim 1, wherein the method comprises the following steps: and in the second step, the heating of the plastic injection molding machine is carried out through a microwave generator.
3. The method for preparing the foaming floating ball according to claim 2, wherein the method comprises the following steps: the microwave generator generates microwaves with the frequency of 5400MHz to 8200 MHz.
4. The method for preparing the foaming floating ball according to claim 1, wherein the method comprises the following steps: the foaming agent is one of calcium carbonate, magnesium carbonate and sodium bicarbonate.
5. The method for preparing the foaming floating ball according to claim 4, wherein the method comprises the following steps: the foaming agent is soaked in one of acrylic acid, maleic acid and epoxy acrylate.
6. The method for preparing the foaming floating ball according to claim 1, wherein the method comprises the following steps: the other auxiliary agents comprise 4-6 parts of white oil, 4-5 parts of iodized salt and 3-4 parts of antioxidant.
7. The method for preparing the foaming floating ball according to claim 6, wherein the method comprises the following steps: the surfactant is one or a mixture of two of sodium dodecyl benzene sulfonate and potassium lauryl phosphate.
8. The method for preparing the foaming floating ball according to claim 6, wherein the method comprises the following steps: the iodide salt is one of lithium iodide and cuprous iodide.
9. The method for preparing the floating foam ball as claimed in claim 6, wherein the antioxidant is a mixture of N-phenyl- α -naphthylamine and benzofuranone, and the mass ratio of N-phenyl- α -naphthylamine to benzofuranone is 1: 1.
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