A method for producing a marine ps buoy recycled plastic product

Abstract

The present application relates to the technical field of B29B17 / 00, and particularly relates to a preparation method of a marine PS buoy recycled plastic product. The method comprises the following steps: S1. cleaning, crushing and impurity removing of the recycled marine PS buoy to obtain crushed material; S2. surface treatment of the crushed material to obtain treated material a; S3. heating and pressure treatment of the treated material a to obtain treated material b; S4. mixing of the treated material b, a flame retardant and expandable EPS, and then adding the mixture into an extruder to heat and extrude to obtain the marine PS buoy recycled plastic product. The preparation method can improve the utilization efficiency of the marine PS buoy recycled plastic.

Description

Technical Field

[0001] This invention relates to the technical field of B29B17 / 00, and specifically to a method for preparing a marine PS buoy made of recycled plastic. Background Technology

[0002] With the widespread application of polystyrene foam materials in various fields, a large number of PS floats are now used in marine aquaculture. However, if PS floats cannot be recycled, they will cause pollution to the marine environment. Therefore, recycling marine PS floats can solve the problem of pollution to the marine environment, and the recycling of marine PS floats has also gained recognition from all sectors of society.

[0003] Chinese patent application number CN201410678423.9 discloses a method for recycling polystyrene resin foam material. It uses citrus oil to dissolve the polystyrene resin foam material, evaporates the solvent to recover the resin, and then foams and molds it again to produce recycled foam material. However, the dissolution and processing process requires a reaction time of 3-10 hours, which is a relatively long processing time.

[0004] Therefore, providing a method to improve the utilization of recycled PS floats is a major technical problem that needs to be solved. Summary of the Invention

[0005] To address the above problems, this invention provides a method for preparing a marine PS buoy made of recycled plastic, comprising the following steps:

[0006] S1. The recovered marine PS floats are cleaned, crushed, and impurities are removed to obtain crushed material;

[0007] S2. Surface-treat the pulverized material to obtain treated material a;

[0008] S3. Heat and pressurize the material a to obtain the material b;

[0009] S4. After mixing the treated material b, flame retardant, and expandable EPS, add the mixture to an extruder and heat and extrude it to obtain a recycled plastic product containing marine PS floats.

[0010] As a preferred technical solution of the present invention, the insulation board is obtained by heating and extrusion in step S4.

[0011] As a preferred embodiment of the present invention, the particle size of the pulverized material in S1 is less than 5 mm.

[0012] As a preferred technical solution of the present invention, the processing time for washing, crushing and removing impurities from the recovered marine PS float in step S1 to obtain the crushed material is generally 30-60 minutes.

[0013] As a preferred technical solution of the present invention, in step S2, after obtaining the pulverized material, the pulverized material is surface treated with a surface treatment agent and then heated and pressurized.

[0014] As a preferred technical solution of the present invention, S4 contains, by weight, 20-30 parts of treatment material b, 0.1-0.5 parts of flame retardant, and 70-80 parts of expandable EPS.

[0015] As a preferred technical solution of the present invention, the steps for obtaining treated material a by surface treatment of pulverized material using a surface treatment agent include: first, adding the surface treatment agent to water to obtain a treatment solution, wherein the mass concentration of the surfactant in the treatment solution is 3-8 wt%; second, adding the treatment solution to a stirring device, adding the pulverized material to the stirring device, and stirring for 5-10 minutes; the rotation speed of the stirring device is 100-200 r / min; the amount of pulverized material added is such that the surface of the pulverized material is wetted when the stirring device is turned on.

[0016] As a preferred technical solution of the present invention, the stirring time for S2 to perform surface treatment on the pulverized material to obtain the treated material a is 5-10 min.

[0017] As a preferred embodiment of the present invention, the surface treatment agent is selected from one or both of anionic surfactants and nonionic surfactants.

[0018] As a preferred embodiment of the present invention, the anionic surfactant is selected from one or more of alkylbenzene sulfonates, fatty acid sulfonyl esters, fatty acid sulfonyl amides, and phosphate salts.

[0019] As a preferred embodiment of the present invention, the alkylbenzene sulfonate is selected from one or more of sodium dodecylbenzene sulfonate, potassium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfonate, and ammonium dodecylbenzene sulfonate.

[0020] As a preferred embodiment of the present invention, the nonionic surfactant is selected from one or more of alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene alkylamine, polyoxyethylene alkylolamide, and Tween T-20.

[0021] As a preferred embodiment of the present invention, the surface treatment agent is a mixture of anionic surfactant and nonionic surfactant, wherein the weight ratio of the anionic surfactant to the nonionic surfactant is 1:(1-2).

[0022] As a preferred embodiment of the present invention, the surface treatment agent is a mixture of sodium hexadecylbenzenesulfonate and Tween T-20, wherein the weight ratio of sodium hexadecylbenzenesulfonate to Tween T-20 is 1:(1-2).

[0023] As a preferred technical solution of the present invention, the temperature at which the processing material a is heated in S3 is 85-98℃.

[0024] As a preferred technical solution of the present invention, the heating time of the processing material a in S3 is 3-5 minutes.

[0025] As a preferred technical solution of the present invention, the pressure for pressurizing the material a in S3 is 5-20 MPa.

[0026] As a preferred technical solution of the present invention, the pressurization time for the processing material a in S3 is 5-10 minutes.

[0027] To improve the thermal insulation effect of recycled plastic products containing marine PS floats, the inventors creatively discovered in experiments that heating and pressurizing the treated material a can reduce the thermal conductivity of the recycled plastic products containing marine PS floats, thereby improving their thermal insulation effect. The possible reason is that heating and pressurizing the treated material a can combine the surfactant impregnated on its surface with the pulverized material, improving the surface fusion ability between the interfaces of the mixture when the treated material b is mixed with flame retardants and expandable EPS and then heated. Therefore, this improves the thermal insulation effect and mechanical properties of the recycled plastic products containing marine PS floats.

[0028] As a preferred embodiment of the present invention, the flame retardant in S4 is a brominated flame retardant.

[0029] As a preferred embodiment of the present invention, the brominated flame retardant is selected from one or more of hexabromocyclododecane, tris(2,3-dibromopropyl)isocyanurate, and decabromodiphenyl ether.

[0030] As a preferred embodiment of the present invention, the bromine-based flame retardant is tris(2,3-dibromopropyl)isocyanurate.

[0031] The tri(2,3-dibromopropyl)isocyanurate was purchased from Dongguan Huashun Flame Retardant Materials Co., Ltd.

[0032] To improve the mixing uniformity of pulverized material with expandable EPS and flame retardants, and to obtain plastic products with stable mechanical properties and thermal conductivity, the inventors creatively discovered in experiments that by obtaining pulverized material with a particle size of less than 5mm, and after surface treatment with a surface treatment agent, particularly using sodium hexadecylbenzenesulfonate and Tween T-20 in a weight ratio of 1:(1-2) as a surface treatment agent to wet the surface of the pulverized material, and especially by stirring with a stirring device for 5-10 minutes at a speed of 100-200 r / min, the surface treatment agent can be thoroughly wetted onto the surface of the pulverized material, thus improving the mixing uniformity of the pulverized material with expandable EPS and flame retardants. This is likely because sodium hexadecylbenzenesulfonate has a benzene ring structure and an inorganic salt structure. Tween T-20 can improve the dispersibility of sodium hexadecylbenzenesulfonate in water, resulting in a uniformly dispersed treatment solution that can uniformly wet the surface of the pulverized material. However, using sodium hexadecylbenzenesulfonate alone can affect the mechanical properties of plastic products. The surface treatment of the pulverized material using the processing steps in this application takes 43-85 minutes. By surface treating the pulverized material with a surface treatment agent before mixing it with flame retardant and expandable EPS and then heating and extruding it, the processing time for pulverized material containing marine PS floats can be shortened, and the efficiency of preparing recycled plastic products containing marine PS floats can be improved. As a preferred technical solution of this invention, in step S2, after obtaining the pulverized material, a surface treatment agent is used to surface treat the pulverized material before heating and pressurizing.

[0033] Beneficial effects

[0034] 1. The preparation method provided by this invention can improve the efficiency of recycling marine PS floats.

[0035] 2. By using a surface treatment agent to treat the pulverized material according to the present invention, the uniformity of mixing the treated material b with expandable EPS and flame retardant can be improved, resulting in a plastic product with stable mechanical properties and thermal conductivity.

[0036] 3. By heating and pressurizing the material a according to the present invention, the heat preservation effect and mechanical properties of recycled plastic products containing marine PS floats are improved.

[0037] 4. The preparation method provided by this invention expands the recycling and processing methods of marine PS floats and can obtain high-performance plastic products. Detailed Implementation

[0038] Example 1

[0039] A method for preparing a marine PS buoy recycled plastic product includes the following steps:

[0040] S1. The recovered marine PS floats are cleaned, crushed, and impurities are removed to obtain crushed material;

[0041] S2. Surface-treat the pulverized material to obtain treated material a;

[0042] S3. Heat and pressurize the material a to obtain the material b;

[0043] S4. After mixing the treated material b, flame retardant, and expandable EPS, add the mixture to an extruder and heat and extrude it to obtain a recycled plastic product containing marine PS floats.

[0044] The particle size of the pulverized material in S1 is 3 mm.

[0045] The processing time for washing, crushing, and removing impurities from the recovered marine PS float in S1 is 50 minutes.

[0046] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0047] S4, by weight, contains 26 parts of treatment material b, 0.5 parts of flame retardant, and 74 parts of expandable EPS.

[0048] When the surface-treated material a is obtained by surface treatment with the surface treatment agent, the steps include: first, adding the surface treatment agent to water to obtain a treatment solution, wherein the mass concentration of the surfactant in the treatment solution is 5 wt%; second, adding the treatment solution to a stirring device, adding the pulverized material to the stirring device, and stirring for 8 minutes; the rotation speed of the stirring device is 150 r / min; the amount of pulverized material added is such that the surface of the pulverized material is wetted when the stirring device is turned on.

[0049] The surface treatment agent is a mixture of sodium hexadecylbenzenesulfonate and Tween T-20, wherein the weight ratio of sodium hexadecylbenzenesulfonate to Tween T-20 is 1:1.5.

[0050] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0051] In step S3, the material a is heated to a temperature of 90°C for a duration of 4 minutes.

[0052] In S3, the pressure for pressurizing the material a is 10 MPa, and the pressurization time is 8 min.

[0053] The bromine-based flame retardant is tris(2,3-dibromopropyl)isocyanurate.

[0054] The tri(2,3-dibromopropyl)isocyanurate was purchased from Dongguan Huashun Flame Retardant Materials Co., Ltd.

[0055] The manufacturer of the expandable EPS is Jianlong Machinery, and the model is EPS.

[0056] The sodium hexadecylbenzenesulfonate is a commercially available product.

[0057] The Tween T-20 is a commercially available product.

[0058] Example 2

[0059] A method for preparing a marine PS buoy recycled plastic product includes the following steps:

[0060] S1. The recovered marine PS floats are cleaned, crushed, and impurities are removed to obtain crushed material;

[0061] S2. Surface-treat the pulverized material to obtain treated material a;

[0062] S3. Heat and pressurize the material a to obtain the material b;

[0063] S4. After mixing the treated material b, flame retardant, and expandable EPS, add the mixture to an extruder and heat and extrude it to obtain a recycled plastic product containing marine PS floats.

[0064] The particle size of the pulverized material in S1 is 3 mm.

[0065] The processing time for washing, crushing, and removing impurities from the recovered marine PS float in S1 is 50 minutes.

[0066] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0067] The S4, by weight, contains 20 parts of treatment material b, 0.5 parts of flame retardant, and 80 parts of expandable EPS.

[0068] When the surface-treated material a is obtained by surface treatment with the surface treatment agent, the steps include: first, adding the surface treatment agent to water to obtain a treatment solution, wherein the mass concentration of the surfactant in the treatment solution is 8wt%; second, adding the treatment solution to a stirring device, adding the pulverized material to the stirring device, and stirring for 10 minutes; the rotation speed of the stirring device is 100r / min; the amount of pulverized material added is such that the surface of the pulverized material is wetted when the stirring device is turned on.

[0069] The surface treatment agent is a mixture of sodium hexadecylbenzenesulfonate and Tween T-20, wherein the weight ratio of sodium hexadecylbenzenesulfonate to Tween T-20 is 1:2.

[0070] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0071] In step S3, the material a is heated to a temperature of 90°C for a duration of 4 minutes.

[0072] In S3, the pressure for pressurizing the material a is 10 MPa, and the pressurization time is 8 min.

[0073] The bromine-based flame retardant is tris(2,3-dibromopropyl)isocyanurate.

[0074] The tri(2,3-dibromopropyl)isocyanurate was purchased from Dongguan Huashun Flame Retardant Materials Co., Ltd.

[0075] The manufacturer of the expandable EPS is Jianlong Machinery, and the model is EPS.

[0076] The sodium hexadecylbenzenesulfonate is a commercially available product.

[0077] The Tween T-20 is a commercially available product.

[0078] Example 3

[0079] A method for preparing a marine PS buoy recycled plastic product includes the following steps:

[0080] S1. The recovered marine PS floats are cleaned, crushed, and impurities are removed to obtain crushed material;

[0081] S2. Surface-treat the pulverized material to obtain treated material a;

[0082] S3. Heat and pressurize the material a to obtain the material b;

[0083] S4. After mixing the treated material b, flame retardant, and expandable EPS, add the mixture to an extruder and heat and extrude it to obtain a recycled plastic product containing marine PS floats.

[0084] The particle size of the pulverized material in S1 is 3 mm.

[0085] The processing time for washing, crushing, and removing impurities from the recovered marine PS float in S1 is 50 minutes.

[0086] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0087] The S4, by weight, contains 30 parts of treatment material b, 0.5 parts of flame retardant, and 70 parts of expandable EPS.

[0088] When the surface-treated material a is obtained by surface treatment with the surface treatment agent, the steps include: first, adding the surface treatment agent to water to obtain a treatment solution, wherein the mass concentration of the surfactant in the treatment solution is 3wt%; second, adding the treatment solution to a stirring device, adding the pulverized material to the stirring device, and stirring for 5 minutes; the rotation speed of the stirring device is 200 r / min; the amount of pulverized material added is such that the surface of the pulverized material is wetted when the stirring device is turned on.

[0089] The surface treatment agent is a mixture of sodium hexadecylbenzenesulfonate and Tween T-20, wherein the weight ratio of sodium hexadecylbenzenesulfonate to Tween T-20 is 1:2.

[0090] After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized.

[0091] In step S3, the material a is heated to a temperature of 90°C for a duration of 4 minutes.

[0092] In S3, the pressure for pressurizing the material a is 10 MPa, and the pressurization time is 8 min.

[0093] The bromine-based flame retardant is tris(2,3-dibromopropyl)isocyanurate.

[0094] The tri(2,3-dibromopropyl)isocyanurate was purchased from Dongguan Huashun Flame Retardant Materials Co., Ltd.

[0095] The manufacturer of the expandable EPS is Jianlong Machinery, and the model is EPS.

[0096] The sodium hexadecylbenzenesulfonate is a commercially available product.

[0097] The Tween T-20 is a commercially available product.

[0098] Example 4

[0099] Example 4 provides a method for preparing a recycled plastic product containing marine PS floats. The difference from Example 1 is that the surface treatment agent is not Tween T-20.

[0100] Example 5

[0101] Example 5 provides a method for preparing a recycled plastic product containing marine PS buoys. The difference from Example 1 is that the weight ratio of sodium hexadecylbenzenesulfonate and Tween T-20 is 1:0.5.

[0102] Performance testing

[0103] 1. Apparent density

[0104] The apparent density values ​​of the recycled plastic products containing marine PS floats obtained in Examples 1-5 were obtained by measuring the mass per unit volume under natural conditions. The test results are shown in Table 1.

[0105] 2. Thermal conductivity

[0106] The thermal conductivity of the recycled plastic products containing marine PS floats obtained in Examples 1-5 was tested using a thermal conductivity meter.

[0107] 3. Compressive strength

[0108] The recycled plastic products containing marine PS floats obtained in Examples 1-5 were tested for compressive strength according to GB / T8813-2008 "Determination of compressive properties of rigid foamed plastics". The test results are shown in Table 1.

[0109] 4. Flame retardant test

[0110] The recycled plastic products containing marine PS floats obtained in Examples 1-5 were tested for flame retardancy using GB / T17794-1999 "Classification Method for Combustion Performance of Building Materials". The test results showed that the recycled plastic products containing marine PS floats obtained in Examples 1-5 all met the standard of B1 grade flame-retardant materials.

[0111] Table 1

[0112]

Claims

1. A method for preparing a marine PS buoy recycled plastic product, characterized in that, Includes the following steps: S1. The recovered marine PS floats are cleaned, crushed, and impurities are removed to obtain crushed material; S2. Surface-treat the pulverized material to obtain treated material a; S3. Heat and pressurize the material a to obtain the material b; S4. After mixing the treated material b, flame retardant, and expandable EPS, add the mixture to an extruder and heat and extrude it to obtain a recycled plastic product containing marine PS floats. The particle size of the pulverized material in S1 is less than 5 mm; After the pulverized material is obtained in step S2, it is surface treated with a surface treatment agent and then heated and pressurized. The surface treatment agent is a mixture of sodium hexadecylbenzenesulfonate and Tween T-20, and the weight ratio of sodium hexadecylbenzenesulfonate to Tween T-20 is 1:(1-2). When surface-treating the pulverized material with a surface treatment agent to obtain treated material a, the steps include: first, adding the surface treatment agent to water to obtain a treatment solution, wherein the mass concentration of the surfactant in the treatment solution is 3-8 wt%; Next, add the treatment liquid to the stirring device, add the crushed material to the stirring device, and stir for 5-10 minutes; the speed of the stirring device is 100-200 r / min; the amount of crushed material added is such that the surface of the crushed material can be wetted when the stirring device is turned on. The heating temperature of the material a in S3 is 85-98℃; the pressure of the material a in S3 is 5-20MPa.

2. The method for preparing a marine PS buoy-containing recycled plastic product as described in claim 1, characterized in that, The flame retardant in S4 is a bromine-based flame retardant.

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