CN112693036A - Pretreatment method of glass fiber reinforced plastic leftover material - Google Patents
Pretreatment method of glass fiber reinforced plastic leftover material Download PDFInfo
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- CN112693036A CN112693036A CN202011442709.9A CN202011442709A CN112693036A CN 112693036 A CN112693036 A CN 112693036A CN 202011442709 A CN202011442709 A CN 202011442709A CN 112693036 A CN112693036 A CN 112693036A
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- glass fiber
- reinforced plastic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a pretreatment method of a glass fiber reinforced plastic leftover material, and relates to the technical field of solid waste treatment. Crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber; screening the crushed material to obtain screened material; the aperture of the sieve for sieving is 0.15 mm; mixing the sieved material with water to obtain slurry; and aerating and stirring the slurry for flotation, wherein the obtained foam layer is a glass fiber enriched product, and the underflow layer is an unsaturated polyester resin enriched product. The invention adopts simple crushing, screening and flotation separation to primarily separate and enrich the glass fiber and resin in the glass fiber reinforced plastic waste, thereby realizing the recovery of glass fiber reinforced plastic waste resources, and the separated and enriched glass fiber and resin can be used as raw materials for remanufacturing glass fiber reinforced plastic; the pretreatment method provided by the invention is simple in process and easy to operate.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a pretreatment method of a glass fiber reinforced plastic leftover material.
Background
Glass fiber reinforced plastics, i.e., fiber reinforced plastics, generally refer to reinforced plastics in which an unsaturated polyester matrix is reinforced with glass fibers. Glass fiber reinforced plastic products are widely used due to the advantages of low density, high strength, corrosion resistance and the like, but the glass fiber reinforced plastic products are not easy to decompose, differentiate and recycle, and the stacking, treatment and recycling of the waste glass fiber reinforced plastic products are more and more concerned with the increase of the yield. The glass fiber reinforced plastic corner waste materials produced in China each year account for 5% of the total output, the economic loss caused by the glass fiber reinforced plastic corner waste materials is nearly 6000 ten thousand yuan, the waste glass fiber reinforced plastic products are basically not treated, and most of the waste glass fiber reinforced plastic products are buried in the spot or burnt in the natural environment, so that the environment is greatly polluted. The recovery of waste glass fiber reinforced plastic resources is a problem to be solved urgently in the forward development of the glass fiber reinforced plastic industry.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for pretreating glass fiber reinforced plastic leftover materials. The invention adopts simple crushing, screening and flotation separation to primarily separate and enrich the glass fiber and resin in the glass fiber reinforced plastic waste, thereby realizing the recovery of the glass fiber reinforced plastic waste resource.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a pretreatment method of a glass fiber reinforced plastic leftover material, which comprises the following steps:
(1) crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber;
(2) screening the crushed material to obtain screened material; the aperture of the sieve for sieving is 0.15 mm;
(3) mixing the sieved material with water to obtain slurry; and aerating and stirring the slurry for flotation to obtain a foam layer and a bottom flow layer, wherein the foam layer is a glass fiber enriched product, and the bottom flow layer is an unsaturated polyester resin enriched product.
Preferably, the crushing time in the step (1) is 50-70 s.
Preferably, oversize materials are obtained through screening in the step (2), and the oversize materials are returned to the step (1) to be continuously crushed after screening.
Preferably, the solid content of the slurry in the step (3) is 28-35 wt%.
Preferably, the stirring speed in the step (3) is 1760-1920 r/min.
Preferably, after the step (3) of floating, the method further comprises filtering and drying the obtained froth layer and underflow layer respectively.
The invention provides a pretreatment method of a glass fiber reinforced plastic leftover material, which comprises the following steps: (1) crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber; (2) screening the crushed material to obtain screened material; the aperture of the sieve for sieving is 0.15 mm; (3) mixing the sieved material with water to obtain slurry; and aerating and stirring the slurry for flotation to obtain a foam layer and a bottom flow layer, wherein the foam layer is a glass fiber enriched product, and the bottom flow layer is an unsaturated polyester resin enriched product. The invention crushes the glass fiber reinforced plastic leftover materials, separates the glass fiber from the resin, and carries out flotation and sorting by utilizing the floatability difference of the glass fiber and the unsaturated polyester resin after screening to respectively obtain a glass fiber enriched product and an unsaturated polyester resin enriched product. The invention adopts simple crushing, screening and flotation separation to primarily separate and enrich the glass fiber and resin in the glass fiber reinforced plastic waste, thereby realizing the recovery of glass fiber reinforced plastic waste resources, and the separated and enriched glass fiber and resin can be used as raw materials for remanufacturing glass fiber reinforced plastic; the pretreatment method provided by the invention is simple in process and easy to operate.
Drawings
FIG. 1 is a scanning electron micrograph of the screen material of example 1;
FIG. 2 is a scanning electron micrograph of the glass fiber concentrate of example 1;
FIG. 3 is a scanning electron micrograph of the unsaturated polyester resin concentrate of example 1.
Detailed Description
The invention provides a pretreatment method of a glass fiber reinforced plastic leftover material, which comprises the following steps:
(1) crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber;
(2) screening the crushed material to obtain screened material; the aperture of the sieve for sieving is 0.15 mm;
(3) mixing the sieved material with water to obtain slurry; and aerating and stirring the slurry for flotation to obtain a foam layer and a bottom flow layer, wherein the foam layer is a glass fiber enriched product, and the bottom flow layer is an unsaturated polyester resin enriched product.
Crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber. The invention does not require any particular source of such glass fibre reinforced plastic scrap, and glass fibre reinforced plastic scrap of a source well known to those skilled in the art is suitable for use in the present invention. In the present invention, the pulverization is preferably carried out in a small-sized pulverizer; the crushing time is preferably 50-70 s, and more preferably 60 s; and separating the glass fiber from the resin in the glass fiber reinforced plastic leftover material through crushing.
After the crushed material is obtained, screening the crushed material to obtain screened material; the aperture of the sieve is 0.15 mm. In the invention, the oversize material is obtained by screening, and after screening, the oversize material is preferably returned to the step for continuous crushing. According to the invention, large particles of glass fiber still combined with resin in the crushing process are screened out through the screening, so that the material entering the flotation process has enough separation degree.
After the screened material is obtained, mixing the screened material with water to obtain slurry; and aerating and stirring the slurry for flotation to obtain a foam layer and a bottom flow layer, wherein the foam layer is a glass fiber enriched product, and the bottom flow layer is an unsaturated polyester resin enriched product. In the invention, the solid content of the slurry is preferably 28-35 wt%, and more preferably 30 wt%; the method of mixing is not particularly required in the present invention, and the screen material is sufficiently dispersed in water by a mixing method well known to those skilled in the art, specifically, by stirring and mixing. The invention has no special requirements on the specific operation of the aeration, and a flotation aeration method well known to the technical personnel in the field can be adopted; the invention has no special requirement on the aeration quantity of the aeration, and can ensure that the flotation is fully carried out. In the invention, the stirring speed is preferably 1760-1920 r/min, and more preferably 1800 r/min. In the present invention, the flotation is preferably carried out in a flotation cell, which is not particularly required by the present invention, but which may be a flotation cell known to the person skilled in the art. The flotation is performed by using the difference of floatability of the substances, namely, the difference between hydrophilicity and hydrophobicity of the substances, and the glass fiber has stronger hydrophobicity compared with the unsaturated polyester resin, so that the glass fiber can be floated. In the invention, after the flotation, the froth layer is scraped and separated from the underflow layer. In the invention, after the flotation, the obtained foam layer and the obtained underflow layer are preferably filtered and dried respectively, so as to obtain a glass fiber enriched product and an unsaturated polyester resin enriched product respectively. The method for filtering is not particularly required by the invention, and the filtering method well known to the technicians in the field can be adopted; the invention has no special requirements on the drying temperature and time, and can dry the product to constant weight.
The invention adopts simple crushing, screening and flotation separation to primarily separate and enrich the glass fiber and resin in the glass fiber reinforced plastic waste, thereby realizing the recovery of glass fiber reinforced plastic waste resources, and the separated and enriched glass fiber and resin can be used as raw materials for remanufacturing glass fiber reinforced plastic; the pretreatment method provided by the invention is simple in process and easy to operate.
The method for pretreating the glass fiber reinforced plastic scrap according to the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Pretreating the glass fiber reinforced plastic leftover material (glass fiber reinforced unsaturated polyester resin) by the following steps:
(1) crushing 1000g of glass fiber reinforced plastic leftover materials in a small crusher for 1 min;
(2) screening the crushed glass fiber reinforced plastic leftover materials by using a screen with the aperture of 0.15mm to obtain 780g of screen blanking materials and 220g of screen feeding materials; returning the oversize material to the step (1) for continuous crushing; the scanning electron microscope image of the screened material is shown in fig. 1, and as can be seen from fig. 1, after being crushed, the resin is basically separated from the glass fiber;
(3) adding water into 200g of sieve material, and stirring and mixing to obtain slurry with the solid content of 30 wt%; placing the slurry into a 500mL flotation tank, stirring and aerating for flotation, wherein the stirring speed is 1800r/min, and obtaining a foam layer product and a bottom flow product; scraping out the foam layer product, sequentially filtering and drying to obtain glass fiber enrichment, and sequentially filtering and drying the underflow product to obtain unsaturated polyester resin enrichment.
FIG. 2 is a scanning electron micrograph of the obtained glass fiber concentrate, and FIG. 3 is a scanning electron micrograph of the obtained unsaturated polyester resin concentrate. As can be seen from FIGS. 2 and 3, the separation and enrichment of the glass fiber and resin in the glass fiber reinforced plastic leftover material are realized through flotation separation. The yield of the glass fiber-enriched material was 38.56%, and the yield of the unsaturated polyester resin-enriched material was 61.44% (note: the yield of the glass fiber-enriched material ═ the amount of the glass fiber-enriched material/(the amount of the glass fiber-enriched material + the amount of the unsaturated polyester resin-enriched material)).
Example 2
Pretreating the glass fiber reinforced plastic leftover material (glass fiber reinforced unsaturated polyester resin) by the following steps:
(1) crushing 1000g of glass fiber reinforced plastic leftover materials in a small crusher for 1 min;
(2) screening the crushed glass fiber reinforced plastic leftover materials by using a screen with the aperture of 0.15mm to obtain 780g of screen blanking materials and 220g of screen feeding materials; returning the oversize material to the step (1) for continuous crushing;
(3) adding water into 250g of sieve material, and stirring and mixing to obtain slurry with the solid content of 35 wt%; placing the slurry into a 500mL flotation tank, stirring and aerating for flotation, wherein the stirring speed is 1800r/min, and obtaining a foam layer product and a bottom flow product; scraping out the foam layer product, sequentially filtering and drying to obtain glass fiber enrichment, and sequentially filtering and drying the underflow product to obtain unsaturated polyester resin enrichment. The yield of the glass fiber concentrate was 37.89%, and the yield of the unsaturated polyester resin concentrate was 62.11%.
It can be seen from the above examples that the invention adopts simple crushing, screening and flotation separation, so as to primarily separate and enrich the glass fiber and resin in the glass fiber reinforced plastic waste, thereby realizing the recovery of the glass fiber reinforced plastic waste resource.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The pretreatment method of the glass fiber reinforced plastic leftover material is characterized by comprising the following steps:
(1) crushing the glass fiber reinforced plastic leftover material to obtain crushed material; the components of the glass fiber reinforced plastic leftover material comprise unsaturated polyester resin and glass fiber;
(2) screening the crushed material to obtain screened material; the aperture of the sieve for sieving is 0.15 mm;
(3) mixing the sieved material with water to obtain slurry; and aerating and stirring the slurry for flotation to obtain a foam layer and a bottom flow layer, wherein the foam layer is a glass fiber enriched product, and the bottom flow layer is an unsaturated polyester resin enriched product.
2. The pretreatment method according to claim 1, wherein the pulverization time in the step (1) is 50 to 70 seconds.
3. The pretreatment method according to claim 1 or 2, wherein the step (2) of screening also obtains oversize material, and the step of screening also comprises returning the oversize material to the step (1) to continue crushing.
4. The pretreatment method according to claim 1, wherein the slurry in the step (3) has a solid content of 28 to 35 wt%.
5. The pretreatment method according to claim 1, wherein the stirring speed in the step (3) is 1760 to 1920 r/min.
6. The pretreatment method according to claim 1, 4 or 5, wherein after the step (3) of floating, the step of filtering and drying the obtained froth layer and underflow layer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011442709.9A CN112693036A (en) | 2020-12-08 | 2020-12-08 | Pretreatment method of glass fiber reinforced plastic leftover material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011442709.9A CN112693036A (en) | 2020-12-08 | 2020-12-08 | Pretreatment method of glass fiber reinforced plastic leftover material |
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| Publication Number | Publication Date |
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| CN112693036A true CN112693036A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011442709.9A Withdrawn CN112693036A (en) | 2020-12-08 | 2020-12-08 | Pretreatment method of glass fiber reinforced plastic leftover material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115556271A (en) * | 2022-11-14 | 2023-01-03 | 国能龙源环保有限公司 | Method for separating and enriching resin in waste wind power blade |
| WO2024103672A1 (en) * | 2022-11-14 | 2024-05-23 | 国能龙源环保有限公司 | Method for enriching glass fibers in waste wind turbine blades |
-
2020
- 2020-12-08 CN CN202011442709.9A patent/CN112693036A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115556271A (en) * | 2022-11-14 | 2023-01-03 | 国能龙源环保有限公司 | Method for separating and enriching resin in waste wind power blade |
| WO2024103672A1 (en) * | 2022-11-14 | 2024-05-23 | 国能龙源环保有限公司 | Method for enriching glass fibers in waste wind turbine blades |
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Application publication date: 20210423 |