阅读说明：本技术 用于回收溶解发泡聚苯乙烯的溶剂及回收溶解方法 (Solvent for recovering and dissolving expanded polystyrene and recovering and dissolving method ) 是由 高庆武 高寒 于 2019-10-21 设计创作，主要内容包括：用于回收溶解发泡聚苯乙烯的溶剂及回收溶解方法,所述用于回收溶解发泡聚苯乙烯的溶剂包括高级混合脂肪酸脂类,柠檬酸脂类,以及助溶剂,其中所述高级混合脂肪酸脂类为碳原子数为16至18的脂肪酸合成的甲脂、乙脂、和丁脂中的两种或三种的混合物,且该高级混合脂肪酸脂类的重量占总重量的50％至70％,所述助溶剂类为碳原子数为6、8、12的醇类中的一种或几种的混合物,所述助溶剂的重量占总重量的20％至30％,其余为柠檬酸脂类。本溶剂完全是环保材料。当将所述发泡聚苯乙烯(EPS)投入该溶剂中时,发泡聚苯乙烯(EPS)会完全溶解在该溶剂中,完全是物理变化,而不会发生化学变化,因此不会产生任何有害物质也不会影响回收得到的聚苯乙烯(PS)的本来的性能,因此还可以回收再利用。(The solvent for recovering and dissolving the foamed polystyrene comprises higher mixed fatty acid esters, citric acid esters and a cosolvent, wherein the higher mixed fatty acid esters are a mixture of two or three of methyl ester, ethyl ester and butyl ester synthesized by fatty acid with 16 to 18 carbon atoms, the weight of the higher mixed fatty acid esters accounts for 50 to 70 percent of the total weight, the cosolvent is a mixture of one or more of alcohols with 6, 8 and 12 carbon atoms, the weight of the cosolvent accounts for 20 to 30 percent of the total weight, and the balance is the citric acid esters. The solvent is completely an environment-friendly material. When the Expanded Polystyrene (EPS) is put into the solvent, the Expanded Polystyrene (EPS) is completely dissolved in the solvent, is completely physically changed, and does not chemically change, and therefore, any harmful substance is not generated and the original performance of the recycled Polystyrene (PS) is not affected, and therefore, recycling and reuse are also possible.)

1. A solvent for recovering and dissolving expanded polystyrene is characterized in that: the solvent for dissolving the foaming polystyrene comprises higher mixed fatty acid lipids, citric acid lipids and a cosolvent, wherein the higher mixed fatty acid lipids are a mixture of two or three of methyl ester, ethyl ester and butyl ester synthesized by mixed fatty acid with the carbon atom number of 16-18, the weight of the higher mixed fatty acid lipids accounts for 50-70% of the total weight, the cosolvent is a mixture of one or more of alcohols with the carbon atom numbers of 6, 8 and 12, the weight of the cosolvent accounts for 20-30% of the total weight, and the balance is the citric acid lipids.

2. The solvent for dissolving expanded polystyrene as set forth in claim 1, wherein: the weight of the higher mixed fatty acid lipid accounts for 55-60% of the total weight.

3. The solvent for dissolving expanded polystyrene as set forth in claim 1, wherein: the weight of the higher mixed fatty acid lipid accounts for 58% of the total weight.

4. The solvent for dissolving expanded polystyrene as set forth in claim 1, wherein: the weight of the cosolvent accounts for 22-27% of the total weight.

5. The cosolvent for dissolving expanded polystyrene of claim 1, wherein: the co-solvent is important in 24% of the total weight.

6. The solvent for dissolving expanded polystyrene as set forth in claim 1, wherein: the citrate is one or a mixture of triethyl citrate, tributyl citrate and acetyl tributyl citrate.

7. The method for recovering and dissolving the expanded polystyrene comprises the following steps:

Step S1, providing Expanded Polystyrene (EPS) with a certain weight;

A step S2 of providing a certain weight of the solvent for dissolving Expanded Polystyrene (EPS) according to any one of claims 1 to 6, the container for containing the solvent for dissolving Expanded Polystyrene (EPS) being made of non-expanded polystyrene;

Step S3, the Expanded Polystyrene (EPS) is put into the solvent for dissolving the Expanded Polystyrene (EPS) at a speed such that the Expanded Polystyrene (EPS) does not accumulate on the solvent until a little amount of the Expanded Polystyrene (EPS) remains on the surface of the solvent.

8. The method for recycling and dissolving expanded polystyrene as claimed in claim 7, wherein: in step S1, the Expanded Polystyrene (EPS) is placed in a separate collection box.

9. The method for recycling and dissolving expanded polystyrene as claimed in claim 7, wherein: before step S3, the Expanded Polystyrene (EPS) may be chopped.

10. the method for recycling and dissolving expanded polystyrene as claimed in claim 7, wherein: after the step S4, a step S4 is further included, in which step S4, the dissolved mixture is filtered through a filter to remove impurities, and Polystyrene (PS) gel with a solid content of 30-33% is recovered.

Technical Field

The invention relates to the technical field of green environmental protection, white pollution solving, recycling and reusing, in particular to a solvent for recycling and dissolving expanded polystyrene and a recycling and dissolving method.

background

The expanded polystyrene is also called expanded polystyrene foam, EPS for short, is composed of polystyrene, a flame retardant and a foaming agent, is a common material with wide application, is mainly used in the fields of packaging, heat preservation and the like, and is particularly widely applied to the packaging of household appliances, instruments, artware and other easily damaged and valuable products and the packaging of fast food which is rapidly developed in recent years. However, the product is disposable, and if the product is discarded after use, the product causes environmental pollution, and is typical 'white waste', so that the effective treatment of the Expanded Polystyrene (EPS) waste becomes particularly important. At present, a landfill method is used in many places, but Expanded Polystyrene (EPS) does not decay or degrade in water or soil for many years. If the materials are piled up in a centralized way, the materials are foamed, so that the occupied area is large, and the materials are not favorable for fire prevention. If it is burned as a waste, it produces a very harsh black smoke and releases a large amount of dioxin, which further poses serious harm to the environment.

Therefore, the effective and reasonable recycling method, technology and subsequent utilization of the Expanded Polystyrene (EPS) can improve the recycling value of the Expanded Polystyrene (EPS) and protect the environment.

disclosure of Invention

in view of the above, the present invention provides a solvent for recovering and dissolving expanded polystyrene and a method for recovering and dissolving expanded polystyrene, which can effectively dissolve the expanded polystyrene, and the obtained polystyrene gel (PS) can be further used for modification of engineering plastics to recycle and change waste into valuable, so as to solve the above problems.

The solvent for recovering and dissolving the foaming polystyrene comprises higher mixed fatty acid esters, citric acid esters and a cosolvent, wherein the higher mixed fatty acid esters are a mixture of two or three of methyl ester, ethyl ester and butyl ester synthesized by mixed fatty acids with 16 to 18 carbon atoms, the weight of the higher mixed fatty acid esters accounts for 50 to 70 percent of the total weight, the cosolvent is a mixture of one or more of alcohols with 6, 8 and 12 carbon atoms, the weight of the cosolvent accounts for 20 to 30 percent of the total weight, and the balance is the citric acid esters.

Further, the weight of the higher mixed fatty acid lipids is 55% to 60% of the total weight.

Further, the weight of the higher mixed fatty acid lipids accounted for 58% of the total weight.

Further, the weight of the cosolvent accounts for 22-27% of the total weight.

Further, the weight of the cosolvent accounts for 24 percent of the total weight.

Further, the citrate lipid is one or a mixture of triethyl citrate, tributyl citrate and acetyl tributyl citrate.

the method for recovering and dissolving the expanded polystyrene comprises the following steps:

Step S1, providing Expanded Polystyrene (EPS) with a certain weight;

Step S2, providing a certain weight of the solvent for dissolving Expanded Polystyrene (EPS) as described above, the container for holding the solvent for dissolving Expanded Polystyrene (EPS) being made of non-expanded polystyrene;

Step S3, the Expanded Polystyrene (EPS) is put into the solvent for dissolving the Expanded Polystyrene (EPS) at a speed such that the Expanded Polystyrene (EPS) does not accumulate on the solvent until a little amount of the Expanded Polystyrene (EPS) remains on the surface of the solvent.

Further, in step S1, the Expanded Polystyrene (EPS) is placed in a separate collection box.

Further, the Expanded Polystyrene (EPS) may be chopped prior to step S3.

Further, after step S4, step S4 is included, in which step S4 the dissolved mixture is filtered through a filter to remove impurities therefrom, and Polystyrene (PS) gel is recovered.

Compared with the prior art, the solvent for recovering and dissolving the expanded polystyrene provided by the invention uses the higher mixed fatty acid ester, and the carbon atom number of the higher mixed fatty acid ester is between 16 and 18, so that the higher mixed fatty acid ester is derived from animals and plants, the citric acid ester is a food-grade material, and the alcohols with the carbon atom numbers of 6, 8 and 12 are nontoxic and harmless, so that the solvent is completely an environment-friendly material, and the solvent is colorless and odorless, is nonflammable, is insoluble in water and can be transported at will. Through the mixing preparation of the above materials, when the Expanded Polystyrene (EPS) is put into the solvent, the Expanded Polystyrene (EPS) is completely dissolved in the solvent, as white sugar is dissolved in water, and is completely physically changed without chemical change, thereby not generating any harmful substance. When the Expanded Polystyrene (EPS) is put into the solvent, the Expanded Polystyrene (EPS) releases gas and is converted into a gel material with the density of the unexpanded original Polystyrene (PS), the volume of the Expanded Polystyrene (EPS) can be reduced to be 25-60 times of the original expanded volume, the original performance of the EPS can not be influenced while the transportation cost is greatly saved, and the Expanded Polystyrene (EPS) can be recycled, such as being modified to be made into various engineering plastics.

Detailed Description

Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

The solvent for recovering and dissolving expanded polystyrene provided by the invention comprises higher mixed fatty acid esters, citric acid esters and a cosolvent. The higher mixed fatty acid ester is a mixed fatty acid ester of two or three of methyl ester, ethyl ester and butyl ester of mixed fatty acid with 16 to 18 carbon atoms. The fatty acid having 16 to 18 carbon atoms may be a saturated hydrocarbon group or an unsaturated hydrocarbon group of C16 or C18. The methyl ester, the ethyl ester and the butyl ester are respectively mixed fatty acid methyl ester R-COOCH3, mixed fatty acid ethyl ester R-COOC2H6 and mixed fatty acid butyl ester R-COOC4H12, wherein R is C16 or C18 saturated alkyl or unsaturated alkyl. In practice, the higher mixed fatty acid lipids may be extracted from plants or animals. In actual industrial use, the mixed fatty acid with 16 to 18 carbon atoms can be directly used and obtained from illegal cooking oil, so that the environmental protection index can be further improved, waste materials are further changed into valuable materials, and waste materials are utilized. The weight of the higher mixed fatty acid lipid accounts for 50-70% of the total weight, preferably, the weight of the higher mixed fatty acid lipid accounts for 55-60% of the total weight. In this example, the higher mixed fatty acid lipids were present in an amount of 58% by weight of the total weight.

The triethyl citrate has the molecular formula of C12H20O7, is mainly used as a plasticizer of an adhesive and a sealant, has strong dissolving capacity, has good compatibility with a plurality of resins, and has good oil resistance, light resistance and mildew resistance, the tributyl citrate has the chemical name of 3-hydroxy-3-carboxyl tributyl glutarate, is an ester compound, is a colorless transparent high-boiling-point liquid, is slightly soluble in water, is soluble in most organic solvents, and is formed by the reaction of citric acid and n-butyl alcohol in the industry, the tributyl acetylcitrate has the chemical formula of C ₂₀ H ₃₄ O ₈, is a colorless odorless oily liquid, is soluble in most organic solvents, and the weight percentage content of the citrate can be set according to the content of the higher mixed fatty acid esters, namely when the weight percentage content of the higher mixed fatty acid esters and the cosolvent is determined, the weight percentage content of the citrate is 18% of the cosolvent.

The cosolvent is one or a mixture of more of alcohols with 6, 8 and 12 carbon atoms, and accounts for 20-30% of the total weight. Preferably, the weight of the cosolvent is 22% to 27% of the total weight. In this example, the co-solvent is present in an amount of 24% by weight of the total weight. The alcohols having 6, 8, 12 carbon atoms may be pentanol, neopentyl alcohol, heptanol or n-heptanol, 3-heptanol, and the like.

The solvent for dissolving the Expanded Polystyrene (EPS) can be prepared by mixing the high-grade mixed fatty acid ester, the citric acid ester and the cosolvent according to comparison, is colorless and tasteless slightly viscous liquid and is used as a natural solvent, the high-grade mixed fatty acid ester is safe, can not explode and is non-toxic, and the flame retardant is added according to the requirement, so that the flame retardant effect is achieved. When the Polystyrene (PS) is used, the Expanded Polystyrene (EPS) can be dissolved in the solvent for dissolving the Expanded Polystyrene (EPS) only by putting the Expanded Polystyrene (EPS) into the solvent without heating, so that the physical property of the recycled Polystyrene (PS) is hardly reduced in the dissolving process, and the volume of the Expanded Polystyrene (EPS) is reduced to be 25-60 times of the volume of the original Expanded Polystyrene (EPS), so that the volume of the polystyrene (EPS) can be greatly reduced, and the transportation cost is greatly reduced. Meanwhile, the physical properties of the Polystyrene (PS) obtained from the dissolved Expanded Polystyrene (EPS) are not reduced, and the citric acid esters are plasticizer components necessary for plastic processing, so that the modified engineering plastic can be obtained by blending and modifying the Polystyrene (PS) gel obtained after dissolution, the engineering plastics such as PE, PP, PVC, PS, ABS and the like and related processing aids, and the Polystyrene (PS) obtained after dissolution can be recycled.

Compared with the prior art, the solvent for dissolving Expanded Polystyrene (EPS) provided by the invention can be derived from animals and plants due to the use of the higher mixed fatty acid esters, and the carbon atoms of the higher mixed fatty acid esters are between 16 and 18, while the citric acid esters are food-grade materials, and the alcohols with the carbon atoms of 6, 8 and 12 are nontoxic and harmless, so that the solvent is completely an environment-friendly material, and is colorless, odorless, nonflammable, insoluble in water and transportable. Through the mixing preparation of the above materials, when the Expanded Polystyrene (EPS) is put into the solvent, the Expanded Polystyrene (EPS) is completely dissolved in the solvent, as white sugar is dissolved in water, and is completely physically changed without chemical change, thereby not generating any harmful substance. When the Expanded Polystyrene (EPS) is put into the solvent, the Expanded Polystyrene (EPS) releases gas and is converted into a gel material with the density of the unexpanded original Polystyrene (PS), the volume of the Expanded Polystyrene (EPS) can be reduced to 25 to 60 times of the original expanded volume, the transportation cost is greatly saved, and the original performance of the recycled Polystyrene (PS) can not be influenced, so that the Expanded Polystyrene (EPS) can be recycled and reused, for example, the Expanded Polystyrene (EPS) can be modified to prepare various modified engineering plastics.

the invention also provides a method for recovering and dissolving the expanded polystyrene, which comprises the following steps:

Step S1, providing Expanded Polystyrene (EPS) with a certain weight;

Step S2, providing a certain weight of the solvent for recovering the dissolved Expanded Polystyrene (EPS) as described above, the container for containing the solvent for dissolving the Expanded Polystyrene (EPS) being made of non-expanded polystyrene;

A step S3 of pouring the Expanded Polystyrene (EPS) into the solvent for dissolving the Expanded Polystyrene (EPS) at a speed such that the Expanded Polystyrene (EPS) does not accumulate on the solvent until a little amount of the Expanded Polystyrene (EPS) remains on the surface of the solvent;

Step S4: filtering out impurities from the dissolved mixture by a filter, and recovering to obtain Polystyrene (PS) gel with the solid content of 30-33%.

In step S1, the Expanded Polystyrene (EPS) may be placed in a separate collection box to avoid mixing with other materials and resulting in contamination of the dissolved Expanded Polystyrene (EPS).

Before step S3, the Expanded Polystyrene (EPS) may be chopped to accelerate the dissolution of the Expanded Polystyrene (EPS).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.