Granulation post-treatment method of ethyl cellulose
By using roller pressing and grading to process ethyl cellulose, the problem of dust in traditional processes has been solved, achieving high particle size and low cost in the production of ethyl cellulose, and improving the safety and performance of the product.
Patent Information
- Application Number
- CN202511531368.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-24
- Publication Date
- 2025-12-12
AI Technical Summary
Traditional ethyl cellulose preparation processes result in a fine powder product with a low apparent specific gravity, leading to dust generation during mixing, packaging, and use, which affects the working environment and operational safety.
Ethyl cellulose is prepared into flakes through rolling and coarse crushing steps, and then graded and granulated to control the particle size distribution, resulting in an ethyl cellulose product with a high particle size ratio.
It significantly reduces dust problems during the mixing, packaging and use of powdered ethyl cellulose, improves the false specific gravity and particle rate of the product, and ensures product purity and performance consistency.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of natural polymer material ethyl cellulose technology, and specifically to a method for post-processing ethyl cellulose granulation. Background Technology
[0002] The preparation of ethyl cellulose includes processes such as drying, pulverizing, mixing, and packaging. The resulting product is a fine powder with a low apparent specific gravity (0.1-0.3 g / mL) and a particle size range of 20-300 mesh (0.048-0.83 mm). The proportion of fine powder with a particle size >100 mesh (<0.15 mm) is >50%. This low apparent specific gravity and wide particle size distribution are the main reasons for dust problems during the mixing, packaging, and use of ethyl cellulose products. Traditional preparation processes cannot effectively solve the dust problem. Summary of the Invention
[0003] To address the aforementioned shortcomings in the existing technology, this invention provides a post-processing method for granulation of ethyl cellulose, which effectively solves the problem that ethyl cellulose produced by traditional processes is in the form of fine powder with a falsely low specific gravity, leading to dust pollution during mixing, packaging, and use, thus affecting the working environment and operational safety.
[0004] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: to provide a post-granulation treatment method for ethyl cellulose, characterized by comprising the following steps: S1. The pulverized ethyl cellulose is rolled and pressed into sheets; S2. The flakes obtained in step S1 are coarsely crushed, then graded, granulated, mixed, and packaged to obtain the ethyl cellulose product.
[0005] Furthermore, in step S1, the degree of substitution of ethyl cellulose is 44-52%, and the viscosity is 4-300 mPa·s.
[0006] Furthermore, in step S1, the water content of ethyl cellulose is 0.5-5%.
[0007] Furthermore, in step S1, the water content of ethyl cellulose is 0.5-3%.
[0008] Furthermore, in step S1, the pressure during pressing is 0.1-5 MPa.
[0009] Furthermore, in step S1, the pressure during pressing is 0.1-3 MPa.
[0010] Furthermore, in step S1, the sheet-like material has dimensions of 6-20 cm × 6-20 cm.
[0011] Furthermore, in step S1, the sheet-like material has dimensions of 6-12 cm × 6-12 cm.
[0012] Furthermore, in step S2, the dimensions of the crushed material are 1-8 cm × 1-8 cm.
[0013] Furthermore, in step S2, the size of the crushed material is 1-5 cm × 1-5 cm.
[0014] Furthermore, in step S2, during granulation, the particle size range is 2-100 mesh.
[0015] Furthermore, in step S2, during granulation, the particle size range is 20-80 mesh.
[0016] In summary, the present invention has the following beneficial effects: 1. The post-processing method provided by the present invention adds the steps of rolling, coarse crushing and grading and granulation to the existing ethyl cellulose production process. The parameters of each process are relaxed and the equipment requirements are not high, making it easy to implement industrially and produce on a large scale.
[0017] 2. In the post-processing method provided by the present invention, ethyl cellulose that has been dried and pulverized is directly used as raw material. The new process does not require the addition of any other chemical substances, thus ensuring the purity of the product.
[0018] 3. The post-processing method provided by the present invention can directly prepare powdered ethyl cellulose into granules with a particle rate of ≥75% and a maximum particle rate of 91%, which significantly improves the dust problem of traditional powder products.
[0019] 4. The preparation process provided by this invention is applicable to ethyl cellulose with different degrees of substitution and viscosities, covering products with high, medium and low degrees of substitution, as well as products with low, medium and high viscosity, and has a wide range of applications.
[0020] 5. This invention effectively improves the apparent specific gravity of the product, significantly reducing dust problems during mixing, packaging, and use. By controlling parameters such as material moisture content and pressure, it ensures consistent performance across different batches of product. In summary, the post-processing method provided by this invention has technical advantages such as simple process, low cost, strong adaptability, and significant effect, providing an effective solution for dust control in the ethyl cellulose industry. Detailed Implementation
[0021] The principles and features of this invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer should be followed. Reagents or instruments whose manufacturers are not specified are all commercially available products.
[0022] Example 1 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Highly substituted, high-viscosity ethyl cellulose (degree of substitution 50.8%, viscosity 300 mPa.s) that has been dried and pulverized, with a moisture content controlled at 3%, is rolled and pressed into sheets with a size of 10 cm × 10 cm under a pressure of 2.8 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 4 cm × 4 cm, then graded and granulated, controlling the particle size range to 20-80 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0023] Example 2 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Highly substituted low-viscosity ethyl cellulose (degree of substitution 52%, viscosity 4 mPa.s) that has been dried and pulverized, with its moisture content controlled at 2.4%, is rolled into sheets with a size of 12 cm × 12 cm under a pressure of 2.1 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 5 cm × 5 cm, then graded and granulated, controlling the particle size range to 20-80 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0024] Example 3 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Low-substituted medium-viscosity ethyl cellulose (degree of substitution 44.0%, viscosity 100 mPa.s) that has been dried and pulverized, with its moisture content controlled at 1.9%, is rolled into sheets with a size of 7 cm × 7 cm under a pressure of 0.6 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 1 cm × 1 cm, then graded and granulated, controlling the particle size range to 40-100 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0025] Example 4 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. The medium-substituted high-viscosity ethyl cellulose (degree of substitution 49.1%, viscosity 279 mPa.s) that has been dried and pulverized, with its moisture content controlled at 0.5%, is rolled into sheets with a size of 8 cm × 8 cm under a pressure of 1.5 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 2 cm × 2 cm, then graded and granulated, with the particle size range controlled at 30-90 mesh. The mixture is then mixed and packaged to obtain the ethyl cellulose product.
[0026] Example 5 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Low-substituted medium-viscosity ethyl cellulose (degree of substitution 47.4%, viscosity 110 mPa.s) that has been dried and pulverized, with its moisture content controlled at 0.1%, is rolled into sheets with a size of 6 cm × 6 cm under a pressure of 2.5 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 1.7 cm × 1.7 cm, then graded and granulated, controlling the particle size range to 20-80 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0027] Comparative Example 1 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Highly substituted low-viscosity ethyl cellulose (degree of substitution 52.1%, viscosity 4 mPa.s) that has been dried and pulverized, with its moisture content controlled at 3%, is rolled and pressed into sheets with a size of 20 cm × 20 cm under a pressure of 2.8 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 10 cm × 10 cm, then graded and granulated, controlling the particle size range to 2-60 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0028] Comparative Example 2 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. The dried and pulverized medium-substituted medium-viscosity ethyl cellulose (degree of substitution 47.8%, viscosity 150 mPa.s) with a moisture content of 4.6% was rolled under a pressure of 5.1 MPa to form sheets with a size of 17 cm × 17 cm. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 3 cm × 3 cm, then graded and granulated, controlling the particle size range to 8-70 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0029] Comparative Example 3 S1. The dried and pulverized low-substituted low-viscosity ethyl cellulose (substitution degree of 44.1%, viscosity of 10 mPa.s) is rolled at a pressure of 0.1 MPa to form sheets with a size of 25 cm × 25 cm. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 3.5 cm × 3.5 cm, then graded and granulated, controlling the particle size range to 20-80 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0030] Comparative Example 4 A method for post-granulation processing of ethyl cellulose includes the following steps: S1. Low-substituted medium-viscosity ethyl cellulose (degree of substitution 46.9%, viscosity 160 mPa.s) that has been dried and pulverized, with its moisture content controlled at 6.1%, is rolled into sheets with a size of 9 cm × 9 cm under a pressure of 4.4 MPa. S2. The flakes obtained in step S1 are coarsely crushed into small pieces of 6 cm × 6 cm, then graded and granulated, controlling the particle size range to 40-100 mesh, mixed and packaged to obtain the ethyl cellulose product.
[0031] Experimental Example 1 The particle size distribution of the raw materials in Examples 1-5 and Comparative Examples 1-4, as well as the particle size distribution of the obtained ethyl cellulose products, were tested, and the results are shown in Table 1.
[0032] Table 1 Comparison of Particle Size, Degree of Substitution, and Viscosity
[0033] As shown in Table 1, the present invention can directly prepare powdered ethyl cellulose into granules, increasing the particle size of ethyl cellulose products to 76-91%.
[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for post-granulation processing of ethyl cellulose, characterized in that, Includes the following steps: S1. The pulverized ethyl cellulose is rolled and pressed into sheets; S2. The flakes obtained in step S1 are coarsely crushed, then graded, granulated, mixed, and packaged to obtain the ethyl cellulose product.
2. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S1, the degree of substitution of the ethyl cellulose is 44-52%, and the viscosity is 4-300 mPa·s.
3. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S1, the water content of ethyl cellulose is 0.5-5%.
4. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S1, the pressure during pressing is 0.1-5 MPa.
5. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S1, the sheet material has dimensions of 6-20 cm × 6-20 cm.
6. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S2, the material after coarse crushing has a size of 1-8 cm × 1-8 cm.
7. The post-granulation treatment method for ethyl cellulose as described in claim 1, characterized in that, In step S2, the particles are graded and granulated, with the particle size range controlled to 2-100 mesh.