Preparation method of chemical solvent resistant masterbatch for chemical barrels and masterbatch thereof

Abstract

The present invention discloses a method for preparing a chemical solvent resistant masterbatch for chemical barrels and a masterbatch thereof, wherein the method for preparing a chemical solvent resistant masterbatch for chemical barrels comprises preparing a semi-finished colorant, preparing a second mixed material, preparing a second mixed material, and preparing a finished masterbatch. This scheme not only avoids the degradation of the performance of the material due to excessively high temperature during processing through a segmented processing technology, but also multiple mixing can help to evenly distribute the materials. At the same time, a three-roll grinder is used to grind the semi-finished colorant to reduce the particle size of the powder of the semi-finished colorant, thereby ensuring the mixing effect of the second mixing and further improving the uniformity of the distribution of the materials.

Description

Technical Field

[0001] The invention relates to the field of chemical industry, in particular to a method for preparing a chemical solvent resistant masterbatch for chemical barrels and the masterbatch. Background Art

[0002] Chemical engineering is the abbreviation of "chemical technology", "chemical industry", "chemical engineering", etc. Any technology that uses chemical methods to change the composition and structure of substances or synthesize new substances belongs to chemical production technology, that is, chemical technology. The resulting products are called chemicals or chemical products. Chemical products are usually stored in chemical barrels to avoid leakage.

[0003] Chemical barrels are mostly made of plastic, generally called plastic chemical barrels and plastic chemical barrels. Plastic chemical barrels are made of polyethylene, polypropylene, polyester and other plastics through blow molding, injection molding, vacuum forming, rotational molding and other processes. They are mostly used in chemical, pharmaceutical, food, hardware electronics, electromechanical and other industries to hold liquids and solids. They are currently the ideal choice for long-distance transportation of chemical product packaging materials. They can replace stainless steel, titanium and other metal product containers to a considerable extent. They are the most ideal corrosion-resistant storage and transportation equipment for chemical liquids today, and they are inexpensive and good quality. The products are widely used in chemical, dye, pharmaceutical, pesticide, metallurgy, rare earth, machinery, electronics, environmental protection, textile, food and other industries. Since chemical barrels generally use dark colors such as blue and black, in order to prevent discoloration during use, it is necessary to design a chemical barrel special color masterbatch with excellent resistance to chemical solvents. However, in the processing of masterbatch, there are still problems such as uneven distribution of materials and excessive temperature during processing that affect the performance of masterbatch. Summary of the invention

[0004] Therefore, in order to solve the above problems and realize the chemical solvent corrosion resistance and stability of masterbatch for chemical barrels, the present invention provides a method for preparing chemical solvent resistant masterbatch for chemical barrels and the masterbatch.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for preparing a chemical solvent-resistant masterbatch for chemical barrels, characterized in that it comprises the following steps:

[0007] A: Preparation of semi-finished pigments:

[0008] a1: Proportion: Proportion the materials according to the following weight parts: 30-40 parts of polyethylene resin, 4-5 parts of dispersant, 10-15 parts of reinforcing agent, 45-50 parts of pigment powder;

[0009] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use;

[0010] a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind for 3 minutes to 5 minutes to prepare a semi-finished colorant;

[0011] B: preparing a second mixed material;

[0012] b1: Proportion: Proportion the materials according to the following weight parts: 70-80 weight parts of semi-finished colorant, 10-20 weight parts of polyethylene resin, 1-2 weight parts of stabilizer, 1-2 weight parts of dispersant, 4-6 weight parts of reinforcing agent;

[0013] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115° C. to 125° C. for 20 min to 25 min to prepare a second mixed material and cool it to room temperature);

[0014] C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation, and the temperature in the twin-screw extruder is controlled at 110° C. to 130° C. to prepare finished masterbatch. Preferably,.

[0015] Preferably, in step a3, the particle size of the semi-finished pigment after grinding is ≤3 mm.

[0016] Preferably, the polyethylene resin is a low-density polyethylene resin.

[0017] Preferably, the dispersant is polyethylene wax.

[0018] Preferably, the stabilizer is zinc stearate.

[0019] Preferably, the reinforcing agent is ultrafine calcium carbonate and / or active ultrafine calcium carbonate, which has excellent wettability and reinforcing properties on rubber.

[0020] Preferably, the average particle size of the ultrafine calcium carbonate is 0.02 μm to 0.1 μm.

[0021] Preferably, the pigment toner is an organic phthalocyanine pigment.

[0022] Chemical solvent resistant masterbatch for chemical barrels, prepared by the above-mentioned chemical solvent resistant masterbatch preparation method for chemical barrels

[0023] The beneficial effects of the technical solution of the present invention are mainly reflected in:

[0024] 1. This solution uses a segmented processing technology, which not only avoids the degradation of material performance due to excessive temperature during processing, but also helps to evenly distribute the materials through multiple mixing;

[0025] 2. In this scheme, a three-roller grinder is used to grind the semi-finished pigment product to reduce the particle size of the semi-finished pigment product powder, ensure the mixing effect of the second mixing, and further improve the uniformity of distribution between the materials;

[0026] 3. In this scheme, ultrafine calcium carbonate and / or active ultrafine calcium carbonate are used as reinforcing agents, wherein the average particle size of the ultrafine calcium carbonate and active ultrafine calcium carbonate is 0.02 μm to 0.1 μm, which has good dispersibility and air tightness, and improves the fineness of the product. DETAILED DESCRIPTION

[0027] In order to make the purpose, advantages and features of the present invention more clearly and in detail, the following non-limiting description of the preferred embodiment will be used for explanation. The embodiment is only a typical example of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0028] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the order of importance, or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The present invention discloses a method for preparing a chemical solvent-resistant masterbatch for chemical barrels and the masterbatch, comprising the following steps:

[0030] A: Preparation of semi-finished pigments:

[0031] a1: Proportion: Proportion the materials according to the following weight parts: 30-40 parts of polyethylene resin, 4-5 parts of dispersant, 10-15 parts of reinforcing agent, 45-50 parts of pigment powder;

[0032] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use;

[0033] a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind for 3 minutes to 5 minutes to prepare a semi-finished colorant;

[0034] B: preparing a second mixed material;

[0035] b1: Proportion: Proportion the materials according to the following weight parts: 70-80 weight parts of semi-finished colorant, 10-20 weight parts of polyethylene resin, 1-2 weight parts of stabilizer, 1-2 weight parts of dispersant, 4-6 weight parts of reinforcing agent;

[0036] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115° C. to 125° C. for 20 min to 25 min to prepare a second mixed material and cool it to room temperature);

[0037] C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch.

[0038] According to the above preparation process, the following embodiments and comparative examples are provided:

[0039] Embodiment 1:

[0040] The following steps are involved:

[0041] A: Preparation of semi-finished pigments:

[0042] a1: Proportion: The materials are proportioned as follows by weight: 35 parts of polyethylene resin, 4 parts of dispersant, 12 parts of reinforcing agent, and 48 parts of pigment toner;

[0043] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use;

[0044] a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind it for 3 to 5 minutes to prepare a semi-finished colorant. The particle size of the semi-finished colorant after grinding is ≤3 mm;

[0045] B: preparing a second mixed material;

[0046] b1: Proportion: Proportion the materials according to the following weight parts: 75 parts of semi-finished colorant, 15 parts of polyethylene resin, 1.5 parts of stabilizer, 1.5 parts of dispersant, 5 parts of reinforcing agent;

[0047] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a second mixed material, and cool it to room temperature for standby use;

[0048] C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110° C. to 130° C. to prepare finished masterbatch M1.

[0049] Embodiment 2:

[0050] A: Preparation of semi-finished pigments:

[0051] a1: Proportion: The materials are proportioned according to the following weight parts: 30 parts of polyethylene resin, 4 parts of dispersant, 10 parts of reinforcing agent, and 45 parts of pigment toner;

[0052] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use;

[0053] a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind it for 3 to 5 minutes to prepare a semi-finished colorant. The particle size of the semi-finished colorant after grinding is ≤3 mm;

[0054] B: preparing a second mixed material;

[0055] b1: Proportion: Proportion the materials according to the following weight parts: 70 parts of semi-finished colorant, 20 parts of polyethylene resin, 1 part of stabilizer, 1 part of dispersant, 4 parts of reinforcing agent;

[0056] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a second mixed material, and cool it to room temperature for standby use;

[0057] C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch M2.

[0058] Embodiment 3:

[0059] A: Preparation of semi-finished pigments:

[0060] a1: Proportion: The materials are proportioned as follows by weight: 40 parts of polyethylene resin, 5 parts of dispersant, 15 parts of reinforcing agent, and 50 parts of pigment powder;

[0061] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use;

[0062] a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind it for 3 to 5 minutes to prepare a semi-finished colorant. The particle size of the semi-finished colorant after grinding is ≤3 mm;

[0063] B: preparing a second mixed material;

[0064] b1: Proportion: Proportion the materials according to the following weight parts: 80 parts of semi-finished colorant, 10 parts of polyethylene resin, 2 parts of stabilizer, 2 parts of dispersant, and 6 parts of reinforcing agent;

[0065] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a second mixed material, and cool it to room temperature for standby use;

[0066] C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch M3.

[0067] Specifically, in the above embodiments 1 to 3, the polyethylene resin is low-density polyethylene, the dispersant is polyethylene wax, the stabilizer is zinc stearate, the reinforcing agent is ultrafine calcium carbonate and / or active ultrafine calcium carbonate, the average particle size of the ultrafine calcium carbonate and the active ultrafine calcium carbonate is 0.02μm to 0.1μm, and the pigment powder is an organic phthalocyanine pigment with bright color and excellent weather resistance and heat resistance, or other pigments with excellent weather resistance and heat resistance.

[0068] Specifically, the working principle of the three-roll mill is as follows: the three rollers are driven by a transmission device and rotate at a certain speed ratio. Since the rollers rotate towards each other and there are pressure and speed differences between them, the materials with poor dispersion are squeezed and sheared by the rollers to enhance the dispersion performance. In this scheme, the pressure of the three-roll mill is set to 0.4MPa and the temperature is set to 60°C.

[0069] Comparative Example 1:

[0070] This comparative example provides a method for preparing a chemical solvent-resistant masterbatch for chemical barrels, comprising the following steps:

[0071] A1: Preparation of semi-finished pigments:

[0072] a1: Proportion: The materials are proportioned as follows by weight: 40 parts of polyethylene resin, 15 parts of reinforcing agent, and 45 parts of pigment toner;

[0073] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for later use;

[0074] a3: Crushing: putting the first mixed material cooled in step a2 into a three-roll mill for crushing and grinding to obtain a semi-finished colorant;

[0075] B2: Preparation of the second mixed material:

[0076] b1: Proportion: Proportion the materials according to the following weight parts: 75 parts of semi-finished colorant, 15 parts of polyethylene resin, 1.5 parts of stabilizer, 5 parts of reinforcing agent;

[0077] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a second mixed material, and cool it to room temperature for standby use;

[0078] C3: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch M4.

[0079] Specifically, the difference between the comparative example 1 and the present solution is that no dispersant is added, and the ratio ranges of other materials are within the ratio ranges of the materials in the present solution. At the same time, the steps and the operation sequence of the steps in the comparative example 1 are the same as those in the present solution.

[0080] Comparative Example 2:

[0081] This comparative example provides a method for preparing a chemical solvent-resistant masterbatch for chemical barrels, comprising the following steps:

[0082] A1: Preparation of semi-finished pigments:

[0083] a1: Proportion: The materials are proportioned according to the following weight parts: 38 parts of polyethylene resin, 2 parts of dispersant, 15 parts of reinforcing agent, and 45 parts of pigment powder;

[0084] a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for later use;

[0085] a3: Crushing: putting the first mixed material cooled in step a2 into a three-roll mill for crushing and grinding to obtain a semi-finished colorant;

[0086] B2: Preparation of the second mixed material:

[0087] b1: Proportion: Proportion the materials according to the following weight parts: 75 parts of semi-finished colorant, 15 parts of polyethylene resin, and 5 parts of reinforcing agent;

[0088] b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a second mixed material, and cool it to room temperature for standby use;

[0089] C3: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch M5.

[0090] Specifically, the difference between Comparative Example 2 and the present solution is that no stabilizer is added, and the ratio ranges of other materials are within the ratio ranges of the materials in the present solution. At the same time, the steps and the operating order of the steps in Comparative Example 2 are the same as those in the present solution.

[0091] Comparative Example 3:

[0092] This comparative example provides a method for preparing a chemical solvent-resistant masterbatch for chemical barrels, comprising the following steps:

[0093] A1: Preparation of pigment materials:

[0094] a1: Mix the materials according to the following weight proportions: 40 parts of polyethylene resin, 2 parts of dispersant, 2 parts of stabilizer, 16 parts of reinforcing agent, and 40 parts of pigment toner.

[0095] a2: Put the polyethylene resin into an internal mixer, set the temperature to 115°C to 125°C, and stir under pressure for 3min to 8min until agglomerates;

[0096] a3: Put the dispersant and stabilizer into the internal mixer and stir them under semi-pressure for 2min to 5min, then put in the reinforcing agent, stir them under semi-pressure for 2min to 5min, then stir them under full pressure for 5min to 10min;

[0097] a4: Put the pigment powder into the internal mixer and stir it under semi-pressure for 2min~5min, then stir it under full pressure for 20min~25min. Raise the pressure cover for 1min every 2min~3min and continue stirring under full pressure. After the operation is completed, take out the pigment material for use;

[0098] B2: Preparation of finished masterbatch: The color material prepared in S1 is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to produce finished masterbatch M6.

[0099] Specifically, the difference between the comparative example 3 and the present solution is that no segmented processing is performed, and no three-roll grinder is used to crush the mixed material. The ratio range of each material in the comparative example 3 is within the ratio range of each material in the present solution.

[0100] Specifically, in order to test the chemical solvent corrosion resistance of the masterbatches prepared by the above embodiments and comparative examples, the masterbatches M1 to M6 were first tested for the Lab value of each masterbatch by the CIE Lab model, and then the masterbatches M1 to M6 were immersed in water, toluene, ethanol, ethyl acetate and methyl ethyl ketone solvents, respectively, and then the Lab values ​​of the masterbatches after immersion in the solvents were tested again after being observed for 72 hours. The color difference value calculation formula was used to calculate the color difference values ​​of various masterbatches after being immersed in different solvents, so as to understand the corrosion resistance of different masterbatches to various chemical solvents. The calculation formula of the color difference value is:

[0101] △E(total color difference)=(△L 2 +△a 2 +△b 2 ) 1 / 2

[0102] The following is the color difference experimental data after the test:

[0103]

[0104] Table 1 Comparison of chemical solvent resistant masterbatch resistance to various solvents for chemical barrels

[0105] According to the above experiments, it can be clearly observed that the masterbatches M1-M3 prepared according to Examples 1-3 have better color difference stability after being soaked in different chemical solvents than the masterbatches M4-M6 prepared according to Comparative Examples 1-3.

[0106] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A method for preparing chemical solvent resistant masterbatch for chemical barrels, characterized by: The following steps are involved: A: Preparation of semi-finished pigments: a1: Proportion: Proportion the materials according to the following weight parts: 30-40 parts of polyethylene resin, 4-5 parts of dispersant, 10-15 parts of reinforcing agent, 45-50 parts of pigment powder; a2: Mixing: Put the materials prepared in step a1 into an internal mixer in order, mix them at a temperature of 115°C to 125°C for 20min to 25min to prepare a first mixed material, then cool it down to room temperature for more than 4 hours for later use; a3: Crushing: Put the first mixed material cooled in step a2 into a three-roll mill and grind for 3 minutes to 5 minutes to prepare a semi-finished colorant; B: preparing a second mixed material; b1： Proportion: Proportion the materials according to the following weight parts: 70-80 weight parts of semi-finished colorant, 10-20 weight parts of polyethylene resin, 1-2 weight parts of stabilizer, 1-2 weight parts of dispersant, 4-6 weight parts of reinforcing agent; b2: Mixing: Put the materials prepared in step b1 into an internal mixer in order, mix them at a temperature of 115° C. to 125° C. for 20 min to 25 min to prepare a second mixed material, and cool it to room temperature; C: Preparation of finished masterbatch: The second mixed material is put into a twin-screw extruder for granulation. The temperature in the twin-screw extruder is controlled at 110°C to 130°C to prepare finished masterbatch; The polyethylene resin is a low-density polyethylene resin, the dispersant is polyethylene wax, the reinforcing agent is active ultrafine calcium carbonate, the average particle size of the active ultrafine calcium carbonate is 0.02 μm to 0.1 μm, the stabilizer is zinc stearate, and the pigment powder is an organic phthalocyanine pigment; In step a3, the particle size of the semi-finished pigment after grinding is ≤3 mm.

2. Chemical solvent resistant masterbatch for chemical barrels, characterized by: The chemical solvent-resistant masterbatch for chemical barrels is prepared by the preparation method of claim 1.

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