CN114479250B - Polyethylene screw cleaning agent and preparation method thereof - Google Patents
Polyethylene screw cleaning agent and preparation method thereof Download PDFInfo
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- CN114479250B CN114479250B CN202011150269.XA CN202011150269A CN114479250B CN 114479250 B CN114479250 B CN 114479250B CN 202011150269 A CN202011150269 A CN 202011150269A CN 114479250 B CN114479250 B CN 114479250B
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
Discloses a polyethylene screw cleaning agent and a preparation method thereof. The polyethylene screw cleaning agent comprises a composition A and a composition B, wherein the composition A comprises LLDPE resin, LDPE resin, inorganic powder, short glass fiber, antioxidant and coupling agent; the composition B comprises mPE resin, LDPE resin, inorganic powder, short glass fiber, antioxidant, coupling agent, sodium silicate, zinc stearate, sodium dodecyl benzene sulfonate and rheology modifier. The polyethylene screw cleaning agent has the advantages of low cost, high residual cleaning efficiency, no toxicity, no smell and environmental protection.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polyethylene screw cleaning agent and a preparation method thereof.
Background
In the plastic field, the most commonly used processing equipment is an injection molding machine and an extruder, a lot of carbon deposition can be generated after long-term use, pigment residues can be generated after pigment production, and the appearance and the performance of the product can be influenced in subsequent production. A common cleaning method is to add a large amount of raw material to the cartridge, heat it, and continuously drain the residue from the cartridge until it is absent. The cleaning method wastes a large amount of raw materials, is time-consuming and not thorough, and needs to disassemble and polish the screw at intervals.
At present, the prior art has made some researches on a method for cleaning a screw. The prior art discloses a screw cleaning agent, which comprises sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, coco diethanolamide, dimethyl siloxane, isopropanol, an emulsifier and deionized water, wherein the emulsifier is a nonylphenol polyoxyethylene ether TX-10 type emulsifier. The cleaning agent prepared by adopting the technical scheme has strong permeability and activation, but the used chemical agent has corrosion effect on the screw and the sleeve.
The patent application No. 201610170389.3 discloses a low-cost solid screw cleaning agent which is prepared from 15-35 parts of matrix resin, 65-85 parts of inorganic powder, 0.3-0.8 part of antioxidant and 3-8 parts of lubricant in parts by weight. The inorganic powder is formed by mixing 70-80% of silicon dioxide, 15-25% of aluminum oxide and 0-5% of second metal oxide according to mass percentage, and the cleaning agent has low manufacturing cost, no toxicity or pollution and low cleaning efficiency.
Therefore, there is a need for a low cost cleaning agent with high cleaning efficiency, no toxicity and no pollution, and a method for preparing and using the same, so as to solve the above technical problems.
Disclosure of Invention
To this end, the object of the present invention is to provide a polyethylene screw cleaning agent which meets the following requirements: the cleaning efficiency is high, and the screw is not corroded; low cost, no toxic and harmful reagent, and more environment protection.
The invention provides a polyethylene screw cleaning agent which is characterized by comprising a composition A and a composition B, wherein the composition A and the composition B respectively comprise the following components in parts by weight:
composition A: 40-60 parts of LLDPE resin, 5-15 parts (preferably 10 parts) of LDPE resin, 25-45 parts of inorganic powder, 5-10 parts of short glass fiber, 0.1-0.2 part of antioxidant and 0.1-1.0 part of coupling agent;
composition B: 55-65 parts (preferably 60 parts) of mPE resin, 10-20 parts (preferably 15 parts) of LDPE resin, 10-20 parts (preferably 15 parts) of inorganic powder, 5-15 parts (preferably 10 parts) of short glass fiber, 0.1-0.2 part of antioxidant, 0.05-0.5 part of coupling agent, 1-2 parts of sodium silicate, 0.1-0.2 part of zinc stearate, 0.2-1.0 part of sodium dodecyl benzene sulfonate and 0.3-0.9 part of rheology modifier.
Wherein the LLDPE resin is a copolymer of ethylene and butene-1 or a copolymer of ethylene and hexene-1 and has a density of 0.91 to 0.92g/cm 3 The melt Mass Flow Rate (MFR) is 10-20g/10min.
Wherein the high pressure low density polyethylene LDPE resin has a melt Mass Flow Rate (MFR) of 4-6g/10min (preferably 5g/10 min).
The mPE resin is a copolymer of ethylene and hexene-1 and has a density of 0.920g/cm 3 The melt Mass Flow Rate (MFR) is 15-30g/10min, and metallocene polyethylenes with a flow and viscosity in this index range are more advantageous for residual carryover than other polyethylene types.
The inorganic powder and the short glass fiber both play a role of scraping and residue. The inorganic powder has the advantages that the hardness is particularly critical, the scraping effect is weak when the hardness is too small, the screw rod is easy to wear when the hardness is too large, and the powder used in the invention is a mixture of calcium carbonate and zinc oxide, and the ratio is 3-5:1, preferably 4:1. The short glass fiber, namely the short glass fiber, is a hard cleaning agent, the scraping effect is optimal when the short glass fiber and the inorganic powder are added in the proportion of 1:4.5-7 (preferably 1:6) in the composition A, but the consumption of the short glass fiber in the composition B is properly increased, so that the short glass fiber is more beneficial to taking out residues in grooves.
The coupling agent is octadecyl polyamide, and the dosage is 0.15-1.5 parts, preferably 0.3-0.6 parts, which is favorable for the dispersion of inorganic powder and glass fiber.
The sodium silicate can effectively remove residues and has the function of preventing dirt deposition. Sodium dodecyl benzene sulfonate is a surfactant.
The rheology modifier is phenyl-terminated hyperbranched polyester, and compared with other hyperbranched polymers containing amino, amido, hydroxyl and other polar groups, the hyperbranched polymer has the advantages of weaker polarity, weaker coating effect on a screw rod and larger phenyl space to play a role in disentangling a polyethylene molecular chain. The addition amount of the hyperbranched polymer is 0.3-0.9 part, and the fluidity is increased when the addition amount is increased, but the viscosity of the whole system is reduced at the same time, so that the residual carryover is not facilitated.
The invention also provides a preparation method of the polyethylene screw cleaning agent, which comprises the following steps:
(1) Preparation of composition A: 40-60 parts of LLDPE resin, 5-15 parts (preferably 10 parts) of LDPE resin, 25-45 parts of inorganic powder, 5-10 parts of short glass fiber, 0.1-0.2 part of antioxidant and 0.1-1.0 part of coupling agent are added into a high-speed mixer, fully mixed for 10-20 minutes to obtain premix, and then granulated for later use, and the premix is recorded as composition A.
(2) Preparation of composition B: 55-65 parts (preferably 60 parts) of mPE resin, 10-20 parts (preferably 15 parts) of LDPE resin, 10-20 parts (preferably 15 parts) of inorganic powder, 5-15 parts (preferably 10 parts) of short glass fiber, 0.1-0.2 part of antioxidant, 0.05-0.5 part of coupling agent, 1-2 parts of sodium silicate, 0.1-0.2 part of zinc stearate, 0.2-1.0 part of sodium dodecyl benzene sulfonate and 0.3-0.9 part of rheology modifier are added into a high-speed mixer, fully mixed for 10-20 minutes to obtain premix, and then granulated for later use, and the premix is recorded as composition B.
The invention also provides a using method of the polyethylene screw cleaning agent, which comprises the following steps: when in use, the A is added firstly, and the composition B is added after 5 to 15 minutes according to the carbon deposition of the screw or the adhesion condition of the pigment.
The composition A mainly plays a role in scraping, and the composition B mainly plays a role in removing dead corners and carrying residues.
Compared with the prior art, the invention has the following advantages:
(1) The cost is low; (2) the residual cleaning efficiency is high. And (3) the product is nontoxic, odorless, green and environment-friendly.
In the prior art, a composition or two compositions are added at the same time, the A, B composition is different in different types, the composition A mainly plays a role in scraping, and the combination of inorganic powder and short glass fibers plays a role in scraping residues. The base resin in the composition B is mPE, and the viscosity and fluidity of the selected resin are suitable for eliminating dead angles and carrying out carbon deposition.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are given for the purpose of better understanding of the present invention, and therefore, are not to be construed as limiting the scope of the present invention, since numerous insubstantial modifications and adaptations of the invention will now occur to those skilled in the art in light of the teaching herein.
Example 1
Composition A (S1-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (S1-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
Preparation of S1-A: 50 parts of LLDPE resin, 10 parts of LDPE resin and CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercial HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent are added into a high-speed mixer,fully mixing for 10-20 minutes to obtain premix, and granulating for standby.
Preparation of S1-B: 60 parts of mPE resin, 15 parts of LDPE resin and CaCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1-2 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of phenyl-terminated hyperbranched polymer are added into a high-speed mixer, fully mixed for 10-20 minutes to obtain premix, and then granulated for standby.
When in use, the S1-A is added first, and the composition S1-B is added after 10 minutes.
Example 2
Composition A (S2-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 8 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (S2-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
S2-A, S2-B was prepared as in example 1. When in use, S2-A is added first, and S2-B is added after 10 minutes.
Example 3
Composition A (S3-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 30 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 6 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (S3-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
S3-A, S3-B was prepared as in example 1. When in use, the S3-A is added first, and the composition S3-B is added after 10 minutes.
Example 4
Composition A (S4-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 20 parts of powder (1000 meshes), 10 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (S4-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
S4-A, S4-B was prepared as in example 1. When in use, the S4-A is added first, and the composition S4-B is added after 10 minutes.
Comparative example 1 composition A inorganic powder less than 25 parts
Composition A (D1-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 15 parts of powder (1000 meshes), 5 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D1-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
D1-A, D1-B was prepared as in example 1. When in use, D1-A is added first, and composition D1-B is added after 10 minutes.
Comparative example 2-composition A inorganic powder more than 45 parts
Composition A (D2-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 48 parts of powder (1000 meshes), 12 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber and anti-aging agent0.2 part of oxygen agent and 0.7 part of coupling agent.
Composition B (D2-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
D2-A, D2-B was prepared as in example 1. When in use, D2-A is added first, and composition D2-B is added after 10 minutes.
Comparative example 3-composition A short glass fiber less than 5 parts
Composition A (D3-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 3 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D3-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
D3-A, D3-B was prepared as in example 1. When in use, D3-A is added first, and composition D3-B is added after 10 minutes.
Comparative example 4-composition A short glass fiber more than 10 parts
Composition A (D4-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 15 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D4-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 15 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
The preparation of D4-A, D4-B was as in example 1. When in use, D4-A is added first, and composition D4-B is added after 10 minutes.
Comparative example 5 simultaneous addition of compositions A-B rather than sequential addition of compositions A-B
Composition A (D5-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D5-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
The preparation of D5-A, D5-B was as in example 1. D5-A, D5-B is added simultaneously during use.
Comparative example 6-composition B the mPE resin employed has an MFR of less than 15g/10min
Composition A (D6-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D6-B): mPE resin (ethylene, hexene-1 copolymerization, mfr=5.0 g/10min, density 0.935 g/cm) 3 ) 60 parts of LDPE resin 15 parts of CaCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
D6-A, D6-B was prepared as in example 1. When in use, D6-A is added first, and composition D6-B is added after 10 minutes.
Comparative example 7-composition B employs LLDPE resin instead of mPE resin
Composition A (D7-A): LLDPE resin (ethylene, butene-1 copolymerization, MFR=10.0 g/10min, density)0.910g/cm 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D7-B): LLDPE resin (copolymerization of ethylene and hexene-1, MFR=20.0 g/10min, density 0.920 g/cm) 3 ) 60 parts of LDPE resin 15 parts of CaCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of terminal phenyl hyperbranched polyester.
The preparation of D7-A, D7-B was as in example 1. The composition D7-B is added 10min after D7-A is added.
Comparative example 8-rheology modifier hydroxyl-terminated hyperbranched polyester was used instead of phenyl-terminated hyperbranched polyester
Composition A (D8-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D8-B): 60 parts of mPE resin (MFR=20.0 g/10 min), 15 parts of LDPE resin, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of hydroxyl-terminated hyperbranched polyester.
The preparation of D8-A, D8-B was as in example 1. When in use, D8-A is added first, and composition D8-B is added after 10 minutes.
Comparative example 9-rheology modifier hyperbranched polyamides are used instead of terminal phenyl hyperbranched polyesters
Composition A (D9-A): LLDPE resin (copolymerization of ethylene and butene-1, MFR=10.0 g/10min, density 0.910 g/cm) 3 ) 50 parts of LDPE resin 10 parts of CaCO 3 24 parts of powder (1000 meshes), 6 parts of ZnO (commercially available HXJ-01), 5 parts of short glass fiber, 0.2 part of antioxidant and 0.7 part of coupling agent.
Composition B (D9-B): mPE resin (mfr=20.0 g/10 min) 60 parts, LDPE resin 15 parts, caCO 3 12 parts of powder (1000 meshes), 3 parts of ZnO (commercially available HXJ-01), 10 parts of short glass fiber, 0.2 part of antioxidant, 0.5 part of coupling agent, 1.5 parts of sodium silicate, 0.1 part of zinc stearate, 0.3 part of sodium dodecyl benzene sulfonate and 0.6 part of hyperbranched polyamide.
The preparation of D9-A, D-B was as in example 1. When in use, D9-A is added first, and composition D9-B is added after 10 minutes.
And extruding 5kg of colored products by a double-screw extruder, adding the cleaning agents respectively after the process is finished until the extrudate does not contain variegated colors, and recording the consumption and time consumption of the cleaning agents. The diameter of the screw rod is 21.65mm, the length-diameter ratio is 44/1, the temperature of each stage is 170 ℃, 190 ℃, 220 ℃, 230 ℃, and the host 286r/min, and the feeding is 15.5Hz.
The evaluation of the effect of eliminating residues in examples and comparative examples is shown in Table 1.
Table 1 cleaning agent effect
(1) As can be seen from example 1 and comparative examples 1, 2, 3 and 4, the inorganic powder amount in the composition A was 25 to 45 parts, and the cleaning effect was optimal when the short glass fiber amount was 5 to 10 parts.
(2) As can be seen from examples 1, 2, 3, 4, the inorganic powder: the cleaning effect is optimal when the short glass fiber is 6:1 and the ratio of calcium carbonate to zinc oxide in the inorganic powder is 4:1.
(3) As can be seen from examples 1 and 8 and 9, the cleaning effect was poor when the hyperbranched polymer containing polar groups was used.
(4) As can be seen from example 1, comparative example 6 and comparative example 7, the metallocene polyethylene has a better cleaning effect than the conventional linear low density polyethylene product, and has a density of 0.920g/cm 3 A melt Mass Flow Rate (MFR) of 15-30g/10minThe metallocene polyethylene of (2) has better cleaning effect than other polyethylene types.
(5) As can be seen from example 1 and comparative example 5, the cleaning agent was inferior in cleaning effect when the cleaning agent was used improperly.
Claims (6)
1. A use method of a polyethylene screw cleaning agent is characterized in that,
the polyethylene screw cleaning agent comprises a composition A and a composition B, wherein the composition A and the composition B respectively comprise the following components in parts by weight:
composition A: 40-60 parts of LLDPE resin, 5-15 parts of LDPE resin, 25-45 parts of inorganic powder, 5-10 parts of short glass fiber, 0.1-0.2 part of antioxidant and 0.1-1.0 part of coupling agent;
composition B: 55-65 parts of mPE resin, 10-20 parts of LDPE resin, 10-20 parts of inorganic powder, 5-15 parts of short glass fiber, 0.1-0.2 part of antioxidant, 0.05-0.5 part of coupling agent, 1-2 parts of sodium silicate, 0.1-0.2 part of zinc stearate, 0.2-1.0 part of sodium dodecyl benzene sulfonate and 0.3-0.9 part of rheology modifier; wherein the rheology modifier is phenyl-terminated hyperbranched polyester;
the using method of the polyethylene screw cleaning agent comprises the following steps: when in use, the composition A is firstly added, and the composition B is added after 5-15 minutes;
wherein the mPE resin is a copolymer of ethylene and hexene-1, and the melt mass flow rate is 15-30g/10min.
2. The method of using a polyethylene screw cleaner as claimed in claim 1, wherein the LLDPE resin is a copolymer of ethylene and butene-1 or a copolymer of ethylene and hexene-1, and the melt mass flow rate is 10 to 20g/10min.
3. The method of using a polyethylene screw cleaner as claimed in claim 1, wherein the LDPE resin melt mass flow rate is 4-6g/10min.
4. The method for using a polyethylene screw cleaner according to claim 1, wherein the inorganic powder is a mixture of calcium carbonate and zinc oxide.
5. The method for using the polyethylene screw cleaner according to claim 1, wherein in the composition A, the ratio of the short glass fiber to the inorganic powder is 1:4.5-7.
6. The method for using the polyethylene screw cleaner according to any one of claims 1 to 5, wherein the method for preparing the polyethylene screw cleaner comprises the steps of:
(1) Preparation of composition A: adding 40-60 parts of LLDPE resin, 5-15 parts of LDPE resin, 25-45 parts of inorganic powder, 5-10 parts of short glass fiber, 0.1-0.2 part of antioxidant and 0.1-1.0 part of coupling agent into a high-speed mixer, fully mixing to obtain premix, granulating for later use, and marking as a composition A;
(2) Preparation of composition B: 55-65 parts of mPE resin, 10-20 parts of LDPE resin, 10-20 parts of inorganic powder, 5-15 parts of short glass fiber, 0.1-0.2 part of antioxidant, 0.05-0.5 part of coupling agent, 1-2 parts of sodium silicate, 0.1-0.2 part of zinc stearate, 0.2-1.0 part of sodium dodecyl benzene sulfonate and 0.3-0.9 part of rheology modifier are added into a high-speed mixer, fully mixed to obtain premix, and then granulated for standby, and the premix is recorded as composition B.
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