CN-116804101-B - Polyolefin resin composition and preparation method and application thereof

Abstract

The invention discloses a polyolefin resin composition, a preparation method and application thereof, wherein the polyolefin resin composition comprises, by weight, 60-92 parts of linear PE resin, 2-10 parts of HDPE and 6-30 parts of cyclic polyolefin resin, wherein the content of bicycloheptene in the cyclic polyolefin resin is greater than or equal to 75%, and the heat distortion temperature is greater than or equal to 127 ℃. The polyolefin resin composition provided by the invention has good extinction effect, and is suitable for packaging materials with high extinction effect requirements.

Inventors

• LI LI
• HUANG XIANBO
• YE NANBIAO
• CHEN PINGXU
• LIU LEWEN
• WANG BIN
• FU XIAO

Assignees

• 金发科技股份有限公司

Dates

Publication Date

20260512

Application Date

20220317

Claims (6)

1. 1. A polyolefin resin composition is characterized by comprising the following components in parts by weight: 60-92 parts of linear PE resin HDPE 2-10 parts 6-30 Parts of cyclic polyolefin resin The brand of the HDPE is HDPE 6097, and the HDPE is purchased from China petrochemical group company; The content of the bicycloheptene in the cyclic polyolefin resin is 80-83%, and the thermal deformation temperature is 150-170 ℃.
2. 2. The polyolefin resin composition according to claim 1, wherein the cyclic polyolefin resin is one or more of an ethylene/bicycloheptene copolymer, a propylene/bicycloheptene copolymer or an ethylene/propylene bicycloheptene multipolymer.
3. 3. The polyolefin resin composition according to claim 1, wherein the linear PE resin has a melt index of 0.2-3g/10min at 190 ℃ at 2.16 kg.
4. 4. The polyolefin resin composition according to claim 1, further comprising 0.1 to 0.3 parts of a processing aid.
5. 5. A process for producing the polyolefin resin composition according to any one of claims 1 to 4, comprising the steps of: s1, weighing the components according to the proportion, and premixing to obtain a premix; s2, putting the premix in the step S1 into an extruder, carrying out melt blending, extruding and granulating to obtain the polyolefin resin composition.
6. 6. Use of the polyolefin resin composition according to any of claims 1 to 4 for the preparation of packaging materials.

Description

Polyolefin resin composition and preparation method and application thereof Technical Field The invention relates to the technical field of packaging materials, in particular to a polyolefin resin composition, a preparation method and application thereof. Background Film blowing is a common means for processing polyolefin materials, and matting materials are widely used in packaging and other fields. The extinction materials for film blowing in the market are basically bimodal LLDPE in Nordic industry, and other synthetic chemical companies cannot make similar materials due to patent protection, and the materials are monopolized by Nordic industry. However, due to the large demand in the market, the supply is often insufficient and the price is not enough, and the method for achieving the extinction effect by using the film blowing technology through the modified material has great significance. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a polyolefin resin composition, a preparation method and application thereof. The polyolefin resin composition provided by the invention has good extinction effect, fluidity and other properties, is suitable for packaging materials with high requirements on extinction effect, can overcome technical blockage, and replaces foreign company products. The method is realized by the following technical scheme: a polyolefin resin composition comprises the following components in parts by weight: 60-92 parts of linear PE resin HDPE 2-10 parts 6-30 Parts of cyclic polyolefin resin The content of the bicycloheptene in the cyclic polyolefin resin is more than or equal to 75 percent, and the thermal deformation temperature is more than or equal to 127 ℃. For the cyclic polyolefin resin containing specific content of the bicycloheptene, a commercially available cyclic polyolefin resin product can be adopted, or the preparation method of the existing cyclic polyolefin resin can be referred to for self-control, for example, the bicycloheptene monomer and the ethylene monomer are adopted for copolymerization reaction under the action of a catalyst, the reaction condition and the polymerization degree are controlled, and the existing conventional bicycloheptene content measuring method can be used in the invention. The higher the content of bicycloheptene in the cyclic polyolefin resin, the higher the heat distortion temperature, and the heat distortion temperature was measured according to the method specified in GB/T1634J-2019 section 1-general test method for determination of deformation temperature under load of plastics. Preferably, the content of the bicycloheptene in the cyclic polyolefin resin is 80-83%, and the heat distortion temperature is 150-170 ℃. The bicycloheptene content of the cyclic polyolefin resin affects the flowability and haze of the material. Preferably, the cyclic polyolefin resin is one or more of an ethylene/bicycloheptene copolymer, a propylene/bicycloheptene copolymer or an ethylene/propylene bicycloheptene multipolymer. Further, the linear PE resin is synthesized by taking C4-C8 as a matrix, and the melt index is 0.2-3g/10min at 190 ℃ and 2.16 kg. Further, the HDPE has a viscosity of 2000 to 4000 Pa.s under test conditions of 190 ℃ and 100 HZ. The viscosity test was carried out according to the method specified in ISO 11443-2014 "Plastic flowability determination with capillary and slot die rheometer". Further, the HDPE has a melt index of 0.01-0.3g/10min at 190 ℃ and 2.16kg, a number average molecular weight of 25000-60000 and a molecular weight distribution of 3-6. Preferably, the HDPE has a melt index of 0.03-0.1g/10min at 190℃and 2.16kg, a number average molecular weight of 35000-50000 and a molecular weight distribution of 4-5. Further, 0.1 to 0.3 part of processing aid is included. The processing aid is one or more of an antioxidant or an anti-aging agent. The present invention also provides a method for preparing the above polyolefin resin composition, comprising the steps of: s1, weighing the components according to the proportion, and premixing to obtain a premix; s2, putting the premix in the step S1 into an extruder, carrying out melt blending, extruding and granulating to obtain the polyolefin resin composition. Further, the extruder is a double-screw extruder, the length-diameter ratio of the screw of the double-screw extruder is (36-48) 1, the temperature of the screw cylinder of the double-screw extruder is 180-220 ℃, the rotating speed of the screw of the double-screw extruder is 300-600r/min, and the proper length-diameter ratio of the screw is favorable for uniform distribution of components. The invention also provides application of the polyolefin resin composition in preparing packaging materials, such as food packaging and the like. Compared with the prior art, the invention has the beneficial effects that: (1) The invention discloses a polyolefin resin composition, which uses linear P