阅读说明：本技术 一种钢卷防护包装用高柔韧性塑钢内护板及其制备方法 (High-flexibility plastic steel inner guard plate for steel coil protective packaging and preparation method thereof ) 是由 潘启来 张家敏 黄年华 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种钢卷防护包装用高柔韧性塑钢内护板,按重量份数计,其原料组成包括：PET聚酯100份,增韧剂5～25份,扩链剂0.1～2份,抗氧剂0.5～1.5份,抗水解剂0.5～1.5份；此外,本发明还公开了一种制备上述内护板的方法,包括以下步骤：1)将PET聚酯烘干；2)将干燥后的PET聚酯、增韧剂、抗水解剂投入高速混合机中混合,再投入扩链剂,最后投入抗氧剂,在常温下低速搅拌5～7分钟至原料混合均匀,得到混合料；3)将混合料放出添加到双螺杆挤出机的喂料槽中,在真空条件下经双螺杆挤出机熔融挤出成型。本发明所得的内护板机械力学性能好,制品有较好的刚性和良好的柔韧性,可满足钢卷包装内护板的使用要求。(The invention discloses a high-flexibility plastic steel inner guard plate for steel coil protective packaging, which comprises the following raw materials in parts by weight: 100 parts of PET polyester, 5-25 parts of a toughening agent, 0.1-2 parts of a chain extender, 0.5-1.5 parts of an antioxidant and 0.5-1.5 parts of a hydrolysis resistant agent; in addition, the invention also discloses a method for preparing the inner guard plate, which comprises the following steps: 1) drying the PET polyester; 2) putting the dried PET polyester, the toughening agent and the hydrolysis resistant agent into a high-speed mixer for mixing, then putting the chain extender and finally the antioxidant into the mixer, and stirring the mixture at a low speed for 5 to 7 minutes at normal temperature until the raw materials are uniformly mixed to obtain a mixture; 3) discharging the mixture, adding the mixture into a feeding trough of a double-screw extruder, and carrying out melt extrusion molding through the double-screw extruder under a vacuum condition. The inner guard plate obtained by the invention has good mechanical property, and the product has good rigidity and good flexibility, and can meet the use requirement of the inner guard plate in the steel coil package.)

1. The utility model provides a coil of strip is high pliability plastic steel inner guard plate for protective packaging which characterized in that, by weight, its raw materials composition includes:

the intrinsic viscosity value of the PET polyester is 0.65-1.6 dl/g,

the toughening agent is at least one of ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, ethylene propylene diene monomer-glycidyl methacrylate copolymer (EPDM-g-GMA), glycidyl methacrylate grafted hydrogenated styrene-butadiene-styrene block copolymer (SEBS-g-GMA) and ethylene-octene copolymer grafted glycidyl methacrylate (POE-g-GMA).

2. The steel coil protective packaging high-flexibility plastic steel inner protective plate as claimed in claim 1, wherein the antioxidant is bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphate.

3. The inner plastic steel guard plate for the steel coil protective packaging as claimed in claim 1, wherein the chain extender is at least one of 2,2 ' -bis (2-oxazoline), 1, 3-phenylene-bis (2-oxazoline), 4 ' -methylenebis (2-methyl-6-ethyl) aniline, and 4,4 ' -diphenylmethane diisocyanate.

4. The inner plastic steel guard plate for the steel coil protective packaging as claimed in claim 1, wherein the anti-hydrolysis agent is N, N' -bis (2, 6-diisopropylphenyl) carbodiimide.

5. The inner plastic steel guard plate for the steel coil protective packaging as claimed in claim 1, wherein the grafting ratio of the glycidyl methacrylate in the ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, the ethylene propylene diene monomer-glycidyl methacrylate copolymer (EPDM-g-GMA), the glycidyl methacrylate grafted hydrogenated styrene-butadiene-styrene block copolymer (SEBS-g-GMA), and the ethylene-octene copolymer grafted glycidyl methacrylate (POE-g-GMA) is 0.5-2.0%.

6. A method for preparing the high-flexibility plastic steel inner guard plate for the steel coil protective packaging of any one of claims 1 to 5 is characterized by comprising the following steps:

1) drying the PET polyester in an oven to a water content of less than 0.05%;

2) putting the dried PET polyester, the toughening agent and the hydrolysis resisting agent into a high-speed mixer for mixing, then putting the chain extender and finally the antioxidant into the mixer, and stirring at a low speed for 5-7 minutes at normal temperature until the raw materials are uniformly mixed to obtain a mixture;

3) discharging the mixture, adding the mixture into a feeding groove of a double-screw extruder, and carrying out melt extrusion molding through the double-screw extruder under a vacuum condition, wherein the temperature of each section of the screw is as follows: the feeding section is 235-245 ℃, the conveying section is 250-255 ℃, the melting section is 260-275 ℃, and the machine head is 255-270 ℃.

7. The method for preparing the high-flexibility plastic steel inner guard plate for the steel coil protective packaging according to claim 6, wherein the drying temperature in the step 1) is 110-120 ℃, and the drying time is 4-6 hours.

8. The method for preparing the high-flexibility plastic steel inner guard plate for the steel coil protective packaging according to claim 6, wherein the rotation speed of the low-speed stirring in the step 2) is 60-90 revolutions per minute.

9. The method for preparing the high-flexibility plastic steel inner guard plate for the steel coil protective packaging according to claim 6, wherein the vacuum condition in the step 3) is 300-1000 Pa.

Technical Field

The invention belongs to the technical field of packaging materials, and particularly relates to a high-flexibility plastic steel inner guard plate for steel coil protective packaging and a preparation method thereof.

Background

High-quality steel coils such as metallurgical tin-plated thin plates, galvanized plates, cold-rolled plates, color-coated plates, silicon steel plates and the like are easily damaged by impact in the transportation process, so that the quality of the whole coil of coils is influenced, and the front protection of the coils is particularly important. The inner guard plate for the front protection package of the existing steel coil is mainly made of polyethylene plastics, and the polyethylene inner guard plate has the defects of low bending strength (generally below 15 MPa), insufficient rigidity, poor flexibility and the like.

Disclosure of Invention

The invention aims to overcome one of the defects in the prior art and provides a high-flexibility plastic steel inner guard plate for steel coil protective packaging, which comprises the following raw materials in parts by weight:

the intrinsic viscosity value of the PET polyester is 0.65-1.6 dl/g,

the toughening agent is at least one of ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, ethylene propylene diene monomer-glycidyl methacrylate copolymer (EPDM-g-GMA), glycidyl methacrylate grafted hydrogenated styrene-butadiene-styrene block copolymer (SEBS-g-GMA) and ethylene-octene copolymer grafted glycidyl methacrylate (POE-g-GMA).

Further, the antioxidant is bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphate.

Further, the chain extender is at least one of 2,2 ' -bis (2-oxazoline), 1, 3-phenylene-bis (2-oxazoline), 4 ' -methylenebis (2-methyl-6-ethyl) aniline and 4,4 ' -diphenylmethane diisocyanate.

Further, the anti-hydrolysis agent is N, N' -bis (2, 6-diisopropylphenyl) carbodiimide.

Furthermore, the grafting ratio of the glycidyl methacrylate in the ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, the ethylene propylene diene monomer-glycidyl methacrylate copolymer (EPDM-g-GMA), the glycidyl methacrylate grafted hydrogenated styrene-butadiene-styrene block copolymer (SEBS-g-GMA) and the ethylene-octene copolymer grafted glycidyl methacrylate (POE-g-GMA) is 0.5 to 2.0 percent.

In addition, the invention also discloses a method for preparing the high-flexibility plastic steel inner guard plate for the steel coil protective package, which comprises the following steps:

1) drying the PET polyester in an oven to a water content of less than 0.05%;

2) putting the dried PET polyester, the toughening agent and the hydrolysis resisting agent into a high-speed mixer for mixing, then putting the chain extender and finally the antioxidant into the mixer, and stirring at a low speed for 5-7 minutes at normal temperature until the raw materials are uniformly mixed to obtain a mixture;

3) discharging the mixture, adding the mixture into a feeding groove of a double-screw extruder, and carrying out melt extrusion molding through the double-screw extruder under a vacuum condition, wherein the temperature of each section of the screw is as follows: the feeding section is 235-245 ℃, the conveying section is 250-255 ℃, the melting section is 260-275 ℃, and the machine head is 255-270 ℃.

Further, the drying temperature in the step 1) is 110-120 ℃, and the drying time is 4-6 hours.

Further, the rotating speed of the low-speed stirring in the step 2) is 60-90 revolutions per minute.

Further, the vacuum condition in the step 3) is 300-1000 Pa.

The toughening agent is adopted to improve the impact resistance of the inner guard plate, the chain extender is favorable for improving the mechanical property of the inner guard plate, and the hydrolysis resistance agent is favorable for improving the mechanical property of the inner guard plate and the adaptability to harsh environments such as moisture resistance, acid and alkali resistance and the like; the inner guard plate obtained by the invention has good mechanical property, the bending strength is more than 30MPa, and the impact strength of the simple beam gap is more than 20KJ/m²The product has better rigidity and flexibility, can meet the use requirement of the inner guard plate of the steel coil package, and has remarkable economic benefit and social benefit.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.