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CN-121991605-A - Preparation method of polypropylene adhesive for pipeline corrosion prevention

CN121991605ACN 121991605 ACN121991605 ACN 121991605ACN-121991605-A

Abstract

The invention relates to the technical field of pipeline anti-corrosion materials, and discloses a preparation method of a polypropylene adhesive for pipeline anti-corrosion, which comprises the following steps of (a) providing polypropylene matrix resin, anhydride grafted polypropylene and the like; the preparation method comprises the steps of (a) placing polypropylene matrix resin, anhydride grafted polypropylene, tackifying resin, elastomer, antioxidant and plasticizer in mixing equipment, mixing at low speed at room temperature to 60 ℃ to obtain premix, and (C) adding the premix, filler, curing agent and diluent into a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulation to obtain the polypropylene adhesive for pipeline corrosion prevention. Compared with the prior art, the preparation method of the polypropylene adhesive for pipeline corrosion prevention has the advantages that the prepared adhesive has excellent bonding strength, flexibility and ageing resistance through an optimized raw material formula and a specific process flow, is suitable for being prepared into powder form, and is convenient for storage, transportation and coating in pipeline corrosion prevention construction.

Inventors

  • WANG JINGCHENG

Assignees

  • 无锡腾龙塑胶科技有限公司

Dates

Publication Date
20260508
Application Date
20251215

Claims (10)

  1. 1. The preparation method of the polypropylene adhesive for pipeline corrosion prevention is characterized by comprising the following steps of: (a) Providing a polypropylene matrix resin, anhydride grafted polypropylene, a tackifying resin, an elastomer, an antioxidant, a filler, a plasticizer, a curing agent and a diluent; (b) Placing polypropylene matrix resin, anhydride grafted polypropylene, tackifying resin, elastomer, antioxidant and plasticizer in mixing equipment, and mixing at low speed at room temperature to 60 ℃ to obtain premix; (c) Adding the premix obtained in the step (b), a filler, a curing agent and a diluent into a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulation to obtain the polypropylene adhesive for pipeline corrosion prevention; (d) Grinding and crushing the granulated material to obtain polypropylene adhesive powder; The processing temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 200-400 rpm; the plasticizer is at least one selected from phthalate esters, adipate esters or citrate esters; The curing agent is isocyanate compound; the diluent is a low viscosity solvent.
  2. 2. The preparation method of the polypropylene adhesive for pipeline corrosion prevention of claim 1 is characterized in that in the step (a), each component comprises, by weight, 40-70 parts of a polypropylene matrix resin, 5-15 parts of anhydride grafted polypropylene, 5-20 parts of a tackifying resin, 5-15 parts of an elastomer, 0.1-2 parts of an antioxidant, 10-30 parts of a filler, 3-10 parts of a plasticizer, 1-5 parts of a curing agent and 2-8 parts of a diluent.
  3. 3. The method for preparing the polypropylene adhesive for pipeline corrosion prevention according to claim 2, wherein the tackifying resin is at least one selected from petroleum resin, terpene resin and rosin resin.
  4. 4. The method for preparing the polypropylene adhesive for corrosion protection of pipelines according to claim 2, wherein the elastomer is at least one selected from the group consisting of styrene-butadiene-styrene block copolymers, hydrogenated styrene-butadiene-styrene block copolymers and polyolefin elastomers.
  5. 5. The preparation method of the polypropylene adhesive for pipeline corrosion prevention according to claim 2, wherein the filler is an inorganic filler and is at least one selected from calcium carbonate, talcum powder, wollastonite and mica powder.
  6. 6. The preparation method of the polypropylene adhesive for pipeline corrosion prevention according to claim 2, wherein the antioxidant is a compound system of phenolic antioxidants or phosphorus antioxidants.
  7. 7. The method for preparing the polypropylene adhesive for pipeline corrosion prevention according to claim 1, wherein in the step (b), the rotation speed of low-speed mixing is 100-500 rpm, and the mixing time is 5-30 minutes.
  8. 8. The preparation method of the polypropylene adhesive for pipeline corrosion prevention according to claim 1, wherein in the step (d), the particle size of the polypropylene adhesive powder obtained after grinding and crushing is 50-200 meshes.
  9. 9. The method for preparing the polypropylene adhesive for pipeline corrosion prevention according to claim 1, wherein the diluent is at least one of acetone, ethyl acetate, toluene or xylene.
  10. 10. The method for preparing the polypropylene adhesive for pipeline corrosion prevention according to claim 1, wherein in the melt blending process of the step (c), the length-diameter ratio of the twin-screw extruder is 30:1 to 48:1.

Description

Preparation method of polypropylene adhesive for pipeline corrosion prevention Technical Field The invention relates to the technical field of pipeline anti-corrosion materials, in particular to a preparation method of a polypropylene adhesive for pipeline anti-corrosion. Background Polypropylene has been widely used in the field of pipeline corrosion prevention due to its excellent chemical stability, mechanical properties and lower cost. However, polypropylene itself is nonpolar, has low surface energy and high crystallinity, resulting in poor adhesion to metal pipes or other substrates, which limits its direct application in the field of heavy-duty adhesives. In order to improve the adhesive property of polypropylene, various methods such as surface treatment, blending modification and the like are commonly used in the prior art. Among these, the addition of polar components (such as anhydride-grafted polypropylene) by melt blending is an effective means. However, simple polar modification often has disadvantages in toughness, construction suitability (e.g., powdering), or long-term aging resistance. For example, some of the solutions focus on improving adhesion but sacrificing flexibility of the material, while others may introduce complex post-treatment processes for powdering, increasing energy consumption and cost. In addition, how to effectively disperse various functional additives in a high molecular weight resin system and ensure that the final product has stable comprehensive performance is still a technical problem to be solved in the field. Therefore, the development of the preparation method of the polypropylene adhesive which is reasonable in process, excellent in comprehensive performance and particularly suitable for pipeline corrosion prevention has important practical significance. Disclosure of Invention The technical problem to be solved by the invention is to overcome the technical difficulties, and provide a preparation method of the polypropylene adhesive for pipeline corrosion prevention, and the prepared adhesive has excellent bonding strength, flexibility and ageing resistance through an optimized raw material formula and a specific process flow, is suitable for being prepared into powder form, and is convenient for storage, transportation and coating in pipeline corrosion prevention construction. In order to solve the technical problems, the technical scheme provided by the invention is as follows: The preparation method of the polypropylene adhesive for pipeline corrosion prevention comprises the following steps: (a) Providing a polypropylene matrix resin, anhydride grafted polypropylene, a tackifying resin, an elastomer, an antioxidant, a filler, a plasticizer, a curing agent and a diluent; (b) Placing polypropylene matrix resin, anhydride grafted polypropylene, tackifying resin, elastomer, antioxidant and plasticizer in mixing equipment, and mixing at low speed at room temperature to 60 ℃ to obtain premix; (c) Adding the premix obtained in the step (b), a filler, a curing agent and a diluent into a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulation to obtain the polypropylene adhesive for pipeline corrosion prevention; (d) Grinding and crushing the granulated material to obtain polypropylene adhesive powder; The processing temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 200-400 rpm; the plasticizer is at least one selected from phthalate esters, adipate esters or citrate esters; The curing agent is isocyanate compound; the diluent is a low viscosity solvent. In the step (a), the components comprise, by weight, 40-70 parts of a polypropylene matrix resin, 5-15 parts of acid anhydride grafted polypropylene, 5-20 parts of a tackifying resin, 5-15 parts of an elastomer, 0.1-2 parts of an antioxidant, 10-30 parts of a filler, 3-10 parts of a plasticizer, 1-5 parts of a curing agent and 2-8 parts of a diluent. Further, the tackifying resin is at least one selected from petroleum resin, terpene resin and rosin resin. Further, the elastomer is at least one selected from the group consisting of styrene-butadiene-styrene block copolymers, hydrogenated styrene-butadiene-styrene block copolymers, and polyolefin elastomers. Further, the filler is an inorganic filler and is at least one selected from calcium carbonate, talcum powder, wollastonite and mica powder. Further, the antioxidant is a compound system of a phenolic antioxidant or a phosphorus antioxidant. In the step (b), the rotation speed of low-speed mixing is 100-500 rpm, and the mixing time is 5-30 minutes. In the step (d), the particle size of the polypropylene adhesive powder obtained after grinding and crushing is 50-200 meshes. Further, the diluent is at least one of acetone, ethyl acetate, toluene or xylene. Further, during the melt blending of step (c), the twin screw extruder has an aspect ratio of 30:1 to 48:1. It is worth mentioning that the