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Polyethylene powder coating suitable for pipeline and method

A polyethylene powder and powder coating technology, applied in powder coatings, coatings and other directions, can solve the problems of high cost, poor coating film hardness, wear resistance and mechanical strength, complex raw materials, etc., and achieve strong adhesion and excellent adhesion. Focused, simple ingredients

Inactive Publication Date: 2019-04-26
SHANGHAI BANGZHONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But, also there are some weak points in the polyethylene powder coating of prior art: the hardness of coating film, abrasion resistance and mechanical strength are poor; Shot blasting, surface treatment or priming
[0004] In addition, the Chinese patent with the publication number CN104629544A, a tough polyethylene powder coating containing nano-carbon fiber grafted activated organic bentonite and its preparation method, discloses a tough polyethylene powder coating containing nano-carbon fiber grafted activated organic bentonite Ethylene powder coating and its preparation method. The powder coating is made of the following raw materials in parts by weight: 400-600 mesh organic bentonite 4-8, carboxymethyl cellulose 1-2, nano-carbon fiber 0.4-0.5, rosin glyceride 3- 5. Silane coupling agent KH-550 2-3, pigment 5-8, polyethylene 42-50, potassium permanganate 0.4-0.5, acrylonitrile-butadiene-styrene resin 10-14, acrylate leveling Agent 1-2, Antioxidant 2-3; In this invention, organobentonite is pre-activated, and nano-carbon fibers are grafted on its surface, which greatly improves the binding force and compatibility of micro-sized fillers and polymer materials , the prepared polyethylene powder coating exhibits good fluidity and adhesion; but the cost of this technical solution is also greatly increased, and too many types of materials also increase the industrial operation of fillers.
[0005] In summary, the prior art polyethylene powder coatings have poor adhesion, complex raw materials, and high costs

Method used

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  • Polyethylene powder coating suitable for pipeline and method
  • Polyethylene powder coating suitable for pipeline and method
  • Polyethylene powder coating suitable for pipeline and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The powder coating used in the present embodiment is the following components and parts by weight:

[0026]

[0027] In this embodiment, the modified high-density polyethylene is maleic anhydride-modified high-density polyethylene with a density of 0.93 g / cm 3 , the melt index is 0.5g / 10min (190°C, under the pressure of 2.16kg), and the grafting rate of maleic anhydride is 0.50%.

[0028] In the present embodiment, its density of low-density polyethylene is 0.92g / cm 3 , the melt index is 40g / 10min (190°C, under 2.16kg pressure).

[0029] In this embodiment, the pigment is rutile titanium dioxide.

[0030] In this example, the stabilizer is a mixture of antioxidant and light stabilizer; the antioxidant is BASF 1010, and the light stabilizer is Tinuvin770; the ratio of antioxidant and light stabilizer is 1:1.

[0031] Prepare powder coatings as follows:

[0032] 1) Weigh low-density polyethylene, modified high-density polyethylene, pigments and stabilizers, etc. in...

Embodiment 2

[0035] The powder coating used in the present embodiment is the following components and parts by weight:

[0036]

[0037] In this example, the modified high-density polyethylene is maleic anhydride-modified high-density polyethylene with a density of 0.97 g / cm 3 , the melt index is 2.5g / 10min (190 ℃, under the pressure of 2.16kg), and the graft rate of maleic anhydride is 1%.

[0038] In the present embodiment, its density of low-density polyethylene is 0.90g / cm 3 , the melt index is 5 / 10min (190°C, under 2.16kg pressure).

[0039] In this embodiment, the pigment is rutile titanium dioxide.

[0040] In this example, the stabilizer is a mixture of antioxidant and light stabilizer; the antioxidant is BASF 1010, and the light stabilizer is Tinuvin770; the ratio of antioxidant and light stabilizer is 1:2.

[0041] Prepare powder coatings as follows:

[0042] 1) Weigh the low-density polyethylene, modified high-density polyethylene, pigment and stabilizer in specified weig...

Embodiment 3

[0045] The powder coating in embodiment 1-2 and 2 kinds of polyethylene powder coatings sold on the market are carried out following experiment:

[0046] 1) adopt the powder coating in embodiment 1-2 and 2 kinds of polyethylene powder coatings sold on the market to make the peeling spline of "polyethylene coating-steel pipe",

[0047] 2) Test according to Appendix A of GBT 28897-2012 standard, test the adhesion of the specimen, the unit is N / cm, the results are as follows:

[0048]

[0049]As can be seen from the above table, the adhesion of the polyethylene coating-steel pipe of the present invention is 35-38N / cm; while the products sold on the market are only 18-20N / cm. It can be seen from the comparison results of the above tests that the special polyethylene powder for pipelines of the present invention can better solve the shortcomings of insufficient adhesion between the currently used polyethylene powder and the metal substrate, and better exert the long-term ...

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Abstract

The invention discloses a polyethylene powder coating suitable for a pipeline and a method. The powder coating is prepared from raw materials in parts by weight as follows: 35-55 parts of modified high-density polyethylene, 30-60 parts of low-density polyethylene, 1-10 parts of pigment and 0.1-2 parts of a stabilizer, wherein modified high-density polyethylene is high-density polyethylene modifiedwith maleic anhydride. The method comprises following steps: 1), the raw materials are mixed in parts by weight; 2), the uniformly mixed materials are added to a twin-screw extruder and extruded, extruded strips are cooled to room temperature through a circulating water channel, are blown and dried by a blower and then enter a dicing cutter for granulation, and the temperature range of each temperature area of the extruder is 150-200 DEG C. The polyethylene powder coating which is attached to the pipeline and has high adhesive force and low cost and the method are provided.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a polyethylene powder coating suitable for pipelines and a method thereof. Background technique [0002] Powder coatings started in the early 1940s. After 60 years of development and improvement, they have conquered the entire coatings field with their high production efficiency, good eco-environmental protection and outstanding economy. Polyethylene powder coatings are made of polyethylene as the main body, adding an appropriate amount of antioxidants, light stabilizers, pigments, modifiers, fillers and other additives. Low-density polyethylene and high-density polyethylene have different properties due to their different molecular structures, densities and crystallinity. Low-density polyethylene is flexible, with low mechanical strength and hardness, and its melting point is only 110-115°C; while high-density polyethylene is tougher, but it has greater rigidity, higher mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D123/26C09D123/06C09D5/03C09D7/61
CPCC09D123/26C08K2003/2241C08L2203/18C08L2207/066C09D5/03C09D5/033C09D123/06C08L23/06C08K13/02C08K3/22C08K3/04C08L23/26
Inventor 欧阳贵毕宏江汪丽杨少辉
Owner SHANGHAI BANGZHONG NEW MATERIAL