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Floor heating heating pipe with low linear expansion coefficient and preparation method thereof

A technology of linear expansion coefficient and heating pipe, which is applied in the direction of tubular articles, other household appliances, household appliances, etc., can solve the problems of no research on floor heating heating pipes, and the requirements for cross-linking degree and linear expansion coefficient of floor heating heating pipes are not considered. , to reduce the high temperature precipitates, improve the grafting reaction efficiency, and improve the plasticity index.

Active Publication Date: 2020-04-17
济南能源工程集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At the same time, the above two patents and other patents or documents on silane cross-linked polyethylene are mostly for the production of general hot water pipes or cables, and have not conducted research on floor heating heating pipes, nor have they taken into account the effects of floor heating heating pipes on the crosslinking degree and Requirements for linear expansion coefficient

Method used

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  • Floor heating heating pipe with low linear expansion coefficient and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Floor heating heating pipe with a nominal outer diameter of 16mm and a nominal wall thickness of 1.8mm with a low coefficient of linear expansion.

[0029] The formula of the heating tube: HDPE: 85kg; LDPE: 7.5kg; PPR: 7.5kg; vinyltrimethoxysilane: 0.40kg; dicumyl peroxide: 0.035kg; dibutyltin dilaurate: 0.50kg; Dosage 1010: 0.040kg.

[0030] The key steps and key parameters for preparing the above heating tube are as follows:

[0031] (1) Matrix resin drying, drying temperature: 95°C, drying time: 1.9h / t.

[0032] (2) Four-stage single-screw extrusion molding, screw diameter: 80mm, screw length-to-diameter ratio: 30, the temperature of the feeding section is 185°C, the temperature of the melting section is 208°C, the temperature of the homogenization section is 217°C, and the temperature of the reaction section is 230°C, the head temperature is 230°C.

[0033] (3) Argon vacuum calibration, the vacuum degree is 1.4bar.

[0034] (4) Compressed air purging, the compre...

Embodiment 2

[0038] Floor heating heating pipe with a nominal outer diameter of 20mm and a nominal wall thickness of 1.9mm with a low coefficient of linear expansion.

[0039] The formula of the heating tube is: HDPE: 90kg; LDPE: 5.0kg; PPR: 5.0kg; vinyltrimethoxysilane: 0.20kg; dicumyl peroxide: 0.040kg; dibutyltin dilaurate: 0.60kg; Oxygen agent 1010: 0.030kg.

[0040] The key steps and key parameters for preparing the above heating tube are as follows:

[0041] (1) Matrix resin drying, drying temperature: 92°C, drying time: 1.5h / t.

[0042] (2) Four-stage single-screw extrusion molding, screw diameter: 85m, screw length-to-diameter ratio: 35, the temperature of the feeding section is 180°C, the temperature of the melting section is 210°C, the temperature of the homogenization section is 210°C, and the temperature of the reaction section is 225°C, the head temperature is 225°C.

[0043] (3) Argon vacuum calibration, the vacuum degree is 1.2bar.

[0044] (4) Compressed air purging, th...

Embodiment 3

[0048] Floor heating heating pipe with a nominal outer diameter of 25mm and a nominal wall thickness of 2.3mm with a low coefficient of linear expansion.

[0049] The formula weight ratio of the heating tube is composed of: HDPE: 87.5kg; LDPE: 5.5kg; PPR: 7.0kg; vinyltrimethoxysilane: 0.37kg; dicumyl peroxide: 0.032kg; dibutyltin dilaurate: 0.55kg; antioxidant 1010: 0.035kg.

[0050] The key steps and key parameters for preparing the above heating tube are as follows:

[0051] (1) Matrix resin drying, drying temperature: 94°C, drying time: 1.8h / t.

[0052] (2) Four-stage single-screw extrusion molding, screw diameter: 90mm, screw length-to-diameter ratio: 35, the temperature of the feeding section is 182°C, the temperature of the melting section is 205°C, the temperature of the homogenization section is 212°C, and the temperature of the reaction section is 228°C, head temperature is 230°C.

[0053] (3) Argon vacuum calibration, the vacuum degree is 1.3bar.

[0054] (4) Com...

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Abstract

The invention discloses a floor heating system heating pipe with a low linear expansion coefficient and a preparation method thereof. The heating pipe is prepared by performing matrix resin drying, feeding, blending, four-section single screw extrusion forming, argon vacuum sizing, water tank cooling, compressed air purging, traction, cut-to-length cutting, and coiling and crosslinking on matrix resin and an auxiliary agent with the mass ratio being 100: (0.76-1.08), wherein the matrix resin adopts HDPE, LDPE and PPR; the auxiliary agent adopts vinyl trimethoxy silane, dicumyl peroxide, dibutyltin dilaurate and an antioxidant. The heating pipe has the advantages that three types of matrix resin is adopted to be blended to obtain the best performance matching, and the adding of a small amount of auxiliary agent restrains the excessive crosslinking of pipes; through the adoption of a four-section single screw extruder with a large ratio of length to diameter, the grafting reaction efficiency is improved, and through the controlling of temperature, humidity and time, hydrolizing and crosslinking is more sufficient. The pipe has high tenacity and plasticity, and low expansion coefficient, is convenient for construction, and can be widely applied to the floor radiation heating field.

Description

technical field [0001] The invention belongs to the technical field of plastic pipe production, and in particular relates to a floor heating pipe with a low linear expansion coefficient and a preparation method thereof. Background technique [0002] "Low-temperature hot water ground radiation heating", referred to as "floor heating", uses hot water with a temperature not higher than 60°C as the heating medium, circulates in the heating pipes buried below the ground, heats the entire floor, and radiates heat through the ground. It is a heating method that supplies heat to the room through convective heat transfer. Because this heating method has the advantages of hygiene, comfort, energy saving, and space saving, it is widely used. According to the industry standard of the People's Republic of China "Technical Regulations for Radiant Heating and Cooling" (JGJ142-2012), most of the floor heating heating pipes used are plastic pipes, and cross-linked polyethylene (PE-X) pipes a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/14C08K5/134C08K5/14C08K5/5425B29D23/00B29C48/92
CPCB29C48/92B29D23/001C08L23/06C08L2201/08C08L2203/18C08L2205/025C08L2205/03C08L2207/062C08L2207/066C08L2207/14C08L23/14C08K5/1345C08K5/14C08K5/5425
Inventor 尹承磊侯登义张斌郭宇强王相果李宗港亓小鹏李萌
Owner 济南能源工程集团有限公司
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