Low temperature squeeze cladding material used for gunpowder cladding and preparation method

A coating material and gunpowder pack technology are applied in the field of low temperature extrusion coating material and preparation field coated with gunpowder, and can solve the problems of poor mechanical properties, poor ablation resistance, few types of thermoplastic coating materials, and high extrusion temperature. , to achieve the effect of good thermal stability, guaranteed ablation resistance and low viscous flow temperature

Inactive Publication Date: 2014-07-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are few types of thermoplastic coating materials currently used for extrusion coating. The commonly reported ones are cellulose acetate-based materials, which have poor mechanical properties and ablation resistance, and the extrusion temperature is relatively high, generally between 150 and 190 o Between C, a lot of pressure is required, and it is easy to cause part of the primer to be washed away, resulting in the scrapping of the charge and causing major economic losses.

Method used

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  • Low temperature squeeze cladding material used for gunpowder cladding and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1: Weigh 75 grams of butyl methacrylate-styrene copolymer pellets, 24 grams of methyl silicone resin powder, 36 grams of aluminum hydroxide (commercially available), 150 grams of hybrid filler, phthalate di Butyl ester 15 grams. Mix the above powder and pellets in a high-speed mixer. At a feeding speed of 1kg / min, the extrusion temperature is 115°C in the first zone, 120°C in the second zone, 125°C in the third zone, 125°C in the fourth zone, and 128°C in the fifth zone. Die 110°C, screw speed 50r / min, feed into a twin-screw extruder, extrude, cool, and pelletize to obtain the low-temperature extrusion coating material for gunpowder coating of the present invention. Tensile strength 4.5MPa, elongation at break 80%, viscous flow temperature 126 o C, the linear ablation rate is 0.1410mm / s.

Embodiment 2

[0015] Embodiment 2: Weigh 105 grams of butyl methacrylate-styrene copolymer pellets, 18 grams of methyl silicone resin powder, 30 grams of aluminum hydroxide, 135 grams of hybrid filler, 12 grams of dibutyl phthalate . Mix the above powder and pellets in a high-speed mixer. At a feeding speed of 1kg / min, the extrusion temperature is 115°C in the first zone, 120°C in the second zone, 125°C in the third zone, 125°C in the fourth zone, and 128°C in the fifth zone. Die 110°C, screw speed 50r / min, feed into a twin-screw extruder, extrude, cool, and pelletize to obtain the low-temperature extrusion coating material for gunpowder coating of the present invention. Tensile strength 3.9MPa, elongation at break 142%, viscous flow temperature 120 o C, the linear ablation rate is 0.2521mm / s.

Embodiment 3

[0016] Embodiment 3: Weigh 117 grams of butyl methacrylate-styrene copolymer pellets, 18 grams of methyl silicone resin powder, 33 grams of aluminum hydroxide, 120 grams of hybrid filler, 12 grams of dibutyl phthalate . Mix the above powder and pellets in a high-speed mixer. At a feeding speed of 1kg / min, the extrusion temperature is 115°C in the first zone, 120°C in the second zone, 125°C in the third zone, 125°C in the fourth zone, and 128°C in the fifth zone. Die 110°C, screw speed 50r / min, feed into a twin-screw extruder, extrude, cool, and pelletize to obtain the low-temperature extrusion coating material for gunpowder coating of the present invention. Tensile strength 3.7MPa, elongation at break 185%, viscous flow temperature 120 o C, the linear ablation rate is 0.2783mm / s.

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Abstract

The invention discloses a low temperature squeeze cladding material used for gunpowder cladding and a preparation method. The low temperature squeeze cladding material used for gunpowder cladding is prepared by: subjecting a butyl methacrylate-styrene copolymer particle, methyl silicon resin powder, aluminum hydroxide, a hybrid filling material and a plasticizer that are in a mass percentage of 25-55:5-8:7-12:30-50:3-5 to high-speed mixing and extrusion pelletizing. The hybrid filling material is an organic-inorganic hybrid core-shell structured particle. The low temperature squeeze cladding material used for gunpowder cladding disclosed in the invention can be used to clad gunpowder by means of squeeze molding at a low temperature, and has good ablation resistance and mechanical performance. The production process is simple, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of gunpowder coating materials, in particular to a low-temperature extrusion coating material for gunpowder coating and a preparation method thereof. Background technique [0002] The cladding layer is a heavy component of the solid rocket propellant charge. Its basic function is to control the combustion area of ​​the propellant charge, and at the same time it plays a role of heat insulation for the engine casing. Its performance determines the rocket engine. working condition and service life. With the continuous improvement of rocket technology, a variety of polymer materials are used for coating. Common coating techniques include dip coating, casting coating, patch coating, extrusion coating, etc. The use of extrusion coating to coat gunpowder is a new technology in the field of gunpowder coating. It heats the coating material particles to a viscous state in a short time, and squeezes them under pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/14C08L83/04C08L83/06C08K3/22C08K5/12
Inventor 王新龙杨娟王菲
Owner NANJING UNIV OF SCI & TECH
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