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Dual-layer composite soft plastic foaming plate and molding method thereof

A foamed sheet, double-layer composite technology, applied in the field of materials, can solve the problems of high structural requirements, harsh conditions, rarely used, etc., and achieve the effects of simple process, short production cycle, excellent comprehensive functions and cost-effectiveness

Inactive Publication Date: 2008-10-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used for the compounding of plastics with large differences in physical properties and high layer thickness requirements. Due to its harsh conditions, it has high requirements for the structure of the cavity flow channel of each layer of the mold, and it is difficult to design, so it is rarely used.

Method used

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  • Dual-layer composite soft plastic foaming plate and molding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The processed double-layer composite soft-faced plastic foam board has a width of 100 mm and a thickness of 7 mm, of which the soft face layer is 4 mm and the hard bottom layer is 3 mm. The formula is as follows:

[0062] Hard bottom layer formula: (both are weight ratio)

[0063] Polyvinyl chloride resin SG-7 type 100 parts Acrylic flow modifier ACR401 2 parts

[0064] Ca / Zn composite heat stabilizer 4 parts Acrylate lubricant modifier K175 0.5 part

[0065] Foaming agent AC-410 0.1 parts Active light calcium carbonate 8 parts

[0066] Cell regulator ACR530 5 parts

[0067] Soft Topping Recipe:

[0068] Polyvinyl chloride resin 2500 type 100 parts stearic acid 0.4 parts

[0069] Calcium-zinc composite heat stabilizer 4 parts paraffin wax 0.2 parts

[0070] Foaming agent AC-410 0.2 parts Antimony trioxide 5 parts

[0071] Dioctyl phthalate 80 parts Active light calcium carbonate 5 parts

[0072] Dioctyl sebacate 20 parts Phthalocyanine blue 0.001 parts

[0073]...

Embodiment 2

[0083] The width of the double-layer composite soft-faced plastic foam board is 300mm and the thickness is 9mm, of which the soft surface layer is 5mm and the hard bottom layer is 4mm. The recipe is the same as Example 1, and the process parameters are set as follows:

[0084] Hard bottom layer: single-screw extruder, screw diameter 90mm, aspect ratio 25, compression ratio 3:1. The barrel heating zone 1 is 160°C, the second zone is 185°C, the third zone is 173°C, the fourth zone is 187°C, and the fifth zone is 155°C.

[0085] Soft surface layer: single-screw extruder, screw diameter 105mm, aspect ratio 25, compression ratio 3.8:1. The barrel heating zone 1 is 160°C, the second zone is 175°C, the third zone is 173°C, the fourth zone is 177°C, and the fifth zone is 155°C.

[0086] Mold temperature setting:

[0087] The connecting pipe of the hard bottom layer is 155°C, the connecting pipe of the soft surface layer is 160°C, the connector is 160°C, the upper and lower layers o...

Embodiment 3

[0092] The width of the processed and formed double-layer composite soft plastic foam board is 1220 mm, and the thickness is 7 mm, of which the soft layer is 4 mm and the hard layer is 3 mm. The formula is basically the same as the example one. The process is set as follows:

[0093] Hard bottom layer:

[0094] Φ80 / 156mm conical twin-screw extruder with a power of 75 kilowatts.

[0095] The temperature setting is: barrel heating zone 1 190°C, heating zone 2 185°C, heating zone 3 173°C, heating zone 4 167°C, heating zone 5 (merging cone) 155°C, heating zone 6 (connecting pipe) 150°C, The screw oil temperature is 100°C.

[0096] Soft Surface:

[0097] Φ80 / 156mm conical twin-screw extruder with a power of 75 kilowatts.

[0098] The temperature setting is: barrel heating zone 1 190°C, heating zone 2 178°C, heating zone 3 175°C, heating zone 4 170°C, heating zone 5 (merging cone) 165°C, heating zone 6 (connecting pipe) 155°C, The screw oil temperature is 100°C.

[0099] Mold...

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Abstract

The invention relates to a double-layer composite plastic foaming sheet with a soft surface and a formation method thereof and pertains to the field of building materials. The foaming sheet comprises two layers of a soft surface layer and a hard bottom layer, which are both foaming bodies and have the thickness of 2 to 10 mm. The formation method comprises the steps of proportioning, material blending, extrusion by extruders, die formation, pre-cooling, etc., in sequence, and is characterized in that materials of the soft surface layer and the hard bottom layer are first respectively blended to be added into two extruders which are connected with each other by an intermediate connector and a composite die, the step of formation is followed by pre-cooling; wherein, the composite die adopts double runners, a runner of the hard bottom layer is parallel to a composite area at a die orifice while a runner of the soft surface layer forms an angle of 30 to 45 degrees with the runner of the hard bottom layer near the composite area; in addition, the length of a composite straight section of the composite area is 20 to 30 mm. The double-layer composite plastic foaming sheet provided by the invention can ensure more safety with the bottom layer serving for support; the two layers are combined through bonding force and compatibility between molecules of the materials of the two layers and the composite plastic foaming sheet can be formed by a one-off extrusion.

Description

technical field [0001] The invention belongs to the technical field of materials, and its application range is in the building material decoration industry. Background technique [0002] At present, the plastic decorative boards used at home and abroad are almost all hard boards, and most of them are single-layer boards with single performance, no softness and rebound cushioning ability on the surface, and when used as wall panels, they are less protective for personnel. Difference. [0003] The general processing method for single-layer foamed hard board is: use extrusion method. That is: after the material is melted by an extruder, it enters a single-channel flat mold and a sheet auxiliary machine for continuous extrusion. [0004] Common processing methods for single-layer foamed soft boards are: molding and extrusion. The molding method is to use an extruder or calender to continuously extrude the unfoamed board, after cutting, put it in a board-shaped mold for heatin...

Claims

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Application Information

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IPC IPC(8): B32B5/32B29B7/00B29C47/06B29C44/00
Inventor 陈自卫苑会林陈会龙王克俭周志军李晓丹
Owner BEIJING UNIV OF CHEM TECH
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