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Improved crosslinked polyvinyl chloride structural foam and preparation method thereof

A technology for cross-linking polyvinyl chloride and polyvinyl chloride resin, which is applied in the field of cross-linking polyvinyl chloride structural foam and its preparation, can solve the problems of reducing the acidity of the reaction environment, increasing the difficulty of process control, limiting the control range of process parameters, and the like. The effect of simple manufacturing process control, shortened process time, and wide parameter operating range

Active Publication Date: 2012-01-25
CHANGZHOU TIANSHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selection of specific polyvinyl chloride resin and acid anhydride also reduces the acidity of the reaction environment, increases the difficulty of process control, and limits the control range of process parameters (temperature, time)

Method used

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  • Improved crosslinked polyvinyl chloride structural foam and preparation method thereof
  • Improved crosslinked polyvinyl chloride structural foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The mixture contains 100 kg of polyvinyl chloride, 66 kg of liquefied diphenylmethane-4,4'-diisocyanate, 12.6 kg of polymethylene polyphenyl polyisocyanate, 1.6 kg of epoxidized soybean oil, and azobisisobutyronitrile 7.0 kg, 1.8 kg of azodicarbonamide, 3.0 kg of melamine, 20.6 kg of methyl hexahydrophthalic anhydride, and 1.2 kg of surfactant. Stir and mix in a mixer until uniform to obtain a paste mixture with a certain viscosity.

[0048] Pour the product into a steel mold with a thickness of 28mm to fill the mold. It is placed between the press plates at 175°C and heated at a pressure of 14MPa. The mixture was cooled to room temperature under pressure and removed to give a cooled semi-foamed molding.

[0049] Next, place the semi-foamed molded object in a steam oven to expand for 6 hours, and the steam temperature is 93°C±2°C. After cooling, solidify and post-treat in a steam oven at 65°C for 5 days to fully react the isocyanate, thereby obtaining a rigid foam pr...

Embodiment 2

[0051] The mixture contains 100 kg of polyvinyl chloride, 88 kg of liquefied diphenylmethane-4,4'-diisocyanate, 8.6 kg of polymethylene polyphenyl polyisocyanate, 1.0 kg of epoxidized soybean oil, and azobisisobutyronitrile 8.2 kg, 1.1 kg of azodicarbonamide, 5 kg of melamine, 10 kg of methyl hexahydrophthalic anhydride, and 2.1 kg of surfactant. Stir and mix in a mixer until uniform to obtain a paste mixture with a certain viscosity.

[0052] Pour the product into a steel mold with a thickness of 28mm to fill the mold. Place it into a press plate at 175° C. and heat it at a pressure of 15 MPa. The mixture was cooled to room temperature under pressure and removed to give a cooled semi-foamed molding.

[0053] Next, place the semi-foamed molded object in a steam oven to expand for 6 hours, and the steam temperature is 96°C±2°C. After cooling, spray and solidify with hot water at 65°C for 5 days to fully react the isocyanate, thereby obtaining a rigid foam product with a dens...

Embodiment 3

[0055] The mixture contains 100 kg of polyvinyl chloride, 30 kg of polymethylene polyphenyl polyisocyanate, 29 kg of liquefied diphenylmethane diisocyanate, 1.5 kg of epoxy soybean oil, 6.6 kg of azobisisobutyronitrile, azobis Formamide 1.5 kg, melamine 3.0 kg, phthalic anhydride 19.4 kg. Stir and mix in a mixer until uniform to obtain a paste mixture with a certain viscosity.

[0056] Pour the product into an aluminum mold with a thickness of 28mm, filling the mold. It is placed between the press plates at 165°C and heated at a pressure of 12MPa. The mixture was cooled to room temperature under pressure and removed to give a cooled semi-foamed molding.

[0057] Next, place the semi-foamed molded object in a steam oven for expansion for 4 hours, and the steam temperature is 97°C±2°C. After cooling, solidify and post-treat in a steam oven at 60°C for 9 days to fully react the isocyanate, thereby obtaining a rigid foam product with a density of 61kg / m 3 . Its mechanical pro...

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Abstract

The invention relates to improved crosslinked polyvinyl chloride structural foam and a preparation method thereof. The foam is prepared from the following materials in portion by weight: 100 portions of polyvinyl chloride resin, 30 to 120 portions of isocyanate, 0.05 to 10 portions of epoxy components, 1 to 12 portions of foaming agent, 0.5 to 10 portions of triazine compound, and 1 to 30 portionsof acid anhydride. The preparation method thereof comprises the following steps: (1) mixing the raw materials evenly to obtain a pasty mixture; (2) pouring the pasty mixture obtained in step (1) intoa die, and fully decomposing the foaming agent to obtain a semi-foaming die pressing block; (3) cooling the semi-foaming die pressing block to room temperature; (4) placing the semi-foaming die pressing block obtained in step (3) into hot bath or steam to carry out swelling; and (5) cooling a swelled semi-finished product obtained in step (4) to room temperature, and then adopting hot water sprayor curing post treatment in the steam to fully react the isocyanate so as to obtain cured block or plate crosslinked polyvinyl chloride structural foam. The foam has fine and even holes, and has goodmechanical property and temperature resistance.

Description

technical field [0001] The invention relates to an improved cross-linked PVC structural foam (cross-linked PVC structural foam) with fine and uniform cells and excellent mechanical properties and a preparation method thereof. Background technique [0002] Cross-linked rigid polyvinyl chloride foam has good static and dynamic compressive strength, impact strength, stiffness, dimensional stability and high fracture resistance, and is widely used in wind energy, yachts, sports equipment, railway locomotives and aerospace, etc. In composite elements in sandwich applications. [0003] Patent WO 2005 / 092958 discloses an initial raw material formula and preparation method for preparing cross-linked polyvinyl chloride rigid foam. There are 3%-15% epoxy components in the formula as stabilizers and tougheners, too much The addition of the epoxy component prolongs the curing time. Patent WO 2007 / 141647 discloses an improved initial raw material formula and preparation method of rigid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/58C08G101/00
Inventor 朱文强贲进王健吴海宙
Owner CHANGZHOU TIANSHENG NEW MATERIALS CO LTD
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