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Application of polyurethane prepolymer to preparation of wood powder/polrvinyl chloride composite material

A technology of polyurethane prepolymer and polyvinyl chloride, applied in the field of polymer materials

Inactive Publication Date: 2012-05-02
WUHAN QIEN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers added diphenylmethane diisocyanate (MDI) monomer directly into the extruder as a compatibilizer to prepare biomass-based composite materials [12,13]. Although MDI can react with wood flour, but MDI But not necessarily compatible with the selected polymer material continuous phase

Method used

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  • Application of polyurethane prepolymer to preparation of wood powder/polrvinyl chloride composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ratio (NCO / OH) of the number of moles of isocyanate to the number of moles of hydroxyl groups was 2.0. PBA (240 parts) was added to a three-necked flask (500 mL) equipped with a stirrer. The PBA was dried under vacuum in an oil bath at 110°C with stirring. After 30 minutes, the vacuum was removed. After the reaction system was cooled to 70° C., MDI (60 parts) was added within 5 minutes while stirring. After adding MDI for 15 minutes, the system oil bath was kept at 80°C. Subsequently, the system was continuously reacted for 60 minutes under the condition of stirring and vacuuming to obtain a white polyurethane prepolymer, which was named PBAPU. The "parts" in the present invention refer to parts by weight.

Embodiment 2

[0029]The PVC mixture contained PVC (100 parts), stabilizer (3.8 parts), ACR-401 (3.8 parts) and polyethylene wax (0.4 parts). The above PVC mixture (50 parts) and cedar wood powder (50 parts) were mixed together at room temperature with an ordinary mixer to prepare a premix. The premix is ​​fed into the internal mixer, the heating section of the internal mixer is set at 160°C / 160°C / 160°C, and the speed is 100rpm. After 10 minutes the reaction was stopped and material was removed. The composite material after banburying is named WD50PVC50. The pellets were hot-pressed at 170°C for 5 minutes to make tablets and samples, and then subjected to tensile test, impact test and bending test respectively. The mechanical performance data of the test are shown in Table 1.

Embodiment 3

[0031] The formula is changed to: Chinese fir powder, 40 parts; PBAPU prepared by Example 1, 20 parts; the PVC mixture shown in Example 2 is 40 parts, and the processing conditions are the same as in Example 2. The composite material after banburying is called WD40PVC40PBAPU20. The mechanical performance data of the test are shown in Table 1

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Abstract

The invention relates to new application of special polyurethane prepolymer. The polyurethane prepolymer is characterized in that polrvinyl chloride plasticizer is used as a raw material of a soft segment when the prepolymer is synthesized, and the polyurethane prepolymer is used as compatilizer which improves the performance of a wood powder / polrvinyl chloride composite material. The soft segment comprises polyatomic alcohol. The polyatomic alcohol at least comprises polybutylene adipate esterdiol polyol, and polycaprolactone polyol. After the special polyurethane prepolymer is added during processing of the material, the breaking strength and the impact property of the wood powder / polrvinyl chloride composite material are greatly improved. The wood powder / polrvinyl chloride composite material with the high performance is corrosion resistant and waterproof, and can be used as an outdoor building material so as to reduce the using amount of wood.

Description

technical field [0001] The invention relates to a new application of a special type of polyurethane prepolymer, which is used as a compatibilizer to improve the performance of wood flour / polyvinyl chloride composite materials. The particularity of the polyurethane prepolymer lies in the synthesis of the prepolymer The plasticizer of polyvinyl chloride (PVC) is selected as the raw material of the soft segment component during the body. The soft segment component comprises polyols. The polyols include at least two types of polybutylene adipate diol (PBA) polyols and polycaprolactone (PCL) polyols. The invention belongs to the field of polymer materials. technical background [0002] Wood flour is a renewable biomass material with abundant sources, low cost and high environmental friendliness. Rational use of this biomass material for value-added processing is a current research hotspot [1]. A conventional utilization method is to add them to the polyvinyl chloride matrix i...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L27/06C08L75/04C08L75/06C08G18/42
Inventor 伍强贤张宇
Owner WUHAN QIEN SCI & TECH DEV
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