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Recycled pet type unsaturated polyester molded manhole cover resin and its preparation method and use

A moulded manhole cover, unsaturated technology, applied in the field of organic polymer synthesis, can solve the problems of manhole cover theft, car crash, inconvenience in use, etc. Effect

Active Publication Date: 2016-08-17
浙江天和树脂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cast iron manhole covers have recycling value and are often stolen, resulting in car crashes and deaths from time to time
In order to solve the problem of manhole cover being stolen, two methods are mainly adopted at present: one is to install an anti-theft device on the cast iron manhole cover, but the use of the anti-theft device increases the cost, but cannot fundamentally solve the problem, and brings a lot of inconvenience to the use. Therefore, Seek an effective way to solve the above problems and become a person skilled in the art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Embodiment 1: this resin comprises the component of following percentage by weight:

[0081] Propylene Glycol 3% Diethylene Glycol 24% PET 24% Maleic Anhydride 25%

[0082] Dibutyltin oxide 0.1 % Hydroquinone 0.02% Benzoquinone 0.02% Styrene 23.86%.

[0083] Its preparation method is as follows:

[0084] The first stage: alcoholysis of PET:

[0085] Put 26% of diethylene glycol, 2% of propylene glycol, and 0.05% of dibutyltin oxide into the reaction kettle. After feeding the materials, the temperature rises slowly. A small amount of water will be distilled out without affecting the reaction. The maximum temperature of the material is maintained at 210°C. After 9 hours of reaction, the sample is taken. After the PET is completely dissolved, the material is cooled to 160°C;

[0086] The second stage: esterification of PET after alcohol degradation, monomeric alcohol remaining in the first step and maleic anhydride:

[0087] Add 28% maleic anhydride and 0.02% hydroquin...

Embodiment 2

[0091] Embodiment 2: this resin comprises the component of following percentage by weight:

[0092] Propylene Glycol 3% Diethylene Glycol 22% PET 27% Maleic Anhydride 23%

[0093] Sodium acetate 0.15% Methylhydroquinone 0.01% Hydroquinone 0.01%

[0094] Styrene 24.83%

[0095] Its preparation method is as embodiment 1, wherein:

[0096] In the first stage, the temperature of the control head is 88°C, and the maximum temperature of the material in the reactor is maintained at 210°C for the reaction. After 9 hours of reaction, the sample is taken. After the PET is completely dissolved, the material is cooled to 160°C to obtain the PET after alcoholysis;

[0097] In the second stage, the temperature of the kettle was kept at 170°C for 1 hour. After the heat preservation, the temperature was slowly increased by 5°C / h, and the temperature of the distillation head was controlled at 98°C. After 50mgKOH / g, start vacuuming for 1.5 hours, maintain the material temperature at 204°C, v...

Embodiment 3

[0099] Embodiment 3: this resin comprises the component of following percentage by weight:

[0100] Propylene Glycol 4% Diethylene Glycol 24% PET 27% Maleic Anhydride 22%

[0101] Dibutyltin oxide 0.1 % Methylhydroquinone 0.015% Hydroquinone 0.02% Styrene 22.865%.

[0102] The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention relates to PET recovery type unsaturated polyester mold pressing well lid resin, and a preparation method and application thereof, and belongs to the technical field of organic high-molecular polymer synthesis. PET, maleic anhydride, propylene glycol and diglycol are taken as main raw materials for synthesis, polyester is obtained through esterification of PET obtained after alcoholysis and maleic anhydride, and then the steps of attenuation of the polyester and the like are carried out to obtain the PET recovery type unsaturated polyester mold pressing well lid resin. Through raw material components and dosing amounts and the preparation method, the obtained resin is lowest in cost in synthesis of the same type of unsaturated polyester resin and not bad in the mechanical property, completely meets the requirements on performance and price of the unsaturated polyester resin for a mold pressing well lid, is low in energy consumption and low in production and manufacturing cost, is used for manufacturing unsaturated polyester bulk molding compounds to mold-press municipal facilities such as inspection well lids, water meter lids and electric power cover plates, and has excellent electrical performance, mechanical performance, heat resistance and chemical corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of organic high molecular polymer synthesis, and specifically relates to a recycled PET type unsaturated polyester molded manhole cover resin and its preparation method and application. The unsaturated polyester molded manhole cover resin is specially used for unsaturated polyester glass fiber reinforcement Preparation of bulk molding compound (BMC) and its pressed manhole cover products. Background technique [0002] The manhole cover is the closure on the top of the outlet leading to the underground facilities. It is necessary to install the manhole cover wherever public facilities such as tap water, telecommunications, electricity, gas, heat, fire protection, and sanitation are installed. With the rapid development of my country's economy, my country's infrastructure construction has ushered in a new cycle, and the market demand for manhole covers in urban planning and road construction is huge. Most of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/01C08G63/676
Inventor 林毅陈建朝马勇
Owner 浙江天和树脂有限公司