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High-strength polyester composite well cover as well as formula and preparation method thereof

A high-strength, manhole cover technology, used in water conservancy projects, artificial islands, underwater structures, etc., can solve the problems of short service life, cumbersome inspection manhole covers, poor toughness, etc. strong effect

Inactive Publication Date: 2010-10-27
北京泛亚电通工贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cast iron manhole covers have poor impact resistance, are easy to rust and break, and are often stolen and sold as scrap iron, which seriously threatens the safety of pedestrians and vehicles, and causes economic losses to the country; while reinforced concrete inspection manhole covers are not only bulky but tough Poor, and fragile, low load capacity, short service life
Although the composite manhole cover saves metal materials compared with the cast iron manhole cover, it plays a certain role in preventing theft of the manhole cover; compared with the reinforced concrete manhole cover, the strength of the external pressure load is improved, but due to the complex structure of the composite manhole cover, it is not only bulky and heavy , Inconvenient to use, and because there is a strong steel bar in the middle of the manhole cover, it cannot completely prevent theft

Method used

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  • High-strength polyester composite well cover as well as formula and preparation method thereof
  • High-strength polyester composite well cover as well as formula and preparation method thereof
  • High-strength polyester composite well cover as well as formula and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh raw materials (kg) according to the following weights:

[0033] Unsaturated polyester resin 21.65, low shrinkage additive 8.25, heavy calcium carbonate 37.9, zinc stearate 1.04, active magnesium oxide 0.52, curing agent 0.12, carbon black 0.52, alkali-free glass fiber roving 15, glass fiber twist Roving 15.

[0034] The above raw materials are selected from the following models and manufacturers:

[0035] 1) Unsaturated polyester resin: the model is HR-8309C, and the manufacturer is preferably Changzhou Huarun Composite Materials Co., Ltd.;

[0036] 2) Low-shrinkage additive: the model is HR-8987, and the manufacturer chooses Changzhou Huarun Composite Materials Co., Ltd.;

[0037] 3), heavy calcium carbonate: 400 mesh, the manufacturer is preferably Beijing Taiping Chemical Factory;

[0038] 4) Zinc stearate: Zinc content 10%, the manufacturer prefers Shijiazhuang Mingxin Plastic Auxiliary Factory;

[0039] 5), active magnesium oxide: MgO≥95%, the manufacture...

Embodiment 2

[0070] Weigh raw materials (kg) according to the following weights:

[0071] Unsaturated polyester resin 25, low shrinkage additive 10, heavy calcium carbonate 55, zinc stearate 1.2, active magnesium oxide 0.6, curing agent 0.15, carbon black 0.6, alkali-free glass fiber roving 20, glass fiber twist Roving cloth5.

[0072] The above raw materials are selected from the following models:

[0073] 1) Unsaturated polyester resin: the model is HR-8902;

[0074] 2), low shrinkage additive: model HR-8892;

[0075] 3), heavy calcium carbonate: 800 mesh

[0076] 4), zinc stearate: zinc content 13%;

[0077] 5), active magnesium oxide: MgO≥93%;

[0078] 6), curing agent: tert-butyl benzoyl peroxide;

[0079] 7), carbon black: 800 mesh;

[0080] 8), E-glass fiber roving: ERS240-T949R;

[0081] 9), glass fiber roving: EWR580-100;

[0082] Packaging accessories: PE film specification, 1100CMx50UM, to be removed when molding

[0083] The method for preparing manhole cover: compris...

Embodiment 3

[0098] Weigh raw materials (kg) according to the following weights:

[0099] Unsaturated polyester resin 20, low shrinkage additive 8, heavy calcium carbonate 50, zinc stearate 1, activated magnesium oxide 0.5, curing agent 0.1, carbon black 0.5, alkali-free glass fiber roving 15, glass fiber twist Roving 10.

[0100] The above raw materials are selected from the following models:

[0101] 1), unsaturated polyester resin: model is or HR-8902;

[0102] 2), low shrinkage additive: model HR-8987;

[0103] 3), heavy calcium carbonate: 400 mesh;

[0104] 4), zinc stearate: zinc content 13%;

[0105] 5), active magnesium oxide: MgO≥93%);

[0106]6), curing agent: tert-butyl peroxybenzoate;

[0107] 7), carbon black: 800 mesh;

[0108] 8), E-glass fiber roving: ERS240-T949M;

[0109] 9), glass fiber roving: EWR600-75;

[0110] Packaging accessories: PE film 80CMx50UM.

[0111] The preparation method is as in Example 1.

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Abstract

The invention discloses a formula of a high-strength polyester composite well cover, which comprises the following raw materials in parts by weight: 21-22 parts of unsaturated polyester resin, 8-9 parts of low shrink additive, 40-50 parts of heavy calcium carbonate, 1-1.5 parts of zinc stearate, 0.2-0.8 part of active magnesia, 0.12-0.28 part of curing agent, 0.2-0.8 part of carbon black, 10-20 parts of alkali-free glass fiber roving and 10-20 parts of glass fiber woven roving. A production method of the well cover of the invention comprises the following steps of: firstly preparing resin paste, preparing sheets by utilizing the resin paste, and then, forming the sheets by die pressing. The well cover of the invention has the characteristics of strong carrying capacity, shock resistance, ageing resistance, wear resistance, corrosion resistance, novel and attractive appearance, simple structure, environmental protection and the like, and basically solves the problem of well cover pilfering.

Description

technical field [0001] The invention relates to a formula for a manhole cover and a preparation method thereof, in particular to a high-strength polyester composite manhole cover, the formula and a preparation method for the manhole cover. Background technique [0002] The inspection manhole covers used in urban construction facilities such as electric power, communication, and municipal engineering in the prior art generally adopt cast iron or reinforced concrete to make, and composite manhole covers have appeared subsequently, as the Chinese patent, the patent number is: CN200520049778.8, and the invention name is " high The utility model patent of "Strength Composite Manhole Cover" discloses that a manhole cover product is made of composite materials. It is the surface felt resin glue layer, and the quartz sand glass fiber layer is set in the resin glue layer. The center of the middle layer is the filling material, and the ribbed steel structure is laid. The twisted yarn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/14C04B26/18C04B14/42C04B14/28
Inventor 郭晓明刘德坤冯玉良李洪涛
Owner 北京泛亚电通工贸有限责任公司
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