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Flake molding compound for manufacturing manhole cover and preparation method of flake molding compound

A technology of sheet molding compound and manhole cover, which is applied in the field of sheet molding compound, can solve the problems of unsatisfactory mechanical strength, poor material interface bonding, and difference in thermal expansion coefficient, etc., and achieve light weight, stable process and low cost Effect

Inactive Publication Date: 2015-06-10
LINAN JUFENG URBAN SUPPORT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 6) Lower shrinkage
The mechanical strength of BMC material is not very ideal (bending strength is generally 80---120MPa), so only steel bars can be added to increase the load
The addition of steel bars has two major defects in the material: ①The surface of the steel bar is rusty, which often leads to poor bonding of the material interface (if the composite material interface is not well bonded, it will not produce the effect of 1+1>2); ②The steel bar is Metal materials, BMC materials are non-metal materials, the two materials are due to the difference in thermal expansion coefficient

Method used

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  • Flake molding compound for manufacturing manhole cover and preparation method of flake molding compound

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Effect test

Embodiment 1

[0028] In the process of making the manhole cover, the material sheet molding compound used is very important, and its intermediate core material is composed of glass fiber cloth impregnated with resin paste, the content of glass fiber cloth is 20-40 parts, and the resin paste includes the following materials :

[0029] 19-23 parts of unsaturated resin; 6-8 parts of low shrinkage agent; 1.4-1.6 parts of styrene; 0.5-1.5 parts of curing agent; 1.5-1.7 parts of zinc stearate; 0.3 parts; 40-50 parts of heavy calcium carbonate 800-1000 mesh.

[0030] Preferably, the resin paste is made of the following materials: 21 parts of unsaturated resin; 7 parts of low shrinkage agent; 1.5 parts of styrene; 1 part of curing agent; 1.6 parts of zinc stearate; 0.02 parts of benzoquinone; 0.25 parts of pigment paste part; 45 parts of heavy calcium carbonate 800-1000 order, and wherein heavy calcium carbonate is waste material, and the present invention turns waste into wealth, has stronger env...

Embodiment 2

[0034] Such as figure 1 As shown, the technological process of sheet molding compound (SMC) production mainly includes resin paste preparation, pasting operation, infiltration, thickening and other processes. Combined with the preparation method of resin paste, the preparation process of sheet molding compound (SMC) is as follows:

[0035] 1) 19-23 parts of unsaturated resin, 6-8 parts of low shrinkage agent, 1.4-1.6 parts of styrene, 0.5-1.5 parts of curing agent, 1.5-1.7 parts of zinc stearate, 0.01-0.03 parts of benzoquinone, Put 0.2-0.3 parts of the pigment paste into the batching kettle 2, stir for 30-60 minutes and add a thickener, the thickener is 40-50 parts of heavy calcium carbonate 800-1000 mesh;

[0036] 2) After stirring for 60-120 minutes, add magnesium oxide and stir quickly for 20-30 seconds to make a resin paste; the SMC product equipment is equipped with a trough, and the resin paste is immediately poured into the trough; there are 2 sets of film rolls on th...

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Abstract

The invention firstly provides a flake molding compound for manufacturing a manhole cover which is environment-friendly and low in cost. The middle core of the flake molding compound is composed of glass fiber cloth dipped with resin paste, the glass fiber content is 20-40 parts, the resin paste comprises the following materials: 19-23 parts of unsaturated resin, 6-8 parts of low shrinking agent, 1.4-1.6 parts of styrene, 0.5-1.5 parts of curing agent, 1.5-1.7 parts of zinc stearate, 0.01-0.03 part of benzoquinone, 0.2-0.3 part of pigment paste, and 40-50 parts of 800-1000-mesh heavy calcium carbonate. The invention further provides a method for preparing the flake molding compound. The flake molding compound provided by the invention adopts base raw material in low cost, and waste heavy calcium carbonate is adopted, so that the flake molding compound is environmentally friendly and energy-saving. The flake molding compound manufactured by using the method disclosed by the invention is high in technical content, stable in process, low in cost and strong in bearing capacity. The product disclosed by the invention is manufactured as an article which is tight in matching, wear-resistant, corrosion-resistant, light in structure, beautiful in style, light in self weight and easy to install. The social benefit and the economic benefit are obvious.

Description

technical field [0001] The invention relates to a sheet-shaped molding compound, in particular to a sheet-shaped film plastic for making manhole covers; the invention also relates to a preparation method of the sheet-shaped molding compound. Background technique [0002] SMC--sheet molding compound: SMC is the abbreviation of Sheet molding compound, that is, sheet molding compound. The main raw materials are composed of SMC non-alkali yarn, unsaturated resin, low shrinkage additive, filler and various auxiliary agents. SMC has the advantages of superior electrical properties, corrosion resistance, light weight, easy and flexible engineering design, and its mechanical properties can be compared with some metal materials, so it is widely used in transportation vehicles, construction, electronics, electrical, manhole covers and other industries . [0003] Usually, among the SMC materials for making manhole covers, they are generally composed of three categories: synthetic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08K13/04C08K7/14C08K5/098C08K3/26C08L51/08C08L25/06C08L33/12C08L31/04C08L67/02
Inventor 陶坚朱圣光
Owner LINAN JUFENG URBAN SUPPORT EQUIP
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