Black low-flow-mark polyester molding compound and preparation method thereof

A molding compound and black technology, which is applied in the field of polyester molding compound and its preparation, can solve the problems of whitening and blooming, and the inability to obtain uniform and uniform colored products, etc., and achieve the effect of long shelf life

Inactive Publication Date: 2012-07-11
上海耀华大中新材料有限公司
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of material cannot produce uniform colored products, especially black products. Even if a large amount of black pigment is added, the surface will still appear white and grayish black when viewed with the naked eye.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Black low-flow-mark polyester molding compound and preparation method thereof
  • Black low-flow-mark polyester molding compound and preparation method thereof
  • Black low-flow-mark polyester molding compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Black low ripple polyester molding compound, blended from the following raw materials in weight percentages:

[0039] Resin paste 68%;

[0040] E-chopped glass fiber 32%;

[0041] The resin paste is composed of the following raw materials in parts by weight: 50 parts of o-phthalic unsaturated polyester resin, 50 parts of NP2000 from ASHLAND Ashland, USA, 1.2 parts of tert-butyl benzoyl peroxide, 190 meshes of zinc stearate powder 2 parts, 150 parts of 300 mesh calcium carbonate, 0.8 part of magnesium oxide.

[0042] The method for preparing the above-mentioned black low-ripple polyester molding compound comprises the following steps in turn:

[0043] (1) Weigh the ortho-phthalic unsaturated polyester resin and NP2000 from American ASHLAND Ashland Company according to the formula weight, pour it into the barrel, and stir it at high speed at 1000 rpm for 4-5 minutes

[0044] (2) Add 2 parts of benzoyl peroxide tert-butyl peroxide and 190-mesh zinc stearate powder in th...

Embodiment 2

[0052] Black low ripple polyester molding compound, blended from the following raw materials in weight percentages:

[0053] Resin paste 73%;

[0054] E-chopped glass fiber 27%;

[0055] The resin paste is composed of the following raw materials in parts by weight: 65 parts of m-phenylene unsaturated polyester resin, 35 parts of NP2000 from American ASHLAND Ashland Corporation, 1.5 parts of benzoyl tert-butyl peroxide, 200 meshes of zinc stearate powder 2 parts, 5 parts of styrene, 200 parts of 400 mesh calcium carbonate, 0.8 parts of magnesium oxide.

[0056] The method for preparing the above-mentioned black low-ripple polyester molding compound comprises the following steps in turn:

[0057] (1) Weigh m-phenylene unsaturated polyester resin and NP2000 from American ASHLAND Ashland Company according to the formula weight, pour it into the barrel, and stir it at high speed at 1000 rpm for 4-5 minutes

[0058] (2) Add tert-butyl benzoyl peroxide, styrene, and 200 mesh zinc ...

Embodiment 3

[0065] Black low ripple polyester molding compound, blended from the following raw materials in weight percentages:

[0066] Resin paste 78%;

[0067] E-chopped glass fiber 22%;

[0068] The resin paste is composed of the following raw materials in parts by weight: 65 parts of vinyl unsaturated polyester resin, 35 parts of NP2000 from ASHLAND Ashland Corporation of the United States, 1.5 parts of benzoyl tert-butyl peroxide, 210 mesh zinc stearate powder 4 parts, 5 parts of styrene, 200 parts of 500 mesh calcium carbonate, 0.8 parts of magnesium oxide.

[0069] The method for preparing the above-mentioned black low-ripple polyester molding compound comprises the following steps in turn:

[0070] (1) Weigh vinyl unsaturated polyester resin and NP2000 from American ASHLAND Ashland Company according to the formula weight, pour it into the bucket, and stir it at high speed at 1000 rpm for 4-5 minutes

[0071] (2) Add benzoyl tert-butyl peroxide, styrene, and 210 mesh zinc stear...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
lengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a black low-flow-mark polyester molding compound which is prepared from mixed materials of, by weight: 65-80% of resin paste and 20-35% of alkali-free short chopped fiberglass. The resin paste is composed of raw materials of, by weight: 50-70 parts of unsaturated polyester resin, 30-50 parts of a black polyvinyl acetate solution, 1-1.5 parts of a curing agent, 2-4 parts of a mold release agent, 150-200 parts of a filling material, and 0.8-1.2 parts of a thickening agent. According to the invention, a low-shrinkage agent solution is prepared from polyvinyl acetate with a black body, such a shrinkage is lower than 0.05%. More importantly, the color of the molding compound is realized by the black color of polyvinyl acetate rather than by adding a black pigment. Therefore, non-uniform color due to pigment agglomeration caused by phase separation is avoided. Also, no black pigment is adopted in the formula, such that an inductive effect of a black pigment upon the curing agent is avoided, and the polyester molding compound provided by the invention has a longer storage life than other black polyester molding compounds.

Description

technical field [0001] The invention relates to a polyester molding compound and a preparation method thereof, in particular to a black low-ripple polyester molding compound and a preparation method thereof. Background technique [0002] From the perspective of shrinkage, polyester molding compounds can be divided into two types: low shrinkage and low ripple (or low profile). The former often uses polystyrene as a low shrinkage agent, and the shrinkage rate of the technetium molding compound is greater than 0.05%, which cannot meet the strict tolerance requirements of the size, and also has warping, ribs, and obvious sink marks on the back of the boss. . [0003] Polyvinyl acetate or saturated polyester is used as a low shrinkage agent for low-ripple polyester molding compounds, and the shrinkage rate is less than 0.05%, which can solve the above problems. But this kind of material can't get the coloring product of uniform color, especially black product, even if add a lar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/06C08L31/04C08K13/04C08K7/14C08K3/26C08K3/22C08K5/14
Inventor 王麒张王根吴佳骏
Owner 上海耀华大中新材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap