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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: 2014-01-29
上海耀华大中新材料有限公司
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  • 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

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  • 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-corrugation polyester molding compound, mixed with the following raw materials in weight percentage:

[0039] Resin paste 68%;

[0040] Alkali-free chopped glass fiber 32%;

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

[0042] The method for preparing the black low-corrugation polyester molding compound includes the following steps in sequence:

[0043] (1) Weigh the o-phthalic unsaturated polyester resin and the NP2000 of Ashland Company in the United States according to the weight of the formula, pour it into the bucket, and stir at 1000 rpm for 4-5 minutes at high speed

[0044] (2) Add formula amount of tert-butyl benzoyl peroxide and 2 parts of 190 mesh zinc stearate powder, an...

Embodiment 2

[0052] Black low-corrugation polyester molding compound, mixed with the following raw materials in weight percentage:

[0053] Resin paste 73%;

[0054] Alkali-free chopped glass fiber 27%;

[0055] The resin paste is composed of the following raw materials in parts by weight: 65 parts of isophthalic unsaturated polyester resin, 35 parts of NP2000 from ASHLAND, USA, 1.5 parts of tert-butyl benzoyl peroxide, and 200 mesh 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 black low-corrugation polyester molding compound includes the following steps in sequence:

[0057] (1) Weigh the isophthalic unsaturated polyester resin and the NP2000 of Ashland Company of the United States according to the weight of the formula, pour into the bucket, and stir at 1000 rpm for 4-5 minutes at high speed

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

Embodiment 3

[0065] Black low-corrugation polyester molding compound, mixed with the following raw materials in weight percentage:

[0066] Resin paste 78%;

[0067] Alkali-free 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, USA, 1.5 parts of tert-butyl benzoyl peroxide, and 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 black low-corrugation polyester molding compound includes the following steps in sequence:

[0070] (1) Weigh the ethylenically unsaturated polyester resin and the NP2000 of Ashland Company in the United States according to the weight of the formula, pour into the bucket, and stir at 1000 rpm for 4-5 minutes at high speed

[0071] (2) Add formula amount of tert-butyl benzoyl peroxide, styrene, 210 mesh zinc stearate powd...

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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-corrugated polyester molding compound and a preparation method thereof. Background technique [0002] From the perspective of shrinkage rate, polyester molding compounds can be divided into low shrinkage and low corrugation (or low profile). The former often uses polystyrene as a low shrinkage agent. The shrinkage rate of the technetium molding compound is greater than 0.05%, which cannot meet the strict tolerance requirements of the product. At the same time, it will also have warpage, ribs and obvious sink marks on the back of the boss. . [0003] The low-corrugation polyester molding compound uses polyvinyl acetate or saturated polyester as the low shrinkage agent, and the shrinkage rate is less than 0.05%, which can solve the above problems. However, this kind of material cannot obtain colored products with uniform colors, especially blac...

Claims

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Application Information

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Patent Type & Authority Patents(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
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