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Modified calcium carbonate, polymer composition containing the same and process for producing them

A calcium carbonate and polymer technology, applied in the direction of calcium carbonate/strontium/barium, fibrous fillers, etc., can solve the problems of inability to combine, poor tensile strength, tear strength, wear resistance, inability to impart tensile stress, tensile strength, etc. Tensile strength, tear strength, wear resistance and other mechanical properties

Inactive Publication Date: 2005-09-14
SHIRAISHI KOGYO KAISHA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when calcium carbonate is used as a polymer reinforcing filler, it cannot impart mechanical properties such as tensile stress, tensile strength, tear strength, and abrasion resistance equivalent to polymers compounded with wet silica.
[0004] In addition, the problem of calcium carbonate surface-treated with a substance having a reactive functional group such as thiol or amine is that although the hardness and the tensile stress at low elongation are large, compared with wet silica, the tensile stress is Physical properties such as strength, tear strength, and wear resistance are poor
[0009] However, when using silica hydrosol to treat sub-micron calcium carbonate, when dry, silica hydrosol will strongly coagulate and solidify calcium carbonate, resulting in coarse particles, making it difficult to separate the aggregated particles
However, when using a polymer with both COOH and OH groups, the alkyl chain as the backbone may completely cover the OH group, and cannot fully combine with the silane coupling agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Fully agitate the BET surface area of ​​80m 2 / g synthetic calcium carbonate slurry (solid content 8%), while heating to 40°C. Taking the synthetic calcium carbonate in the slurry as 100 parts by weight, add 3% sodium silicate aqueous solution at room temperature to make the silicon dioxide 7 parts by weight, and introduce the 3.5% dilute hydrochloric acid aqueous solution needed to neutralize the sodium silicate , A layer of silica is formed on the surface of calcium carbonate.

[0125] Then, 5 parts by weight of the fatty acid mixture saponified by adding sodium hydroxide and heating and stirring at 90°C was added to form fatty acid sodium, which was then dehydrated with a filter press and dried at 80°C using a box dryer. The obtained dried product was pulverized with a fine powder mill (manufactured by Hosokawa Micron, an ultrafine mill) to prepare calcium carbonate powder having a silica layer and an organic acid layer.

[0126] The calcium carbonate powder was stirred ...

Embodiment 2

[0130] Except for using BET specific surface area of ​​40m 2 / g of synthetic calcium carbonate slurry, 5 parts by weight of 3% sodium silicate aqueous solution based on silica, 2.5 parts by weight of mixed fatty acid, and other operations as in Example 1 to obtain the modified carbonic acid of the present invention calcium.

[0131] The adhesion amounts of the silica layer, the organic acid layer and the silane coupling agent layer per 100 parts by weight of the raw calcium carbonate in the obtained modified calcium carbonate are shown in Table 1.

[0132] As in Example 1, 100 parts by weight of synthetic rubber (styrene-butadiene rubber (SBR), 1502) were mixed with 100 parts by weight of the modified calcium carbonate obtained above to prepare a polymer composition.

Embodiment 3

[0134] Fully agitate the BET surface area of ​​80m 2 / g synthetic calcium carbonate slurry (solid content 8%), while heating to 40°C. Taking the synthetic calcium carbonate in the slurry as 100 parts by weight, add 3% sodium silicate aqueous solution at room temperature to make the silicon dioxide 7 parts by weight, and introduce the 3.5% dilute hydrochloric acid aqueous solution needed to neutralize the sodium silicate , A layer of silica is formed on the surface of calcium carbonate. After adding 5 parts by weight of the fatty acid mixture to the obtained calcium carbonate slurry provided with a silica layer, it was dehydrated, dried, and pulverized in the same manner as in Example 1 to prepare calcium carbonate powder having a silica layer and an organic acid layer.

[0135] According to the same method as in Example 1, with respect to 100 parts by weight of rubber, the calcium carbonate having a silica layer and an organic acid layer obtained by the above method was blended in...

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Abstract

A modified calcium carbonate comprising calcium carbonate as a raw material and, superimposed on the surface thereof, (i) a silica layer, (ii) an organic acid layer constituted of at least one member selected from the group consisting of fatty acids, fatty acid salts, fatty acid esters, resin acids, resin acid salts and resin acid esters and (iii) a layer of silane coupling agent; and a polymer composition comprising the modified calcium carbonate.

Description

Technical field [0001] The present invention relates to a modified calcium carbonate that can be effectively used as a reinforcing filler for polymers such as rubber and plastics, a polymer composition containing the modified calcium carbonate, and a method for producing the same. Background technique [0002] At present, white carbon black (such as wet silica) is widely used as a reinforcing filler for polymer products that require high strength and high hardness. However, since wet silica is an acidic filler, when it is directly blended with a polymer, the vulcanization is slow. Therefore, it is necessary to add an active agent such as polyethylene glycol. In addition, wet silica has disadvantages in physical properties. For example, when it is compounded with rubber, it has poor permanent elongation. In addition, wet silica increases the viscosity of unvulcanized rubber in terms of processability, and causes problems in roll crimping properties. [0003] Since calcium carbonat...

Claims

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Application Information

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IPC IPC(8): C08K9/02C08K9/04C08K9/06C09C1/02
CPCC09C1/024C08K9/02C01P2006/12C08K9/06C08K9/04C09C1/021C01F11/18C09C1/02
Inventor 筒井昌一石田博嗣细井和幸
Owner SHIRAISHI KOGYO KAISHA LTD
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