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Application of low-ammonia or zero-ammonia latex in natural latex foamed product

A foamed product and latex technology, applied in the field of rubber products, can solve the problems of low tensile strength, low elongation at break, large compression set, uneven cell size, etc., and achieves low elongation at break and permanent compression. The effect of large deformation and uniform cell size

Active Publication Date: 2019-07-12
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing sponge products also have non-uniform cell size, rough pore structure, product delamination, internal defects and other factors, which lead to large compression permanent deformation, low tensile strength and elongation at break, and poor rebound unsatisfactory rate problem

Method used

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  • Application of low-ammonia or zero-ammonia latex in natural latex foamed product
  • Application of low-ammonia or zero-ammonia latex in natural latex foamed product

Examples

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preparation example Construction

[0061] Second aspect of the present invention provides the preparation method of above-mentioned natural rubber latex foam product, comprises the steps:

[0062] 1) Latex compounding: Stir and mix the latex, additives, and vulcanizing agents in the formulated amount for 30 minutes to obtain the compounded latex for later use;

[0063] 2) Mechanical air bubbles: add the fillers and foaming agents in the formulated amount to the compound rubber and mix them, and stir the air bubbles in the mechanical foaming machine at a speed of 100-150r / min for 10-15 minutes, then reduce the speed Soak at 50-60r / min for 3-5 minutes; then add active agent and stir for 1-3 minutes, add gelling agent and stir for 3-5 minutes to obtain foam rubber;

[0064] 3) Film injection of foam rubber: inject the foam rubber into the mold, and shape it at 95-105°C;

[0065] 4) Vulcanization: Vulcanize the shaped prototype together with the model at a temperature of 90-110°C for 10-30 minutes;

[0066] 5) Po...

Embodiment 1

[0068] Embodiment 1 provides a kind of natural rubber latex foaming product, and its preparation raw material, by weight, comprises latex 100, vulcanizing agent 2, foaming agent 0.5, gelling agent 0.5, active agent 3, auxiliary agent 3, filler 20 .

[0069] Described latex is natural rubber latex; Described vulcanizing agent is sulfur; Described gelling agent is sodium silicon fluoride; Described active agent is made up of the zinc oxide of the stearic acid of 1 weight part and 3 weight parts; By the vulcanization accelerator of 7 parts by weight, the antioxidant of 10 parts by weight, the casein of 1 weight part, the potassium hydroxide of 0.1 weight part, the soft water of 40 parts by weight; Described vulcanization accelerator is made of the accelerator PPP of 0.75 parts by weight And the promotor MZ composition of 1 weight part; Described filler is the talcum powder and calcium carbonate of equal weight; Described foaming agent is made up of the foaming agent of 0.3 weight...

Embodiment 2

[0079] Embodiment 2 provides a kind of natural latex foaming product, and its preparation raw material, by weight, comprises latex 100, vulcanizing agent 3, foaming agent 3, gelling agent 1.5, active agent 5, auxiliary agent 12, filler 100 .

[0080] Described latex is the natural rubber latex song butadiene latex of equal weight; Described vulcanizing agent is sulfur; Described gelling agent is sodium silicofluoride; Described active agent is by the stearic acid of 1 weight part and the oxidized Zinc composition; Described auxiliary agent is by the vulcanization accelerator of 15 weight parts, the anti-aging agent of 18 weight parts, the casein of 5 weight parts, the potassium hydroxide of 0.4 weight part, the demineralized water of 55 weight parts; Described whipping agent consists of Foaming agent and foam stabilizer are composed, and the weight ratio is 3: 2, and foaming agent is sodium lauryl alcohol sulfate, and foam stabilizer is cetyltrimethylammonium bromide; Describe...

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Abstract

The invention relates to the field of rubber products, and concretely relates to an application of low-ammonia or zero-ammonia latex in a natural latex foamed product. The invention also provides thenatural latex foamed product. The natural latex foamed product is prepared from, by weight, 100 parts of the latex, 2-3 parts of a vulcanizing agent, 0.5-3 parts of a foaming agent, 0.5-1.5 parts of agelling agent, 3-5 parts of an activator, 3-12 parts of an assistant and 20-100 parts of a filler. The natural latex foamed product has the advantages of excellent foam stability, uniform cell size,structured and stable hole structure and few internal defects, and produced sponge products have the advantages of large permanent compression set, low tensile strength, low elongation at break, and significantly improved resilience rate.

Description

technical field [0001] The invention relates to the field of rubber products, in particular to the application of low-ammonia or ammonia-free latex in natural latex foam products. Background technique [0002] Natural rubber is mainly natural rubber latex collected from Hevea brasiliensis, and it is an elastic solid made by coagulation, drying and other processing procedures. Its rubber hydrocarbon (polyisoprene) content is more than 90%, and also contains a small amount of protein, fatty acid, sugar and ash. Natural rubber has high elasticity, high strength, wear resistance, tear resistance, acid and alkali resistance, corrosion resistance, excellent insulation, flexibility and other properties, and is widely used in industry and agriculture, national defense, transportation, transportation, machinery manufacturing, medicine In the field of health and daily life, it is irreplaceable by other materials. At present, NH3 (0.25%)+TT / ZnO and high NH3 (0.7%) are commonly used i...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L89/00C08K13/02C08K3/22C08K5/09C08K3/34C08K3/26C08K5/19C08J9/30
CPCC08J9/30C08J9/0061C08J9/0095C08J9/0066C08J9/0071C08J9/0023C08J9/0028C08J2307/02C08J2489/00
Inventor 桂红星宋亚忠赵立广李建伟丁丽黄红海王岳坤
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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