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Preparation method for colored natural latex tube with bi-color cross section

A technology of natural latex and cross-section, applied in the field of natural latex tubes, can solve the problems of difficulty in preparing thick-walled color natural latex tubes, reduced production efficiency by heat-sensitive extrusion method, low extrusion efficiency and quality qualification rate, etc. The effect of preparation cost, increase of enterprise economic benefit, and improvement of quality pass rate

Active Publication Date: 2020-08-18
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional heat-sensitive extrusion method to prepare natural latex tubes has been used since 1930. However, when preparing monochrome large-scale color natural latex tubes with an inner diameter of ≥6mm and an outer diameter of ≥12mm, due to the influence of the pigment dispersion on the heat-sensitive extrusion process Larger, the single-color natural latex tube of the same specification has a lower quality pass rate of more than 10% than the natural color natural latex tube, and with the increase of the inner and outer diameters, the production efficiency of the thermal extrusion method tends to decrease, and the appearance quality is defective There is an increasing trend, and thick-walled colored natural latex tubes with a wall thickness ≥ 5.5mm, such as 7mm×18mm, are difficult to prepare by thermal extrusion
[0003] Large-scale or thick-walled colored natural latex tubes have excellent 300% constant elongation performance while maintaining excellent elasticity and stretching ratio, and are more suitable for the assembly requirements of strength training and fitness equipment. The existing technology uses heat-sensitive extrusion method When preparing large-scale colored natural latex tubes with an inner diameter of ≥6mm and an outer diameter of ≥12mm, there are problems of low extrusion efficiency and quality pass rate, and it is difficult to prepare thick-walled colored natural latex tubes with a tube wall thickness of ≥5.5mm
In addition, high-quality pigment dispersions are usually expensive, resulting in high economic costs

Method used

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  • Preparation method for colored natural latex tube with bi-color cross section
  • Preparation method for colored natural latex tube with bi-color cross section
  • Preparation method for colored natural latex tube with bi-color cross section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A kind of circular dipping method prepares the method for the natural latex tube (6mm * 13mm) of cross-section two-color, outer surface red, comprises the following steps:

[0064] (1) preparation solid content is the mixing dispersion of 50wt%:

[0065]

[0066] Put the above materials into a ball mill with a rotating speed of 80 rpm to grind for 60 h, and filter through a stainless steel screen with a pore size of 0.28 mm to obtain a mixed dispersion with a solid content of 50 wt%.

[0067] (2) preparation solid content is the vulcanization latex of 55wt%:

[0068]

[0069]

[0070] Put the concentrated latex in the latex vulcanization tank, add the stabilizer Pingping and O under stirring conditions, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 40°C, add the mixed dispersion, 45wt% MG49 Tianjia Latex, 28wt% epoxidized natural latex, 50wt% water-based ultrafine calcium carbonate and deionized wat...

Embodiment 2

[0087] A kind of circular dipping method prepares the method for the natural latex tube (7mm * 15mm) of cross-section two-color, outer surface green, comprises the following steps:

[0088] (1) preparation solid content is the mixing dispersion of 50wt%:

[0089]

[0090] Put the above materials into a ball mill with a rotating speed of 80 rpm to grind for 60 h, and filter through a stainless steel screen with a pore size of 0.28 mm to obtain a mixed dispersion with a solid content of 50 wt%.

[0091] (2) preparation solid content is the vulcanization latex of 55wt%:

[0092]

[0093]

[0094] Put the concentrated latex in the latex vulcanization tank, add the stabilizer Pingping and O under stirring conditions, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 40°C, add the mixed dispersion, 45wt% MG49 Tianjia Latex, 28wt% epoxidized natural latex, 50wt% water-based ultrafine calcium carbonate and deionized w...

Embodiment 3

[0111] A kind of circulation dipping method prepares the method for the natural latex tube (7mm * 16mm) of cross-section two-color, outer surface black, comprises the following steps:

[0112] (1) preparation solid content is the mixing dispersion of 50wt%:

[0113]

[0114] Put the above materials into a ball mill with a rotating speed of 80 rpm to grind for 60 h, and filter through a stainless steel screen with a pore size of 0.28 mm to obtain a mixed dispersion with a solid content of 50 wt%.

[0115] (2) preparation solid content is the vulcanized latex of 55wt%:

[0116]

[0117]

[0118] Put the concentrated latex in the latex vulcanization tank, add the stabilizer Pingping and O under stirring conditions, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 38°C, add the mixed dispersion, 45wt% MG49 Tianjia Latex, 28wt% epoxidized natural latex, 50wt% water-based ultrafine calcium carbonate and deionized w...

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Abstract

The invention discloses a preparation method for a colored natural latex tube with a bi-color cross section, and belongs to the technical field of natural latex tubes. According to the preparation method for the colored natural latex tube with the bi-color cross section, the large-specification and thick-wall colored natural latex tube with the bi-color cross section and having an inner diameter of not less than 6mm, an outer diameter of not less than 12mm and a tube wall thickness of not less than 5.5mm is prepared through the steps of preparing a mixed dispersoid, vulcanized latex, an inner-layer heat-sensitive latex and an outer-layer heat-sensitive latex, impregnating the inner-layer heat-sensitive latex and the outer-layer heat-sensitive latex, and carrying out die release, surface treatment and final drying. The obtained product is high in quality qualification rate, and stable in quality level, and the problems that a large-specification single-color colored natural latex tube prepared through an existing thermosensitive pressure extrusion method is low in extrusion efficiency and quality qualification rate, and a thick-wall colored natural latex tube which has a tube wall thickness of not less than 5.5mm is difficulty prepared, are solved; and meanwhile, the consumption amount for a pigment dispersion solution with a high price is reduced by controlling the thickness ofan outer-layer colored latex film of the latex tube to be 0.48mm-0.50mm, so that the preparation cost is saved.

Description

technical field [0001] The invention relates to the technical field of natural latex tubes, in particular to a method for preparing a cross-section two-color colored natural latex tube. Background technique [0002] Natural latex tubes are often used in medical aids, experimental equipment connections, and fitness equipment assembly. The traditional heat-sensitive extrusion method to prepare natural latex tubes has been used since 1930. However, when preparing monochrome large-scale color natural latex tubes with an inner diameter of ≥6mm and an outer diameter of ≥12mm, due to the influence of the pigment dispersion on the heat-sensitive extrusion process Larger, the single-color natural latex tube of the same specification has a lower quality pass rate of more than 10% than the natural color natural latex tube, and with the increase of the inner and outer diameters, the production efficiency of the thermal extrusion method tends to decrease, and the appearance quality is de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D23/00C08J5/02C08J7/12C08L7/02C08L15/00C08L89/00C08L71/02C08L21/02C08K13/02C08K3/22C08K3/26C08K3/06
CPCB29D23/001B29K2105/0032B29K2105/0044B29K2105/005C08J5/02C08J7/12C08J2307/02C08J2315/00C08J2321/02C08J2389/00C08J2415/00C08J2471/02C08J2489/00C08K3/06C08K13/02C08K2003/2296C08K2003/265C08K2201/003
Inventor 李志锋
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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