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A kind of preparation method of natural latex tube

A technology for natural latex and latex tubes, applied in the field of natural latex tubes, can solve the problems of reduced production efficiency of thermal extrusion method, increased appearance quality defects, difficulty in meeting market demands, etc., and achieves good diameter consistency and improved tensile strength. , the effect of increasing the constant elongation value

Active Publication Date: 2021-01-05
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 for preparing natural latex tubes has been used since 1930, but the production of large-scale natural latex tubes with an inner diameter ≥ 6mm and an outer diameter ≥ 12mm, as the inner and outer diameters increase, the production efficiency of the heat-sensitive extrusion method will decrease. It shows a downward trend, and the appearance quality defects show an increasing trend, and thick-walled natural latex tubes with a tube wall thickness ≥ 5.5mm, such as 7mm×18mm, are difficult to prepare by thermal extrusion
Large-scale or thick-walled natural latex tubes with excellent elasticity and stretching ratio, and excellent 300% constant elongation performance, are more suitable for the assembly and use of strength training fitness equipment. The market demand is large, but the traditional The thermal extrusion method is difficult to meet the market demand

Method used

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  • A kind of preparation method of natural latex tube
  • A kind of preparation method of natural latex tube
  • A kind of preparation method of natural latex tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Preparation of large-scale natural latex tubes of 6 mm × 13 mm by cyclic dipping method

[0064] Step 1: prepare the mixed dispersion that solid content is 50wt% by following weight ratio:

[0065]

[0066] The above materials were put into a ball mill with a rotating speed of 80rpm to grind for 60h, and filtered with a stainless steel screen with a pore size of 0.28mm.

[0067] Step 2: prepare the vulcanized latex that solid content is 55wt% by following weight ratio:

[0068]

[0069]

[0070] Stir the concentrated latex in the latex vulcanization tank and add the stabilizer, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 40°C, then add 45wt% MG49 Tianjia latex, 28wt% epoxidized natural latex and 50wt% aqueous calcium carbonate The mixture, 50wt% mixed dispersion and water were heated to 55°C and then kept warm for 88 minutes. After the chloroform value of the vulcanized latex reached the end, it w...

Embodiment 2

[0081] Preparation of large-scale natural latex tubes of 7 mm × 15 mm by cyclic dipping method

[0082] Step 1: prepare the mixed dispersion that solid content is 50wt% by following weight ratio:

[0083]

[0084] The above materials were put into a ball mill with a rotating speed of 80rpm to grind for 60h, and filtered with a stainless steel screen with a pore size of 0.28mm.

[0085] Step 2: prepare the vulcanized latex that solid content is 55wt% by following weight ratio:

[0086]

[0087] Stir the concentrated latex in the latex vulcanization tank and add the stabilizer, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 40°C, then add 45wt% MG49 Tianjia latex, 28wt% epoxidized natural latex and 50wt% aqueous calcium carbonate The mixture, 50wt% mixed dispersion and water were heated to 56°C and kept warm for 83 minutes. After the chloroform value of the vulcanized latex reached the end, it was cooled to room...

Embodiment 3

[0098] Preparation of large-scale natural latex tubes of 7 mm × 16 mm by cyclic dipping method

[0099] Step 1: prepare the mixed dispersion that solid content is 50wt% by following weight ratio:

[0100]

[0101] The above materials were put into a ball mill with a rotating speed of 80rpm to grind for 60h, and filtered with a stainless steel screen with a pore size of 0.28mm.

[0102] Step 2: prepare the vulcanized latex that solid content is 55wt% by following weight ratio:

[0103]

[0104]

[0105] Stir the concentrated latex in the latex vulcanization tank and add stabilizer, pass hot water into the interlayer of the latex vulcanization tank to raise the temperature of the latex to 38°C, then add 45wt% MG49 Tianjia latex, 28wt% epoxidized natural latex and 50wt% aqueous calcium carbonate The mixture, 50wt% mixed dispersion and water were heated to 57°C and kept warm for 79 minutes. After the chloroform value of the vulcanized latex reached tertiary, it was coole...

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Abstract

The invention discloses a preparing method of a natural latex pipe. The preparing method adopts a circular impregnation method and comprises the following steps of firstly, mixed dispersion preparing;secondly, vulcanized latex preparing; thirdly, heat-sensitive latex preparing; fourthly, pulling a silicone mold core to a latex pipe circular impregnating machine to impregnate heat-sensitive latex;fifthly, demolding, leaching and predrying; and sixthly, surface treatment and final drying, and obtaining the circular impregnating natural latex pipe. A circular impregnating method is applied, thelarge-specification natural latex pipe with the inner diameter being larger than or equal to 6 mm and the outer diameter being larger than or equal to 12 mm is prepared, compared with a traditional hot-sensitive pressing-out method, the production efficiency is improved by more than 13 times, the quality level is stable, through increasing the impregnating frequency, the natural latex pipe whichis difficultly prepared by the traditional hot-sensitive pressing-out method and has the pipe wall thickness being larger than or equal to 5.5 mm can be prepared, the quality level is stable, the method is high in maneuverability, and industrialized production is achieved.

Description

technical field [0001] The invention belongs to the technical field of natural latex tubes, and in particular relates to a preparation method of natural latex tubes. Background technique [0002] Natural latex tubes are used for medical aids, connection of experimental instruments and assembly of fitness equipment, etc. The specifications are represented by inner diameter (mm) × outer diameter (mm), the inner diameter ranges from 1.5 to 9mm, and the outer diameter ranges from 3 to 20mm. The traditional heat-sensitive extrusion method for preparing natural latex tubes has been used since 1930, but the production of large-scale natural latex tubes with an inner diameter ≥ 6mm and an outer diameter ≥ 12mm, with the increase of the inner and outer diameters, the production efficiency of the heat-sensitive extrusion method will decrease. It shows a decreasing trend, and the appearance quality defects show an increasing trend. However, thick-walled natural latex tubes with a tube ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C41/02B29C41/52B29C71/00B29C37/00C08L7/02C08L71/02C08L15/00C08L89/00C08K13/02C08K3/26C08K3/22C08K3/06C08K5/40B29L23/00
CPCB29C37/0092B29C41/025B29C41/52B29C71/0009B29L2023/22C08K2003/2296C08K2003/265C08L7/02C08L2203/18C08L2205/025C08L2205/035C08L71/02C08L15/00C08L89/005C08K13/02C08K3/26C08K3/22C08K3/06C08K5/40
Inventor 李志锋
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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