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Preparation method for modified reinforced hemp fiber

A hemp fiber and enhanced technology, which is applied in the field of preparation of modified enhanced hemp fiber, can solve problems such as shaving, long hairiness on the surface of the fabric, and poor interface compatibility, so as to increase the bonding strength, eliminate formaldehyde release, and improve phase. capacitive effect

Active Publication Date: 2018-05-18
JIANGYIN YANLI AUTOMOBILE DECORATIVE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the hemp fiber in the existing hemp fiber composite board has not been modified and strengthened. The hemp fiber contains a large number of hydroxyl groups and is a hydrophilic polar material, while polypropylene is a hydrophobic non-polar material and is essentially hydrophilic. Water-based plant hemp fiber and hydrophobic polypropylene are incompatible, and the interfacial compatibility between untreated hemp fiber and resin matrix is ​​extremely poor
The hemp fiber composite board produced by the prior art has outstanding hemp rigidity, poor cohesion between fibers, long hairiness on the surface of the fabric, and low binding force between hemp fiber and polypropylene fiber (polymer PP fiber). Weakened the mechanical strength of hemp fiber composite board
[0004] In addition, hemp fiber contains lignin, pectin, waxy substances, and nitrogen-containing substances. After being made into hemp fiber composite board, these substances will chemically react with oxygen, and will emit harmful substances such as aldehydes and benzenes very slowly. , therefore, the environmental protection performance of the hemp fiber composite board produced by the existing technology is not ideal enough

Method used

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  • Preparation method for modified reinforced hemp fiber
  • Preparation method for modified reinforced hemp fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 Shown is the embodiment of the preparation method of a kind of modified reinforced hemp fiber of the present invention, comprises following processing step:

[0029] Step 1, washing treatment of hemp fiber;

[0030] Step 2, drying the hemp fiber after washing;

[0031] Step 3. Preparation of working fluid: use water as base fluid and JFC penetrant as additive to prepare penetrant working fluid;

[0032] Step 4, pre-moisten the hemp fiber with warm water;

[0033] Step 5, put the hemp fiber into the working solution for insulation and impregnation;

[0034] Step 6, wash with warm water;

[0035] Step 7, wash in cold water;

[0036] Step 8, drying treatment.

[0037] In this embodiment, the ratio of the penetrant working solution is: 0.8-1 g of JFC penetrant is added per liter of water.

[0038] In the step 5 of the present embodiment, the fixed bath ratio of putting the hemp fiber into the working solution for heat preservation and soaking is 1:50...

Embodiment 2

[0044] Get the modified reinforced hemp fiber that embodiment 1 makes, carry out the test of harmful substances with reference to Fiat Automobile Company CS-A0229 standard. Simultaneously take the hemp fiber manufactured by the conventional process as a comparison. The bag size is 100L, and the sampling size is 500c㎡. Wherein, the hemp fiber produced by the conventional process is not modified and strengthened.

[0045] The measured data of hazardous substances are as follows:

[0046]

Embodiment 3

[0048] The modified reinforced hemp fiber obtained in Example 1 was used as a raw material to prepare a hemp fiber composite board, and the density test and strength test were carried out. At the same time, the hemp fiber composite board prepared by taking the unmodified and reinforced hemp fiber as the raw material was used as a comparison.

[0049] In the above two hemp fiber composite boards, the ratio of hemp fiber to polymer PP fiber is the same, which is 50% hemp fiber + 50% polymer PP fiber.

[0050] The density data of the measured hemp fiber composite board is as follows:

[0051]

Composite panels made from unmodified hemp fibers

Composite board made of modified hemp fiber

density

0.54g / cm 3

0.38g / cm 3

[0052] The measured tensile strength and bending strength data are compared as follows:

[0053]

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Abstract

The invention discloses a preparation method for modified reinforced hemp fibers, belonging to the technical field of hemp fiber preparation. The preparation method comprises the following process steps: step 1, water processing of hemp fibers; step 2, drying treatment of the washed hemp fibers; steps 3, preparation of a working solution: with water as a base solution and a JFC penetrant as an additive, preparing the penetrant working solution; step 4, pre-wetting of the hemp fibers with warm water; step 5, heat-preserved impregnation of the hemp fibers in the working solution; step 6, washingwith warm water; step 7, washing with cold water; and step 8, drying. The preparation method can effectively reduce harmful substances such as aldehydes and benzenes in the hemp fibers, so the modified reinforced hemp fibers prepared in the invention has good environmental protection performance; and a hemp fiber composite board made of the modified reinforced hemp fibers is high in the bonding strength of the hemp fibers and PPs and can maintain high strength under the condition of low density, so the hemp fiber composite board is allowed to have light weight.

Description

technical field [0001] The invention relates to the technical field of hemp fiber preparation, in particular to a preparation method of modified reinforced hemp fiber. Background technique [0002] Plant hemp fiber has the characteristics of low cost, light weight, natural degradation, high specific strength and specific modulus, and is widely used in the preparation of fiber composite reinforcement materials. For example, in the automotive industry, hemp fiber composite panels have been developed to replace widely used synthetic reinforced fiber panels such as glass fiber panels. For example, the hemp fiber composite board made of hemp fiber and polymer PP fiber has been well applied in the interior materials of automobiles. [0003] However, the hemp fiber in the existing hemp fiber composite board has not been modified and strengthened. The hemp fiber contains a large number of hydroxyl groups and is a hydrophilic polar material, while polypropylene is a hydrophobic non-...

Claims

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Application Information

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IPC IPC(8): D06M15/53C08L23/12C08L1/02D06M101/06
CPCC08L1/02C08L23/12D06M15/53D06M2101/06
Inventor 徐松庄理少
Owner JIANGYIN YANLI AUTOMOBILE DECORATIVE PARTS
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