CN108049168A - A kind of flaxen fiber of formaldehydeless and acetaldehyde release and preparation method thereof - Google Patents

Abstract

The invention discloses a formaldehyde-free and acetaldehyde-free hemp fiber and a preparation method thereof, belonging to the field of fiber modification treatment. Formaldehyde-free and acetaldehyde-free hemp fibers are sprayed with adsorbent on the unpacked hemp fibers, and after drying and negative pressure treatment, a kind of formaldehyde-free and acetaldehyde-free hemp fibers are obtained, which are used to prepare hemp fiber reinforced polymerization Reinforcing base for matrix composites. Described hemp fiber is natural fiber such as jute, flax, sisal hemp, hemp, ramie. The hemp fiber prepared by the invention is environmentally friendly, free from formaldehyde and acetaldehyde release. It can be widely used in the fields of natural fiber-reinforced polymer-based composite materials, building reinforcement materials, etc., has good application prospects, and is a low-cost, environment-friendly natural fiber preparation process.

Description

A kind of hemp fiber without release of formaldehyde and acetaldehyde and preparation method thereof

technical field

The invention belongs to the field of fiber modification treatment.

Background technique

With the progress of society, people's demand for environmental protection, energy saving and material saving is constantly increasing, and the requirements for materials for automobiles and automobile interior parts are also getting higher and higher, and the market competition is fierce. The problem of VOC (volatile organic compounds) is a problem that must be solved for automotive interior materials. It is difficult to completely remove formaldehyde and acetaldehyde in hemp fiber composite materials by traditional treatment methods. The produced hemp fiber composite materials are still difficult to meet the requirements of automobile interior Strict requirements for VOC release in national regulations for trim parts. Therefore, a low-cost process method that can completely remove formaldehyde and acetaldehyde in the hemp fiber is a difficult problem to be solved urgently in the development of the automotive interior material industry.

Contents of the invention

In order to solve the problem that the VOC release in the existing hemp fiber composite material cannot meet the requirements of national regulations, the present invention proposes a hemp fiber without formaldehyde and acetaldehyde release, wherein the hemp fiber 1 forms a hemp fiber group with a size of 5-10mm The voids between the hemp fibers are filled with adsorbent particles 2, and the fiber bundles of the hemp fibers 1 and the adsorbent particles 2 are adhered to each other.

The preparation method of the hemp fiber that described formaldehyde-free and acetaldehyde releases, concrete steps are as follows:

1) Unpack the hemp fiber bag using a bag unpacking machine, so that the hemp fiber forms a hemp fiber group with a size of 5 to 10 mm;

2) Spray the above-mentioned hemp fiber group through the adsorbent solution, so that the hemp fiber group can fully infiltrate the adsorbent solution to a saturated state;

3) Ventilate and exhaust the infiltrated hemp fiber mass;

4) transfer the soaked and saturated hemp fiber mass into a closed container for negative pressure treatment, the vacuum degree is 1-10kPa; obtain the hemp fiber free from formaldehyde and acetaldehyde release.

Wherein, the adsorbent is nano clay modified by silane coupling agent. Hemp fiber can select the fiber of jute, flax, sisal hemp, hemp or ramie for use.

Adsorbent suspension configuration method: add 0.5-2wt% nanoclay, 0.25-1wt% dispersant, and 1-2wt% silane coupling agent to water to form a concentration of 10-30wt% of the total mass of the hemp fiber % of nanoclay-coupling agent suspension; stirring the nanoclay-coupling agent suspension at a speed of 1000-1350rpm for 0.5-2h; stirring the nanoclay-coupling agent suspension at a speed of 1700-2000rpm Stir for 1.5-3h to form a nanoclay coupling agent mixture.

Beneficial effects of the present invention:

The hemp fiber treated by the method of the invention has good environmental performance, no formaldehyde and acetaldehyde release, and wide application. It can be widely used in natural fiber-reinforced polymer-based composite materials, building reinforcement materials and other fields, has good application prospects, and is a low-cost, environmentally friendly natural fiber treatment process.

Description of drawings

Fig. 1 Schematic diagram of the hemp fiber structure without formaldehyde and acetaldehyde release.

Detailed ways

The technical solution of the present invention will be further explained and illustrated below in the manner of specific embodiments.

Embodiment 1 (jute fiber)

1) the jute fiber bag is unpacked using a bale opener, so that the hemp fiber forms a hemp fiber group that is 5mm in size;

2) Spray the above-mentioned hemp fiber group through the adsorbent solution, so that the hemp fiber group can fully infiltrate the adsorbent solution to a saturated state;

3) Ventilate and exhaust the infiltrated hemp fiber mass;

4) transfer the soaked and saturated hemp fiber group into a closed container for negative pressure treatment, the vacuum degree is 5kPa; obtain the hemp fiber without formaldehyde and acetaldehyde release.

Wherein, the configuration method of the adsorbent: take 0.5wt% nano-montmorillonite of the total mass of mixed fibers, 0.25wt% polyvinylpyrrolidone as a dispersant, and add 1wt% silane coupling agent into water to make a suspension with a concentration of 20wt% , Stir at 1350rpm with a mechanical stirrer for 1h, then stir at 1700rpm for 2h to prepare a uniformly dispersed nanoclay suspension.

Adopt bag type VOC testing method to measure, the VOC release amount of the hemp fiber that the present invention makes is that formaldehyde is 0.05mg/kg, and acetaldehyde is 0.04mg/kg, and TVOC is 2Cμg/g.

Embodiment 2 [hemp (or claim hemp) fiber]

1) unpack the hemp fiber bag using a bag unpacking machine, so that the hemp fiber forms a hemp fiber group with a size of 8mm;

2) Spray the above-mentioned hemp fiber group through the adsorbent solution, so that the hemp fiber group can fully infiltrate the adsorbent solution to a saturated state;

3) Ventilate and exhaust the infiltrated hemp fiber mass;

4) Transfer the soaked and saturated hemp fiber group to a closed container for negative pressure treatment, the vacuum degree is 3kPa; obtain hemp fiber without formaldehyde and acetaldehyde release.

Among them, the configuration method of the adsorbent: take 1wt% nano-montmorillonite of the total mass of the mixed fiber, 0.25wt% polyvinylpyrrolidone as a dispersant, and add 1.5wt% silane coupling agent into water to make a suspension with a concentration of 20wt%. The solution was first stirred with a mechanical stirrer at 1350rpm for 1h, and then stirred at 1700rpm for 2h to prepare a uniformly dispersed nanoclay suspension.

Adopt bag method VOC testing method to measure, the VOC release amount of the hemp fiber that the present invention makes is 0.03mg/kg formaldehyde, and acetaldehyde is 0.05mg/kg, and TVOC is 3C μ g/g.

Embodiment 3 (flax fiber)

1) unpack the flax fiber bag using a bale opener, so that the hemp fiber forms a hemp fiber group with a size of 10mm;

2) Spray the above-mentioned hemp fiber group through the adsorbent solution, so that the hemp fiber group can fully infiltrate the adsorbent solution to a saturated state;

3) Ventilate and exhaust the infiltrated hemp fiber mass;

4) transfer the soaked and saturated hemp fiber group into a closed container for negative pressure treatment, and the vacuum degree is 10kPa; obtain hemp fiber without formaldehyde and acetaldehyde release.

Wherein, the configuration method of the adsorbent: take 2wt% nano-montmorillonite of the total mass of the mixed fiber, 1wt% polyvinylpyrrolidone as a dispersant, and add 2wt% silane coupling agent into water to make a suspension with a concentration of 20wt%, Stir with a mechanical stirrer at 1350 rpm for 1 h, then at 1700 rpm for 2 h to prepare a uniformly dispersed nanoclay suspension.

Adopt the bag type VOC test method to measure, the VOC release amount of the hemp fiber that the present invention makes is 0.06mg/kg formaldehyde, and acetaldehyde is 0.02mg/kg, and TVOC is 1Cμg/g.

The structure of the hemp fiber prepared by the above method is shown in Figure 1. The gap between the hemp fibers in the hemp fiber group with a size of 5-10 mm formed by the hemp fiber 1 is filled with adsorbent particles 2, and the fibers of the hemp fiber 1 The bundles and the sorbent particles 2 stick to each other.

Claims (6)

1. a kind of flaxen fiber of formaldehydeless and acetaldehyde release, which is characterized in that the size that flaxen fiber (1) is wound for 5~ Absorbent particles (2), and the fibre bundle of flaxen fiber (1) and absorption are filled in gap in 10mm flaxen fibers group between flaxen fiber Agent particle (2) is inter-adhesive；The adsorbent is silane coupler modified nano clay；Flaxen fiber is jute, flax, sword Fiber crops, hemp or ramie harl.

2. a kind of preparation method of the flaxen fiber of formaldehydeless and acetaldehyde release as described in claim 1, is as follows：

1) flaxen fiber bag is opened into bag using bale opener, flaxen fiber is made to form the flaxen fiber group that size is 5~10mm；

2) above-mentioned flaxen fiber is rolled into a ball and is sprayed through adsorbent solution, flaxen fiber group is enable fully to infiltrate adsorbent solution to saturation shape State；

3) the flaxen fiber group for infiltrating saturation is aerated gas exhaust treatment；

4) flaxen fiber for infiltrating saturation is rolled into a ball and Negative pressure is carried out in transfer closed container, vacuum degree is 1~10kPa；Obtain nothing Formaldehyde and the flaxen fiber of acetaldehyde release；

Wherein, the adsorbent is silane coupler modified nano clay；Flaxen fiber is jute, flax, sisal hemp, hemp or ramie Harl.

3. the preparation method of the flaxen fiber of according to claim 2 formaldehydeless and acetaldehyde release, which is characterized in that the suction Attached dose of suspension configures in accordance with the following steps：By nanoclay, the 0.25-1wt% of the 0.5-2wt% of the flaxen fiber gross mass Dispersant, the silane coupling agent of 1-2wt% be added to the water, form the nanoclay-coupling agent that concentration is 10-30wt% and suspend Liquid；The nanoclay-coupling agent suspension is stirred into 0.5-2h under 1000-1350rpm rotating speeds；By the nanoclay- Coupling agent suspension stirs 1.5-3h under 1700-2000rpm rotating speeds, forms the coupling agent mixed liquor of nanoclay.

4. the preparation method of the flaxen fiber of according to claim 3 formaldehydeless and acetaldehyde release, which is characterized in that take mixing The 0.5wt% nano imvites of total fiber mass, for 0.25wt% polyvinylpyrrolidones as dispersant, 1wt% is silane coupled Agent is added to the water, and concentration 20wt% suspension is made, and first 1h is stirred under 1350rpm with mechanical agitator, then in 1700rpm 2h is stirred, prepares homodisperse nanoclay suspension.

5. the preparation method of the flaxen fiber of according to claim 3 formaldehydeless and acetaldehyde release, which is characterized in that take mixing The 1wt% nano imvites of total fiber mass, for 0.25wt% polyvinylpyrrolidones as dispersant, 1.5wt% is silane coupled Agent is added to the water, and the suspension of concentration 20wt% is made, and first stirs 1h under 1350rpm with mechanical agitator, then exists 1700rpm stirs 2h, prepares homodisperse nanoclay suspension.

6. the preparation method of the flaxen fiber of according to claim 3 formaldehydeless and acetaldehyde release, which is characterized in that take mixing The 2wt% nano imvites of total fiber mass, 1wt% polyvinylpyrrolidones are added in as dispersant, 2wt% silane coupling agents In water, the suspension of concentration 20wt% is made, 1h is first stirred under 1350rpm with mechanical agitator, is then stirred in 1700rpm 2h prepares homodisperse nanoclay suspension.